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Watertown Final SWMP with Appendices - 6.27.19
Weston ®Sampson westonandsampson.com 55 Walkers Brook Drive STORMWATER Reading, MA 01867 tel: 978.532.1900 ...................................................................................................................................................................... MANAr--""EMENT ................................................................................... PIAN MS4 GENERAL PERMIT COMPLIANCE JUNE 2019 TOWN OF Watertown MASSACHUSETTS ..... = ...................... R. STORMWATER MANAGEMENT PLAN TABLE OF CONTENTS TABLE OF CONTENTS Page LISTOF TABLES....................................................................................................................................iii LIST OF APPENDICES......................................................................................................................... iv CERTIFICATION..................................................................................................................................... v 1.0 INTRODUCTION / OVERVIEW....................................................................................1-1 1.1 Regulatory Summary and Purpose...........................................................................1-1 1.2 Town Governance and Structure..............................................................................1-2 1.3 Stormwater Advisory Committee..............................................................................1-3 1.4 Town Demographic Information................................................................................1-3 1.5 Water Resources......................................................................................................1-4 1.6 Interconnections.......................................................................................................1-5 1.7 Endangered Species and Historic Properties Determination.....................................1-7 1.8 Increased Discharges...............................................................................................1-8 1.9 Surface Water Drinking Supplies..............................................................................1-9 2.0 MINIMUM CONTROL MEASURES..............................................................................2-1 2.1 Introduction..............................................................................................................2-1 2.2 Permit Requirements and Implementation Timeframes............................................2-1 2.2.1 Public Education and Outreach............................................................................2-1 2.2.2 Public Involvement / Participation.........................................................................2-5 2.2.3 Illicit Discharge Detection and Elimination............................................................2-9 2.2.4 Construction Site Stormwater Runoff Control.....................................................2-12 2.2.5 Post -Construction Stormwater Management......................................................2-14 2.2.6 Pollution Prevention / Good Housekeeping.........................................................2-16 3.0 REGULATORY STANDARDS......................................................................................3-1 3.1 Introduction..............................................................................................................3-1 3.2 Existing Stormwater Regulatory Mechanisms...........................................................3-1 3.2.1 Prohibition of Illicit Discharges to the Storm Drain System....................................3-1 3.2.2 Stormwater Management and Erosion Control Ordinance....................................3-2 3.2.3 Rules and Regulations for Stormwater Management and Erosion Control ............ 3-2 3.3 Review of Regulatory Mechanisms for Compliance with the 2016 MS4 Permit ......... 3-2 3.3.1 Construction Site Stormwater Runoff Control.......................................................3-2 3.3.2 Post -Construction Stormwater Management........................................................3-6 4.0 IDDE MONITORING AND PROGRESS.......................................................................4-1 4.1 IDDE Plan................................................................................................................4-1 4.1.1 Mapping...............................................................................................................4-2 4.1.2 Sampling and Analysis.........................................................................................4-2 4.1.3 Field Investigation.................................................................................................4-3 4.1.4 Sanitary Sewer Overflows....................................................................................4-3 ...................................................................................................................................................................I Weston ® Sampson westonandsampson.com i STORMWATER MANAGEMENT PLAN 5.0 STANDARD OPERATING PROCEDURES..................................................................5-1 5.1 MS4 Permit Requirement.........................................................................................5-1 5.2 Inventory of Municipal Facilities................................................................................5-1 5.3 Operation and Maintenance Procedures for Municipal Activities and Facilities ......... 5-1 5.4 Catch Basin Cleaning and Optimization...................................................................5-1 6.0 TMDLS AND WATER QUALITY LIMITED WATERS....................................................6-1 6.1 Discharges to Water Quality Limited Waters............................................................6-1 6.2 Bacteria/Pathogens Impairments..............................................................................6-1 6.2.1 Public Education and Outreach............................................................................6-2 6.3 Phosphorus Impairments..........................................................................................6-2 6.3.1 Phosphorus Control Plan......................................................................................6-3 6.3.2 Phase 1................................................................................................................6-3 6.3.3 Phase 2................................................................................................................6-5 6.3.4 Phase 3................................................................................................................6-6 6.4 Oil and Grease, TSS and Turbidity Impairments.......................................................6-8 7.0 REPORTING, EVALUATION AND MODIFICATION....................................................7-1 7.1 MS4 Permit Reporting..............................................................................................7-1 7.2 Evaluation of SWMP Success..................................................................................7-1 7.3 Modifications to the SWMP or Notice of Intent..........................................................7-2 ................................................................................................................................................................... . Weston ® Sampson westonandsampson.com II STORMWATER MANAGEMENT PLAN LIST OF TABLES Table 1.1 — Parties Responsible for SWMP Implementation.................................................. Page 1-3 Table 1.2 — Receiving Waters and Impairments...................................................................... Page 1-5 Table 1.3 — Interconnections and Impairments....................................................................... Page 1-6 Table 6.1 — Phosphorus Control Plan Phase 1 Components ................................................. Page 6-3 Table 6.2 — Phosphorus Control Plan Phase 2 Components ................................................. Page 6-5 Table 6.3— Phosphorus Control Plan Phase 3 Components .................................................. Page 6-7 ................................................................................................................................................................... . Weston ® Sampson westonandsampson.com III STORMWATER MANAGEMENT PLAN LIST OF APPENDICES Appendix A............................................................................................... Definitions and Abbreviations AppendixB............................................................................................................ Regulated Area Map AppendixC.................................................................................................................. 2016 MS4 Permit Appendix D................................................................................................... 2016 MS4 Notice of Intent .......................................................................................................................Authorization to Discharge Appendix E.......................................................................2003 MS4 Permit Annual Reports Reference Appendix F.............................................................................................MS4 Checklists by Permit Year Appendix G.................................................................................................. Public Education Materials Appendix H...................................................................................................... Regulatory Mechanisms Appendix I........................................................................................... Standard Operating Procedures Appendix J.................................................................................................... 2016 MS4 Annual Reports ............................................................................................................................................................... Weston n Sampson westonandsampson.com IV STORMWATER MANAGEMENT PLAN CERTIFICATION "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." Printed Name %`%i l hGf P/ 'T Signature Date .................................................................................................................................................................... Weston®Sampson westonandsampson.com V STORMWATER MANAGEMENT PLAN 1.0 INTRODUCTION / OVERVIEW 1.1 Regulatory Summary and Purpose The Federal Water Pollution Control Act (WPCA), initially enacted in 1948, established ambient water quality standards to specify acceptable levels of pollution in lieu of preventing the causes of water pollution. The 1972 amendments to the WPCA, referred to as the Clean Water Act (CWA), implemented measures which were focused on establishing effluent limitations on point sources, or 'any discernable, confined, and discrete conveyance... from which pollutants are or may be discharged." The 1972 CWA introduced the National Pollutant Discharge Elimination System (NPDES). The NPDES program was established as the fundamental regulatory mechanism of the CWA, requiring direct dischargers of pollutants into waters of the United States to obtain a NPDES permit. Between 1972 and 1987, the NPDES permit program focused on improving surface water quality by reducing pollutants of industrial process wastewater and municipal sewage. During this period, several nationwide studies on water quality, most notably the United States Environmental Protection Agency (EPA) National Urban Runoff Plan (NURP), identified stormwater discharges as a significant source of water pollution. The results of the NURP and similar studies, resulted in the reauthorization of the CWA in 1987 with the passage of the Water Quality Act (WQA). The WQA established a legal framework and required EPA to develop a comprehensive phased program for regulating municipal and industrial stormwater discharges under the NPDES permit program. The NPDES Phase 1 Rule, which was issued in November 1990, addressed stormwater dischargers from medium to large municipal separate storm sewer systems (MS4s), which were communities serving a population of at least 100,000 people, as well as stormwater discharges from 11 categories of industrial activity. The NPDES Phase 2 Rule, which was promulgated in December 1999, addressed small MS4s serving a population of less than 100,000 people in urbanized areas. The Phase 2 Rule requires nationwide coverage of all operators of small MS4s that are located within the boundaries of the Bureau of the Census -defined "urbanized area" (UA) based on the latest decennial census. The Phase 2 rule requires that all MS4s located within "urbanized areas" automatically comply with the Phase 2 stormwater regulations. Appendix B of this report provides a map of the Phase II stormwater "permit compliance area" for Watertown as determined by the USEPA using the latest decennial (year 2010) census. Since Watertown is located within an urbanized area, the EPA has designated the Town of Watertown as a Phase 2 Community, which must comply with the NPDES regulations. In the Commonwealth of Massachusetts, the EPA retains primacy as the Phase 2 permitting authority. On May 1, 2003, the EPA and the Massachusetts Department of Environmental Protection (MADEP) jointly issued the NPDES General Permit for Discharges from Small MS4s and in July 2003, Watertown submitted the required Notice of Intent (NOI) for inclusion under this General Permit. The 2003 NPDES Phase 2 MS4 General Permit (2003 MS4 Permit) required the Town of Watertown to develop, implement, and enforce a Stormwater Management Program (SWMP). The objectives of the westonandsampson.com 1-1 Weston ®Sampson STORMWATER MANAGEMENT PLAN SWMP were to reduce the discharge of pollutants from the MS4 to the maximum extent practicable, to protect water quality, and to satisfy the appropriate water quality requirements of the CWA. This Stormwater Management Plan will specifically satisfy the requirements set forth by the NPDES Phase 2 regulations which expanded Phase 1's efforts to preserve, protect, and improve the nation's water resources from polluted stormwater runoff to include additional operators of "traditional" (i.e. cities and towns) and "non-traditional" (i.e. Federal and state agencies) MS4s. The 2003 MS4 Permit expired on May 1, 2008, but was administratively continued for covered permittees until a new MS4 Permit was issued on April 4t", 2016, and became effective on July 1, 2018. A copy of the 2016 MS4 Permit is included in Appendix C. On October 1, 2018, the Town submitted a Notice of Intent to EPA to obtain coverage under the 2016 MS4 Permit. A copy of this Notice of Intent is included in Appendix D. EPA posted the Town's Notice of Intent for public comment on April 1, 2019 for a 30-day period. The Town received authorization from EPA to discharge under the 2016 MS4 Permit on May 30, 2019. A copy of the Town's Authorization to Discharge is included in Appendix D. Since the Town of Watertown was previously covered under the 2003 Small MS4 General Permit, the Town currently has many practices and programs in place related to stormwater management and pollution prevention. This plan coordinates and incorporates these programs, policies, guidelines and practices into one document and expands their reach to encompass the requirements and goals of the 2016 MS4 Permit. The objectives of the MS4 Permit are accomplished through the implementation of Best Management Practices (BMPs) for each of the following six minimum control measures. • Public education and outreach • Public involvement / participation • Illicit discharge detection and elimination • Construction site stormwater runoff control • Post -construction stormwater management in new development or redevelopment • Pollution prevention/good housekeeping The Town's efforts to comply with these BMPs, as outlined in their Notice of Intent, are included in Section 2.0. 1.2 Town Governance and Structure The Town of Watertown has a Town Council form of government. Watertown is one of a small number of municipalities in Massachusetts that retains the title of town, but functions as a city under state law. The legislative power of the Town is vested in a Town Council and the Town Manager who answers to the council. The present-day duties of the Manager include proper administration of all town affairs. The Public Works Director is responsible for maintaining town roads, facilities and infrastructure. Various entities within the Town have the responsibility for implementation of the MS4 Permit requirements as outlined in this plan and include the following: • Department of Public Works • Department of Community Development and Planning westonandsampson.com .,, -2 Weston ®Sampson STORMWATER MANAGEMENT PLAN • Health Department • Stormwater Advisory Committee Specific representatives from each of these departments or committees that are responsible for implementation of the SWMP are outlined in the table below: Matthew Shuman, PE Town Engineer Engineering Division, DPW Gerald Mee Public Works Superintendent Jay Pelletier Assistant Superintendent Ed Baptista Highway Supervisor Steve Magoon Director Larry Ramdin Director of Public Health David Stokes Chair 1.3 Stormwater Advisory Committee -TT Utilities, DPW Highway Division, DPW Community Development and Planning Board of Health Stormwater Advisory Committee The Town of Watertown has established a Stormwater Advisory Committee (SAC) to act as an advisory body to the Superintendent of Public Works. It consists of seven (7) members, three (3) town of Watertown employees and four (4) citizens, three (3) of which are appointed by the Town Manager and confirmed by the Town Council, and one (1) appointed by the Town Council President. The Committee is tasked with developing educational programs to increase the public's awareness of relevant stormwater management techniques, identify funding sources for stormwater efforts, review stormwater ordinances, make periodic progress reports to the Town Council, and perform other tasks relevant to stormwater management. The Stormwater Committee meets monthly at the Department of Public Works. The public is welcome and encouraged to attend meetings. The meetings and agendas are posted in accordance with the State Opening Meeting Law. 1.4 Town Demographic Information Watertown is located in Middlesex County and has a total area of 4.2 square miles (11 square kilometers). It is bordered by Belmont to the north, Cambridge to the northeast, Waltham to the west, Newton to the southwest and Boston to the southeast. As of 2016, the population was 35,025 and is comprised of six neighborhoods: Bemis, Brigham, Coolidge Square, East Watertown, Watertown Square, and the West End. .................................................................................................................................................................... westonandsampson.com 1-3 Weston ®Sampson STORMWATER MANAGEMENT PLAN Territory comprised of densely settled tracts and adjacent urban developed areas that meet the minimum population requirements set forth by the EPA, according to the 2000 and 2010 census data, shall be referred to as urbanized area. Rural land uses and sparsely populated tracts shall be categorized as non -regulated for the purposes of the MS4 permit. Watertown is entirely comprised of urbanized area (UA) as shown in the regulated area map in Appendix B and only 1.2% of the Town is water. Principal highways located within the boundaries of Watertown include Route 20, known locally as Main Street and North Beacon Street which runs east to west, and Route 16, known locally as Mt Auburn Street, which runs from south to northeast. There are approximately 4.5 miles of state - maintained roadways within town. Climate within the Town of Watertown ranges from January average minimum temperature of 29.9 degrees Fahrenheit (°F) to July average maximum temperature of 73.7°F. The average annual precipitation is 42.77 inches, distributed throughout the year. The rainiest month is November, with approximately 4.45 inches of rain. 1.5 Water Resources Most of Watertown is located within the Charles River Watershed, with a small section of the northern portion of the Town is located within the Mystic River Watershed. Aside from a few small ponds within the cemetery and golf course, the primary waterbodies are the Charles River (MA72- 07 and MA72-36) and two tributaries to the Charles River, Laundry Brook (MA72-30) and Sawins Brook (MA72-32). Laundry Brook extends from north of California Street, Watertown to the Charles River. Sawins Brook extends east of Elm Street and flows approximately 0.5 miles to the Charles River. Some sections of the brook are culverted. These water bodies are impaired for a number of factors according to the Final 2014 303(d) list of Impaired Waters. All of the Town's outfalls discharge to the Charles River, with the exception of one outfall that discharges directly to Sawins Brook, and one interconnection with Belmont which discharges to the Mystic River. All impairments and outfalls discharging to these water bodies are summarized in Table 1.2. westonandsampson.com .,, 1-4 Weston ®Sampson STORMWATER MANAGEMENT PLAN Chestnut Street, r.. .� ...,.......,...—....... , Eurasian Water Milfoil, Myriophyllum Needham to spicatum, Fish Passage Barrier, Non - Watertown Dam, Native Aquatic Plants, Other Flow Regime 12 Watertown (MA72-07) Alterations, DDT, Fishes Bioassessments, Nutrient/Eutrophication Biological (Class B Water) Indicators*, PCB in Fish Tissue Chlorophyll -a*, Phosphorus (Total)*, Charles River — Escherichia coli*, Oil and Grease, Watertown Dam, Dissolved Oxygen, Secchi Disk Watertown to Boston Transparency*, Fish Passage Barrier, Non - University Bridge, Native Aquatic Plants, Other Flow Regime Boston/Cambridge Alterations, DDT, Fishes Bioassessments, 20 (MA72-36) Harmful Algal Bloom, Nutrient/Eutrophication Biological (Class B Water) Indicators*, Other (Unspecified Metals), PCB in Fish Tissue, High pH, Sediment Bioassays - Acute Toxicity Freshwater Sawins Brook (MA72- E. Coli* 1 32) Phosphorus (Total)*, Turbidity/Total Laundry Brook (MA72- Suspended Solids, E. Coli*, 30) Enterococcus*, 0 Physical Substrate Habitat Alterations, Taste and odor Note: Impairments which (*) have an approved TMDL. Applicable TMDLs are identified in Section 6.0. 1.6 Interconnections The Town of Watertown also has 5 locations where the MS4 connects with another MS4 under another municipality's jurisdiction. The catchments associated with these junction points have been delineated, and they have been labeled, sampled, and analyzed. They are included on the town -wide drainage map located at the end of this section and are summarized in Table 1.3. westonandsampson.com 1-5 Weston ®Sampson 33 BEL NEWT 109 STORMWATER MANAGEMENT PLAN Charles River - Phosphorus (Total)*, Escherichia (Chestnut Street, coli*, Eurasian Water Milfoil, Needham to Myriophyllum spicatum, Fish Discharge from Watertown Dam, Passage Barrier, Non-Native Newton to MS4 Watertown) Aquatic Plants, Other Flow Regime (MA72-07) Alterations, DDT, Fishes Bioassessments, (Class B Water) Nutrient/Eutrophication Biological Indicators*, PCB in Fish Tissue Alewife Brook - (Debris/Floatables/Trash*), (Outlet of Little Cooper, E.coli, Pond, Belmont to Foam/Flocs/Scum/Oil Slicks/PCB Discharge to confluence with in Fish Tissue, Phosphorus (Total), Belmont Mystic River, Secchi Disk Transparency, Arlington/Somerville) Sediment Bioassays - Chronic (MA71-04) Toxicity Freshwater, Taste and Odor (Class B Water) Chlorophyll -a*, Phosphorus (Total)*, Escherichia coli*, Oil and Charles River - Grease, Dissolved Oxygen, Secchi (Watertown Dam, Disk Transparency*, Fish Passage Watertown to Barrier, Non -Native Aquatic Plants, Discharge to Boston University Other Flow Regime Alterations, Newton Bridge, DDT, Fishes Bioassessments, Boston/Cambridge) Harmful Algal Bloom, (MA72-36) Nutrient/Eutrophication Biological Indicators*, Other (Unspecified (Class B Water) Metals), PCB in Fish Tissue, High pH, Sediment Bioassays - Acute Toxicity Freshwater Phosphorus (Total)*, Escherichia Charles River - coli*, Eurasian Water Milfoil, (Chestnut Street, Myriophyllum spicatum, Fish Needham to Passage Barrier, Non -Native Discharge to Watertown Dam, Aquatic Plants, Other Flow Regime Waltham Watertown) (MA72- Alterations, DDT, Fishes 07) Bioassessments, Nutrient/Eutrophication Biological (Class B Water) Indicators*, PCB in Fish Tissue westonandsampson.com 1-6 Weston ®Sampson STORMWATER MANAGEMENT PLAN Charles River — Phosphorus (Total)*, Escherichia (Chestnut Street, coli*, Eurasian Water Milfoil, Needham to Myriophyllum spicatum, Fish Discharge to Watertown Dam, Passage Barrier, Non -Native 99 Waltham Watertown) (MA72- Aquatic Plants, Other Flow Regime 07) Alterations, DDT, Fishes Bioassessments, (Class B Water) Nutrient/Eutrophication Biological Indicators*, PCB in Fish Tissue Charles River — Phosphorus (Total)*, Escherichia 1 (Chestnut Street, coli*, Eurasian Water Milfoil, (One catch basin in Needham to Myriophyllum spicatum, Fish Ridgelawn Cemetery Discharge to Watertown Dam, Passage Barrier, Non -Native connects to Waltham Watertown (MA72- Aquatic Plants, Other Flow Regime Longfellow Road in 07)) Alterations, DDT, Fishes Waltham) Bioassessments, (Class B Water) Nutrient/Eutrophication Biological Indicators*, PCB in Fish Tissue Charles River — Phosphorus (Total)*, Escherichia (Chestnut Street, coli*, Eurasian Water Milfoil, Needham to Myriophyllum spicatum, Fish Discharge from Watertown Dam, Passage Barrier, Non -Native 1 (Whitman Road) Waltham Watertown) (MA72- Aquatic Plants, Other Flow Regime 07) Alterations, DDT, Fishes Bioassessments, (Class B Water) Nutrient/Eutrophication Biological Indicators*, PCB in Fish Tissue Note: Impairments which (*) have an approved TMDL. Applicable TMDLs are identified in Section 6.0. 1.7 Endangered Species and Historic Properties Determination The 2016 MS4 Permit requires that Watertown demonstrate that all activities regulated under this permit will not adversely affect endangered and threatened species or critical habitat, or impact federal historic properties on the National Register of Historic Properties (NRHP). The Town must demonstrate that there is no critical habitat for any endangered species within its boundaries, and if such a habitat exists, that no best management practice shall interfere with that habitat. Watertown must also certify that no discharge will affect a property that is listed or eligible for listing on the NRHP, that any such effects have written acknowledgements from the State Historic Preservation Officer (SHPO), Tribal Historic Preservation Officer (THPO), or other representative that such effects shall be mitigated, and written proof that any best management practices constructed under this permit will include measures to minimize harmful effects on these properties. Through consultation with the US Fish & Wildlife Service (USFWS), it was determined that the only threatened species within Watertown is the northern long-eared bat. Correspondence with USFWS is appended to the Town's Notice of Intent included in Appendix D. Actions currently included in this westonandsampson.com -7 Weston ®Sampson STORMWATER MANAGEMENT PLAN SWMP will not affect this species. Therefore, the Town has determined that it can certify eligibility under USFWS Criterion C for coverage under the permit. Prior to construction of any structural BMPs, the Town will consult with USFWS to confirm that the proposed project will not impact the northern long- eared bat or any other endangered or threatened species that may be identified in the future. Watertown can certify eligibility under Criterion A on their Notice of Intent for coverage under the permit because the Town was previously covered under the 2003 MS4 Permit, and conditions have not changed since that determination. The Town does have multiple federal historic properties, including: The Gore Estate (70000542), The Abraham Browne House (90000186), The Edmund Fowle House (77000189), The Miles Pratt House (85000980), The Old Watertown High School (06000860), The Town Diner (99001127), The Watertown Arsenal District (99000498), The Commanding Officer's Quarters (76000279), The Coolidge School (09000055), and the Mount Auburn Cemetery (75000264). These historic properties are located at a minimum of 500 feet away from any impaired water body, except for the Arsenal District, which is 200 feet away from an outfall. It has been determined to be very unlikely that any disturbance would impact these properties. Prior to construction of any structural BMPs, the Town will consult with the State Historic Preservation Officer by submitting a completed Project Notification Form to confirm that the proposed project will not impact any federal historic properties. 1.8 Increased Discharges Any increased discharges (including increased pollutant loadings) through the MS4 to waters of the United States are subject to Massachusetts antidegradation regulations at 314 CMR 4.04. Section 2.1.2 of the 2016 MS4 Permit requires the Town of Watertown to comply with the provisions of 314 CMR 4.04 including information submittal requirements and obtaining authorization for increased discharges where appropriate. Any authorization by MassDEP for an increased discharge is required to be incorporated into this SWMP. The Town understands that there shall be no increased discharges, including increased pollutant loadings from the MS4 to impaired waters listed in categories 5 or 4b on the most recent Massachusetts Integrated Report of Waters listed pursuant to Clean Water Act section 303(d) and 305(b) unless the Town demonstrates that there is no net increase in loading from the MS4 to the impaired water of the pollutant(s) for which the waterbody is impaired. If necessary, the Town of Watertown will demonstrate compliance with this provision by either: • Documenting that the pollutant(s) for which the waterbody is impaired is not present in the MS4's discharge and retaining documentation of this finding with the SWMP; or Documenting that the total load of the pollutant(s) of concern from the MS4 to any impaired portion of the receiving water will not increase as a result of the activity and retain documentation of this finding in the SWMP. Unless otherwise determined by the Permittee, USEPA or by MADEP that additional demonstration is necessary, compliance with the requirements of Part 2.2.2 and Part 2.3.6 of this permit, including all reporting and documentation requirements, shall be considered as demonstrating no net increase as required by this part. westonandsampson.com .,, -8 Weston ®Sampson STORMWATER MANAGEMENT PLAN 1.9 Surface Water Drinking Supplies Section 3.0 of the MS4 Permit requires permittees to prioritize discharges to public drinking water supply sources in implementation of the SWMP. The Town does not have any discharges to surface drinking water supply sources or their tributaries. .......................... westonandsampson.com 1-9 ........................................ 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QL��O " MP-G�NTREI �,E RE AVENUE ECMwOODSTREET �G.�' Co �v e��O // cE(O s `rS�R��7 w S���1LROAD z G r�G ET rtA N t J T� T f~ z 0 A ORE ❑ 'PQ9 WASHINGTON SIRE R'G A�flLIJ SON STIq ET V Quo. �e5'� / I-IARDVV 5 FE O° a N a Rr SrR �r ��� i } GE ERNON m [� % ��, Ir TREET tr � f- DONNYs n 9p SrREEI. z y'�TE I/_C Q° c m z ROOk.RO 'L� s° _ - 1 'u n p�E I �0 `02�� pERr o o NEwOA _ -1 z �' R° / �� �S�rR� srtD Ro IyEWTONVlLL [. . �, 94 / �J �� 4r ROAQ z? �5[REET ENUF rn TRF���rsr ! e¢�� ��z�' �� 0 UPCREs r Rays RRi�T srq��,T �4 O NTS S TREET [v .�� TREFT ►� F ¢ 0 FANEUIL 700 0 700 Scale In Feet STORMWATER MANAGEMENT PLAN 2.0 MINIMUM CONTROL MEASURES 2.1 Introduction This section of the report provides a summary of the regulatory requirements for each of the six minimum control measures as defined under the MS4 General Permit by the EPA. It also provides a summary of those stormwater management practices that the Town currently employs. As part of the requirements of the Notice of Intent submitted to EPA on October 1, 2018, as included in Appendix D, the Town has established a list of the Best Management Practices (BMPs) that it plans to implement in order to comply with each of the six minimum control measures. These BMPs will be implemented over the next five years (i.e. the permit term). However, the Town will have up to 20 years to implement some of the permit requirements as indicated. The Town's progress with respect to implementation of the BMPs, and other stormwater related activities, are summarized in annual reports submitted to EPA in accordance with the MS4 Permit. Under the 2003 MS4 Permit, the Town made significant progress in compliance with the requirements of the 2016 MS4 Permit. The Town of Watertown submitted 15 annual reports to EPA, in compliance with the 2003 MS4 Permit, between 2004 and 2018. Links to these reports are included in Appendix E. The BMPs selected for each minimum control measure are summarized and briefly described in this section. Specific details for each BMP including measurable goals, implementation dates and individuals responsible for implementation are stated in each of the respective sections for each control measure in this plan. The Town Manager, Board of Health, Community Development and Planning, the Department of Public Works, the Land Use Inspector, and the Stormwater Advisory Committee will be responsible for implementation and/or future enforcement of each of the BMPs for the six minimum control measures. Compliance with requirements of the permit related to water quality limited waters and approved TMDLs is included in Section 6. Checklists outlining requirements for Permit Years 1 through 5 are included in Appendix F. 2.2 Permit Requirements and Implementation Timeframes 2.2.1 Public Education and Outreach The public education and outreach minimum control measure requires the Town to make educational information available to the public and other stakeholders specified by the permit. Watertown has been participating in public education and outreach activities since the 2003 MS4 Permit was enacted. Regulatory Requirement: Section 2.3.2 of the 2016 MS4 General Permit requires permittees to "implement an education program that includes educational goals based on stormwater issues of significance within the MS4 area. The ultimate objective of a public education program is to increase knowledge and change behavior of the public so that pollutants in stormwater are reduced." westonandsampson.com .,, 2_1 Weston ®Sampson STORMWATER MANAGEMENT PLAN Existing Town Practices: Since the 2003 MS4 Permit became effective, the Town of Watertown has implemented several public education initiatives. It has staffed a booth at both the annual Faire on the Square, the Arbor Day of Service, and Environmental Fairs to educate the general public about stormwater. It has collaborated with local schools to incorporate stormwater into local curricula through the 7t" grade Future Cities project. The DPW has created signs labeling each of the Town's 32 outfalls to the Charles River and has monitored public comments about visual and olfactory issues. Lastly, the Department of Health has continued a system of visiting restaurants and auto garages to verify their compliance with grease trap regulations and used this as an opportunity to educate these institutions on further stormwater quality measures. The Town of Watertown will continue to implement these practices. Watertown DPW maintains its own web page, www.watertowndpw.org. On the main page, there are links to stormwater management and illicit discharge detection and elimination (IDDE) sub -pages under the "Divisions" tab. • The stormwater management page contains general information about stormwater issues and infrastructure in Watertown, a copy of the Town's drainage outfall map, stormwater programs for residents, and information about green infrastructure. There is also a section providing information about the Town's NPDES program, including copies of past annual reports and the current Notice of Intent, submitted to EPA in October, 2018. • The IDDE page defines the technical term "illicit discharge," discusses sources of illicit discharges and the Town's IDDE program, and indicates how to report a suspected illicit discharge. The Town also uploads copies of the quarterly IDDE reports submitted to EPA on this page. In addition to all the work being performed by the Town at present, this new iteration of the permit requires additional public education measures. Watertown must distribute two targeted messages within five years to the following audiences, spaced at least one year apart for each audience: 1. Residents 2. Businesses, Institutions and Commercial Facilities 3. Developers (Construction) 4. Industrial Facilities In order to accomplish this, the Town will implement the following BMPs: BMP: Local Public Service Announcements Description: Utilize the public cable access channel, the Town's website and/or social media, to air the public service announcement provided by the Mystic River Watershed Association to provide information to residents regarding stormwater management. Targeted Audiences: Residents. Responsible Department/Parties: Engineering Department Measurable Goals: The Engineering Department will ensure that pre -prepared media resources are distributed to the widest possible audience. The number of times the PSA is aired on the local cable access channel and the number of views on the Town's website or social media platform will be recorded. .................................................................................................................................................................... westonandsampson.com 2-2 Weston ®Sampson STORMWATER MANAGEMENT PLAN Implementation Timeframe: To be completed during Permit Year 1 (FY2019). BMP: Web Page/Social Media Description: Provide stormwater educational information on the Town's website addressing lawn/grounds maintenance, use of salt/de-icing materials, and other relevant practices. Targeted Audiences: Businesses, Institutions, and Commercial Facilities Responsible Department/Parties: DPW Measurable Goals: Using materials developed through the ThinkBlue Massachusetts campaign and others, DPW will post information to the Town's website targeted at businesses, institutions and commercial facilities, and track interaction with the site. Implementation Timeframe: To be completed during Permit Year 1 (FY2019) and materials to be maintained throughout the permit term. BMP: Web Page/Social Media Description: Make information available to landscapers, developers and contractors via the Town's website. Include general information on stormwater management, the Town's erosion and sediment control regulations, proper disposal of leaf litter, and planting of native plants and vegetative strips to disconnect impervious surfaces. Targeted Audiences: Developers (construction) Responsible Department/Parties: Engineering Department and Planning Department Measurable Goals: The Engineering Department will make all resources and information available on the Town's website. The Planning Department will make developers aware of this material when applying for permits for new and re -development and encourage interaction with the website. The number of interactions with the website will be tracked and reported upon in annual reports. Implementation Timeframe: To be completed during Permit Year 2 (FY2020) and materials to be maintained throughout the permit term. BMP: Special Events/Festivals/Fairs Description: Continue participation in the annual Faire on the Square including staffing a table to educate residents on the Town's stormwater system. Targeted Audiences: Residents Responsible Department/Parties: DPW, Stormwater Advisory Committee Measurable Goals: Continue to staff a table annually and track the number of residents reached. Implementation Timeframe: To be completed during Permit Year 1 (FY2019) and continued for the duration of the permit as feasible. BMP: School Curricula/Programs Description: Continue to participate in the 7th grade "Building Cities of the Future" Project to educate students regarding local stormwater issues and green infrastructure practices. Targeted Audiences: Residents Responsible Department/Parties: Stormwater Advisory Committee Measurable Goals: Continue to supplement program curricula in the 7th grade future cities project at local middle schools. Track number of students reached. Implementation Timeframe: To be completed during Permit Year 3 (FY2021) and continued for the duration of the permit, as feasible. westonandsampson.com .,, 2.3 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Web Page/Social Media Description: Make information available to property managers of industrial facilities via the Town's website regarding best management practices, including equipment inspection, waste disposal, dumpster maintenance, use and storage of de-icing materials, and parking lot sweeping. Targeted Audiences: Industrial Facilities Responsible Department/Parties: Engineering Department Measurable Goals: The Engineering Department will make all resources and information available on the Town website. The number of interactions with the website will be tracked and reported upon in annual reports. Implementation Timeframe: To be completed during Permit Year 2 (FY2020) and information to be maintained throughout the permit term, as feasible. BMP: Web Page/Social Media Description: Promote LID practices such as installation of vegetated filter strips to treat stormwater onsite and infiltrate to offset impervious area created through development via the Town's website. Targeted Audiences: Developers (construction) Responsible Department/Parties: Engineering Department, Planning Department Measurable Goals: Using materials developed through the ThinkBlue Massachusetts campaign, the Engineering Department will post information to the Town's website targeted at developers, and track interaction with the site. Implementation Timeframe: To be completed during Permit Year 4 (FY2022) and maintained for the duration of the permit, as feasible. BMP: Web Page Description: Create a section on the Town's website describing and incentivizing low impact development practices such as installing on -site stormwater runoff treatment systems and reducing impervious area footprint. Targeted Audiences: Industrial Facilities Responsible Department/Parties: Engineering Department, Planning Department Measurable Goals: Using materials developed through the ThinkBlue Massachusetts campaign, the Engineering Department will post information to the Town's website targeted at developers, and track interaction with the site. Implementation Timeframe: To be completed during Permit Year 4 (FY2022) and maintained for the duration of the permit, as feasible. BMP: Newspaper Articles/Press Releases Description: Create press release about the benefits of adopting low impact development practices such as disconnecting impervious surfaces. Targeted Audiences: Businesses, Institutions, and Commercial Facilities Responsible Department/Parties: Engineering, Planning Measurable Goals: Monitor online interaction, number of stories placed into circulation, and estimate audience reached. Implementation Timeframe: To be implemented during Permit Year 4 (FY2023). westonandsampson.com .,, 2-4 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Stormwater Information at Library Description: Provide the public with more detailed information about stormwater and stormwater issues in Watertown. The library offers an alternative for people who are hesitant to talk to regulatory officials or do not have internet access. The documents will be entered into the library's card catalog to allow patrons to find publications related to stormwater or in a reference library. Targeted Audiences: Residents Responsible Department/Parties: Engineering, Library Measurable Goals: Monitor list of publications that have been cataloged. Implementation Timeframe: To be implemented during Permit Year 2 (FY2020). BMP: Educational Signage Description: Provide educational signage at high visibility stormwater BMPs, such as rain gardens, bioretention areas, porous pavement installations, etc. The signage should identify the BMP and stormwater benefits. Alternatively, signage could identify the importance and issues related to stormwater. Targeted Audiences: Residents Responsible Department/Parties: DPW, DCDP Measurable Goals: Monitor the number of signs installed. Implementation Timeframe: To be implemented during Permit Year 2 (FY2020). BMP: Tax Bill Newsletter/Insert Description: Provide educational messaging in the quarterly tax bill newsletter/insert at least once per year. Targeted Audiences: Residents Responsible Department/Parties: DPW, Town Manager's Office Measurable Goals: Monitor the number and type of messages. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019). BMP: Meetings with Developers Description: Meet with prospective developers to discuss Town stormwater requirements Targeted Audiences: Developers Responsible Department/Parties: DPW, DCDP Measurable Goals: Report the number of meetings held with prospective developers. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019). Public education materials utilized in the implementation of the Town's SWMP are included in Appendix G. 2.2.2 Public Involvement / Participation Regulatory Requirement: Section 2.3.3 of the 2016 MS4 Permit requires the permittee to "provide opportunities to engage the public to participate in the review and implementation of the permittee's SWMP." Public participation benefits the program by increasing public support, including additional expertise and involving community groups/organizations. .................................................................................................................................................................... westonandsampson.com .,, 2-5 Weston ®Sampson STORMWATER MANAGEMENT PLAN Existing Town Practices: The Town of Watertown has been proactive in providing opportunities for public participation and involvement in stormwater management practices. The Town retains a Stormwater Advisory Committee (SAC) that is comprised of four citizens at -large and three staff members. The SAC acts as an advisory body to the Superintendent of Public Works and: • Develops educational programs and materials to increase public awareness of stormwater management; • Identifies and advocates for stormwater funding through grants and other sources; • Reviews and make recommendations on stormwater ordinances and related regulations; and • Performs other tasks relevant to assisting the Superintendent of Public Works with the implementation of best practices for stormwater management. The SAC holds regular meetings every third Thursday of the month; the meetings are open to the public and are posted in accordance with Town policies. The SAC also has a web page available at: https://www.ci.watertown.ma. us/451 /Stormwater-Advisory-Committee. The DPW supports volunteers in holding community clean up events along the Charles River in the spring and tree planting throughout town for Arbor Day. The Health Department holds 8 household hazardous waste removal days per year to dispose of oil -based paints, pesticides, cleaning solvents, cathode ray tubes, tires and mercury containing materials. The DPW makes rain barrels available to those residents who choose to participate in the program. In addition to continuing the above practices, it is recommended that the Town allow for public review of this stormwater management plan, by posting on the Town's website and through SAC meetings. These BMPs and others that the Town has committed to are detailed below. BMP: SWMP Review Description: The Engineering Department will make the SWMP available to the public when requested and provide for public comment annually. Responsible Department/Parties: Engineering, Stormwater Advisory Committee Measurable Goals: The Town will allow for annual review of the stormwater management plan by posting of the SWMP on the Town's website and/or by making it available at Town Hall and at SAC meetings for further discussion. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019) and for the duration of the permit as the SWMP is updated annually. BMP: Stormwater Committee[Task Force Description: Continue to hold regular public stormwater meetings as part of participation in the Watertown Stormwater Advisory Committee. Continue to post meetings and make them open to the public. Report number of meetings held each year. Targeted Audiences: Residents. Responsible Department/Parties: Engineering, Stormwater Advisory Committee Measurable Goals: The Town will track all meetings held and make minutes available to the public. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019) and tracked for the duration of the permit. westonandsampson.com .,, 2-6 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Catch Basin Stenciling Description: DPW facilitates teams of volunteers to perform catch basin stenciling in selected areas of town. Responsible Department/Parties: DPW, Engineering Department Measurable Goals: The Town will continue with their town -wide initiative to stencil catch basins with volunteers. They will track the number and location of catch basins stenciled. If the Town is unable to obtain volunteers, then Town staff or interns may perform the stenciling. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Stormwater Advisory Committee Description: The Stormwater Advisory engage the public on stormwater issues Responsible Department/Parties: DPW, Measurable Goals: Continue to add nE materials available to the public for the Implementation Timeframe: To be cons duration of the permit. Committee shall continue to make resources available to Engineering Department �w materials to the Stormwater Tool Box and make these it use in giving stormwater presentations to local groups. inued during Permit Year 1 (FY2019) and tracked for the BMP: Household Hazardous Waste/Used Oil Collection Description: Watertown will continue to provide monthly opportunities for residents to safely dispose of hazardous and oil wastes. Responsible Department/Parties: Health Department Measurable Goals: Allow for residents to dispose of hazardous waste one day per month from April through November at the Minuteman Regional Household Products Collection Facility. Track the number of Watertown residents that visit the facility, and the amount of waste collected. Implementation Timeframe: To be continued during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Shoreline/Waterbody Cleanups Description: The DPW will continue to provide opportunities for residents to participate in annual clean-up events on the banks of the Charles River. They will continue to provide the materials necessary to complete the task, including the required tools to collect debris safely and trucks to move disposed material. Responsible Department/Parties: DPW Measurable Goals: Continue to support community cleanup events annually by providing assistance with collection and disposal of debris. Track annually the number of clean-up events supported and the number of volunteers that participate. Implementation Timeframe: To be continued during Permit Year 1 (FY019) and tracked for the duration of the permit. BMP: Rain Barrel Distribution Description: Watertown DPW shall continue to make rain barrels available for purchase by the public, and advertise their intent to do so. Responsible Department/Parties: DPW Measurable Goals: Continue to make rain barrels available for purchase by Watertown residents. Track the number of rain barrels sold annually to residents. westonandsampson.com 2-7 Weston ®Sampson STORMWATER MANAGEMENT PLAN Implementation Timeframe: To be continued during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Mercury Collection Description: Watertown will continue to provide opportunities for residents to safely dispose of any mercury containing products. Responsible Department/Parties: DPW Measurable Goals: Continue to allow residents to drop off mercury devices at the DPW or the Recycling Center. Implementation Timeframe: To be implemented during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Curbside CRT Collection Description: Watertown will continue to facilitate curbside collection of discarded cathode ray tubes and publicize disposal at the Recycling Center. Responsible Department/Parties: DPW Measurable Goals: Continue to provide curbside collection of CRTs in addition to allowing homeowners to drop them off at the Recycling Center. The Town will track the number of CRTs collected. Implementation Timeframe: To be continued during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Tire Collection Drop Off Description: The Town will continue to publicize the opportunity for residents to drop off used tires to the DPW annually. Responsible Department/Parties: DPW Measurable Goals: Continue to hold two annual tire collection drop off events as part of larger recycling events and track the number of tires collected. Implementation Timeframe: To be continued during Permit Year 1 (FY2019) and tracked for the duration of the permit. BMP: Stormwater Tour Description: Provide a walking tour of areas of interest related to stormwater, water quality, and the environment. Targeted Audiences: Residents Responsible Department/Parties: DPW, SAC, Live Well Watertown Measurable Goals: Report number of participants annually. Implementation Timeframe: To be implemented during Permit Year 1 (FY2020). BMP: SWMP Cost Trackina Description: Track, report and project cost information related to implementation of the SWMP. Targeted Audiences: Residents, Elected Officials Responsible Department/Parties: DPW, Town Manager's Office, Town Auditor Measurable Goals: Cost information reported on an annual basis. Implementation Timeframe: To be implemented during Permit Year 4 (FY2023). westonandsampson.com .,, 2_8 Weston ®Sampson STORMWATER MANAGEMENT PLAN 2.2.3 Illicit Discharge Detection and Elimination Regulatory Requirement: Section 2.3.4 of the 2016 MS4 General Permit requires the permittee to develop a written Illicit Discharge Detection and Elimination (IDDE) program. The IDDE program is designed to "systematically find and eliminate sources of non-stormwater discharges to its municipal separate storm sewer system and implement procedures to prevent such discharges." Existing Town Practices: In response to an EPA Administrative Order concerning non-stormwater discharges from the MS4 and its tributaries to the Charles River, the Town of Watertown adopted an IDDE Plan that was approved by EPA in June 2006. An addendum was later prepared in November 2011. The purpose of this plan is to present a defined approach to investigate, identify and remove illicit connections. The Town shall continue to enforce and update the plan as needed throughout the permit term. Subsequent to the development of this plan, the Town has implemented a comprehensive IDDE investigation program. Since 1997, approximately 98% of the Town's key junction storm drain manholes have been inspected, monitored and tested for the presence of indicator parameters, and an estimated 4,680 gpd of illicit discharge flow has been removed from the Town's drainage system. This includes the removal of approximately 60 illicit discharges. DPW and Engineering will continue to implement their IDDE Program and update their drainage system map, as needed, as additional investigation is performed through TV, smoke and dye testing of sewer and drain pipes in the town. Lastly, the Town will continue their effort to extend IDDE educational outreach by making information available to the public through the Town's website, and continue to train employees on illicit discharge detection and elimination. These permit requirements can be achieved through implementation of the following BMPs: BMP: SSO Inventory Description: Develop Sanitary Sewer Overflows (SSO) inventory in accordance with permit conditions. Responsible Department/Parties: DPW Measurable Goals: Complete an ongoing list of SSOs that have occurred in the last 5 years and note when each has been addressed. Implementation Timeframe: To be completed within 1 year of the effective date of the permit and updated annually (FY2019). BMP: Storm Sewer System Map Description: Continue to update existing drainage map, as needed, to address permit requirements and continue to update during IDDE program implementation. Responsible Department/Parties: Engineering Measurable Goals: Update the Town's existing drainage map to include a full inventory of the Town's storm drain system including the following within 2 years of the permit effective date: • all outfalls and receiving waters (already mapped), • open channel conveyances, • interconnections with other MS4s (already mapped), • municipally -owned stormwater treatment structures, westonandsampson.com .,, 2-9 Weston ®Sampson STORMWATER MANAGEMENT PLAN • impaired waterbodies, • and initial catchment delineations (already mapped). Within 10 years of the permit effective date, this map shall also include: • location of outfalls with an accuracy of +/- 30 feet (already mapped), • all pipes (already mapped), • manholes (already mapped), • catch basins (already mapped), • refined catchment delineations, and • municipal sanitary sewer system (already mapped). In addition, EPA suggests adding, but does not require, the following information, some of which the Town is actively working to incorporate: • storm and sanitary sewer material, size and age, • privately -owned stormwater treatment structures, • septic systems and areas likely to be affected by septic leaching (not applicable in Watertown), • seasonal high water table elevations, • topography, • orthography, • alignments, dates and representation of illicit discharge remediation, • and locations of suspected, confirmed and corrected illicit discharges. Implementation Timeframe: Complete initially mapping updates within 2 years of the permit effective date and complete full system map within 10 years of permit effective date (FY2020, FY2029). BMP: Written IDDE Program Description: Update, as needed, and continue to implement the IDDE Plan. Responsible Department/Parties: DPW Measurable Goals: Watertown will update the existing IDDE Plan as needed to satisfy the 2016 MS4 Permit requirements. Implementation Timeframe: To be completed within 1 year of the effective date of the permit (FY2019). BMP: Employee Training Description: Watertown will continue training employees regarding IDDE investigation procedures. Responsible Department/Parties: DPW Measurable Goals: Continue to train municipal employees on illicit discharge detection and monitoring. Implementation Timeframe: To be completed within 1 year of the effective date of the permit (FY2019). .................................................................................................................................................................... westonandsampson.com .,, 2-10 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Conduct Dry Weather Screening Description: Continue to conduct dry weather screening and sampling procedures in accordance with permit conditions. Responsible Department/Parties: Engineering Measurable Goals: Visit every regulated outfall, record current conditions, and obtain samples of any flow that is present. Send any samples to an external laboratory to test for the presence of any indicators. Implementation Timeframe: Complete within 3 years of the permit effective date (FY2022). BMP: Conduct Wet Weather Screening Description: Continue to conduct Wet Weather Screening in accordance with outfall screening procedure and permit conditions. Responsible Department/Parties: Engineering Measurable Goals: Less than 24 hours after a rain event, visit any outfall determined to require additional screening (i.e. any outfall that has one or more system vulnerability factors) and obtain samples of any flow that is present and send to an external laboratory to be tested for any indicators. Implementation Timeframe: Complete within 10 years of the permit effective date (FY2028). BMP: Ongoing Screening Description: Conduct Dry and Wet weather screening (as necessary). Responsible Department/Parties: Engineering Measurable Goals: Complete ongoing outfall screening upon completion of IDDE program implementation. Implementation Timeframe: To be performed once initial screening of outfalls and IDDE investigations are complete (FY2029). BMP: Catchment Prioritization and Ranking Description: Assess and rank the potential for all catchments to have illicit discharges. Responsible Department/Parties: Engineering Measurable Goals: The Town has assessed within existing catchments the potential for illicit discharges by obtaining and evaluating data regarding the following: • Sensitivity or critical nature of the receiving water or environment • Severity of the illicit connection indicator parameters • Potential for direct or indirect public exposure • Areas with chronic problems and inadequate level of service • Areas proposed for infrastructure capital improvements Since the Town has already ranked and prioritized their catchments for investigation, most notably based on available outfall sampling data, the Town has a strong understanding of problem catchment areas. To complete an additional ranking exercise seems redundant and priority for ongoing investigations should be assigned to outfalls as determined by the criteria above. Implementation Timeframe: To be completed within 1 year of the permit effective date (FY2019). westonandsampson.com .,, 2-11 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: IDDE Ordinance/Bylaw Description: Continue to prohibit illicit discharges as outlined in the Town's Illicit Discharge Ordinance, and take enforcement actions as needed. Responsible Department/Parties: Engineering Measurable Goals: Report the number of enforcement actions taken annually. Implementation Timeframe: To be completed within 1 year of the permit effective date (FY2019). BMP: Follow-up Ranking Description: Update catchment prioritization and ranking as additional dry weather screening information becomes available. Responsible Department/Parties: Engineering Measurable Goals: The outfall ranking described above shall be amended by the Town as new sampling results become available after the first round of dry -weather screening and sampling. Implementation Timeframe: To be completed within three years of the permit effective date (FY2021). BMP: Catchment Investigation Procedures Description: Develop written catchment investigation procedures and incorporate into the IDDE Plan. Responsible Department/Parties: DPW Measurable Goals: Amend written IDDE Plan as needed with catchment investigation procedures. Implementation Timeframe: To be completed within 18 months of the permit effective date (FY2020). BMP: Web Page Description: Continue to maintain a separate section of the web site focused on IDDE, including the definition of an illicit discharge, how to report illicit discharges, and copies of IDDE plans and progress reports. Responsible Department/Parties: DPW Measurable Goals: The number of interactions with the website will be tracked and reported upon in annual reports. Implementation Timeframe: To be completed within 18 months of the permit effective date (FY2020). 2.2.4 Construction Site Stormwater Runoff Control Regulatory Requirement: Section 2.3.5 of the 2016 MS4 Permit requires the permittee to create a program to "minimize or eliminate erosion and maintain sediment on site so that it is not transported in stormwater and allowed to discharge to a water of the US through the permittee's MS4." The permittee will conduct site plan reviews, site inspections and include procedures for public involvement. Existing Town Practices: Watertown has a comprehensive Erosion and Sediment Control Ordinance that was promulgated on February 23, 2016. This ordinance requires a Stormwater Management and Erosion Control Permit for the following activities: land disturbances activities of 5,000 square feet or more, or smaller activities that are part of a larger common development plan that will disturb 5,000 square feet or more; increases in site impervious area by more than 500 square feet; creation of any new or modification of any existing direct connection to the MS4; or at the discretion of the DPW for any activity that may result in an adverse impact on the MS4 or water resources of the Town of Watertown. This ordinance gives DPW the authority to enforce all that is set forth in the rules and regulations. westonandsampson.com 2-12 Weston ®Sampson STORMWATER MANAGEMENT PLAN The Town of Watertown has been proactive about listening to public comments and complaints about the effectiveness of active construction site's erosion and sediment control practices and will continue to monitor any input received. To attain compliance with the 2016 MS4 Permit, the Town will implement the following BMPs to supplement the guidelines set forth in their Erosion and Sediment Control Ordinance. BMP: Site Inspection and Enforcement of Erosion and Sediment Control (ESQ Measures Description: Continue to implement existing written site inspection and enforcement procedures in accordance with the Town's Stormwater Management and Erosion Control Ordinance and Rules and Regulations. Refer to Section 3 of this plan for specific updates to regulatory measures related to construction site runoff control. Responsible Department/Parties: Planning Board, Engineering Measurable Goals: Continue to enforce erosion and sediment control measures and report on the number of site plan reviews, inspections and enforcements that occur annually. Implementation Timeframe: Complete within 1 year of the effective date of the permit (FY2019). BMP: Site Plan Review Description: Continue to follow existing written procedures for conducting site plan reviews. Responsible Department/Parties: Planning Board, Engineering Measurable Goals: Continue to implement site plan review procedures and report on the number of site plans reviewed annually. Implementation Timeframe: Complete within 1 year of the effective date of the permit (FY2019). BMP: Erosion and Sediment Control Description: Continue to require developers to implement a sediment and erosion control program that includes BMPs that are appropriate for the conditions at the construction site in accordance with the Town's Stormwater Management and Erosion Control Rules and Regulations. Review existing regulations and update as needed to meet permit conditions. Responsible Department/Parties: Engineering, Planning Board Measurable Goals: Continue to enforce existing sediment and erosion control requirements, and update regulations as needed. Implementation Timeframe: To be updated within 1 year and enforced every year after the permit effective date (FY2019). BMP: Waste Control Description: Incorporate requirements for construction site operators to control waste, including but not limited to, discarded building materials, concrete truck wash out, chemicals, litter, and sanitary wastes into existing stormwater regulations. Responsible Department/Parties: DPW, Building Department Measurable Goals: Update requirements to include control of wastes as needed within one year of the permit effective date. Implementation Timeframe: To be completed during the first year after the effective permit date (FY2019). westonandsampson.com .,, 2-13 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Construction Standard ESC Specifications and Detailed Drawings Description: Continue to make standard erosion and sediment control details available on the DPW website and distribute as needed and continue to inspect construction sites for compliance. Responsible Department/Parties: Engineering, DPW, Planning Department Measurable Goals: Review existing standards and update as needed. Implementation Timeframe: To be completed within one year of the permit effective date (FY2019). 2.2.5 Post -Construction Stormwater Management Regulatory Requirement: Section 2.3.6 of the 2016 MS4 Permit requires the permittee to require developers to "reduce the discharge of pollutants found in stormwater through the retention or treatment of stormwater after construction on new or redeveloped sites." In this case, a site is defined as the "area extent of construction activities which includes but is not limited to the creation of new impervious cover and improvement of existing impervious cover." New Development is defined as construction activity that results in a total earth disturbance area equal to or greater than one acre on land that did not have any impervious area before work began. Redevelopment is defined as any construction activity that disturbs greater than or equal to one acre and does not meet the requirements to be designated as new development. Existing Town Practices and Amendments: The Town of Watertown has incorporated post construction stormwater management control measures in the Erosion and Sediment Control Ordinance that was promulgated in 2016. The Town's Rules and Regulations for Stormwater Management and Erosion Control currently outline as -built requirements and require submission of an O&M Plan. They also require that stormwater management systems meet the Town's retention standard, and be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm. Under the new permit, existing requirements will be reviewed for compliance with permit conditions and updated as needed. In order to comply with the requirements of the 2016 MS4 Permit, the Town shall implement the following BMPs: BMP: As -Built Plans for On -site Stormwater Control Description: The Town's Rules and Regulations for Stormwater Management and Erosion Control currently outline as -built requirements and require submission of an O&M Plan. Existing requirements will be reviewed for compliance with permit conditions and updated as needed. Responsible Department/Parties: Planning Department, Engineering Measurable Goals: Require submission of as -built plans for completed projects within two years of construction completion. Update existing regulations as needed within two years of permit effective date. Implementation Timeframe: Complete within 2 years of the permit effective date (FY2020). westonandsampson.com .,, 2-14 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Storm Sewer System Map Description: Incorporate relevant stormwater permit data and as -built features into the Town's drainage map for projects subject to the Town's Stormwater Management and Erosion Control Ordinance as well as municipal projects. Responsible Department/Parties: Engineering Measurable Goals: Begin mapping within 2 years of the permit effective date: BMP: Target Properties to Reduce Impervious Areas Description: Maintain and update the list of 22 previously identified permittee-owned properties that could be modified or retrofitted with BMPs to reduce frequency, volume, and pollutant loads associated with stormwater discharges that was developed as a result of the 604(b)/319 statewide Nonpoint Source Grants Program. In particular, preliminary designs were developed for a bioretention facility at the DPW and a rain garden at the Hosmer Elementary School. Watertown received this grant to locate and design BMPS to mitigate the effects of pollutant loads from entering the Charles River. Responsible Department/Parties: Engineering, DPW Measurable Goals: This goal can be achieved through disconnecting impervious surfaces, introducing low impact development and green infrastructure practices, or re -defining zoning regulations to change maximum sizes of parking lots and lane widths. Report annually on progress and retrofitted properties targeted by this effort. Implementation Timeframe: Complete within 4 years of the permit effective date, and report annually regarding the number of retrofits identified thereafter, to maintain at least 5 retrofits always for the duration of the permit (FY2022). BMP: Review Capital Projects for Stormwater Management Retrofits Description: The Town has an annual residential road reconstruction program and several corridor planning projects underway. Other capital programs include reconstruction of town schools, parks, and other properties. These programs provide an opportunity to perform stormwater retrofits of the existing drainage systems to include BMPs such as green infrastructure to reduce stormwater runoff and improve water quality. Responsible Department/Parties: Engineering, DPW Measurable Goals: Complete assessments for each type of project and measure number of BMPs installed and estimated pollutant removal. Implementation Timeframe: Complete within 2 years of the permit effective date, and report annually regarding the number of retrofits identified and installed thereafter. BMP: Allow for Green Infrastructure Description: Develop a report assessing existing local regulations to determine the feasibility of making green infrastructure practices allowable when appropriate site conditions exist. Responsible Department/Parties: Planning Department, Engineering Measurable Goals: Complete assessment and implement recommendations of the report. Implementation Timeframe: Complete within 4 years of the permit effective date (FY2022). westonandsampson.com .,, 2-15 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Street Design and Parking Lot Guidelines Description: Develop a report assessing requirements that affect the creation of impervious cover. The assessment will help determine if changes to design standards for streets and parking lots can be modified to support low impact design options. Responsible Department/Parties: Engineering, Planning Board Measurable Goals: Complete assessment and implement recommendations of the report where feasible. Implementation Timeframe: Complete within 4 years of the permit effective date (FY2022). BMP: Ensure the Requirements of the MA Stormwater Handbook are Met Description: Ensure any stormwater controls or management practices for new development and redevelopment meet the retention or treatment requirements of the permit and all applicable requirements of the Massachusetts Stormwater Handbook. Responsible Department/Parties: Engineering, Planning Board Measurable Goals: Adopt, amendment, or modification of a regulatory mechanism to meet permit requirements. Implementation Timeframe: Complete within 2 years of the permit effective date (FY2020). BMP: Tree Planting Program Description: Continue to include tree plantings as part of Town infrastructure projects as well as annual plantings to maintain and increase the tree canopy. Responsible Department/Parties: DPW Measurable Goals: Number of trees planted per year. Implementation Timeframe: To be continued during Permit Year 1 (FY2019) and tracked for the duration of the permit. 2.2.6 Pollution Prevention / Good Housekeeping Regulatory Requirement: Section 2.3.7 of the 2016 MS4 Permit requires the permittee to "implement an operations and maintenance program for permittee-owned operations that has a goal of preventing or reducing pollutant runoff and protecting water quality form all permittee-owned operations." This minimum control measure includes a training component and has the ultimate goal of preventing or reducing stormwater pollution from municipal activities and facilities such as parks and open spaces, buildings and facilities, vehicles and equipment, and providing for the long- term operation and maintenance of MS4 infrastructure. Existing Town Practices: Watertown has an extensive list of currently employed good housekeeping measures adopted during the 2003 MS4 Permit. At least once a year, the DPW inspects all outfalls and they are maintained as needed, almost 100% of the Town's catch basins are cleaned annually, and all streets are swept at least twice per year. The Town also updates their emergency management plan at least once per permit period to foster discussion with emergency services and other Town departments. They have a spill truck available to respond to emergencies at any time. They have an integrated pest management program, and are reducing sand and salt usage to keep chemicals off the street. They have resolved to train public works employees on good .................................................................................................................................................................... westonandsampson.com 2-16 Weston ®Sampson STORMWATER MANAGEMENT PLAN housekeeping techniques, and the DPW staff participates in events put on by the Charles River Watershed Collaborative. To achieve compliance with the 2016 MS4 Permit, catch basins must be no more than 50% full at any given time. To achieve this, all structures must be cleaned, measured, logged and monitored to prevent excessive sediment accumulation. These measures are summarized in the following BMP practices: BMP: O&M Procedures Description: Create written operation and maintenance (O&M) procedures addressing proper storage of materials, lawn maintenance and landscaping activities, protective practices, use and storage of petroleum products, employee training, waste management procedures for buildings and facilities, location of fueling areas, evaluation of possible leaks, and storage locations of Town -owned vehicles and equipment. Responsible Department/Parties: DPW, Engineering Measurable Goals: Create and implement standard operation and maintenance procedures for all municipal activities and facilities. The Town will be as specific with standard operating procedures as possible and ensure the continued implementation of all maintenance activities. Implementation Timeframe: Complete within 2 years of the permit effective date (FY2020). BMP: Inventory all Permittee-Owned Property Description: Inventory all permittee-owned parks and open spaces, buildings and facilities, and vehicles and equipment and update annually. Responsible Department/Parties: Engineering, DPW Measurable Goals: Create inventory and update annually. Implementation Timeframe: Complete within 2 years of the permit effective date (FY2020). BMP: Infrastructure O&M Description: Establish and implement a program for repair and rehabilitation of MS4 infrastructure. Responsible Department/Parties: DPW, Engineering Measurable Goals: Create and implement an operation and maintenance plan for stormwater infrastructure. Implementation Timeframe: Complete within 2 years of the permit effective date (FY2020). BMP: Stormwater Pollution Prevention Plan (SWPPP� Description: Create SWPPPs for all waste handling facilities, including the DPW facility on Orchard Street and the Town's Recycling Center. Responsible Department/Parties: DPW Measurable Goals: Complete plans and implement within 2 years of the permit effective date. Complete inspections on a quarterly basis and training annually in accordance with permit conditions. Implementation Timeframe: Complete and implement within 2 years of the permit effective date (FY2020). westonandsampson.com .,, 2-17 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Catch Basin Cleaning Description: Develop a catch basin optimization plan and establish schedule for catch basin cleaning such that each catch basin is no more than 50% full and clean catch basins on that schedule. Responsible Department/Parties: DPW Measurable Goals: Clean catch basins on established schedule and report number of catch basins cleaned and volume of material removed annually. The Town shall optimize the cleaning effort such that all catch basins have been located, measured, cleaned and monitored to ensure that each basin does not become more than 50% full of sediment and debris. Implementation Timeframe: Complete and implement catch basin optimization plan within two years of permit effective date (FY2020). BMP: Street Sweeping Program Description: Sweep all streets and permittee-owned parking lots annually in accordance with permit conditions. Responsible Department/Parties: DPW Measurable Goals: Sweep all streets and permittee-owned parking lots annually. Implementation Timeframe: Complete and implement within 1 year of the permit effective date (FY2019). BMP: Inspection and Maintenance of Stormwater Treatment Structures Description: Establish and implement inspection and maintenance procedures and frequencies. Responsible Department/Parties: DPW Measurable Goals: Inspect and maintain treatment structures at lease annually. Track number of structures maintained and inspected annually. Implementation Timeframe: Inspection and maintenance of treatment structures to begin in Year 1 and to be completed annually thereafter (FY2019). Written inspection and maintenance procedures to be developed in Year 2 (FY2020) as part of creating standard operating procedures for infrastructure operation & maintenance. BMP: Road Salt Use Optimization Program Description: Continue to update the Town's existing program to minimize the use of road salt and sand, including the implementation of a computerized control system for salting equipment to improve salt distribution and application efficiency. Responsible Department/Parties: DPW Measurable Goals: Implement salt use optimization during deicing season. Track reduction in salt usage based on salt use optimization. Implementation Timeframe: Complete and implement within 1 year after the permit effective date (FY2019) . BMP: Update Emergency Management Plan Description: Review and update Emergency Management Plan as appropriate. Responsible Department/Parties: DPW, Emergency Services Measurable Goals: Meet with Health, Police and Fire Depts. on a routine basis to discuss emergency management issues. Implementation Timeframe: Complete and implement within 1 year after the permit effective date (FY2019) . westonandsampson.com .,, 2-1 8 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP: Integrated Pest Management Program Description: Exclude pesticide use on Town properties. Responsible Department/Parties: DPW Measurable Goals: Continue to implement Integrated Pest Management Program for open spaces, parks, and greenways under Town jurisdiction. Implementation Timeframe: Complete and implement within 1 year of the permit effective date (FY2019). BMP: Intermunicipal Collaboration/Cooperation Description: Continue participation in the Mystic River Stormwater Collaborative and Charles River Watershed Coalition. Responsible Department/Parties: DPW Measurable Goals: Number of meetings attended. Implementation Timeframe: Complete and implement within 1 year of the permit effective date (FY2019). BMP: Single Use Bag Prohibition Description: In 2017, a "Bring Your Own Bag Ordinance" (Chapter 31 of the Code of Ordinances) was established with the stated goal of reducing the impact of plastic bags on the environment. Plastic bags clog our drainage systems, and disrupt the land and marine environment. Local businesses may now only provide paper bags, degradable bags, or reusable bags. Responsible Department/Parties: DCDP Measurable Goals: Continue enforcement of existing ordinance. Implementation Timeframe: Ongoing. westonandsampson.com 2_1 9 Weston®Sampson STORMWATER MANAGEMENT PLAN 3.0 REGULATORY STANDARDS 3.1 Introduction In order to prevent pollutants from entering the drainage system and being discharged to the environment with stormwater, Watertown has implemented a wide variety of Best Management Practices (BMPs) categorized under the six minimum control measures as discussed earlier in this document. The control measures for Illicit Discharge Detection and Elimination, Construction Site Stormwater Runoff Control, and Post -Construction Stormwater Management are focused on improving stormwater pollution prevention into the future through implementation of the following: • Regulatory mechanisms establishing legal authority, prohibitions and requirements • Design and construction standards governing stormwater infrastructure • Requirements for long-term Operation and Maintenance (O&M) of structural BMPs. Additional information regarding the Town's current regulatory mechanisms adopted under the 2003 MS4 Permit, as well as the status of the Town's compliance with the 2016 MS4 Permit regulatory requirements are included in this section. 3.2 Existing Stormwater Regulatory Mechanisms Under the 2003 MS4 Permit, the Town developed new ordinances, as well as rules and regulations, to comply with the permit, and to improve stormwater management town -wide. The requirements adopted were progressive, and in many cases, exceeded the permit requirements. 3.2.1 Prohibition of Illicit Discharges to the Storm Drain System Since 1990, the Town's "Sanitary Sewer and Storm Drain Regulations" have prohibited improper discharges to the storm drain system. To supplement and enhance these regulations, Watertown adopted an ordinance entitled, Prohibition of Illicit Discharges to the Storm Drainage System on October 23rd, 2011. This ordinance provides the legal authority to enforce the IDDE plan developed by the Town in 2006. A copy of this ordinance is included in Appendix H. Its main purpose is to prevent any introduction of pollutants to Watertown's MS4 from stormwater discharges by any user, prohibit illicit connections to the MS4, and to allow the Town to monitor the system and remove any found illicit connections. The ordinance is granted authority by the Home Rule Amendment of the Massachusetts Constitution, Home Rule statues, and the Clean Water Act, 40 CFR 122.34. This ordinance prohibits non-stormwater discharges to the drainage system. It also provides a specific list of non-stormwater discharges that are permissible under federal regulations, and by reference, local ordinance. The Department of Public Works is responsible for enforcement, and has the authority to investigate suspected illicit discharges. The Town has the authority to suspend or terminate the right to discharge to the MS4 of any discharger, including discharges associated with active construction sites. The ordinance mandates that all spills must be reported to the DPW, and penalties and fines may be levied. westonandsampson.com 3-1 Weston ®Sampson STORMWATER MANAGEMENT PLAN Separately, the Town also has an animal control ordinance, which regulates disposal and management of waste from dogs, including prohibiting waste from being disposed of into catch basins. A copy of this ordinance is included in Appendix H. 3.2.2 Stormwater Management and Erosion Control Ordinance The 2003 MS4 Permit required the Town to develop, implement and enforce a program to address stormwater runoff from construction activities and from new development and redevelopment that disturbs greater than one acre and discharges into the MS4. That program was also to include projects that disturb less than one acre if the project is part of a larger common plan of development which disturbs greater than one acre. As part of that program, the Town was to develop an ordinance or other regulatory mechanism to address construction runoff. On February 23, 2016, the Town held a public hearing where an Ordinance establishing Requirements for Stormwater Management and Erosion Control was adopted (Chapter 98 of the Town Code of Ordinances). A copy of this ordinance is included in Appendix H. This ordinance provides the regulatory authority to ensure compliance with the provisions outlined through permitting, inspection, maintenance and enforcement. This ordinance requires that a Stormwater Management and Erosion Control Permit is obtained for the following activities: land disturbances activities of 5,000 square feet or more, or smaller activities that are part of a larger common development plan that will disturb 5,000 square feet or more; increases in site impervious area by more than 500 square feet; creation of any new or modification of any existing direct connection to the MS4; or at the discretion of the DPW for any activity that may result in an adverse impact on the MS4 or water resources of the Town of Watertown. This ordinance gives DPW the authority to enforce all that is set forth in the rules and regulations. 3.2.3 Rules and Regulations for Stormwater Management and Erosion Control The Town also established separate Rules and Regulations for Stormwater Management and Erosion Control, which are referenced in Chapter 98 of the Town's ordinance, and were promulgated on August 4, 2017. A copy of these Rules and Regulations is included in Appendix H. For all new development and redevelopment projects, stormwater management systems must meet the Town's retention standard, and be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm. The Regulations also require sediment and erosion controls at construction sites, as well as the long- term operation and maintenance of BMPs. 3.3 Review of Regulatory Mechanisms for Compliance with the 2016 MS4 Permit A comprehensive review was conducted to evaluate whether the Town's existing regulatory mechanisms for construction and post -construction stormwater management comply with the 2016 MS4 Permit requirements, and identify what modifications, if any, are needed to bring the Town into compliance. 3.3.1 Construction Site Stormwater Runoff Control The 2016 MS4 Permit builds on the requirements of the 2003 MS4 Permit for construction site runoff control and requires the following (Year 1 requirements): westonandsampson.com 3-2 Weston ®Sampson STORMWATER MANAGEMENT PLAN Site Inspection & Enforcement Permit Requirement: Development of written procedures for site inspections and enforcement of sediment and erosion control measures. These procedures shall clearly define who is responsible for site inspections as well as who has authority to implement enforcement procedures. The program shall provide that the permittee may, to the extent authorized by law, impose sanctions to ensure compliance with the local program. These procedures and regulatory authorities shall be documented in the SWMP. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 10.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control outline requirements for construction inspections. Section 10.1 requires the permittee to "notify the Department of Public Works at least 14 days prior to the commencement of construction. In addition, the permittee must notify the Department of Public Works a minimum of 14 days in advance of construction of critical components of any stormwater management facility or BMP." Section 10.2 requires that the Department of Public Works "inspect the project site at the following stages, at a minimum: • Initial Site inspection: prior to approval of any plan; • Erosion Control Inspection: An inspection to ensure that erosion control practices are in accordance with the approved Erosion and Sediment Control Plan. Such inspection must be made prior to commencement of any earth moving activity; • Completion of site clearing; • Close of the construction season; • Stormwater Management System Inspection: An inspection will be made of the completed stormwater management system, prior to backfilling of any underground drainage or stormwater conveyance structures; and • Final Inspection: After completion of all work and stabilization of all soils, the Department of Public Works or an authorized agent shall perform an inspection of the system." Section 10.3 indicates that "if any component of the erosion and sediment control measures or stormwater management system is found to be inadequate by virtue of physical evidence of operational failure, including evidence of erosion or sedimentation on adjacent properties, rights -of - ways, the MS4, wetland, or watercourse, even if it was built in accordance with the approved Stormwater Management Plan, it shall be corrected by the Permittee. Failure of the Permittee to take corrective action shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 98.06 of the Ordinance." Furthermore, "any activity that fails to comply with the conditions of the approved Erosion and Sediment Control Plan shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 6.0 of the Ordinance." Section 6.0 of the Town's Ordinance establishing Requirements for Stormwater Management and Erosion Control grants the Department of Public Works the authority to enforce the Ordinance and the Rules and Regulations by issuing orders, violation notices, and enforcement orders, as well as pursuing all available civil and criminal remedies for such violations. westonandsampson.com 3-3 Weston ®Sampson STORMWATER MANAGEMENT PLAN Section 10.0 of the Rules and Regulations indicates that the Department of Public Works conducts inspections. Section 6.3.4 of the Town's Rules and Regulations indicates that the Department of Public Works may "engage the employment of outside consultants for specific expert services deemed necessary by the Department." This includes site inspections. The Town has also developed Standard Operating Procedures (SOP), which outline sediment and erosion control plan requirements, inspection requirements, and enforcement procedures as outlined in the Town's stormwater bylaw and regulations. Sediment and Erosion Control BMPs Permit Requirement: Requirements for construction site operators performing land disturbance activities within the MS4 jurisdiction that result in stormwater discharges to the MS4 to implement a sediment and erosion control program that includes BMPs appropriate for the conditions at the construction site. The program may include references to BMP design standards in state manuals, such as the Massachusetts Stormwater Handbook or design standards developed by the MS4. EPA supports and encourages the use of design standards in local programs. Examples of appropriate sediment and erosion control measures for construction sites include local requirements to: • Minimize the amount of disturbed area and protect natural resources • Stabilize sites when projects are complete, or operations have temporarily ceased • Protect slopes on the construction site • Protect all storm drain inlets and armor all newly constructed outlets • Use perimeter controls at the site • Stabilize construction site entrances and exists to prevent off -site tracking • Inspect stormwater controls at consistent intervals Excerpts from Watertown's Regulations that Support Permit Requirement: Section 9.11 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicates that "the Erosion and Sediment Control Guidelines for Urban and Suburban Areas, published by the MassDEP, originally dated March 1997, as amended, shall be used as the technical reference guide for the implementation of plans to control construction -related impacts, including erosion, sedimentation, and other pollutant sources during construction and land disturbance activities." Control of Wastes Permit Requirement: Requirements for construction site operators within the MS4 jurisdiction tc control wastes, including but not limited to, discarded building materials, concrete truck wash out, chemicals, litter, and sanitary wastes. These wastes may not be discharged to the MS4. Excerpts from Watertown's Regulations that Support Permit Requirement: In a separate SOP developed by the Town, which outlines sediment and erosion control plan requirements, inspection requirements, and enforcement procedures as outlined in the Town's stormwater bylaw and regulations, a statement has been included under Erosion and Sediment Control Plan requirements related to construction debris. It states that the following should be included under the Erosion and Sediment Control Plan requirements "a description of construction and waste materials expected to be stored on -site, including discarded building materials, concrete truck washout, chemicals, litter, and sanitary waste as well as a description of practices to control these wastes to avoid adverse westonandsampson.com 3-4 Weston ®Sampson STORMWATER MANAGEMENT PLAN impacts to water quality. The description of controls to reduce pollutants from these materials shall include storage practices to minimize exposure of the materials, and spill prevention and response." Site Plan Review Inspection and Enforcement Permit Requirement: Development of written procedures for site plan review, inspection and enforcement. The site plan review procedure shall include a pre -construction review by the permittee of the site design, the planned operations at the construction site, planned BMPs during the construction phase, and the planned BMPs to be used to manage runoff created after development. The review procedure shall incorporate procedures for the consideration of potential water quality impacts, and procedures for the receipt and consideration of information submitted by the public. The site plan review procedure shall also include evaluation of opportunities for use of low impact design and green infrastructure. When the opportunity exists, the permittee shall encourage project proponents to incorporate these practices into the site design. The procedures for site inspection conducted by the permittee shall include the requirement that inspections occur during construction of BMPs as well as after construction of BMPs to ensure they are working as described in the approved plans, clearly defined procedures for inspections including qualifications necessary to perform the inspections, the use of mandated inspections forms if appropriate, and procedure for tracking the number of site reviews, inspections, and enforcement actions. Excerpts from Watertown's Regulations that Support Permit Requirement: The DPW has developed On Site Drainage Requirements for DPW Site Plan Review, which are distributed to developers. The DPW has a Site Plan Review Checklist for single- and two-family construction. The Department of Community Development and Planning also has a separate Site Plan Review Submission Checklist. Section 7.2 of the Town's Rules & Regulations discusses the requirements of the Proposed Conditions Plan, and Section 7.3 includes the requirements of the Erosion and Sediment Control Plan, which together include all proposed site improvements, the existing and proposed stormwater management system, and the location and design of all structural erosion and sediment control measures. The Department of Community Development and Planning's Site Plan Review Submission Checklist does indicate that proposed developments shall seek to retain stormwater on site to the maximum extent possible, incorporating best practices in stormwater management and low impact design technique. Section 7.2 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicates that the Stormwater Management Report shall include a "narrative describing the proposed stormwater management system, including all proposed LID techniques and BMPs incorporated in the project design." Section 10.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control discusses construction inspections, indicating at what stages the Department of Public Works will inspect the project site. Section 10.2 requires that the Department of Public Works "inspect the project site at the following stages, at a minimum: • Initial Site inspection: prior to approval of any plan; • Erosion Control Inspection: An inspection to ensure that erosion control practices are in accordance with the approved Erosion and Sediment Control Plan. Such inspection must be made prior to commencement of any earth moving activity; • Completion of site clearing; • Close of the construction season; westonandsampson.com 3-5 Weston ®Sampson STORMWATER MANAGEMENT PLAN • Stormwater Management System Inspection: An inspection will be made of the completed stormwater management system, prior to backfilling of any underground drainage or stormwater conveyance structures; and • Final Inspection: After completion of all work and stabilization of all soils, the Department of Public Works or an authorized agent shall perform an inspection of the system." The Rules and Regulations indicate that the Department of Public Works conducts inspections. Section 6.3.4 of the Town's Rules and Regulations also indicates that the Department of Public Works may "engage the employment of outside consultants for specific expert services deemed necessary by the Department." This includes site inspections. Section 6.0 of the Town's Ordinance establishing Requirements for Stormwater Management and Erosion Control grants the Department of Public Works the authority to enforce the Ordinance and the Rules and Regulations by issuing orders, violation notices, and enforcement orders, as well as pursuing all available civil and criminal remedies for such violations. On their website, the DPW has a link that allows the public to report any problems or concerns they may have with activities or conditions at construction sites. 3.3.2 Post -Construction Stormwater Management The 2016 MS4 Permit builds on the requirements of the 2003 MS4 Permit for post construction runoff from new development and redevelopment and requires the following (Year 2 requirements): Low Impact Development Permit Requirement: Low Impact Development (LID) site planning and design strategies must be used to the maximum extent feasible. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 7.2 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicates that the Stormwater Management Report shall include a "narrative describing the proposed stormwater management system, including all proposed LID techniques and BMPs incorporated in the project design." Section 8.2 indicates that the Maximum Extent Practicable shall mean that "applicants have made a complete evaluation of possible stormwater management measures which could be used on -site, including environmentally sensitive site design that minimizes land disturbance and impervious surfaces, employs LID techniques, and implements stormwater BMPs." Furthermore, Section 8.4 indicates that "the Town shall determine that the retention standard has been met to the Maximum Extent Practicable when "appropriate measures to reduce stormwater runoff from the site have been provided through better site design practices, such as removing extraneous parking, reconfigured required parking, minimizing the use of impervious materials and providing enhanced vegetation... and appropriate measures have been taken to apply LID techniques for runoff reduction. Measures such as, but not limited to, porous pavement, green roofs, rain gardens, bioretention areas, and rainwater harvesting and reuse have been considered." Under Section 9.3, Closed Drainage System, the Town's Rules and Regulations indicate that LID practices are encourages when feasible. .................................................................................................................................................................... westonandsampson.com 3-6 Weston ®Sampson STORMWATER MANAGEMENT PLAN BMP Design Guidance Permit Requirement: The design of treatment and infiltration practices should follow the guidance in Volume 2 of the Massachusetts Stormwater Handbook, as amended, or other federally or State approved BMP design guidance. Recommended Modification: Section 9.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate that "all stormwater management systems shall be designed in accordance with the Massachusetts Stormwater Management Standards (except as stricter regulations outlined herein apply), regardless of the size of the development and whether or not it falls within the jurisdiction of the Massachusetts Wetlands Protection Act." The Town should consider amending this statement to indicate that "all stormwater management systems shall be designed in accordance with the Massachusetts Stormwater Management Standards and Volume 2 of the Massachusetts Stormwater Handbook." Section 9.4 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate under Stormwater Infiltration System Design and Calculations that "all stormwater infiltration systems shall be designed in accordance with the design standards listed in Volume 3 of the Massachusetts Stormwater Management Standards, except as modified herein..." The Town should revise this statement to reference Volume 2 of the Massachusetts Stormwater Handbook. Compliance with the Stormwater Management Standards for New Development Permit Requirement: Stormwater Management systems on new development sites shall be designed to: • Not allow new stormwater conveyances to discharge untreated stormwater in accordance with Massachusetts Stormwater Handbook Standard 1; • Control peak runoff rates in accordance with Massachusetts Stormwater Handbook Standard 2; • Recharge groundwater in accordance with Massachusetts Stormwater Handbook Standard 3; • Eliminate or reduce the discharge of pollutants from land uses with higher pollutant loads as defined in the Massachusetts Stormwater Handbook in accordance with Massachusetts Stormwater Handbook Standard 5; • Protect Zone 2 or Interim Wellhead Protection Areas of public water supplies in accordance with Massachusetts Stormwater Handbook Standard 6; • Implement long term maintenance practices in accordance with Massachusetts Stormwater Handbook Standard 9; • Require that all stormwater management systems be designed to: 1. Retain the volume of runoff equivalent to, or greater than, one (1) inch multiplied by the total post -construction impervious surface area on the site; AND/OR 2. Remove 90% of the average annual load of TSS generated from the total post - construction impervious surface area on the site AND 60 % of the average annual load .................................................................................................................................................................... westonandsampson.com 3.7 Weston ®Sampson STORMWATER MANAGEMENT PLAN of TP generated from the post -construction impervious surface area on the site. Pollutant removal shall be calculated consistent with EPA Region 1 's Evaluation tool provided by EPA Region 1, where available. If EPA Region 1 tools do not address the planned or installed BMP performance any federally or State approved BMP design guidance or performance standards may be used to calculated BMP performance. Recommended Modification: Section 8.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate that "at a minimum, all projects must comply with the performance standards of the Massachusetts Stormwater Management Standards. For all new development and redevelopment projects, stormwater management systems must meet the Town's retention standard, and be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm. The Town recognizes that site constraints may make it difficult to retain all stormwater on -site. The Town has established certain criteria for determining whether the retention standard has been met to the Maximum Extent Practicable. This criterion includes that the design provides for treatment of all runoff from existing (as well as new) impervious areas to achieve the 80% TSS removal rate specified in the Massachusetts Stormwater Management Policy. The Town should amend this statement to include the following: For new development projects, stormwater management systems are designed to retain the volume of runoff equivalent to, or greater than, one (1) inch multiplied by the total post -construction impervious surface area on the site; and/or remove 90% of the average annual load of TSS generated from the total post -construction impervious surface area on the site and 60 % of the average annual load of Total Phosphorus generated from the post - construction impervious surface area on the site. Pollutant removal shall be consistent with EPA Region 1's Evaluation tool. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 9.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate that "all stormwater management systems shall be designed in accordance with the Massachusetts Stormwater Management Standards (except as stricter regulations outlined herein apply), regardless of the size of the development and whether or not it falls within the jurisdiction of the Massachusetts Wetlands Protection Act." Compliance with the Stormwater Management Standards for Redevelopment Permit Requirement: Stormwater management systems on redevelopment sites shall meet the following standards to the maximum extent feasible: • Not allow new stormwater conveyances to discharge untreated stormwater in accordance with Massachusetts Stormwater Handbook Standard 1; • Control peak runoff rates in accordance with Massachusetts Stormwater Handbook Standard 2; • Recharge groundwater in accordance with Massachusetts Stormwater Handbook Standard 3; • The pretreatment and structural best management practices requirements of Standards 5 (eliminate or reduce the discharge of pollutants from land uses with higher pollutant loads as defined in the Massachusetts Stormwater Handbook) and 6 (protect Zone 2 or Interim westonandsampson.com 3-8 Weston ®Sampson STORMWATER MANAGEMENT PLAN Wellhead Protection Areas of public water supplies in accordance with Massachusetts Stormwater Handbook Standard 6); Stormwater management systems on redevelopment sites shall also improve existing conditions by requiring that stormwater management systems be designed to: 1. Retain the volume of runoff equivalent to, or greater than 0.8 inch multiplied by the total post -construction impervious surface area on the site; AND/OR 2. Remove 80% of the average annual post -construction load of TSS generated from the total post -construction impervious area on the site AND 50% of the average annual load of TP generated from the total post -construction impervious surface area on the site. Pollutant removal shall be calculated consistent with EPA Region 1's Evaluation tool provided by EPA Region 1, where available. If EPA Region 1 tools do not address the planned or installed BMP performance any federally or State approved BMP design guidance or performance standards may be used to calculated BMP performance. • Stormwater management systems on redevelopment sites may utilize offsite mitigation within the same USGS HUC 10 as the redevelopment site to meet the equivalent retention or pollutant removal requirements indicated above. Recommended Modification: Section 8.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate that "at a minimum, all projects must comply with the performance standards of the Massachusetts Stormwater Management Standards. For all new development and redevelopment projects, stormwater management systems must meet the Town's retention standard, and be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm. The Town recognizes that site constraints may make it difficult to retain all stormwater on -site. The Town has established certain criteria for determining whether the retention standard has been met to the Maximum Extent Practicable. This criterion includes that the design provides for treatment of all runoff from existing (as well as new) impervious areas to achieve the 80% TSS removal rate specified in the Massachusetts Stormwater Management Policy. The Town should amend this statement to include the following: For redevelopment projects, stormwater management systems are designed to retain the volume of runoff equivalent to, or greater than 0.8 inch multiplied by the total post -construction impervious surface area on the site; and/or remove 80% of the average annual load of TSS generated from the total post -construction impervious surface area on the site and 50 % of the average annual load of Total Phosphorus generated from the post -construction impervious surface area on the site. Pollutant removal shall be consistent with EPA Region 1's Evaluation tool. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 8.6 of the Town's Rules & Regulations for Stormwater Management and Erosion Control discusses off -site work, and indicates that "in the event that all stormwater runoff cannot be retained on -site, the Department of Public Works may permit BMPs to be implemented at other locations, preferably within the same drainage area as the original project. Provisions for off -site work in lieu of full on -site retention may be made only for redevelopment projects." westonandsampson.com 3-9 Weston ®Sampson STORMWATER MANAGEMENT PLAN Section 9.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control indicate that "all stormwater management systems shall be designed in accordance with the Massachusetts Stormwater Management Standards (except as stricter regulations outlined herein apply), regardless of the size of the development and whether or not it falls within the jurisdiction of the Massachusetts Wetlands Protection Act." Permit Requirement: Redevelopment activities that are exclusively limited to maintenance and improvement of existing roadways, (including widening less than a single lane, adding shoulders, correcting substandard intersections, improving existing drainage systems, and repaving projects) shall improve existing conditions where feasible and are exempt from any of the parts listed previously in part d. Roadway widening or improvements that increase the amount of impervious area on the redevelopment site by greater than or equal to a single lane width shall meet the requirements of part d fully. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 98.01.C. of the Town's Ordinance establishing Requirements for Stormwater Management and Erosion Control lists those activities that are exempt from the requirements of the ordinance. This includes overlaying of existing pavement, where there is no increase in impervious area. The Town also exempts the maintenance, repair or replacement of existing drainage infrastructure where the drainage area remains the same, and there is no increase in the size or capacity of the existing pipe. The Town exempts the normal maintenance of town -owned public land, rights -of -way, public utilities and appurtenances, including roadway reconstruction. Some of these exemptions are stricter than the permit currently requires as the MS4 permit currently exempts roadway widening or improvements that increase the amount of impervious area on the redevelopment site by less than a single lane width, including adding shoulders. Submission of As-Builts Permit Requirement: The permittee shall require, at a minimum, the submission of as -built drawings no later than two (2) years after completion of construction projects. The as -built drawings must depict all on site controls, both structural and non-structural, designed to manage the stormwater associated with the completed site (post construction stormwater management). Excerpts from Watertown's Regulations that Support Permit Requirement: Section 11.0 of the Town's Rules & Regulations for Stormwater Management and Erosion Control discusses as -built plan requirements. Section 11.1 states that "no later than one year following completion of work, the Permittee, or its agent, shall submit to the Department of Public Works a final As -built Plan showing the actual as -built location and profile of all streets, ways, and utilities, including those installed by others, such as the gas, electric, telephone, and cable companies. The final plan must, at a minimum, contain the following information: • Name, seal, and signature of the Surveyor who performed the survey; • Date(s) of the survey; • Reference to the approved site plan, if any, including information regarding weather the plan is on record at the Middlesex South County Registry of Deeds or Land Court; • All streets, ways, and utilities, including those installed by others; • Rim elevation, location, size, length, slope type, and inverts for all drainage and sewer structures and pipes, including roof drains; .................................................................................................................................................................... westonandsampson.com 3-10 Weston ®Sampson STORMWATER MANAGEMENT PLAN • Location, size, and type of all structural BMPs, including, where applicable, the number and bottom elevation of infiltration units or stormwater storage chambers; the bottom elevation depth, length, and width of crushed stone surrounding underground infiltration systems; location of all clean -outs; the actual dimensions of any inlet/outlet control structures, and the invert elevation, size, slope, and type of all orifices, weirds, inlet and outlet pipe, structures, and headwalls; • Final, stabilized site topography at one -foot contour intervals for all surface retention/detention basins, drainage swales, or other stormwater management facilities. Additional spot grades should be provided as appropriate to confirm that the systems are constructed as designed. The invert elevation, size, and type of all orifices, weirds, inlet and outlet pipes, headwall structures, and emergency spillways also shall be provided, as well as the actual dimensions for any inlet/outlet control structures; • Location of all buildings, structures, pervious and impervious surfaces, roads, driveways, sidewalks, patios, walls, fences, trees, and other significant landscaping features; • Curbing type; and • Any other features that are deemed required to ensure compliance with any conditions imposed by the Department of Public Works. Section 11.2 requires that all as -built plans include a certification statement indicating that the "as - built plans accurately reflects the conditions as they exist on the property.... and the development has been constructed substantially in accordance with the approved Stormwater Management Plan and meets the requirements of the Stormwater Management and Erosion Control Permit." Long-term Operation & Maintenance Permit Requirement: The new development/redevelopment program shall have procedures to ensure adequate long-term operation and maintenance of stormwater management practices that are put in place after the completion of a construction project. These procedures may include the use of dedicated funds or escrow accounts for development projects or the acceptance of ownership by the permittee of all privately owned BMPs. These procedures may also include the development of maintenance contracts between the owner of the BMP and the permittee. Alternatively, these procedures may include the submission of an annual certification documenting the work that has been done over the last 12 months to properly operate and maintain the stormwater control measures. The procedures to require submission of as -built drawings and ensure long term operation and maintenances shall be a part of the SWMP. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 7.6 of the Town's Rules & Regulations for Stormwater Management and Erosion Control require the development of "an Operation and Maintenance (O&M) Plan, in accordance with the Massachusetts Stormwater Management Standards... the purpose of the plan is to identify the actions necessary to ensure that stormwater management systems and BMPs function as designed, in perpetuity." Per Section 7.6.1 of the Town's Rules & Regulations for Stormwater Management and Erosion Control, at a minimum, the plan shall include the following: • The location of all stormwater management system components and all discharge points. • A description of all BMPs, including proper operating parameters and how the Owner will determine if a BMP is not functioning properly. • A description of long-term source control and pollution prevention measures. .................................................................................................................................................................... westonandsampson.com 3-11 Weston ®Sampson STORMWATER MANAGEMENT PLAN • An inspection log and a description of all inspection and maintenance procedures, responsibilities, and frequencies. • Snow storage procedures and locations in accordance with the MassDEP Snow Disposal Guidance, dated March 8, 2001, as amended. • The name(s) of the Owner of all components of the system, and the name(s) and address(es) of the Responsible Party for O&M of each component, if different from the Owner. • A list of easements held to access any BMPs. • A copy of the As -built Plan. • An estimated O&M budget. Per Section 7.6.2 of the Town's Rules & Regulations for Stormwater Management and Erosion Control, "parties responsible for the O&M of the stormwater management system and BMPs shall keep records of all inspections, maintenance, and repairs and shall retain the records for at least five (5) years. These records shall be made available to the Department of Public Works during inspection of the stormwater management structure or system and at other reasonable times upon request. The Town reserves the right to request written records, including receipts of inspection or cleaning services, documenting the maintenance of the system, and/or to physically inspect the systems to ensure that the proper maintenance has been carried out. The failure of the Responsible Party or Owner to maintain the stormwater management system in reasonable order and condition, in conformance with the approved Operation and Maintenances Plan, shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 6.0 of the Ordinance." Section 6.0 of the Town's Ordinance establishing Requirements for Stormwater Management and Erosion Control grants the Department of Public Works the authority to enforce the Ordinance and the Rules and Regulations by issuing orders, violation notices, and enforcement orders, as well as pursuing all available civil and criminal remedies for such violations. Per Section 7.6.3 of the Town's Rules & Regulations for Stormwater Management and Erosion Control, "the Owner(s) of the stormwater management system must notify to the Department of Public Works of changes in ownership or assignment of financial responsibility for O&M of the stormwater infrastructure and management system or any changes to the Operation and Maintenance Plan. This shall be an on -going requirement of any Stormwater Management and Erosion Control Permit issued." Charles River Phosphorous Impairment Permit Requirement: For discharges to water quality limited water bodies and their tributaries where phosphorous is the cause of the impairment, the Town's regulatory mechanism for Stormwater Management in New Development and Redevelopment (Year 2 Permit Requirement), shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for phosphorus removal. Excerpts from Watertown's Regulations that Support Permit Requirement: Section 8.1 of the Town's Rules & Regulations for Stormwater Management and Erosion Control states that "for all new development and redevelopment projects, stormwater management systems must be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable (MEP). The purpose of this policy is to provide reductions in stormwater flows to enhance the function of the westonandsampson.com 3-12 Weston ®Sampson STORMWATER MANAGEMENT PLAN MS4, to reduce the loading of pollutants in the MS4, to support compliance with the Final Phosphorous Total Maximum Daily Load (TMDL) Report of the Charles River Basin, and to reduce water quality impairments. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm." Recommended Modification: The Town may want to consider adding language that any BMPs installed be optimized for phosphorous removal and also have a methodology in place for evaluating BMP performance. Under Section 8.4.8, include the following statement, "To support compliance with the Charles River Watershed TMDL and the Town's MS4 Permit, all BMPs must be optimized for the removal of phosphorous. The justification and design of such BMPs must also include a methodology for assessing BMP performance. Pollutant removal shall be consistent with EPA Region 1's Evaluation tool." Charles River Oil and Grease Impairment Permit Requirement: For discharges to water quality limited water bodies and their tributaries where oil and grease is the cause of the impairment, the Town's regulatory mechanism for Stormwater Management in New Development and Redevelopment (Year 2 Permit Requirement), shall include a requirement that all new development and redevelopment stormwater management BMPs located on commercial or industrial land incorporate designs that allow for shutdown and containment to isolate the drainage system in the event of an emergency spill or other unexpected event. EPA also encourages the Town to require that any BMPs designed to infiltrate stormwater on commercial and industrial sites be designed to obtain a level of pollutant removal that is equal to or greater than the level of pollutant removal provided by a comparable biofiltration system treating the same volume of runoff. Recommended Modification: The Town's Rules & Regulations for Stormwater Management and Erosion Control should be updated to include the following statement, "To support compliance with the Town's MS4 Permit, all new development and redevelopment stormwater management BMPs located on commercial or industrial land must incorporate designs that allow for shutdown and containment to isolate the drainage system in the event of an emergency spill or other unexpected event. .................................................................................................................................................................... westonandsampson.com 3-13 Weston ®Sampson STORMWATER MANAGEMENT PLAN 4.0 IDDE MONITORING AND PROGRESS 4.1 IDDE Plan In June of 2006, the Town of Watertown developed and implemented an Illicit Discharge Detection and Elimination (IDDE) Plan in response to an EPA Administrative Order concerning non-stormwater discharges from the MS4 and its tributaries to the Charles River. An addendum was later prepared to the IDDE Plan in November 2011. The purpose of the plan was to create a methodology for investigating the municipal storm drain system, identifying illicit connections, and removing identified sources of illicit discharge. The 2016 MS4 Permit defines an illicit discharge "as any discharge to a municipal separate storm sewer that is not composed entirely of stormwater" including, but not limited to: • Fixed point source discharges such as illegal/improper sanitary or floor drain connections, and cross connections between the sanitary and drainage infrastructure, • Isolated or recurring discharges such as illegal dumping and improper disposal of waste from boats, and • Indirect sources that infiltrate into the drainage system through cracks/defects in infrastructure, such as sanitary wastes from failing sewer pipes. Exceptions do exist in the regulation for the discharge of clean water from sources such as water line flushing, fire -fighting operations, non -contact cooling waters, and for other discharges that have separately obtained a permit from the NPDES Program. The Town has prepared an Amendment to the IDDE Plan to ensure compliance with the requirements set forth in the 2016 MS4 Permit to include all new sampling parameters and methodology for testing, screening requirements, and all information required to report any found illicit connections. The Town has already assessed within existing catchments the potential for illicit discharges by obtaining and evaluating data regarding the following: • Sensitivity or critical nature of the receiving water or environment • Severity of the illicit connection indicator parameters • Potential for direct or indirect public exposure • Areas with chronic problems and inadequate level of service • Areas proposed for infrastructure capital improvements Since the Town has already ranked and prioritized their catchments for investigation, most notably based on available outfall sampling data, the Town has a strong understanding of problem catchment areas. To complete an additional ranking exercise seems redundant and priority for ongoing investigations is being assigned to outfalls as determined by the criteria above, and available outfall sampling data. .................................................................................................................................................................... westonandsampson.com 4-1 Weston ®Sampson STORMWATER MANAGEMENT PLAN 4.1.1 Mapping The Town's entire drainage system has been mapped, outfalls have been identified, and interconnections have been located. Each outfall and interconnection have been analyzed to create a defined catchment area that includes the portion of Town that contributes drainage from catch basins and overland flow to that outfall. Field reconnaissance was performed to determine that the Town has approximately: • 55 miles of conduit/piping ranging in size from 8-inches in diameter to 9x10-foot diameter culverts with materials of clay, concrete, reinforced concrete, plastic, and stone, • 3,700 catch basins, • 1,900 storm drain manholes, • 33 municipal outfalls, and 7 interconnections with neighboring municipalities. Mapping has been in accordance with the 2016 MS4 Permit's GPS accuracy guidelines and has been recorded on a publicly available Town map, the most recent version of which can be found at the end of Section 1.0. When mapping the Town's infrastructure, the following considerations were included: 1. Pipe sizes, 2. Sanitary sewer location, 3. Direction of flow, 4. Rim elevations and a few select manhole invert elevations, 5. Siphon locations, 6. MWRA interceptor alignments and connection points, 7. Intermunicipal connections, 8. Pipe ownership, 9. SSO locations, 10. Common trench manholes and major crossings, 11. Inadequate LOS, 12. Landfills, Treatment facilities, or disposal facilities, 13. Hazmat corridors and facilities, 14. Facilities with SWPPPs, 15. CERCLA and RCRA regulated facilities, 16. Sites with NPDES permits for discharge of stormwater or process water, and 17. Gas stations and other high -density generating sites. 4.1.2 Sampling and Analysis In 2006, Watertown began annual monitoring of municipal stormwater outfalls. The monitoring consisted of inspection and, if appropriate, sampling of discharges at each outfall during alternating dry and wet -weather conditions every quarter. Intermunicipal connections are also a part of this program. For the testing purposes, a dry -weather period is defined as a minimum of 48 hours without precipitation. All outfalls are inspected for the presence of dry weather flow at the time of monitoring. For both dry and wet weather monitoring, samples are collected and analyzed by field kit for ammonia nitrogen, surfactants, total chlorine, and ortho- phosphates using colorimetric field kits. .................................................................................................................................................................... westonandsampson.com 4-2 Weston ®Sampson STORMWATER MANAGEMENT PLAN Specific conductivity and pH are also recorded for each sample using a handheld meter. Laboratory samples are collected and tested for Escherichia coli (E. Coli). Visual observations are also recorded. All samples are analyzed, and that data is tabulated and submitted to EPA on a quarterly basis. 4.1.3 Field Investigation The scope of field investigation in support of Watertown's IDDE Plan has been determined based on -site specific factors including the size, density, and land uses in the tributary drainage area for each outfall; the configuration and total footage of drainage pipe in the tributary area; the specific pollutants identified during monitoring, and other influences. All field investigation techniques are performed in accordance with standards put forth by the EPA New England IDDE Protocol. Watertown has employed the following techniques while performing field investigations: Dissemination of public notices to explain the potential need to gain access to property in order to investigate and repair the illicit source, The upper -most manhole is sampled for presence of the pollutant, either on site if enough flow is present, or after 48 hours of being dammed with a sand -bag to allow for the accumulation of flow. The tributary drainage system that shows the presence of the pollutant is investigated with various methods including: o CCTV inspection — drain pipes are internally inspected to pinpoint and evaluate connections utilizing a closed-circuit television (CCTV) camera through all or a portion of the drain segment supposed to be containing the connection. Inspection of the sewer system may also be performed using CCTV equipment, particularly where sewer and drain pipes are in close horizontal and/or vertical proximity. o Smoke testing — non -toxic smoke is introduced into drainage segments containing suspected illicit discharges and adjacent buildings are observed for signs of a connection, or smoke emanating from floor drains or sump pump connections. o Dye testing — dyed water is poured into plumbing fixtures and downstream drainage is observed to confirm connections. If an illicit discharge is found and within the Town's right-of-way, then the connection is removed, documented, and reported in the quarterly report to EPA. Post -illicit connection removal verification testing is also performed to ensure that the source of the contamination was removed. All findings from the Town's investigation are reflected on the Town's drainage mapping. Any discharges located outside of the Town's jurisdiction are served a notice. 4.1.4 Sanitary Sewer Overflows Under the permit, the Town is required to develop a list of Sanitary Sewer Overflows (SSOs) that have occurred within the last 5 years. There were three SSOs that have occurred in the last 5 years: • On January 6, 2016, an SSO was called in by a resident on Riverside Ave. near Wheeler Lane. The overflow was believed to be caused by a blockage in the sewer siphon crossing North Beacon Street at Riverside Ave. The sewer mains and siphon were jetted with a vacuum truck, the sumps of all catch basins were vacuumed and all surcharged manholes were cleaned. Additional heavy cleaning of the sanitary sewer siphon was performed by an .................................................................................................................................................................... westonandsampson.com 4-3 Weston ®Sampson STORMWATER MANAGEMENT PLAN outside contractor. The volume of the sanitary sewer overflow was estimated to be 100 gallons into a nearby catch basin. • The second overflow occurred on January 16, 2019 on Greenough Boulevard. Flow discharged overland from a sewer manhole and then entered the Charles River via surface runoff. The volume of the sanitary sewer overflow was estimated to be 100 gallons. The sanitary sewer overflow was believed to be the result of a grease blockage within the sewer. The sewer main was jetted with a vacuum truck, and grease control product was added to an upstream manhole. • The third overflow occurred on March 18, 2019 on Wheeler Lane at Charles River Road. Flow discharged from the sewer manhole and potentially discharged to the Charles River via the drainage system on Wheeler Lane. The sanitary sewer overflow was estimated to be 10 to 15 gallons and was the result of grease blockage within the sewer. The sewer main was jetted with a vacuum truck and grease control product was added to an upstream manhole. The sumps of the catch basins were cleaned. In the event of an overflow or bypass, the Town recognizes that a notification must be reported within 24 hours by phone to MassDEP, EPA, and other relevant parties. Verbal notification must also be followed by a written report in accordance with MassDEP's Sanitary Sewer Overflow (SSO)/Bypass notification form within five (5) calendar days of becoming aware of the overflow, bypass, or backup. westonandsampson.com 4-4 Weston®Sampson STORMWATER MANAGEMENT PLAN 5.0 STANDARD OPERATING PROCEDURES 5.1 MS4 Permit Requirement As part of the minimum control measure for Pollution Prevention/Good Housekeeping for Municipal Operations, the MS4 Permit requires permittees to implement an Operations and Maintenance (O&M) program for permittee-owned facilities and activities to prevent or reduce pollutant runoff and protect water quality. The O&M Program is required to include the following elements: 1) An inventory of all permittee-owned facilities. 2) Written O&M procedures for the following activities: a. Parks and open space b. Buildings and facilities where pollutants are exposed to runoff c. Vehicles and equipment 3) A written program detailing the activities and procedures the permittee will implement so that MS4 infrastructure is maintained in a timely manner to reduce the discharge of pollutants from the MS4, to include: a. Optimization of routine inspections, cleaning and maintenance of catch basins. b. Implementation of procedures for sweeping and/or cleaning streets, and permittee- owned parking lots. c. Proper storage and disposal of catch basin cleanings and street sweepings. d. Implementation of procedures for winter road maintenance. e. Implementation of inspection and maintenance frequencies and procedures for storm drain systems and stormwater treatment structures. 4) Written records for all maintenance activities, inspections and training. 5.2 Inventory of Municipal Facilities During Permit Year 2, the Town will develop an inventory of municipal facilities and incorporate herein. 5.3 Operation and Maintenance Procedures for Municipal Activities and Facilities To address the MS4 Permit requirements, Standard Operating Procedures (SOPs) associated with the identified municipal activities and facilities are required to be developed within two years of the permit effective date, with the exception of procedures for winter road maintenance, which are required to be developed within one year of the permit effective date. The SOP for winter road maintenance, which includes snow removal and deicing, will be incorporated into Appendix I, along with additional SOPs that are developed during Permit Year 2. 5.4 Catch Basin Cleaning and Optimization The Town currently has approximately 3,200 catch basins, which are cleaned on an annual basis. The Town contracts out catch basin cleaning to a private company, which is responsible for cleaning each basin and disposing of the accumulated sediments in accordance with state and local westonandsampson.com 5-1 Weston ®Sampson STORMWATER MANAGEMENT PLAN requirements. Currently, catch basin cleaning is performed with a bucket attachment. Cleaning occurs town -wide, typically during summer or late summer. Outside of annual cleaning, the DPW performs catch basin cleaning in response to complaints or inquiries using a vacuum machine. To meet anticipated requirements of the new MS4 Permit, the Town will need to optimize catch basin inspection, cleaning and maintenance such that the following conditions are met: • Inspection and maintenance of catch basins located near construction activities (roadway construction, residential, commercial, or industrial development or redevelopment) are prioritized. Catch basins in such areas must be cleaned more frequently if inspection and maintenance activities indicate excessive sediment or debris loading. • A schedule must be established such that the frequency of routine cleaning ensures that no catch basin at any time will be more than 50 percent full. A catch basin sump is more than 50 percent full if the contents within the sump exceed one half the distance between the bottom interior of the catch basin to the invert of the deepest outlet of the catch basin. • If a catch basin sump is more than 50 percent full during two consecutive routine inspections/cleaning events, the Town must document the finding, investigate the contributing drainage area for sources of excessive sediment loading, and to the extent practicable, abate contributing sources. • The Town shall maintain documentation, including metrics and other information, used to reach the determination that the established plan for cleaning and maintenance is optimal and meets the requirements of the MS4 Permit, including a log of catch basins cleaned and inspected. • The Town must continue to track and report the following information to EPA annually: o Total number of catch basins town -wide o Number of catch basins inspected o Number of catch basins cleaned o Total volume or mass of material removed from all catch basins The Town will collect additional data during the 2019 cleaning season as part of their optimization plan to ensure that no catch basin is more than 50% full. Data collected will include depth from the catch basin rim to the top of water, to the top of sediment, to the bottom of the basin, and to the invert of the outlet pipe. Data will again be collected during the 2020 catch basin cleaning season, including depth from the rim to the top of water and from the rim to the top of sediment. This data will be integrated into the Town's GIS and utilized to identify those catch basins that are filling up more frequently, and will therefore need to be cleaned more than once annually to ensure that that catch basin sump is never more than 50% full. .................................................................................................................................................................... westonandsampson.com 5-2 Weston ®Sampson STORMWATER MANAGEMENT PLAN 6.0 TMDLS AND WATER QUALITY LIMITED WATERS 6.1 Discharges to Water Quality Limited Waters Under Massachusetts General Law (MGL) Chapter 21, MassDEP is responsible for monitoring the waters of the Commonwealth, identifying those waters that are impaired, and developing a plan to bring them back into compliance with Massachusetts Surface Water Quality Standards. The list of impaired waters, better known as the "303(d) list," identifies impaired surface waters and the reasons for impairment. Once a waterbody is identified as impaired, MassDEP is required by the Federal Clean Water Act (CWA) to develop a strategy for restoring the health of the impaired waterbody. The process of developing this strategy, which is generally referred to as a Total Maximum Daily Load (TMDL) includes identifying the type of pollutant, and the potential sources of the pollutant, in addition to determining the maximum amount of pollutant that can be discharged to a specific surface water body in order to meet surface water quality standards. Part of the TMDL also includes the development of a plan to help in meeting the Total Maximum Daily Load limits once they have been established. These impaired waters are listed under Category 4A in Part 2 of the Massachusetts Integrated List of Waters. There are currently three approved TMDLs that are applicable to Watertown — all of which focus on bacteria and phosphorus impairments within the Charles River. These include the Pathogen TMDL for the Charles River Watershed, the Final Total Maximum Daily Load (TMDL) for Nutrients in the Lower Charles River Basin and the Total Maximum Daily Load for Nutrients in the Upper/Middle Charles River In addition to identifying water bodies for which a Total Maximum Daily Load has already been developed, the Integrated List of Waters also identifies the 303(d) List of Impaired Waters under Category 5. The 303(d) List identifies water bodies that are impaired or threatened for one or more designated uses and require a TMDL. In Watertown, this includes segment MA72-36 of the Charles River for oil and grease; an unnamed tributary (MA72-30), locally known as Laundry Brook, for Total Suspended Solids and turbidity; and Alewife Brook for E.coli and phosphorus. 6.2 Bacteria/Pathogens Impairments There are two water bodies in Watertown that are covered under the Pathogen TMDL for the Charles River Watershed, which was approved in January 2007. These include the Charles River and an unnamed tributary to the Charles River along Arsenal Street and Coolidge Avenue locally known as Sawins Brook. Alewife Brook is also impaired for bacteria, and requires the development of a TMDL. There are a total of 32 regulated outfalls that discharge into the Charles River and there is one outfall that discharges to Sawins Brook that need to be monitored under the IDDE plan. Watertown also has one interconnection which discharges to Belmont within the Mystic River Watershed. The priority ranking has been determined by a comprehensive matrix, taking numerous factors into account including but not limited to: sensitivity or critical nature of the receiving water or environment, severity of the illicit connection indicator parameters, potential for direct or indirect public exposure, areas with chronic problems and inadequate level of service, areas proposed for infrastructure capital improvements. The priority status of those outfalls has been determined by the progress achieved since the IDDE program westonandsampson.com 6-1 Weston ®Sampson STORMWATER MANAGEMENT PLAN begin in 2006. A priority ranking system would be redundant in Watertown, and investigative priority will be given to those outfalls and interconnections which show any sign of illicit connection over the course of routine testing that Watertown has engaged in to date. As of April 2019, the following outfalls are under active investigation by the Town: 6, 8, 11, 18, 20, 36, 99, 109, and BEL. The following outfalls have been considered swept and cleared as of April, 2019: 5, 33, CAMB, and NEWT. By area, approximately 53% of the Town's system is currently under investigation. 6.2.1 Public Education and Outreach The Town has a robust public education program for multiple purposes and has easily been able to add in specific, targeted information regarding actions that can be taken to reduce sources of bacteria and nutrients from the priority outfalls listed above. Included in the Watertown Animal Control ordinance is the stipulation that all dogs, cats, and other large agricultural animals require a license obtained by the town clerk. Upon receiving or renewing that license, the Town will distribute a pamphlet explaining the important highlights of the ordinance, including keeping pet waste out of drainage areas and other public areas. The Town also has a "Clean Water Pledge" that explains the importance of having clean stormwater runoff and ways that the Town could contribute to keeping the Town's waterways clean. The Town clerk could 1) hand this pledge out with the pamphlet or 2) alter and amend the current pamphlet to include specific stormwater information about e. coli impairments in the Charles River and the direct relationship to incorrect pet waste disposal. In the most recent annual report filed under the 2003 MS4 permit, the Town reported that they had created the brochure depicting the importance of and proper methods of pet waste disposal. They have made this information available to the public at the Health Department, on their website, and have begun the practice of targeting distribution to residents that are observed to be in violation of the animal control ordinance. They have also set a goal to more strictly enforce pet waste management rules through the issuance of fines. 6.3 Phosphorus Impairments The entirety of the Charles River is impaired for phosphorus. In October 17, 2007, EPA approved the Final Total Maximum Daily Load (TMDL) for Nutrients in the Lower Charles River Basin and on June 10, 2011 the Total Maximum Daily Load for Nutrients in the Upper/Middle Charles River was approved. To address phosphorus in stormwater discharges and meet the waste load allocations outlined in these TMDLs, a Phosphorus Control Plan will need to be developed and implemented within 20 years of the permit effective date. The permit indicates that Watertown will have to reduce its phosphorus load by 52% to meet the established waste load allocation in these TMDLs. Watertown's baseline phosphorus load is 1,127 kg/yr. The required phosphorus load reduction is 582 kg/yr to arrive at an allowable phosphorus load of 545 kg/yr. The waste load allocation is to be obtained through implementation of several structural and non-structural BMPs outlined in a three-phase Phosphorous Control Plan. The 2016 MS4 Permit lists Watertown as a municipality requiring compliance with the two approved phosphorus TMDLs and as having a phosphorus impairment without an approved TMDL. This phosphorus impairment without an approved TMDL refers to the Mystic River and Laundry Brook. The Town has one catchment that discharges to the Mystic River via an interconnection with Belmont, but westonandsampson.com 6.2 Weston ®Sampson STORMWATER MANAGEMENT PLAN does not have any outfalls that discharge to Laundry Brook In lieu of developing a Phosphorus Source Identification Report for the catchment area tributary to the Mystic River, the Town plans to develop and implement the Phosphorus Control Plan town -wide. To comply with the Phosphorus TMDL and the 2016 MS4 General Permit, there are multiple Best Management Practices that need to be implemented within 20 years of the permit effective date. Listed below are the requirements by permit year and associated town specific BMPs to meet them. 6.3.1 Phosphorus Control Plan In addition to the extra control measures listed above, the Town must create and implement a three-part Phosphorus Control Plan according to the schedule outlined below. • Create a Phase 1 Phosphorus Control Plan within 5 years of the permit effective date • Implement the Phase 1 Phosphorous Control Plan and create a Phase 2 Phosphorous Control Plan within 5 years of the permit effective date. • Implement the Phase 2 Phosphorus Control Plan and create a Phase 3 Phosphorus Control Plan within 15 years of the permit effective date • Implement the Phase 3 Phosphorous Control Plan within 20 years of the permit effective date. 6.3.2 Phase 1 Phase 1 of the Phosphorus Control Plan shall be drafted within 5 years of the permit effective date. It must include each of the following components to be completed by the dates associated with them: Table 6-1: Phosphorus Control Plan Phase 1 Components Le -gal _ Analysis - The Town must perform an assessment to ensure that the existing regulatory mechanisms of the Town support implementation of the PCP and update or create any bylaws and ordinances to effectively enact the entire plan. Funding Source Assessment - The Town must describe all possible current and anticipated mechanisms that would be used to fund the PCP. The Town must describe in detail the steps taken to obtain such funding which may include conceptual development, outreach to affected parties, and development of legal authorities. Define Scope of PCP - The Town must define the project area as either the entire area within the Town's jurisdiction or by all the urbanized area within the Town's jurisdiction that falls within the Charles River Watershed. In Watertown's case, these are the same area. Within the PCP Area: • The Baseline Phosphorus Load is 1,127 kg/yr • The Stormwater Phosphorus Load Reduction Requirement is 582 kg/yr • The Allowable Phosphorus Load is 545 kg/yr • The Stormwater Percent Reduction in Phosphorus Load is 52% 2 years after the effective permit date - FY2020 3 years after the effective permit date - FY2021 4 years after the effective permit date - FY2022 westonandsampson.com 6-3 Weston®Sampson STORMWATER MANAGEMENT PLAN Describe Non -Structural Controls - The Town must describe all non- structural controls to be implemented in the PCP. It must be detailed to include the planned measures, the area of implementation, and the 5 years after the annual percent reduction expected from the BMPs effect. To calculate effective permit date - expected rate of phosphorus exported (P,,p), add the Allowable FY2023 Phosphorus Load (PQl�ow) to the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.8 P,, < P,11,w + (PRR x 0. 8). Describe Structural Controls - The Town will perform a ranking assessment to determine priority areas to retrofit or develop structural BMPs to address phosphorus discharge. It must be detailed to include the planned measures, the area of implementation, and the annual percent reduction expected from the BMPs effect. To calculate expected 5 years after the rate of phosphorus exported (Pexp), add the Allowable Phosphorus Load effective permit date - (P ) to the applicable Phosphorus Reduction Requirement(PRR)FY2023 auow pp P q multiplied by 0.75 P,,p < Pallow + (PRR x 0. 75). If the Town decides to hire a contractor to install the chosen BMP, that third parry can be included in the plan as well. Describe Operation and Maintenance Programs - The Town will detail an operation and maintenance plan for each of the structural BMPs including 5 years after the an inspection and maintenance schedule specific to the BMP design or effective permit date - manufacturer specification and the responsible parry for carrying out the FY2023 plan. Phase 1 Implementation Schedule - A schedule for implementation of all planned Phase 1 BMPs including: obtaining funding, training, purchasing, construction, inspections, monitoring, operation and maintenance, and other assessment and evaluation components of 5 years after the implementation. All non-structural BMPs must be adopted 6 years after effective permit date - the effective date of the permit, all structural BMPs must be adopted to FY2023 adhere to the phosphorus removal milestones in year 8 and 10, and the full plan must be implemented no later than 10 years after the effective date of the permit. Estimated Cost -The Town must estimate the cost of implementing all 5 years after the aspects of the Phase 1 plan. This will confirm the validity the funding effective permit date - source assessment completed in year 3. FY2023 Complete Written Phase - The Town must complete the written Phase 1 5 years after the plan no later than 5 years after the permit's effective date. The EPA effective permit date - encourages the Town to post the drafted plan online to allow for public FY2023 involvement. Full Implementation of Non -Structural Controls - The Town must have fully implemented and evaluated the effectiveness of all non-structural 6 years after the BMPs by 6 years after the permit effective date by the method described effective permit date - above. All performance evaluations for each BMP will be included as an FY2024 appendix to this report. Performance Evaluation.- the Town will continue monitoring non- 6 and 7 years after the structural BMPs for their effectiveness at removing Phosphorus. effective permit date - FY2024-2025 westonandsampson.com 6-4 Weston®Sampson STORMWATER MANAGEMENT PLAN Full Implementation of Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the effectiveness 8 years after the of all -structural BMPs by 8 years after the permit effective date by the effective permit date - method described above. All performance evaluations for each BMP will FY2026 be included as an appendix to this report. Performance Evaluation - the Town will continue monitoring non- 9 years after the structural and structural BMPs for their effectiveness at removing effective permit date - Phosphorus. FY2027 Full Implementation of Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the effectiveness 10 years after the of all BMPs by 10 years after the permit effective date by the method effective permit date - described above. All performance evaluations for each BMP will be FY2028 included as an appendix to this report. 6.3.3 Phase 2 Phase 2 of the Phosphorus Control Plan shall be completed no later than 10 years after the effective permit date and contain all the following components: Table 6-2: Phosphorus Control Plan Phase 2 Components PCP Phase 2 Component Completion Date Legal Analysis - Update any analysis performed for Phase 1 to include any new or augmented bylaws, ordinances, or funding mechanisms As necessary deemed necessary to enact in order to complete the PCP. Describe Planned Non -Structural Controls - The Town must describe all new non-structural controls to be implemented in the PCP to reach the new reduction milestone set forth by the permit. It must be detailed to include the planned measures, the area of implementation, and the 10 years after the annual percent reduction expected from the BMP's effect. To calculate effective permit date - expected rate of phosphorus exported (P,,p), add the Allowable FY2028 Phosphorus Load (Pai�oW) to the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.65 Pex < P,11,w + (PRR x 0. 65). Describe Planned Structural Controls - The Town must describe all new structural controls to be implemented in the PCP to reach the new reduction milestone set forth by the permit. It must be detailed to include the planned measures, the area of implementation, and the annual 10 years after the percent reduction expected from the BMPs effect. To calculate expected effective permit date - rate of phosphorus exported (P,p), add the Allowable Phosphorus Load FY2028 (Pal,oW) to the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.50 P,, < P,11,w + (PRR x 0. 50). Update Operation and Maintenance Plan - The Town will detail an 10 years after the operation and maintenance plan for each of the structural BMPs including effective permit date - an inspection and maintenance schedule specific to the BMP design or FY2028 .................................................................................................................................................................... westonandsampson.com 6-5 Weston®Sampson STORMWATER MANAGEMENT PLAN manufacturer specification and the responsible party for carrying out the plan. Phase 2 Implementation Schedule - A schedule for implementation of all planned Phase 2 BMPs including: obtaining funding, training, purchasing, construction, inspections, monitoring, operation and 10 years after the maintenance, and other assessment and evaluation components of effective permit date — implementation. All structural BMPs must be adopted to adhere to the FY2028 phosphorus removal milestones in year 13 and 15, and the full plan must be implemented no later than 15 years after the effective date of the permit. Estimated Cost - The Town must estimate the cost of implementing all 10 years after the aspects of the Phase 2 plan including installing any new BMPs and effective permit date — creating an ongoing operation and maintenance plan. FY2028 Complete Written Phase - The Town must complete the written Phase 2 10 years after the plan no later than 10 years after the permit's effective date. The EPA effective permit date — encourages the Town to post the drafted plan online to allow for public FY2028 involvement. Performance Evaluation - The Town will continue monitoring non- 11 and 12 years after the structural BMPs for their effectiveness at removing Phosphorus. effective permit date — FY2029- 2030 Full Implementation of Non- Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the 13 years after the effectiveness of all non-structural BMPs by 13 years after the permit effective permit date — effective date by the method described above. All performance FY2031 evaluations for each BMP will be included as an appendix to this report. Performance Evaluation - The Town will continue monitoring non- 14 years after the structural BMPs for their effectiveness at removing Phosphorus. effective permit date — FY2032 Full Implementation of Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the effectiveness 15 years after the of all BMPs by 15 years after the permit effective date by the method effective permit date — described above. All performance evaluations for each BMP will be FY2033 included as an appendix to this report. 6.3.4 Phase 3 Phase 3 of the Phosphorus Control Plan shall be completed no later than 15 years after the permit effective date. It shall be fully implemented no later than 20 years after the permit effective date, and contain the following components. Table 6-3: Phosphorus Control Plan Phase 3 Components PCP Phase 3 ComponenLZ:> Completion Date _egal Analysis - Update any analysis performed for Phase 1 and 2 to 'nclude any new or augmented bylaws, ordinances, or funding As necessary. 'nechanisms deemed necessary to enact in order to complete the PCP. .......................... westonandsampson.com ........................................ Weston®Sampson STORMWATER MANAGEMENT PLAN Describe Planned Non -Structural Controls - The Town must describe all new non-structural controls to be implemented in the PCP to reach the new reduction milestone set forth by the permit. It must be detailed to include the planned measures, the area of implementation, and the 15 years after the annual percent reduction expected from the BMP's effect. To calculate effective permit date - expected rate of phosphorus exported (P,,p), add the Allowable FY2033 Phosphorus Load (Pallow) to the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.30: Pex < Pallow + (PRR x 0.30). Describe Planned Structural Controls - The Town must describe all new structural controls to be implemented in the PCP to reach the new reduction milestone set forth by the permit. It must be detailed to include the planned measures, the area of implementation, and the annual 15 years after the percent reduction expected from the BMPs effect. To calculate expected effective permit date - rate of phosphorus exported (Pexp), add the Allowable Phosphorus Load FY2033 (Pallow) to the applicable Phosphorus Reduction Requirement (PRR) Pexp G Pallow + PRR- Update Operation and Maintenance Plan - The Town will detail an operation and maintenance plan for each of the structural BMPs including 15 years after the an inspection and maintenance schedule specific to the BMP design or effective permit date - manufacturer specification and the responsible party for carrying out the FY2033 plan. Phase 3 Implementation Schedule - A schedule for implementation of all planned Phase 3 BMPs including: obtaining funding, training, purchasing, construction, inspections, monitoring, operation and 15 years after the maintenance, and other assessment and evaluation components of effective permit date - implementation. All structural BMPs must be adopted to adhere to the FY2033 phosphorus removal milestones in year 18 and 20, and the full plan must be implemented no later than 20 years after the effective date of the permit. Estimated Cost - The Town must estimate the cost of implementing all 15 years after the aspects of the Phase 2 plan including installing any new BMPs and effective permit date - creating an ongoing operation and maintenance plan. FY2033 Complete Written Phase - The Town must complete the written Phase 3 15 years after the plan no later than 15 years after the permit's effective date. The EPA effective permit date - encourages the Town to post the drafted plan online to allow for public FY2033 involvement. Performance Evaluation.- The Town will continue monitoring non- 16 and 17 years after the structural BMPs for their effectiveness at removing Phosphorus. effective permit date - FY2034-2035 Full Implementation of Non- Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the 18 years after the effectiveness of all non-structural BMPs by 18 years after the permit effective permit date - effective date by the method described above. All performance FY2036 evaluations for each BMP will be included as an appendix to this report. Performance Evaluation - The Town will continue monitoring non- 19 years after the structural BMPs for their effectiveness at removing Phosphorus. effective permit date - FY2037 westonandsampson.com 6-7 Weston®Sampson TOWN OF WATERTOWNYSTORMWATER MANAGEMENT PLAN Full Implementation of Structural Controls and Performance Evaluation - The Town must have fully implemented and evaluated the effectiveness 20 years after the of all BMPs by 20 years after the permit effective date by the method effective permit date — described above. All performance evaluations for each BMP will be FY2038 included as an appendix to this report. 6.4 Oil and Grease, TSS and Turbidity Impairments Impaired waters in Watertown without an approved TMDL for a specific impairment (that could be related to stormwater discharges) include segment MA72-36 of the Charles River for oil and grease and an unnamed tributary (MA72-30), locally known as Laundry Brook, for Total Suspended Solids and turbidity. Since there are no discharges to the unknown tributary locally known as Laundry Brook, the Town is not required to implement the impaired waters requirements of the permit related to TSS and turbidity. However, the Town is required to comply with the impaired waters requirements for oil and grease for the Charles River. The Town's Stormwater Management and Erosion Control Rules and Regulations must include a requirement that for new development and redevelopment, stormwater management systems designed on commercial and industrial land use areas draining to impaired waters incorporate spill containment isolation. Street sweeping and catch basin cleaning must also be increased in high density tributary areas as needed. The Town currently sweeps all main streets and major arterial streets more than twice per year. All other streets are swept twice per year. Catch basins are cleaned every other year. This street sweeping and catch basin cleaning frequency may be adequate to meet the conditions of the permit. westonandsampson.com 6-8 Weston®Sampson STORMWATER MANAGEMENT PLAN 7.0 REPORTING, EVALUATION AND MODIFICATION 7.1 MS4 Permit Reporting The MS4 Permit requires submission of annual reports assessing the effectiveness of the proposed BMPs and reporting if the minimum control measures were met. The initial report is due 90 days from the close of the reporting period, or September 30', 2019, and annually thereafter. Reports are to be submitted to both EPA and MADEP. At a minimum, the report should include the following: • The status of compliance with permit conditions, including an assessment of the appropriateness of the selected BMPs and progress toward achieving the selected measurable goals for each minimum control measure. • Results of any information collected and analyzed, including monitoring data, if any. Outfall screening and monitoring data collected shall be submitted for both the reporting cycle and cumulative for the permit term. • A summary of the stormwater activities planned for the next reporting cycle. • A change in any identified best management practices or measurable goals for any minimum control measure. • Notice of relying on another governmental entity to satisfy some of the permit obligations, if applicable. As indicated in an earlier section, copies of past annual reports submitted by Watertown are referenced in Appendix E of this SWMP. Watertown will append future annual reports in compliance with the 2016 MS4 Permit as they are prepared in Appendix J. 7.2 Evaluation of SWMP Success This SWMP should be considered a dynamic document that is modified as necessary to account for changes such as in drainage infrastructure, laws and regulations, and Town leadership and policy. The success of programs implemented by the SWMP — such as IDDE — should also be evaluated to ensure that they are accomplishing the goals for which they were intended and in a method and timetable that continues to be appropriate. In addition, the SWMP should be reviewed and revised as necessary to keep text and appendices current. For example: • After each year of stormwater monitoring to update appended findings and priorities. • As needed to keep appended IDDE investigation, identification and removal documentation current. • After each NPDES stormwater permit renewal to incorporate new requirements, as well as append copies of new permits and associated Notices of Intent (NOls). .................................................................................................................................................................... westonandsampson.com .,, 7_1 Weston ®Sampson TOWN OF WATERTOWNYSTORMWATER MANAGEMENT PLAN • After adoption of any new or revised ordinances or other regulatory mechanisms related to stormwater or drainage infrastructure. Watertown undertook this SWMP, in part, in order to ensure the protection of its water resources and the large investment in drainage infrastructure. Periodic review and revision of this written document will help achieve these goals on a perpetual basis. 7.3 Modifications to the SWMP or Notice of Intent As discussed above, minor modifications to this SWMP should be made on a regular and frequent basis to keep it current. However, major changes to the SWMP or needed modifications to the NOI for inclusion under the NPDES Permit require an official process. In accordance with the MS4 Permit, modifications to the SWMP or NOI may be made under the following provisions: • At any time, the Town may add (but not subtract or replace) components, controls or requirements to the SWMP. • The Town may request to replace an ineffective or infeasible BMP specifically identified in the SWMP with an alternative BMP at any time as long as the basis for the change is documented in the SWMP by, at a minimum: o An analysis of why the BMP is ineffective or infeasible (or cost prohibitive). o Expectations on the effectiveness of the replacement BMP. o An analysis of why the replacement BMP is expected to achieve the goals of the BMP to be replaced. • The Town shall indicate BMP modifications along with a brief explanation of the modification in each Annual Report. At this time, Watertown does not anticipate any major modifications to the SWMP or NOI requiring official notification. .................................................................................................................................................................... westonandsampson.com 7.2 Weston®Sampson STORMWATER MANAGEMENT PLAN _-- ► • I -11 Abbreviations and Definitions .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN ABBREVIATIONS AND DEFINITIONS Best Management Practices (BMPs) - schedules of activities, practices (and prohibitions of practices), structures, vegetation, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants to waters of the United States. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. Common Plan of Development - A "larger common plan of development or sale" is a contiguous area where multiple separate and distinct construction activities may be taking place at different times different schedules under one plan. For example, if developer buys a 20-acre lot and builds roads, installs pipes, and runs electricity with the intention of constructing homes or other structures sometime in the future, this would be considered a larger common plan of development or sale. If the land is parceled off or sold, and construction occurs on plots that are less than one acre by separate, independent builders, this activity still would be subject to stormwater permitting requirements if the smaller plots were included on the original site plan. Control Measure - refers to any BMP or other method (including effluent limitations) used to prevent or reduce the discharge of pollutants to waters of the United States. Director - a Regional Administrator of the Environmental Protection Agency or an authorized representative. Discharge - when used without qualification, means the "discharge of a pollutant." Discharge of a pollutant - any addition of any "pollutant" or combination of pollutants to "waters of the United States" from any "point source," or any addition of any pollutant or combination of pollutants to the waters of the "contiguous zone" or the ocean from any point source other than a vessel or other floating craft which is being used as a means of transportation. This includes additions of pollutants into waters of the United States from surface runoff which is collected or channeled by man; or discharges through pipes, sewers, or other conveyances, leading into privately owned treatment works. Discharge -related activities - activities which cause, contribute to, or result in stormwater and allowable non-stormwater point source discharges, and measures such as the siting, construction and operation of BMPs to control, reduce, or prevent pollution in the discharges. Disturbance - action to alter the existing vegetation and/or underlying soil of a site, such as clearing, grading, site preparation (e.g., excavating, cutting, and filling), soil compaction, and movement and stockpiling of top soils. Existing Discharger — an operator applying for coverage under this permit for discharges covered previously under an NPDES general or individual permit. Facility or Activity - any NPDES "point source" or any other facility or activity (including land or appurtenances thereto) that is subject to regulation under the NPDES program. .................................................................................................................................................................. westonandsampson.com Weston ®Sampson STORMWATER MANAGEMENT PLAN Federal Facility — Any buildings, installations, structures, land, public works, equipment, aircraft, vessels, and other vehicles and property, owned by, or constructed or manufactured for the purpose of leasing to, the federal government. Illicit Discharge - any discharge to a municipal separate storm sewer that is not composed entirely of stormwater except discharges pursuant to a NPDES permit (other than the NPDES permit for discharges from the municipal separate storm sewer) and discharges resulting from fire fighting activities. Impaired Water — A water is impaired if it does not meet one or more of its designated use(s). For purposes of this permit, "impaired" refers to categories 4 and 5 of the five -part categorization approach used for classifying the water quality standards attainment status for water segments under the TMDL program. Impaired waters compilations are also sometimes referred to as "303(d) lists." Category 5 waters are impaired because at least one designated use is not being supported or is threatened and a TMDL is needed. Category 4 waters indicate that at least one designated use is not being supported but a TMDL is not needed (4a indicates that a TMDL has been approved or established by EPA; 4b indicates other required control measures are expected in result in the attainment of water quality standards in a reasonable period of time; and 4c indicates that the nonattainment of the water quality standard is the result of pollution (e.g. habitat) and is not caused by a pollutant). See USEPA's 2006 Integrated Report Guidance, July 29, 2005 for more detail on the five -part categorization of waters [under EPA National TMDL Guidance http://www.epa.gov/owow/tmdl/policy.htmID. Impervious Surface- Any surface that prevents or significantly impedes the infiltration of water into the underlying soil. This can include but is not limited to: roads, driveways, parking areas and other areas created using non porous material; buildings, rooftops, structures, artificial turf and compacted gravel or soil. Industrial Activity - the ten categories of industrial activities included in the definition of "stormwater discharges associated with industrial activity," as defined in 40 CFR 122.26(b)(14)(i)-(ix) and (xi). Industrial Stormwater - stormwater runoff associated with the definition of "stormwater discharges associated with industrial activity." Interconnection — the point (excluding sheet flow over impervious surfaces) where the permittee's MS4 discharges to another MS4 or other storm sewer system, through which the discharge is eventually conveyed to a water of the United States. Interconnections shall be treated similarly to outfalls throughout the permit. Junction Manhole - For the purposes of this permit, a junction manhole is a manhole or structure with two or more inlets accepting flow from two or more MS4 alignments. Manholes with inlets solely from private storm drains, individual catch basins, or both are not considered junction manholes for these purposes. Key Junction Manhole - For the purposes of this permit, key junction manholes are those junction manholes that can represent one or more junction manholes without compromising adequate .................................................................................................................................................................. westonandsampson.com Weston ®Sampson STORMWATER MANAGEMENT PLAN implementation of the illicit discharge program. Adequate implementation of the illicit discharge program would not be compromised if the exclusion of a particular junction manhole as a key junction manhole would not affect the permittee's ability to determine the possible presence of an upstream illicit discharge. A permittee may exclude a junction manhole located upstream from another located in the immediate vicinity or that is serving a drainage alignment with no potential for illicit connections. Municipal Separate Storm Sewer - a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, manmade channels, or storm drains):(i) Owned or operated by a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States; (ii) Designed or used for collecting or conveying stormwater;(iii) Which is not a combined sewer; and (iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2. Municipal Separate Storm Sewer System (MS4) - means all separate storm sewers that are defined as "large" or "medium" or "small" municipal storm sewer systems pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). For the purposes of this permit "MS4" may also refer to the permittee with jurisdiction over the sewer system. New Development — any construction activities or land alteration resulting in total earth disturbances greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) on an area that has not previously been developed to include impervious cover. (see part 2.3.6. of the permit) New Discharger — For the purposes of this permit, a new discharger is an entity that discharges stormwater from a new facility with an entirely new separate storm sewer system that is not physically located on the same or adjacent land as an existing facility and associated system operated by the same MS4. New Source - any building, structure, facility, or installation from which there is or may be a "discharge of pollutants," the construction of which commenced: • after promulgation of standards of performance under section 306 of the CWA which are applicable to such source, or • after proposal of standards of performance in accordance with section 306 of the CWA which are applicable to such source, but only if the standards are promulgated in accordance with section 306 within 120 days of their proposal. No exposure - all industrial materials or activities are protected by a storm -resistant shelter to prevent exposure to rain, snow, snowmelt, and/or runoff. One Lane Width — The width of the travel lane for a roadway. Lane width does not include shoulders, curbs, and on -street parking areas. westonandsampson.com Weston ®Sampson STORMWATER MANAGEMENT PLAN Outfall Catchment - The land area draining to a single outfall or interconnection. The extent of an outfall's catchment is determined not only by localized topography and impervious cover but also by the location of drainage structures and the connectivity of MS4 pipes. Owner or operator - the owner or operator of any "facility or activity" subject to regulation under the NPDES program. Person - an individual, association, partnership, corporation, municipality, State or Federal agency, or an agent or employee thereof. Point source - any discernible, confined, and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill leachate collection system, vessel, or other floating craft from which pollutants are or may be discharged. This term does not include return flows from irrigated agriculture or agricultural stormwater runoff. Pollutant - dredged spoil, solid waste, incinerator residue, filter backwash, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial, municipal and agricultural waste discharged into water. Pollutant of concern -A pollutant which causes or contributes to a violation of a water quality standard, including a pollutant which is identified as causing an impairment in a State's 303(d) list. Redevelopment - for the purposes of part 2.3.6., any construction, land alteration, or improvement of impervious surfaces resulting in total earth disturbances greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) that does not meet the definition of new development (see above). Runoff coefficient - the fraction of total rainfall that will appear at the conveyance as runoff. Site - for the purposes of part 2.3.6., the area extent of construction activities, including but not limited to the creation of new impervious cover and improvement of existing impervious cover (e.g. repaving not covered by 2.3.6.a.ii.4.d.) Small Municipal Separate Storm Sewer System - all separate storm sewer systems that are (i) owned or operated by the United States, a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under State law such as a sewer district, flood control district, or drainage district, or similar entity or an Indian tribe or an authorized Indian tribal organization or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States, and (ii) not defined as "large" or "medium" municipal separate storm sewer system pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). This term includes systems similar to separate storm sewer systems in municipalities, such as systems at military bases, large hospital or prison complexes, and highways and other thoroughfares. This term does not include separate storm sewers in very discrete areas, such as individual buildings. westonandsampson.com Weston ®Sampson STORMWATER MANAGEMENT PLAN Small MS4 - means a small municipal separate storm sewer system. Stormwater - stormwater runoff, snow melt runoff, and surface runoff and drainage. Stormwater Discharges Associated with Construction Activity - a discharge of pollutants in stormwater runoff from areas where soil disturbing activities (e.g., clearing, grading, or excavating), construction materials, or equipment storage or maintenance (e.g., fill piles, borrow areas, concrete truck washout, fueling), or other industrial stormwater directly related to the construction process (e.g., concrete or asphalt batch plants) are located. (See 40 CFR 122.26(b)(14)(x) and 40 CFR 122.26(b)(15). Stormwater Discharges Associated with Industrial Activity - the discharge from any conveyance that is used for collecting and conveying stormwater and that is directly related to manufacturing, processing or raw materials storage areas at an industrial plant. The term does not include discharges from facilities or activities excluded from the NPDES program under Part 122. For the categories of industries identified in this section, the term includes, but is not limited to, stormwater discharges from industrial plant yards; immediate access roads and rail lines used or traveled by carriers of raw materials, manufactured products, waste material, or by-products used or created by the facility; material handling sites; refuse sites; sites used for the application or disposal of process waste water (as defined at part 401 of this chapter); sites used for the storage and maintenance of material handling equipment; sites used for residual treatment, storage, or disposal; shipping and receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and intermediate and final products; and areas where industrial activity has taken place in the past and significant materials remain and are exposed to stormwater. For the purposes of this paragraph, material handling activities include storage, loading and unloading, transportation, or conveyance of any raw material, intermediate product, final product, by-product or waste product. The term excludes areas located on plant lands separate from the plant's industrial activities, such as office buildings and accompanying parking lots as long as the drainage from the excluded areas is not mixed with stormwater drained from the above described areas. Industrial facilities include those that are federally, State, or municipally owned or operated that meet the description of the facilities listed in Appendix D of the 2016 MS4 Permit. The term also includes those facilities designated under the provisions of 40 CFR 122.26(a)(1)(v). Total Maximum Daily Loads (TMDLs) - A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL includes wasteload allocations (WLAs) for point source discharges, load allocations (LAs) for nonpoint sources and/or natural background, and must include a margin of safety (MOS) and account for seasonal variations. (See section 303(d) of the Clean Water Act and 40 CFR 130.2 and 130.7). Urbanized Area - US Census designated area comprised of a densely settled core of census tracts and/or census blocks that meet minimum population density requirements, along with adjacent territory containing non-residential urban land uses as well as territory with low population density included to link outlying densely settled territory with the densely settled core. For the purposes of this permit, Urbanized Areas as defined by any Census since 2000 remain subject to stormwater regulation even if there is a change in the reach of the Urbanized Area because of a change in more recent Census data. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN Water Quality Limited Water - for the purposes of this permit, a water quality limited water is any waterbody that does not meet applicable water quality standards, including but not limited to waters listed in categories 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b). Water Quality Standards - A water quality standard defines the water quality goals of a water body, or portion thereof, by designating the use or uses to be made of the water and by setting criteria necessary to protect the uses. States and EPA adopt WQS to protect public health or welfare, enhance the quality of water and serve the purposes of the Clean Water Act (See CWA sections 101(a)2 and 303(c)). ABBREVIATIONS AND ACRONYMS BMP - Best Management Practice BPJ - Best Professional Judgment CGP - Construction General Permit CWA - Clean Water Act (or the Federal Water Pollution Control Act, 33 U.S.C. §1251 et seq) DCIA- Directly Connected Impervious Area EPA - U. S. Environmental Protection Agency ESA - Endangered Species Act USFWS - U. S. Fish and Wildlife Service IA - Impervious Area IDDE - Illicit Discharge Detection and Elimination LA - Load Allocations MS4 - Municipal Separate Storm Sewer System MSGP - Multi -Sector General Permit NHPA - National Historic Preservation Act NMFS - U. S. National Marine Fisheries Service NOI - Notice of Intent NPDES - National Pollutant Discharge Elimination System NRHP - National Register of Historic Places NSPS - New Source Performance Standard PCP - Phosphorus Control Plan SHPO - State Historic Preservation Officer SPCC - Spill Prevention, Control, and Countermeasure SWMP - Stormwater Management Program SWPPP - Stormwater Pollution Prevention Plan TMDL -Total Maximum Daily Load TSS -Total Suspended Solids WLA - Wasteload Allocation WQS - Water Quality Standard westonandsampson.com Weston ®Sampson STORMWATER MANAGEMENT PLAN Regulated Area Map .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX C 2016 MS4 Permit .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX D 2016 MS4 Notice of Intent .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX E 2003 MS4 Annual Reports Reference westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX F MS4 Checklists by Permit Year .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX G Public Education Materials .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX H Regulatory Mechanisms westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX I Standard Operating Procedures .................................................................................................................................................................. westonandsampson.com Weston®Sampson STORMWATER MANAGEMENT PLAN APPENDIX J 2016 MS4 Annual Reports westonandsampson.com Weston®Sampson Weston ®Sampson 55 Walkers Brook Drive STORMWATER Reading, MA 01867 tel: 978.532.1900 ...................................................................................................................................................................... MANAr--"EMENT ................................................................................... AI .AN APPENDICES MS4 GENERAL PERMIT COMPLIANCE JUNE 2019 TOWN OF Watertown MASSACHUSETTS A- 1 I. APPENDICES Abbreviations and Definitions .................................................................................................................................................................. westonandsampson.com Weston ® Sampson ABBREVIATIONS AND DEFINITIONS Best Management Practices (BMPs) - schedules of activities, practices (and prohibitions of practices), structures, vegetation, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants to waters of the United States. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. Common Plan of Development - A "larger common plan of development or sale" is a contiguous area where multiple separate and distinct construction activities may be taking place at different times different schedules under one plan. For example, if developer buys a 20-acre lot and builds roads, installs pipes, and runs electricity with the intention of constructing homes or other structures sometime in the future, this would be considered a larger common plan of development or sale. If the land is parceled off or sold, and construction occurs on plots that are less than one acre by separate, independent builders, this activity still would be subject to stormwater permitting requirements if the smaller plots were included on the original site plan. Control Measure - refers to any BMP or other method (including effluent limitations) used to prevent or reduce the discharge of pollutants to waters of the United States. Director - a Regional Administrator of the Environmental Protection Agency or an authorized representative. Discharge - when used without qualification, means the "discharge of a pollutant." Discharge of a pollutant - any addition of any "pollutant" or combination of pollutants to "waters of the United States" from any "point source," or any addition of any pollutant or combination of pollutants to the waters of the "contiguous zone" or the ocean from any point source other than a vessel or other floating craft which is being used as a means of transportation. This includes additions of pollutants into waters of the United States from surface runoff which is collected or channeled by man; or discharges through pipes, sewers, or other conveyances, leading into privately owned treatment works. Discharge -related activities - activities which cause, contribute to, or result in stormwater and allowable non-stormwater point source discharges, and measures such as the siting, construction and operation of BMPs to control, reduce, or prevent pollution in the discharges. Disturbance - action to alter the existing vegetation and/or underlying soil of a site, such as clearing, grading, site preparation (e.g., excavating, cutting, and filling), soil compaction, and movement and stockpiling of top soils. Existing Discharger - an operator applying for coverage under this permit for discharges covered previously under an NPDES general or individual permit. Facility or Activity - any NPDES "point source" or any other facility or activity (including land or appurtenances thereto) that is subject to regulation under the NPDES program. .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Federal Facility — Any buildings, installations, structures, land, public works, equipment, aircraft, vessels, and other vehicles and property, owned by, or constructed or manufactured for the purpose of leasing to, the federal government. Illicit Discharge - any discharge to a municipal separate storm sewer that is not composed entirely of stormwater except discharges pursuant to a NPDES permit (other than the NPDES permit for discharges from the municipal separate storm sewer) and discharges resulting from fire fighting activities. Impaired Water — A water is impaired if it does not meet one or more of its designated use(s). For purposes of this permit, "impaired" refers to categories 4 and 5 of the five -part categorization approach used for classifying the water quality standards attainment status for water segments under the TMDL program. Impaired waters compilations are also sometimes referred to as "303(d) lists." Category 5 waters are impaired because at least one designated use is not being supported or is threatened and a TMDL is needed. Category 4 waters indicate that at least one designated use is not being supported but a TMDL is not needed (4a indicates that a TMDL has been approved or established by EPA; 4b indicates other required control measures are expected in result in the attainment of water quality standards in a reasonable period of time; and 4c indicates that the nonattainment of the water quality standard is the result of pollution (e.g. habitat) and is not caused by a pollutant). See USEPA's 2006 Integrated Report Guidance, July 29, 2005 for more detail on the five -part categorization of waters [under EPA National TMDL Guidance http://www.epa.gov/owow/tmdl/policy.html]). Impervious Surface- Any surface that prevents or significantly impedes the infiltration of water into the underlying soil. This can include but is not limited to: roads, driveways, parking areas and other areas created using non porous material; buildings, rooftops, structures, artificial turf and compacted gravel or soil. Industrial Activity - the ten categories of industrial activities included in the definition of "stormwater discharges associated with industrial activity," as defined in 40 CFR 122.26(b)(14)(i)-(ix) and (xi). Industrial Stormwater - stormwater runoff associated with the definition of "stormwater discharges associated with industrial activity." Interconnection — the point (excluding sheet flow over impervious surfaces) where the permittee's MS4 discharges to another MS4 or other storm sewer system, through which the discharge is eventually conveyed to a water of the United States. Interconnections shall be treated similarly to outfalls throughout the permit. Junction Manhole - For the purposes of this permit, a junction manhole is a manhole or structure with two or more inlets accepting flow from two or more MS4 alignments. Manholes with inlets solely from private storm drains, individual catch basins, or both are not considered junction manholes for these purposes. Key Junction Manhole - For the purposes of this permit, key junction manholes are those junction manholes that can represent one or more junction manholes without compromising adequate .................................................................................................................................................................. westonandsampson.com Weston ® Sampson implementation of the illicit discharge program. Adequate implementation of the illicit discharge program would not be compromised if the exclusion of a particular junction manhole as a key junction manhole would not affect the permittee's ability to determine the possible presence of an upstream illicit discharge. A permittee may exclude a junction manhole located upstream from another located in the immediate vicinity or that is serving a drainage alignment with no potential for illicit connections. Municipal Separate Storm Sewer - a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, manmade channels, or storm drains):(i) Owned or operated by a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States; (ii) Designed or used for collecting or conveying stormwater;(iii) Which is not a combined sewer; and (iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2. Municipal Separate Storm Sewer System (MS4) - means all separate storm sewers that are defined as "large" or "medium" or "small" municipal storm sewer systems pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). For the purposes of this permit "MS4" may also refer to the permittee with jurisdiction over the sewer system. New Development - any construction activities or land alteration resulting in total earth disturbances greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) on an area that has not previously been developed to include impervious cover. (see part 2.3.6. of the permit) New Discharger - For the purposes of this permit, a new discharger is an entity that discharges stormwater from a new facility with an entirely new separate storm sewer system that is not physically located on the same or adjacent land as an existing facility and associated system operated by the same MS4. New Source - any building, structure, facility, or installation from which there is or may be a "discharge of pollutants," the construction of which commenced: • after promulgation of standards of performance under section 306 of the CWA which are applicable to such source, or • after proposal of standards of performance in accordance with section 306 of the CWA which are applicable to such source, but only if the standards are promulgated in accordance with section 306 within 120 days of their proposal. No exposure - all industrial materials or activities are protected by a storm -resistant shelter to prevent exposure to rain, snow, snowmelt, and/or runoff. One Lane Width - The width of the travel lane for a roadway. Lane width does not include shoulders, curbs, and on -street parking areas. .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Outfall Catchment - The land area draining to a single outfall or interconnection. The extent of an outfall's catchment is determined not only by localized topography and impervious cover but also by the location of drainage structures and the connectivity of MS4 pipes. Owner or operator - the owner or operator of any "facility or activity" subject to regulation under the NPDES program. Person - an individual, association, partnership, corporation, municipality, State or Federal agency, or an agent or employee thereof. Point source - any discernible, confined, and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill leachate collection system, vessel, or other floating craft from which pollutants are or may be discharged. This term does not include return flows from irrigated agriculture or agricultural stormwater runoff. Pollutant - dredged spoil, solid waste, incinerator residue, filter backwash, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial, municipal and agricultural waste discharged into water. Pollutant of concern - A pollutant which causes or contributes to a violation of a water quality standard, including a pollutant which is identified as causing an impairment in a State's 303(d) list. Redevelopment - for the purposes of part 2.3.6., any construction, land alteration, or improvement of impervious surfaces resulting in total earth disturbances greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) that does not meet the definition of new development (see above). Runoff coefficient - the fraction of total rainfall that will appear at the conveyance as runoff. Site - for the purposes of part 2.3.6., the area extent of construction activities, including but not limited to the creation of new impervious cover and improvement of existing impervious cover (e.g. repaving not covered by 2.3.6.a.ii.4.d.) Small Municipal Separate Storm Sewer System - all separate storm sewer systems that are (i) owned or operated by the United States, a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under State law such as a sewer district, flood control district, or drainage district, or similar entity or an Indian tribe or an authorized Indian tribal organization or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States, and (ii) not defined as "large" or "medium" municipal separate storm sewer system pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). This term includes systems similar to separate storm sewer systems in municipalities, such as systems at military bases, large hospital or prison complexes, and highways and other thoroughfares. This term does not include separate storm sewers in very discrete areas, such as individual buildings. .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Small MS4 - means a small municipal separate storm sewer system. Stormwater - stormwater runoff, snow melt runoff, and surface runoff and drainage. Stormwater Discharges Associated with Construction Activity - a discharge of pollutants in stormwater runoff from areas where soil disturbing activities (e.g., clearing, grading, or excavating), construction materials, or equipment storage or maintenance (e.g., fill piles, borrow areas, concrete truck washout, fueling), or other industrial stormwater directly related to the construction process (e.g., concrete or asphalt batch plants) are located. (See 40 CFR 122.26(b)(14)(x) and 40 CFR 122.26(b)(15). Stormwater Discharges Associated with Industrial Activity - the discharge from any conveyance that is used for collecting and conveying stormwater and that is directly related to manufacturing, processing or raw materials storage areas at an industrial plant. The term does not include discharges from facilities or activities excluded from the NPDES program under Part 122. For the categories of industries identified in this section, the term includes, but is not limited to, stormwater discharges from industrial plant yards; immediate access roads and rail lines used or traveled by carriers of raw materials, manufactured products, waste material, or by-products used or created by the facility; material handling sites; refuse sites; sites used for the application or disposal of process waste water (as defined at part 401 of this chapter); sites used for the storage and maintenance of material handling equipment; sites used for residual treatment, storage, or disposal; shipping and receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and intermediate and final products; and areas where industrial activity has taken place in the past and significant materials remain and are exposed to stormwater. For the purposes of this paragraph, material handling activities include storage, loading and unloading, transportation, or conveyance of any raw material, intermediate product, final product, by-product or waste product. The term excludes areas located on plant lands separate from the plant's industrial activities, such as office buildings and accompanying parking lots as long as the drainage from the excluded areas is not mixed with stormwater drained from the above described areas. Industrial facilities include those that are federally, State, or municipally owned or operated that meet the description of the facilities listed in Appendix D of the 2016 MS4 Permit. The term also includes those facilities designated under the provisions of 40 CFR 122.26(a)(1)(v). Total Maximum Daily Loads (TMDLs) - A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL includes wasteload allocations (WLAs) for point source discharges, load allocations (LAs) for nonpoint sources and/or natural background, and must include a margin of safety (MOS) and account for seasonal variations. (See section 303(d) of the Clean Water Act and 40 CFR 130.2 and 130.7). Urbanized Area - US Census designated area comprised of a densely settled core of census tracts and/or census blocks that meet minimum population density requirements, along with adjacent territory containing non-residential urban land uses as well as territory with low population density included to link outlying densely settled territory with the densely settled core. For the purposes of this permit, Urbanized Areas as defined by any Census since 2000 remain subject to stormwater regulation even if there is a change in the reach of the Urbanized Area because of a change in more recent Census data. .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Water Quality Limited Water - for the purposes of this permit, a water quality limited water is any waterbody that does not meet applicable water quality standards, including but not limited to waters listed in categories 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b). Water Quality Standards - A water quality standard defines the water quality goals of a water body, or portion thereof, by designating the use or uses to be made of the water and by setting criteria necessary to protect the uses. States and EPA adopt WQS to protect public health or welfare, enhance the quality of water and serve the purposes of the Clean Water Act (See CWA sections 101(a)2 and 303(c)). ABBREVIATIONS AND ACRONYMS BMP - Best Management Practice BPJ - Best Professional Judgment CGP - Construction General Permit CWA - Clean Water Act (or the Federal Water Pollution Control Act, 33 U.S.C. §1251 et seq) DCIA- Directly Connected Impervious Area EPA - U. S. Environmental Protection Agency ESA - Endangered Species Act USFWS - U. S. Fish and Wildlife Service IA- Impervious Area IDDE - Illicit Discharge Detection and Elimination LA - Load Allocations MS4 - Municipal Separate Storm Sewer System MSGP - Multi -Sector General Permit NHPA- National Historic Preservation Act NMFS - U. S. National Marine Fisheries Service NOI - Notice of Intent NPDES - National Pollutant Discharge Elimination System NRHP - National Register of Historic Places NSPS - New Source Performance Standard PCP - Phosphorus Control Plan SHPO - State Historic Preservation Officer SPCC - Spill Prevention, Control, and Countermeasure SWMP - Stormwater Management Program SWPPP - Stormwater Pollution Prevention Plan TMDL -Total Maximum Daily Load TSS - Total Suspended Solids WLA - Wasteload Allocation WQS - Water Quality Standard .................................................................................................................................................................. westonandsampson.com Weston ® Sampson APPENDIX B Regulated Area Map .................................................................................................................................................................. westonandsampson.com Weston ® Sampson VT NPDES Phase II Stormwater Program Automatically Designated MS4 Areas Watertown MA Regulated Area: //////."\'\"��\Vv\ UA.Based`on QUA Based'on j 00%Census 3010 Census 0 1 2 Kilometers 0 1 2 Miles Town Population: 32004 Regulated Population: 32004 (Populations estimated from 2010 Census) N -+E I EPA s Urbanized Areas, Town Boundaries: US Census (2000, 2010) Base map © 2013 Microsoft Corporation and its data suppliers US EPA Region 1 GIS Center Map #8824, 8/9/2013 APPENDIX C 2016 MS4 Permit .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Minor Permit Modification Summary The following permit has been modified in accordance with 40 CFR §122.63: Permit Name: GENERAL PERMITS FOR STORMWATER DISCHARGES FROM SMALL MUNICIPAL SEPARATE STORM SEWER SYSTEMS IN MASSACHUSETTS Issue date: April 4, 2016 Effective Date: July 1, 2018 The following minor modifications were made on November 7, 2018: Page Modification 2 Table of Contents was updated to reflect the changes below 3 Table of Contents was updated to reflect the changes below 5 Line was added before first bullet point for consistency 6 Line was removed between parts for consistency 8 Lines were added and removed between parts for consistency 8 Typos were fixed 11 Extra word was removed 11 Extra spaces were removed between words for consistency 12 Extra spaces were removed between words for consistency 12 Extra words were removed 12 Text was moved to a bullet point in the last paragraph of part 1.10.2 instead of as part of the 1.10.3 title for consistency 12 Duplicate words and symbols were deleted 13 Bullets were moved to the correct subsection, consistent with other relevant sections of the permit 14 Typos were fixed 15 Extra spaces were removed between words for consistency 16 Extra spaces were removed between words for consistency 27 Extra spaces were removed between words for consistency 27 Duplicate character was removed 29 Typo was fixed 30 Duplicate character was removed 32 Lines were added before bullet points for consistency 33 Lines were added and removed between paragraphs for consistency 34 Line was added before bullet points for consistency 34 Typo was fixed 34 Duplicate spaces were removed 35 Typo was fixed 35 Line was added before bullet points for consistency 36 Lines were added before bullet points and in between parts for consistency 37 Lines were added before bullet points and in between parts for consistency 38 Line was added in between parts for consistency 38 Typos were fixed 39 Line was added in between paragraphs for consistency 39 Typos were fixed 41 Lines were added before bullets for consistency 42 Typos were fixed 43 Typo was fixed 44 Line was added for consistency 46 Typo was fixed 50 Typo was fixed 51 Typo was fixed 54 Line was added for consistency 55 Line was added for consistency 56 Typo was fixed 56 Line was added for consistency 57 Lines were added and removed for consistency MA MS4 General Permit United States Environmental Protection Agency (EPA) National Pollutant Discharge Elimination System (NPDES) GENERAL PERMITS FOR STORMWATER DISCHARGES FROM SMALL MUNICIPAL SEPARATE STORM SEWER SYSTEMS IN MASSACHUSETTS AUTHORIZATION TO DISCHARGE UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of the Clean Water Act (CWA), as amended (33 U.S.C. §1251 et seq.), and the Massachusetts Clean Waters Act, as amended (M.G.L. Chap.21 §§ 26-53), any operator of a small municipal separate storm sewer system whose system: • Is located in the areas described in part 1.1; • Is eligible for coverage under part 1.2 and part 1.9; and • Submits a complete and accurate Notice of Intent in accordance with part 1.7 of this permit and EPA issues a written authorization is authorized to discharge in accordance with the conditions and the requirements set forth herein. The following appendices are also included as part of these permits: Appendix A — Definitions, Abbreviations, and Acronyms; Appendix B — Standard permit conditions applicable to all authorized discharges; Appendix C — Endangered Species Act Eligibility Guidance; Appendix D -- National Historic Preservation Act Eligibility Guidance; Appendix E — Information required for the Notice of Intent (NOI); Appendix F — Requirements for MA Small MS4s Subject to Approved TMDLs; Appendix G — Impaired Waters Monitoring Parameter Requirements; Appendix H — Requirements related to discharges to certain water quality limited waterbodies; These permits become effective on July 1, 2017. These permits and the authorization to discharge expire at midnight, June 30, 2022. Signed this `l day of &. Ken Moraff, Director Office of Ecosystem Protection United States Environmental Protection Agency 5 Post Office Square — Suite 100 Boston, Massachusetts 02109-3912 Signed this day f Arc,' ouglas E. Fine Assistant Commissioner for Water Resources Department of Environmental Protection One Winter Street Boston, Massachusetts 02108 MA MS4 General Permit TABLE OF CONTENTS 1.0. INTRODUCTION.......................................................................................4 1.1. AREAS OF COVERAGE........................................................................................................................4 1.2. ELIGIBILITY.......................................................................................................................................4 1.2.1. Small MS4s Covered........................................................................................................................4 1.3. LIMITATIONS ON COVERAGE.............................................................................................................5 1.4. NON-STORMWATER DISCHARGES......................................................................................................6 1.5. PERMIT COMPLIANCE........................................................................................................................6 1.6. CONTINUATION OF THIS PERMIT........................................................................................................ 6 1.7. OBTAINING AUTHORIZATION TO DISCHARGE.................................................................................... 7 1.7.1. How to Obtain Authorization to Discharge.......................................................................................7 1.7.2. Notice of Intent.................................................................................................................................7 1.7.3. Submission of Notice of Intent.........................................................................................................7 1.7.4. Public Notice of NOI and Effective Date of Coverage.....................................................................8 1.8. INDIVIDUAL PERMITS AND ALTERNATIVE GENERAL PERMITS........................................................... 8 1.9. SPECIAL ELIGIBILITY DETERMINATIONS............................................................................................9 1.9.1. Documentation Regarding Endangered Species...............................................................................9 1.9.2. Documentation Regarding Historic Properties..................................................................................9 1.10. STORMWATER MANAGEMENT PROGRAM (SWMP)......................................................................... 10 1.10.1. Stormwater Management Program Availability..............................................................................10 1.10.2. Contents and Timelines of the Stormwater Management Program for 2003 permittees.................10 1.10.3. Contents and Timelines of the Stormwater Management Program for New Permittees.................12 2.0. NON -NUMERIC EFFLUENT LIMITATIONS...........................................14 2.1. WATER QUALITY BASED EFFLUENT LIMITATIONS.......................................................................... 14 2.1.1. Requirement to Meet Water Quality Standards..............................................................................14 2.1.2. Increased Discharges.......................................................................................................................15 2.2. DISCHARGES TO CERTAIN IMPAIRED WATERS................................................................................. 16 2.2.1. Discharges Subject to Requirements Related to an Approved TMDL............................................16 2.2.2. Discharges to Certain Water Quality Limited Waters Subject to Additional Requirements ........... 22 2.3. REQUIREMENTS TO REDUCE POLLUTANTS TO THE MAXIMUM EXTENT PRACTICABLE (MEP)......... 27 2.3.1. Control Measures............................................................................................................................27 2.3.2. Public Education and Outreach.......................................................................................................27 2.3.3. Public Involvement and Participation.............................................................................................29 2.3.4. Illicit Discharge Detection and Elimination (IDDE) Program........................................................30 2.3.5. Construction Site Stormwater Runoff Control................................................................................42 2.3.6. Stormwater Management in New Development and Redevelopment (Post Construction StormwaterManagement)...............................................................................................................43 2.3.7. Good House Keeping and Pollution Prevention for Permittee Owned Operations .........................47 3.0. ADDITIONAL REQUIREMENTS FOR DISCHARGES TO SURFACE DRINKING WATER SUPPLIES AND THEIR TRIBUTARIES ...................................... 54 4.0. PROGRAM EVALUATION, RECORD KEEPING, AND REPORTING ... 54 4.1. PROGRAM EVALUATION.................................................................................................................. 54 4.2. RECORD KEEPING............................................................................................................................55 4.3. OUTFALL MONITORING REPORTING................................................................................................ 55 4.4. ANNUAL REPORTS........................................................................................................................... 56 5.0. NON-TRADITIONAL MS4S.....................................................................58 ii MA MS4 General Permit 5.1. REQUIREMENTS FOR NON-TRADITIONAL MS4S............................................................................... 58 5.1.1. Public education..............................................................................................................................58 5.1.2. Ordinances and regulatory mechanisms..........................................................................................58 5.1.3. Assessment of Regulations.............................................................................................................58 5.1.4. New Dischargers.............................................................................................................................58 6.0 REQUIREMENTS FOR MS4S OWNED OR OPERATED BY TRANSPORTATION AGENCIES................................................................................. 59 6.1 PUBLIC EDUCATION......................................................................................................................... 59 6.2 ORDINANCES AND REGULATORY MECHANISMS............................................................................... 59 6.3 ASSESSMENT OF REGULATIONS........................................................................................................ 59 6.4 NEW DISCHARGERS......................................................................................................................... 59 III MA MS4 General Permit 1.0. Introduction This document consists of three (3) general permits listed in part 1.1. Each general permit is applicable to a particular type of municipal system within Massachusetts. Many of the permit terms and conditions are applicable across all regulated entities, and therefore are presented just once in parts 1-2, part 4, and Appendices A through E. Other conditions are applicable to a particular set of authorized entities; these terms and conditions are included in parts 3, and 5 and Appendices F through H. Throughout the permit, the terms "this permit" or "the permit" will refer to the three general permits. 1.1. Areas of Coverage This permit covers small municipal separate storm sewer systems (MS4s) located in the Commonwealth of Massachusetts: • Traditional Cities and Towns (NPDES Permit No. MAR041000) • State, federal, county and other publicly owned properties (Non-traditional) (MAR042000) • State transportation agencies (except for MassDOT- Highway Division) (MAR043000) 1.2. Eligibility The MS4 shall meet the eligibility provisions described in part 1.2.1 and part 1.9 to be eligible for authorization under this permit. 1.2.1. Small MS4s Covered This permit authorizes the discharge of stormwater from small MS4s as defined at 40 CFR § 122.26(b) (16). This includes MS4s described in 40 CFR §122.32(a) (1) and (a) (2). An MS4 is eligible for coverage under this permit if it is: • A small MS4 within the Commonwealth of Massachusetts; • Not a large or medium MS4 as defined in 40 CFR § § 122.26(b)(4) or (7); • Located either fully or partially within an urbanized area as determined by the latest Decennial Census by the Bureau of Census as of the effective date of this permit (the 2010 Census); or • Located in a geographic area designated by EPA as requiring a permit. If the small MS4 is not located entirely within an urbanized area, only the portion of the MS4 that is located within the urbanized area is regulated under 40 CFR § 122.32(a) (1). A small municipal separate storm sewer system means all separate storm sewers that are: • Owned or operated by the United States, a state, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to state law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under state law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States. • Not defined as large or medium municipal separate storm sewer systems pursuant to 40 CFR § 122.26(b) (4) and (b) (7) or designated under 40 CFR § 122.26(a) (1) (v). • This term includes systems similar to separate storm sewer systems in municipalities such as systems at military bases, large hospitals or prison complexes, and highways El MA MS4 General Permit and other thoroughfares. The term does not include separate storm sewers in very discrete areas, such as individual buildings. 1.3. Limitations on Coverage This permit does not authorize the following: a. Stormwater discharges mixed with sources of non-stormwater unless such non-stormwater discharges are: • Authorized under a separate NPDES permit; or • A non-stormwater discharge as listed in part 1.4. b. Stormwater discharges associated with industrial activity as defined in 40 CFR § 122.26 (b) (14) (i)- (ix) and (xi). c. Stormwater discharges associated with construction activity as defined in 40 CFR § 122.26(b) (14) (x) or (b) (15). d. Stormwater discharges currently authorized under another NPDES permit, including discharges covered under other regionally issued general permits. e. Stormwater discharges or discharge related activities that are likely to adversely affect any species that are listed as endangered or threatened under the Endangered Species Act (ESA) or result in the adverse modification or destruction of habitat that is designated as critical under the ESA. The permittee shall follow the procedures detailed in Appendix C to make a determination regarding eligibility. The permittee shall certify compliance with this provision on the submitted NOI. f. Stormwater discharges whose direct or indirect impacts do not prevent or minimize adverse effects on any Essential Fish Habitat. g. Stormwater discharges, or implementation of a stormwater management program, which adversely affects properties listed or eligible to be listed on the National Register of Historic Places. The permittee shall follow the procedures detailed in Appendix D to make a determination regarding eligibility. The permittee shall certify compliance with this provision on the submitted NOI. h. Stormwater discharges prohibited under 40 CFR § 122.4. i. Stormwater discharges to the subsurface subject to state Underground Injection Control (UIC) regulations. Although the permit includes provisions related to infiltration and groundwater recharge, structural controls that dispose of stormwater into the ground may be subject to UIC regulation requirements. Authorization for such discharges shall be obtained from Massachusetts Department of Environmental Protection, Bureau of Resource Protection, Drinking Water Program, Underground Injection Control, One Winter Street, Boston, MA 02108 — phone 617-292-5859. j. Any non-traditional MS4 facility that is a "new discharger" as defined in part 5.1.4. and discharges to a waterbody listed in category 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b) due to nutrients (Total Nitrogen or (Total Phosphorus), metals (Cadmium, Copper, Iron, Lead or Zinc), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enteroccus or Fecal Coliform), chloride (Chloride) or oil and grease MA MS4 General Permit (Petroleum Hydrocarbons or Oil and Grease), or discharges to a waterbody with an approved TMDL for any of those pollutants. 1.4. Non-Stormwater Discharges The following categories of non-stormwater discharges are allowed under this permit unless the permittee, EPA, or the MassDEP identifies any category or individual discharge of non-stormwater discharge in part 1.4.a-r as a significant contributor of pollutants to the MS4, then that category or individual discharge is not allowed under part 1.4, but rather shall be deemed an "illicit discharge" under part 2.3.4.1, and the permittee shall address that category or individual discharge as part of the Illicit Discharge Detection and Elimination (IDDE) Program described in part 2.3.4 of this permit. a. Water line flushing b. Landscape irrigation c. Diverted stream flows d. Rising ground water e. Uncontaminated ground water infiltration (as defined at 40 CFR § 35.2005(20)) f. Uncontaminated pumped ground water g. Discharge from potable water sources h. Foundation drains i. Air conditioning condensation j. Irrigation water, springs k. Water from crawl space pumps 1. Footing drains in. Lawn watering n. Individual resident car washing o. Flows from riparian habitats and wetlands p. De -chlorinated swimming pool discharges q. Street wash waters r. Residential building wash waters without detergents Discharges or flows from firefighting activities are allowed under this permit need only be addressed where they are identified as significant sources of pollutants to waters of the United States. 1.5. Permit Compliance Non-compliance with any of the requirements of this permit constitutes a violation of the permit and the CWA and may be grounds for an enforcement action and may result in the imposition of injunctive relief and/or penalties. 1.6. Continuation of this Permit If this permit is not reissued prior to the expiration date, it will be administratively continued in accordance with the Administrative Procedure Act and remain in force and effect for discharges that were authorized prior to expiration. If a small MS4 was granted permit authorization prior to the expiration date of this permit, it will automatically remain authorized by this permit until the earliest of: • Authorization under a reissued general permit following timely and appropriate submittal of a complete and accurate NOI requesting authorization to discharge under the reissued permit; or • Issuance or denial of an individual permit for the MS4's discharges; or MA MS4 General Permit • Authorization or denial under an alternative general permit. If the MS4 operator does not submit a timely, appropriate, complete, and accurate NOI requesting authorization to discharge under the reissued permit or a timely request for authorization under an individual or alternative general permit, authorization under this permit will terminate on the due date for the NOI under the reissued permit unless otherwise specified in the reissued permit. 1.7. Obtaining Authorization to Discharge 1.7.1. How to Obtain Authorization to Discharge To obtain authorization under this permit, a small MS4 shall: • Be located in the areas listed in part 1.1 of this permit; • Meet the eligibility requirements in part 1.2 and part 1.9; • Submit a complete and accurate Notice of Intent (NOI) in accordance with the requirements of part 1.7.2; and • EPA issues a written authorization. 1.7.2. Notice of Intent a. Operators of Small MS4s seeking authorization to discharge under the terms and conditions of this permit shall submit a Notice of Intent that contains the information identified in Appendix E. This includes operators of small MS4s that were previously authorized under the May 1, 2003 small MS4 general permit (MS4-2003 permit). b. The NOI shall be signed by an appropriate official (see Appendix B, Subparagraph B.11, Standard Conditions). c. The NOI shall contain the following certification: I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, I certify that the information submitted is, to best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Print the name and title of the official, followed by signature and date. d. The NOI shall be submitted within 90 days of the effective date of the permit. If EPA notifies an MS4 that it is designated under 40 CFR § 122.32(a) (2) or (b), the NOI shall be submitted within 180 days of receipt of notice unless granted a longer period of time by EPA. 1.7.3. Submission of Notice of Intent a. All small MS4s shall submit a complete and accurate Notice of Intent (suggested form in Appendix E) to EPA -Region 1 at the following address: United States Environmental Protection Agency Stormwater and Construction Permits Section (OEP06-1) Five Post Office Square, Suite 100 MA MS4 General Permit Boston, MA 02109 Or submitted electronically to EPA at the following email address: stormwater.reportskepa.gov b. All small MS4s shall also submit a copy of the NOI to the MassDEP at the following address: Massachusetts Department of Environmental Protection One Winter Street -5th Floor Boston, Massachusetts 02108 ATTN: Frederick Civian, Stormwater Coordinator c. Late notification: A small MS4 is not prohibited from submitting a NOI after the dates provided in part 1.7.2.d. However, if a late NOI is submitted, authorization is only for discharges that occur after permit authorization is granted. EPA and MassDEP reserve the right to take enforcement actions for any unpermitted discharges. All NOIs submitted after December 21, 2020 must be submitted electronically. 1.7.4. Public Notice of NOI and Effective Date of Coverage a. EPA will provide a public notice and opportunity for comment on the contents of the submitted NOIs. The public comment period will be a minimum of 30 calendar days. b. Based on a review of a small MS4's NOI or other information, EPA may grant authorization, extend the public comment period, or deny authorization under this permit and require submission of an application for an individual or alternative NPDES permit. (See part 1.8) A small MS4 will be authorized to discharge under the terms and conditions of this permit upon receipt of notice of authorization from EPA. c. Permittees whose authorization to discharge under the MS4-2003 permit, which expired on May 1, 2008, has been administratively continued in accordance with the Administrative Procedure Act 5 U.S.C. § 558(c) and 40 CFR § 122.6, who wish to obtain coverage under this permit, must submit a new NOI requesting permit coverage in accordance with the requirements of part 1.7 of this permit to EPA within 90 days after the effective date of this permit. Permittees whose authorization to discharge under the expired MS4-2003 permit was administratively continued, who fail to submit a timely, complete and accurate NOI or an application for an individual NPDES permit within 90 days after the effective date of this permit will be considered to be discharging without a permit (see 40 CFR § 122.28(b)(3)(iii)). 1.8. Individual Permits and Alternative General Permits a. EPA may require a small MS4 to apply for and obtain authorization under either an individual NPDES permit or an alternative NPDES general permit. Any interested person may petition EPA in accordance with the provisions of 40 CFR § 122.26(f) to require a small MS4 to apply for and/or obtain authorization under either an individual NPDES permit or an alternative NPDES general permit. If EPA requires a small MS4 to apply for an individual or alternative NPDES permit, EPA will notify the small MS4 in writing that a permit application is required. This notification will include a brief statement of the reasons for this decision and will provide application information and an application deadline. If a small MS4 is authorized under the MS4-2003 permit or this permit and fails to submit an individual NPDES or an alternative general permit NPDES permit application as required by EPA, then the authorization under the MS4-2003 permit or this permit to the small MS4 is automatically terminated at the end of the date specified by EPA as the deadline MA MS4 General Permit for application submittal. EPA reserves the right to take enforcement action for any unpermitted discharge. b. A small MS4 may request to be excluded from this general permit by applying for an individual permit or authorization under an alternative general permit. In such a case, a small MS4 shall submit an individual permit application in accordance with the requirements of 40 CFR § 122.33(b) (2) (i) or § 122.33(b) (2) (ii), with reasons supporting the request, to EPA at the address listed in part 1.7.3 of this permit. The request may be granted by issuance of an individual permit or authorization under an alternative general permit if EPA determines that the reasons stated by the small MS4 are adequate to support the request. (See 40 CFR § 122.28(b) (3)). c. When an individual NPDES permit is issued, or a small MS4 is authorized to discharge under an alternative NPDES general permit, authorization under this permit automatically terminates on the effective date of the individual permit or the date of authorization of coverage under the alternative general permit. 1.9. Special Eligibility Determinations 1.9.1. Documentation Regarding Endangered Species The small MS4 shall certify eligibility regarding endangered species in the NOI required by part 1.7.2. The Stormwater Management Program (SWMP) shall include documentation supporting the permittee's eligibility determination with regard to federal Endangered and Threatened Species and Critical Habitat Protection, including: Results of the Appendix C U.S. Fish and Wildlife Service endangered species screening determination; and If applicable, a description of the measures the small MS4 shall implement to protect federally listed endangered or threatened species, or critical habitat, including any conditions imposed by the U.S. Fish and Wildlife Service. If a permittee fails to document and implement such measures, the permittee's discharges are ineligible for coverage under this permit. 1.9.2. Documentation Regarding Historic Properties The small MS4 shall certify eligibility regarding historic properties on the NOI required by part 1.7.2. The SWMP shall include documentation supporting the small MS4's eligibility determination with regard to Historic Properties Preservation, including: • Information on whether the permittee's stormwater discharges, allowable non- stormwater discharges, or stormwater discharge -related activities would have an effect on a property that is listed or eligible for listing on the National Register of Historic Properties (NRHP); • Where such effects may occur, any documents received by the permittee or any written agreements the permittee has made with the State Historic Preservation Officer (SHPO), Tribal Historic Preservation Officer (THPO), or other Tribal representative to mitigate those effects; • Results of the Appendix D historic property screening investigations; and • If applicable, a description of the measures the permittee shall implement to avoid or minimize adverse impacts on places listed, or eligible for listing, on the NRHP, including any conditions imposed by the SHPO or THPO. If the permittee fails to MA MS4 General Permit document and implement such measures, those discharges are ineligible for coverage under this permit. 1.10. Stormwater Management Program (SWMP) a. The permittee shall develop and implement a written (hardcopy or electronic) SWMP. The SWMP shall be signed in accordance with Appendix B, Subsection 11, including the date of signature. A signature and date is required for initial program preparation and for any significant revision to the program, which shall be in writing. The written SWMP shall be completed within one (1) year of the effective date of the permit. The SWMP is the document used by the permittee to describe and detail the activities and measures that will be implemented to meet the terms and conditions of the permit. The SWMP shall accurately describe the permittees plans and activities. The document should be updated and/or modified during the permit term as the permittee's activities are modified, changed or updated to meet permit conditions during the permit term. b. Permittees authorized by the MS4-2003 permit shall modify or update their existing Best Management Practices (BMPs) and measurable goals to meet the terms and conditions of part 2.3 of this permit within one (1) year of the effective date of the permit. These modifications and updates shall be reflected in the written (hardcopy or electronic) SWMP. Permittees authorized by the MS4-2003 permit shall continue to implement their existing SWMP until the program has been updated. 1.10.1. Stormwater Management Program Availability a. The permittee shall retain a copy of the current SWMP required by this permit at the office or facility of the person listed as the program contact on the submitted Notice of Intent (NOI). The SWMP shall be immediately available to representatives from EPA, MassDEP, U.S. Fish and Wildlife Service (USFWS) and the National Marine Fisheries Service (NMFS) at the time of an onsite inspection or upon request. b. The permittee shall make the SWMP available to the public during normal business hours. The permittee shall also post the SWMP online' if the permittee has a website on which to post the SWMP. 1.10.2. Contents and Timelines of the Stormwater Management Program for 2003 permittees The following information must be included in the SWMP within one (1) year of the permit effective date and updated annually thereafter, as necessary: Identification of names and titles of people responsible for program implementation. If a position is currently unfilled, list the title of the position and modify the SWMP with the name once the position is filled; Documentation of compliance with part 1.9.1; Documentation of compliance with part 1.9.2; ' Should a permittee not wish to post mapping information included in the SWMP (see part 1.10.2) on their website for public safety reasons, they must state the reason either with or within the online SWMP and provide how the MS4 mapping information can be obtained. The permittee must retain the entire SWMP, including all completed mapping, at a location where it can be made available to the public during normal business hours. 10 MA MS4 General Permit • Documentation of authorization of all new or increased discharges granted by MassDEP in compliance with part 2.1.2; • Listing of all discharges identified pursuant to part 2.1.1 and description of response; • Description of practices to achieve compliance with part 2.3 (MEP requirements) identified in the permittee's NOI and any updates to those BMPs within the first year; For each permit condition in part 2.3 identify: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal shall have a measure of assessment associated with it; • Sanitary Sewer Overflow (SSO) inventory including all of the information required in part 2.3.4.4.b; • Written IDDE Program pursuant to part 2.3.4.6; • Written procedures for site inspections and enforcement of sediment and erosion control procedures in accordance with part 2.3.5; • Description of measures to avoid or minimize impacts to surface public drinking water supply sources. The permittee is also encouraged to include provisions to notify public water supplies in the event of an emergency. Massachusetts Department of Environmental Protection, Bureau of Resource Protection, Drinking Water Program, One Winter Street, Boston, MA 02108 — phone 617.292.5770. • Description of activities to achieve compliance with part 3.0; • Annual program evaluation (part 4.1). Update annually and maintain copies. The following information must be included in the SWMP within two (2) years of the permit effective date and updated annually thereafter, as necessary: • Listing of all receiving waterbody segments, their classification under the applicable state water quality standards, any impairment(s) and associated pollutant(s) of concern, applicable TMDLs and WLAs, and number of outfalls from the MS4 that discharge to each waterbody. In addition to the receiving water, the permittee shall document in the SWMP all surface public drinking water sources that may be impacted by MS4 discharges; • Listing of all interconnected MS4s and other separate storm sewer systems receiving a discharge from the permitted MS4, the receiving waterbody segment(s) ultimately receiving the discharge, their classification under the applicable state water quality standards, any impairment(s) and associated pollutant(s) of concern, applicable TMDLs and WLAs, and the number of interconnections; • Written procedures to require submission of as -built drawings and ensure long term operation and maintenance in accordance with part 2.3.6.a.iii; • The map of the separate storm sewer system required by part 2.3.4.5. The following information must be included in the SWMP within four (4) years of the permit effective date and updated annually thereafter, as necessary: • Report(s) assessing current street design and parking lot guidelines and other local requirements within the municipality that affect the creation of impervious cover. The following information must be included in the SWMP concurrent with the applicable 11 MA MS4 General Permit deadlines in Appendix F and H and updated annually thereafter, as necessary: Description of practices to achieve compliance with part 2.2.1 (TMDL requirements) including: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal must have an associated measure of assessment. Description of practices to achieve compliance with part 2.2.2 (discharges to certain water quality limited waters subject to additional requirements) including: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal must have an associated measure of assessment; Description of any other practices to achieve compliance with part 2.1 (water quality based requirements) 1.10.3. Contents and Timelines of the Stormwater Management Program for New Permittees a. Permittees seeking authorization for the first time shall meet all deadlines contained in this permit except the following: • Timelines for public education requirements in part 2.3.2.c shall be extended by one (1) year and need to include one (1) message to each audience over the permit term; • The ordinances, by-laws, or other regulatory mechanisms required by parts 2.3.4, 2.3.5 and 2.3.6 shall be completed as soon as possible, but no later than three (3) years from the permit effective date; and • All other deadlines in part 2.3.4 shall be extended by three (3) years. • All other deadlines in part 2.3.5, 2.3.6 and 2.3.7 shall be extended by two (2) years. • All deadlines for discharges to water quality limited waters without a TMDL under part 2.2.2 shall be extended by two (2) years. b. Contents of the Stormwater Management Program for New Permittees The following information must be included in the SWMP within one (1) year of the permit effective date and updated annually thereafter, as necessary: • Identification of names and titles of people responsible for program implementation. If a position is currently unfilled, list the title of the position and modify the SWMP with the name once the position is filled; • Documentation of compliance with part 1.9.1; • Documentation of compliance with part 1.9.2; • Documentation of authorization of all new or increased discharges granted by MassDEP in compliance with part 2.1.2; • Listing of all discharges identified pursuant to part 2.1.1 and description of response; • Description of practices to achieve compliance with part 2.3 (MEP requirements) identified in the permittee's NOI and any updates to those BMPs within the first year; 12 MA MS4 General Permit For each permit condition in part 2.3 identify: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal shall have a measure of assessment associated with it; Description of measures to avoid or minimize impacts to surface public drinking water supply sources. The permittee is also encouraged to include provisions to notify public water supplies in the event of an emergency. Massachusetts Department of Environmental Protection, Bureau of Resource Protection, Drinking Water Program, One Winter Street, Boston, MA 02108 — phone 617.292.5770. Description of activities to achieve compliance with part 3.0; Annual program evaluation (part 4.1). Update annually and maintain copies. The following information must be included in the SWMP within three (3) years of the permit effective date and updated annually thereafter, as necessary: • Written procedures for site inspections and enforcement of sediment and erosion control procedures in accordance with part 2.3.5; The following information must be included in the SWMP within four (4) years of the permit effective date and updated annually thereafter, as necessary: • Outfall and interconnection inventory; • Sanitary Sewer Overflow (SSO) inventory including all of the information required in part 2.3.4.4.b; • Written IDDE Program pursuant to part 2.3.4.6. • Written operation and maintenance procedures for municipal activities in part 2.3.7.a.ii; • Written program detailing the activities and procedures the permittee will implement so that the MS4 infrastructure is maintained in a timely manner to reduce the discharge of pollutants from the MS4 in accordance with part 2.3.7.a.iii.1; • Written procedures to require submission of as -built drawings and ensure long term operation and maintenance in accordance with part 2.3.6.a.iii; The following information must be included in the SWMP within five (5) years of the permit effective date and updated annually thereafter, as necessary: Phase 1 of the map of the separate storm sewer system required by part 2.3.4.5; Listing of all receiving waterbody segments, their classification under the applicable state water quality standards, any impairment(s) and associated pollutant(s) of concern, applicable TMDLs and WLAs, and number of outfalls from the MS4 that discharge to each waterbody. In addition to the receiving water, the permittee shall document in the SWMP all surface public drinking water sources that may be impacted by MS4 discharges; Listing of all interconnected MS4s and other separate storm sewer systems receiving a discharge from the permitted MS4, the receiving waterbody segment(s) ultimately receiving the discharge, their classification under the applicable state water quality standards, any impairment(s) and associated pollutant(s) of concern, applicable TMDLs and WLAs, and the number of interconnections; 13 MA MS4 General Permit The following information must be included in the SWMP within six (6) years of the permit effective date and updated annually thereafter, as necessary: • Report(s) assessing current street design and parking lot guidelines and other local requirements within the municipality that affect the creation of impervious cover. The following information must be included in the SWMP concurrent with the applicable deadlines in Appendix F and H (extended by two (2) years) and updated annually thereafter, as necessary: Description of practices to achieve compliance with part 2.2.1 (discharges subject to requirements related to approved TMDLs)including: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal must have an associated measure of assessment. Description of practices to achieve compliance with part 2.2.2 (discharges to certain water quality limited waters subject to additional requirements) including: - The person(s) or department responsible for the measure; - The BMPs for the control measure or permit requirement; - The measurable goal(s) for each BMP. Each measurable goal shall include milestones and timeframes for its implementation and have a quantity or quality associated with its endpoint. Each goal must have an associated measure of assessment; Description of any other practices to achieve compliance with part 2.1 (water quality based requirements). 2.0. Non -Numeric Effluent Limitations The permittee shall develop, implement, and enforce a program to reduce the discharge of pollutants from the MS4 to the maximum extent practicable; to protect water quality and to satisfy the appropriate water quality requirements of the Clean Water Act and the Massachusetts Water Quality Standards. 2.1. Water Quality Based Effluent Limitations Pursuant to Clean Water Act 402(p)(3)(B)(iii), this permit includes provisions to ensure that discharges from the permittee's small MS4 do not cause or contribute to an exceedance of water quality standards, in addition to requirements to reduce the discharge of pollutants to the maximum extent practicable. The requirements found in this part and part 2.2 constitute appropriate water quality based effluent limits of this permit. Requirements to reduce the discharge of pollutants to the maximum extent practicable are set forth in part 2.3. 2.1.1. Requirement to Meet Water Quality Standards a. The permittee shall reduce the discharge of pollutants such that the discharges from the MS4 do not cause or contribute to an exceedance of water quality standards. 14 MA MS4 General Permit b. If there is a discharge from the MS4 to a waterbody (or its tributaries in some cases) that is subject to an approved TMDL identified in part 2.2.1, the permittee is subject to the requirements of part 2.2.1 and Appendix F of this permit and the permittee shall comply with all applicable schedules and requirements in Appendix F. A permittee's compliance with all applicable requirements and BMP implementation schedules in Appendix F applicable to it will constitute compliance with part 2.1. La. of the Permit. If there is a discharge from the MS4 to a waterbody (or its tributaries in some cases) that is water quality limited (see definition in Appendix A) due to nutrients (Total Nitrogen or Total Phosphorus), metals (Cadmium, Copper, Iron, Lead or Zinc), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enterococcus or Fecal Coliform), chloride (Chloride) or oil and grease (Petroleum Hydrocarbons or Oil and Grease) and is not subject to an approved TMDL, or the MS4 is located within a municipality listed in part 2.2.2.a.-b., the permittee is subject to the requirements of part 2.2.2 and Appendix H of this permit and the permittee shall comply with all applicable schedules and requirements in Appendix H. A permittee's compliance with all applicable requirements and BMP implementation schedules in Appendix H applicable to it will constitute compliance with part 2.1. La. of the Permit. d. Except where a pollutant of concern in a discharge is subject to the requirements of part 2.2.1 and/or part 2.2.2 of this permit or is the result of an illicit discharge and subject to part 2.3.4 of this Permit, if a pollutant in a discharge from the MS4 is causing or contributing to a violation of applicable water quality criteria for the receiving water, the permittee shall, as expeditiously as possible, but no later than 60 days of becoming aware of the situation, reduce or eliminate the pollutant in its discharge such that the discharge meets applicable water quality criteria. 2.1.2. Increased Discharges a. Any increased discharge, including increased pollutant loading(s) through the MS4 to waters of the United States is subject to Massachusetts antidegradation regulations at 314 CMR 4.04. The permittee shall comply with the provisions of 314 CMR 4.04 including information submittal requirements and obtaining authorization for increased discharges where appropriate'. Any authorization of an increased discharge by MassDEP shall be incorporated into the permittee's SWMP. If an applicable MassDEP approval specifies additional conditions or requirements, then those requirements are incorporated into this permit by reference. The permittee must comply with all such requirements. b. There shall be no increased discharges, including increased pollutant loading(s) from the MS4 to impaired waters listed in categories 5 or 4b on the most recent Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b) unless the permittee demonstrates that there is no net increase in loading from the MS4 to the impaired water of the pollutant(s) for which the waterbody is impaired. The permittee may demonstrate compliance with this provision by either: i. Documenting that the pollutant(s) for which the waterbody is impaired is not present in the MS4's discharge and retaining documentation of this finding with the SWMP; or 2 Applicable water quality criteria are part of the state standards that have been federally approved as of the effective date of this permit and are compiled by EPA at http://www.epa.gov/waterscience/standards/wgslibrar ' Contact MassDEP for guidance on compliance with 314 CMR 4.04 15 MA MS4 General Permit ii. Documenting that the total load of the pollutant(s) of concern from the MS4 to any impaired portion of the receiving water will not increase as a result of the activity and retaining documentation of this finding in the SWMP. Unless otherwise determined by the Permittee, USEPA or by MassDEP that additional demonstration is necessary, compliance with the requirements of part 2.2.2 and part 2.3.6 of this Permit, including all reporting and documentation requirements, shall be considered as demonstrating no net increase as required by this part. c. The requirements of this part are independent of permit conditions requiring reduction in discharges of pollutants as set forth in parts 2.1.1 and 2.2 (water quality based requirements) and 2.3 (requirements to reduce discharge of pollutants to the maximum extent practicable). Permittees remain subject to requirements to reduce the discharge of pollutants from the MS4 as set forth in those parts. 2.2. Discharges to Certain Impaired Waters The permittee shall identify in the SWMP and Annual Reports all MS4 discharges, including both outfalls and interconnections to other MS4s or other separate storm sewer systems, that: • Are subject to Total Maximum Daily Load (TMDL) related requirements as identified in part 2.2.1. • Are subject to additional requirements to protect water quality as identified in part 2.2.2. The discharge location from an interconnection shall be determined based on the receiving water of the outfall from the interconnected system. 2.2.1. Discharges Subject to Requirements Related to an Approved TMDL a. "Approved TMDLs" are those that have been approved by EPA as of the date of issuance of this permit. b. The MS4s specified below discharge to waters within Massachusetts that are subject to TMDLs, or in some cases, to tributaries of such waters, and shall comply with the requirements of Appendix F, part A. Appendix F identifies, by section, the provisions the permittee shall implement to be consistent with the terms of the approved TMDL. Alternatively, EPA may notify the permittee that an individual permit application is necessary in accordance with part 1.8.a. i. The following is a list of municipalities in the Charles River Watershed: 1. Arlington Mendon Ashland Milford Bellingham Millis Belmont Natick Brookline Needham Cambridge Newton Dedham Norfolk LG! MA MS4 General Permit Dover Sherbom Foxborou h Walpole Franklin Waltham Holliston Watertown Hopedale Wayland Hopkinton Wellesley Lexington Weston Lincoln Westwood Medfield Wrentham Medway Permittees that operate regulated MS4s located in municipalities listed above that discharge to the Charles River or its Tributaries shall meet the requirements of Appendix F, part A.I with respect to the reduction of phosphorus discharges from their MS4. ii. The following is a list of municipalities that contain a lake or pond subject to an approved lake or pond phosphorus TMDL in the Northern Blackstone Basin, Chicopee Basin, Connecticut Basin, French Basin, Millers Basin or in the watershed of Bare Hill Pond, Flint Pond, Indian Lake, Lake Boon, Lake Quinsigamond, Leesville Pond, Salisbury Pond, Quaboag Pond or Quacumquasit Pond. 1. Auburn Millbury Charlton Oxford Dudley Shrewsbury Gardner Spencer Grafton Springfield Granby Stow Hadley Templeton Harvard Westminster Hudson Winchendon Leicester Wilbraham Ludlow Permittees that operate regulated MS4s in the above municipalities that discharge to waterbodies listed on Table F-6 in Appendix F or their tributaries, and any other MS4 that discharges to waterbodies listed on Table F-6 in Appendix F or their tributaries, shall meet the requirements of Appendix F, part A.II with respect to reduction of phosphorus discharges from their MS4. 17 MA MS4 General Permit iii. The following is a list of municipalities that contain waters subject to an approved TMDL for bacteria or pathogens. Abington Marshfield Acushnet Mashpee Andover Matta oisett Avon Medfield Barnstable Medway Bedford Melrose Bellingham Mendon Belmont Milford Berkley Millis Beverly Milton Billerica Nahant Bourne Natick Brewster Needham Bridgewater New Bedford Brockton Newton Brookline Norfolk Burlington North Andover Cambridge Norton Canton Norwell Chatham Norwood Cohasset Orleans Concord Peabody Danvers Pembroke Dartmouth Plymouth Dedham Raynham Dennis Rehoboth Dighton Revere Dover Rockland Duxbury Rockport East Bridgewater Salem Eastham Sandwich Essex Saugus Everett Scituate Fairhaven Seekonk Fall River Sharon Falmouth Sherborn Foxborough Somerset Franklin Stoughton 1E:3 MA MS4 General Permit Freetown Swampscott Gloucester Swansea Hanover Taunton Hanson Tewksbury Harwich Wakefield Holliston Walpole Hopedale Waltham Hopkinton Wareham Ipswich Watertown Kingston Wellesley Lawrence Wellfleet Lexington West Bridgewater Lincoln Weston Lynn Westport Lynnfield Westwood Malden Whitman Manchester Wilmington Mansfield Winthrop Marblehead Yarmouth Marion The operators of MS4s located in municipalities listed above that discharge to a waterbody segment listed on Table F-8 in Appendix F and any other MS4 that discharges directly to a waterbody segment listed on Table F-8 in Appendix F shall meet the requirements of Appendix F, part A.III with respect to reduction of bacteria/pathogens discharges from their MS4. iv. The following is a list of municipalities located on Cape Cod that contain waters subject to an approved TMDL for nitrogen (Total Nitrogen). 1. Bourne Barnstable Chatham Falmouth Harwich Mashpee Orleans Yarmouth Permittees that operate regulated MS4s located in the municipalities above that discharge to waterbodies found on Table F-9 in Appendix F or their tributaries and any other MS4 that discharges to waterbodies found on Table F-9 in Appendix F or their IM MA MS4 General Permit tributaries shall meet the requirements of Appendix F, part A.IV with respect to reduction of nitrogen discharges from their MS4. v. The following is a list of municipalities located in the Assabet River Watershed: 1. Acton Hudson Berlin Littleton Bolton Marlborough Boxborough Maynard Boylston Northborough Ca rlisle Shrewsbury Clinton Stow Concord Westborough Grafton Westford Harvard Permittees that operate regulated MS4s located in the municipalities above that discharge to the Assabet River or its tributaries shall meet the requirements of Appendix F part A.V with respect to reduction of phosphorus discharges from their MS4. c. The MS4s specified below discharge to waters, or tributaries of waters, that have been identified in an adjacent state's approved TMDL as being impaired due, in part, to MS4 stormwater discharges in Massachusetts, and shall comply with the requirements of Appendix F, part B. Appendix F identifies, by section, the provisions the permittee shall implement to be consistent with the reasonable assumptions related to Massachusetts MS4 discharges. Alternatively, EPA may notify the permittee that an individual permit application is necessary in accordance with part 1.8.a. i. The following is a list of municipalities in Massachusetts located in the watershed of Long Island Sound, which has an approved TMDL for nitrogen (Total Nitrogen). 1. Adams North Adams Agawam Northampton Amherst Oxford Ashburnham Palmer Ashby Paxton Auburn Pelham Belchertown Pittsfield Charlton Richmond Cheshire Russell Chicopee Rutland Dalton South Hadley Douglas Southampton K1 MA MS4 General Permit Dudley Southbridge East Longmeadow Southwick Easthampton Spencer Gardner Springfield Granby Sturbridge Hadley Sutton Hampden Templeton Hatfield Ware Hinsdale Webster Holyoke West Springfield Lanesborough Westfield Leicester Westhampton Lenox Westminster Longmeadow Wilbraham Ludlow Williamsburg Millbury Winchendon Monson Permittees that operate regulated MS4s located in the municipalities above that discharge to a water within the Connecticut River Watershed, the Housatonic River Watershed, or the Thames River Watershed shall meet the requirements of Appendix F part B. I with respect to nitrogen discharges from their MS4. ii. The following is a list of municipalities in Massachusetts identified in a TMDL as containing MS4s contributing phosphorus to waterbody segments that have out of state approved TMDLs for phosphorus: 1. Attleboro North Attleborou h Plainville Rehoboth Seekonk Swansea Permittees that operate regulated MS4s located in the municipalities above that discharge to a waterbody found on Table F-12 in Appendix F or its tributaries shall meet the requirements of Appendix F part B. II with respect to phosphorus discharges from their MS4. iii. The following is a list of municipalities in Massachusetts identified in a TMDL as containing MS4s contributing bacteria/pathogens to waterbody segments that have out of state approved TMDLs for bacteria/pathogens: 1. Attleboro 21 MA MS4 General Permit North Attleborou h Plainville Rehoboth Seekonk Permittees that operate regulated MS4s located in the municipalities above that discharge to a waterbody found on Table F-13 in Appendix F or its tributaries shall meet the requirements of Appendix F part B. III with respect to bacteria/pathogens discharges from their MS4. iv. The following is a list of municipalities in Massachusetts identified in a TMDL as containing MS4s contributing metals (cadmium, lead, aluminum iron) to waterbody segments that have out of state approved TMDLs for metals (cadmium, lead, aluminum, iron): 1. Attleboro North Attleborou h Plainville Seekonk Permittees that operate regulated MS4s located in the municipalities above that discharge to a waterbody found on Table F-14 in Appendix F or its tributaries shall meet the requirements of Appendix F part B. IV with respect to metals discharges from their MS4. 2.2.2. Discharges to Certain Water Quality Limited Waters Subject to Additional Requirements For purposes of this permit, a `water quality limited water body' is any water body that does not meet applicable water quality standards, including but not limited to waters listed in categories 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b). If there is a discharge from the MS4 to a water quality limited waterbody where pollutants typically found in stormwater (specifically nutrients (Total Nitrogen or Total Phosphorus), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enteroccus or Fecal Coliform), chloride (Chloride), metals (Cadmium, Copper, Iron, Lead or Zinc) and oil and grease (Petroleum Hydrocarbons or Oil and Grease)) are the cause of the impairment and there is not an approved TMDL, or the MS4 is located in a town listed in part 2.2.2.a.-b, the permittee shall comply with the provisions in Appendix H applicable to it. In the absence of a defined pollutant reduction target and where no approved TMDL has been established, this permit part and Appendix H define an iterative approach addressing pollutant reductions to waterbodies where the permittee's discharge is causing or contributing to an excursion above water quality standards due to nutrients (Total Nitrogen Total Phosphorus), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enteroccus or Fecal Coliform), chloride (Chloride), metals (Cadmium, Copper, Iron, Lead or Zinc) or oil and grease (Petroleum Hydrocarbons or Oil and Grease). WJ MA MS4 General Permit a. Discharges to water quality limited waterbodies where nitrogen (Total Nitrogen) is the cause of the impairment, or their tributaries i. The requirements of this part are applicable to: 1. Permittees (including traditional and non-traditional MS4s) that own or operate an MS4 in the following municipalities. Discharges from MS4s within these municipalities are to waterbodies that are impaired due to nitrogen (Total Nitrogen), or their tributaries. Abington Matta oisett Acushnet Middleborough Attleboro New Bedford Avon Norton Barnstable Peabody Berkley Pembroke Bourne Plainville Bridgewater Plymouth Brockton Plympton Carver Raynham Dartmouth Rehoboth Dighton Rochester East Bridgewater Salem Easton Seekonk Fairhaven Sharon Fall River Somerset Foxborough Stoughton Freetown Swansea Halifax Taunton Hanson Wakefield Holbrook Wareham Kingston West Bridgewater Lakeville Westport Lynnfield Whitman Mansfield Wrentham Marion Yarmouth 2. Any other permittee that, during the permit term, becomes aware that its discharge is to a waterbody that is water quality limited due to nitrogen (Total Nitrogen), or a tributary of such water. ii. Permittees subject to part 2.2.2.a.i above shall meet the requirements of Appendix H part I with respect to the control of nitrogen discharges from their MS4; 0*j MA MS4 General Permit iii. During development of their Notice of Intent, the permittee may determine that all discharges from the regulated area through their MS4 are outside of a watershed that contains a nitrogen (Total Nitrogen) impairment in a downstream segment. The permittee shall retain all documentation used in this determination as part of their NOI and are relieved from the requirements of part 2.2.2.a.i and Appendix H part I. b. Discharges to water quality limited waterbodies where phosphorus ("Total Phosphorus") is the cause of the impairment, or their tributaries i. The requirements of this part are applicable to: 1. Permittees (including traditional and non-traditional MS4s) that own or operate an MS4 in the following municipalities. Discharges from MS4s within these municipalities are to waterbodies that are impaired due to phosphorus (Total Phosphorus), or their tributaries. Abington Lynn Acushnet Lynnfield Andover Malden Arlington Mansfield Ashburnham Marlborough Ashland Mashpee Auburn Medfield Avon Medford Ayer Melrose Barnstable Mendon Bedford Methuen Belchertown Millbury Belmont Millville Billerica Milton Blackstone North Andover Bolton Northbridge Brewster Norton Bridgewater Norwood Brockton Oxford Burlington Peabody Cambridge Pembroke Canton Pepperell Carlisle Pittsfield Carver Quincy Chelmsford Randolph Chelsea Reading MA MS4 General Permit Clinton Revere Concord Rockland Dalton Salem Dedham Scituate Douglas Seekonk Dover Sharon Dracut Shirley Dunstable Shrewsbury East Bridgewater Somerville Eastham Southampton Easthampton Spencer Everett Springfield Falmouth Stoneham Fitchburg Stoughton Foxborough Sudbury Framingham Sutton Gloucester Taunton Grafton Tewksbury Granby Townsend Groton Tyngsborough Halifax Upton Hanover Uxbridge Hanson Wakefield Harvard Walpole Haverhill Wareham Hinsdale Watertown Hopkinton Wayland Hudson West Bridgewater Lancaster Westfield Lawrence Westminster Leicester Westwood Lenox Whitman Leominster Wilmington Lexington Winchendon Littleton Winchester Lowell Winthrop Lunenburg Woburn Lynn 25 MA MS4 General Permit 2. Any other permittee that, during the permit term, becomes aware that its discharge is to a waterbody that is water quality limited due to phosphorus ("Total Phosphorus"), or to a tributary of such water. ii. The permittees subject to part 2.2.2.b.i. above shall meet all requirements of Appendix H part II with respect to the control of phosphorus discharges from the MS4. iii. During development of their Notice of Intent, the permittee may determine that all discharges from the regulated area through their MS4 are outside of a watershed that contains a phosphorus ("Total Phosphorus") impairment in a downstream segment. The permittee shall retain all documentation used in this determination as part of their NOI and are relieved from the requirements of part 2.2.2.b.i and Appendix H part II. c. Discharges to water quality limited waterbodies where bacteria or pathogens is the cause of the impairment i. The requirements of this part are applicable to: 1. Any MS4 discharge identified by the permittee on their Notice of Intent as discharging directly to an impaired waterbody on the most recent EPA approved Massachusetts 303(d) list where bacteria or pathogens (E. Coli, Enteroccus or Fecal Coliform) is the cause of the impairment. 2. Any other MS4 that, during the permit term, becomes aware that its discharge is to a waterbody that is water quality limited due to bacteria or pathogens. ii. The permittees subject to part 2.2.2.c.i. shall meet all requirements of Appendix H part III with respect to reduction of bacteria or pathogens discharges from the MS4. d. Discharges to water quality limited waterbodies where chloride (Chloride) is the cause of the impairment i. The requirements of this part are applicable to: 1. Any MS4 discharge identified by the permittee on their Notice of Intent as discharging directly to an impaired waterbody on the most recent EPA approved Massachusetts 303(d) list where chloride (Chloride) is the cause of the impairment. 2. Any other MS4 that, during the permit term, becomes aware that its discharge is to a waterbody that is water quality limited due to chloride (Chloride). ii. The permittees subject to part 2.2.2.d.i. shall meet all requirements of Appendix H part IV with respect to reduction of chloride discharges from the MS4. e. Discharges to water quality limited waterbodies where oil and grease (Petroleum Hydrocarbons or Oil and Grease), solids (TSS or Turbidity) or metals (Cadmium, Copper, Iron, Lead or Zinc) is the cause of the impairment i. The requirements of this part are applicable to: 1. Any MS4 discharge identified by the permittee on their Notice of Intent as discharging directly to an impaired waterbody on the most recent EPA 01, MA MS4 General Permit approved Massachusetts 303(d) list where oil and grease, solids or metals (Oil and Grease, Petroleum Hydrocarbons TSS, Turbidity, Cadmium, Copper, Iron, Lead or Zinc) is the cause of the impairment. 2. Any other MS4 that, during the permit term, becomes aware that its discharge is to a waterbody that is water quality limited due to oil and grease (Petroleum Hydrocarbons or Oil and Grease), solids (TSS or Turbidity) or metals (Cadmium, Copper, Iron, Lead or Zinc). ii. The permittees subject to part 2.2.2.d.i. shall meet all requirements of Appendix H part V with respect to reduction of solids, oil and grease or metals discharges from the MS4. 2.3. Requirements to Reduce Pollutants to the Maximum Extent Practicable (MEP) The permittee shall reduce the discharge of pollutants from the MS4 to the maximum extent practicable (MEP) as detailed in parts 2.3.2 through 2.3.7. 2.3.1. Control Measures a. Permittees authorized under the MS4-2003 permit shall continue to implement their existing SWMPs while updating their SWMPs pursuant to this permit. This permit does not extend the compliance deadlines set forth in the MS4-2003 permit. b. Implementation of one or more of the minimum control measures described in parts 2.3.2- 2.3.7 or other permit requirements may be shared with another entity (including another interconnected MS4) or the other entity may fully implement the measure or requirement, if the following requirements are satisfied: • The other entity, in fact, implements the control measure. • The particular control measure or component thereof undertaken by the other entity is at least as stringent as the corresponding permit requirement. • The other entity agrees to implement the control measure on the permittee's behalf. The annual reports must specify that the permittee is relying on another entity to satisfy some of its permit obligations and specify what those obligations are. • If the permittee is relying on another governmental entity regulated under 40 CFR § 122 to satisfy all of its permit obligations, including the obligation to file annual reports, the permittee shall note that fact in its NOI, but is not required to file annual reports. • The permittee remains responsible for compliance with all permit obligations if the other entity fails to implement the control measures (or component thereof). The permittee may enter into a legally binding agreement with the other entity regarding the other entity's performance of control measures, but the permittee remains ultimately responsible for permit compliance. 2.3.2. Public Education and Outreach Objective: The permittee shall implement an education program that includes educational goals based on stormwater issues of significance within the MS4 area. The ultimate objective of a public education program is to increase knowledge and change behavior of the public so that pollutants in stormwater are reduced. WA MA MS4 General Permit a. The permittee shall continue to implement the public education program required by the MS4- 2003 permit by distributing educational material to the MS4 community. The educational program shall define educational goals, express specific messages, define the targeted audience for each message, and identify responsible parties for program implementation. If appropriate for the target audience, materials may be developed in a language other than English. At a minimum, the program shall provide information concerning the impact of stormwater discharges on water bodies within the community, especially those waters that are impaired or identified as priority waters. The program shall identify steps and/or activities that the public can take to reduce the pollutants in stormwater runoff and their impacts to the environment. b. The educational program shall include education and outreach efforts for the following four audiences: (1) residents, (2) businesses, institutions (churches, hospitals), and commercial facilities, (3) developers (construction), and (4) industrial facilities, unless one of these audiences is not present in the MS4 community. In such a situation, the MS4 must document in both the NOI and SWMP which audience is absent from the community and no educational messages are required to that audience. c. The permittee shall distribute a minimum of two (2) educational messages over the permit term to each audience identified in part 2.3.2.b. The distribution of materials to each audience shall be spaced at least a year apart. Educational messages may be printed materials such as brochures or newsletters; electronic materials such as websites; mass media such as newspaper articles or public service announcement (radio or cable); targeted workshops on stormwater management, or displays in a public area such as town/city hall. The permittee may use existing materials if they are appropriate for the message the permittee chooses to deliver or the permittee may develop its own educational materials. The permittee may partner with other MS4s, community groups or watershed associations to implement the education program to meet this permit requirement. Some EPA educational materials are available at: http://cfpub.epa.goy/npstbx/index.html. d. The permittee shall, at a minimum, consider the topics listed in part 2.3.2.d.i. — iv when developing the outreach/education program. The topics are not exclusive and the permittee shall focus on those topics most relevant to the community. Residential program: effects of outdoor activities such as lawn care (use of pesticides, herbicides, and fertilizers and information on Massachusetts Regulation 331 CMR 31 pertaining to proper use of phosphorus containing fertilizers on turf grasses) on water quality; benefits of appropriate on -site infiltration of stormwater; effects of automotive work and car washing on water quality; proper disposal of swimming pool water; proper management of pet waste; maintenance of septic systems. If the small MS4 area has areas serviced by septic systems, the permittee shall consider information pertaining to maintenance of septic systems as part of its education program. ii. Business/Commercial/Institution program: proper lawn maintenance (use of pesticides, herbicides and fertilizer, and information on Massachusetts Regulation 331 CMR 31 pertaining to proper use of phosphorus containing fertilizers on turf grasses); benefits of appropriate on -site infiltration of stormwater; building maintenance (use of detergents); use of salt or other de-icing and anti -icing materials (minimize their use); proper storage of salt or other de-icing/anti-icing materials (cover/prevent runoff to storm system and contamination to ground water); proper storage of materials (emphasize pollution prevention); proper management of waste materials and dumpsters (cover and pollution W MA MS4 General Permit prevention); proper management of parking lot surfaces (sweeping); proper car care activities (washing of vehicles and maintenance); and proper disposal of swimming pool water by entities such as motels, hotels, and health and country clubs (discharges must be dechlorinated and otherwise free from pollutants). iii. Developers and Construction: proper sediment and erosion control management practices; information about Low Impact Development (LID) principles and technologies; and information about EPA's construction general permit (CGP). This education can also be a part of the Construction Site Stormwater Runoff Control measure detailed in part 2.3.5. iv. Industrial program: equipment inspection and maintenance; proper storage of industrial materials (emphasize pollution prevention); proper management and disposal of wastes; proper management of dumpsters; minimization of use of salt or other de-icing/anti- icing materials; proper storage of salt or other de-icing/anti-icing materials (cover/prevent runoff to storm system and ground water contamination); benefits of appropriate on -site infiltration of stormwater runoff from areas with low exposure to industrial materials such as roofs or employee parking; proper maintenance of parking lot surfaces (sweeping); and requirements for coverage under EPA's Multi -Sector General Permit. e. The program shall show evidence of focused messages for specific audiences as well as evidence that progress toward the defined educational goals of the program has been achieved. The permittee shall identify methods that it will use to evaluate the effectiveness of the educational messages and the overall education program. Any methods used to evaluate the effectiveness of the program shall be tied to the defined goals of the program and the overall objective of changes in behavior and knowledge. f. The permittee shall modify any ineffective messages or distribution techniques for an audience prior to the next scheduled message delivery. g. The permittee shall document in each annual report the messages for each audience; the method of distribution; the measures/methods used to assess the effectiveness of the messages, and the method/measures used to assess the overall effectiveness of the education program. 2.3.3. Public Involvement and Participation Objective: The permittee shall provide opportunities to engage the public to participate in the review and implementation of the permittee's SWMP. a. All public involvement activities shall comply with state public notice requirements (MGL Chapter 30A, Sections 18 — 25 — effective 7/10/2010). The SWMP and all annual reports shall be available to the public. b. The permittee shall annually provide the public an opportunity to participate in the review and implementation of the SWMP. c. The permittee shall report on the activities undertaken to provide public participation opportunities including compliance with part 2.3.3.a. Public participation opportunities pursuant 29 MA MS4 General Permit to part 2.3.3.b may include, but are not limited to, websites; hotlines; clean-up teams; monitoring teams; or an advisory committee. 2.3.4. Illicit Discharge Detection and Elimination (IDDE) Program Objective: The permittee shall implement an IDDE program to systematically find and eliminate sources of non-stormwater discharges to its municipal separate storm sewer system and implement procedures to prevent such discharges. a. Legal Authority - The IDDE program shall include adequate legal authority to: prohibit illicit discharges; investigate suspected illicit discharges; eliminate illicit discharges, including discharges from properties not owned by or controlled by the MS4 that discharge into the MS4 system; and implement appropriate enforcement procedures and actions. Adequate legal authority consists of a currently effective ordinance, by-law, or other regulatory mechanism. For permittees authorized by the MS4-2003 permit, the ordinance, by-law, or other regulatory mechanism was a requirement of the MS4-2003 permit and was required to be effective by May 1, 2008. For new permittees the ordinance, by-law, or other regulatory mechanism shall be in place within 3 years of the permit effective date. b. During the development of the new components of the IDDE program required by this permit, permittees authorized by the MS4-2003 permit must continue to implement their existing IDDE program required by the MS4-2003 permit to detect and eliminate illicit discharges to their MS4. 2.3.4.1. Definitions and Prohibitions The permittee shall prohibit illicit discharges and sanitary sewer overflows (SSOs) to its MS4 and require removal of such discharges consistent with parts 2.3.4.2 and 2.3.4.4 of this permit. An SSO is a discharge of untreated sanitary wastewater from a municipal sanitary sewer. An illicit discharge is any discharge to a municipal separate storm sewer that is not composed entirely of stormwater, except discharges pursuant to a NPDES permit (other than the NPDES permit for discharges from the municipal separate storm sewer) and discharges resulting from fire fighting activities. 2.3.4.2. Elimination of Illicit Discharges a. Upon detection of an illicit discharge, the permittee shall locate, identify and eliminate the illicit discharge as expeditiously as possible. Upon identification of the illicit source the MS4 notify all responsible parties for any such discharge and require immediate cessation of improper disposal practices in accordance with its legal authorities. Where elimination of an illicit discharge within 60 days of its identification as an illicit discharge is not possible, the permittee shall establish an expeditious schedule for its elimination and report the dates of identification and schedules for removal in the permittee's annual reports. The permittee shall immediately commence actions necessary for elimination. The permittee shall diligently pursue elimination of all illicit discharges. In the interim, the permittee shall take all reasonable and prudent measures to minimize the discharge of pollutants to and from its MS4. b. The period between identification and elimination of an illicit discharge is not a grace period. Discharges from an MS4 that are mixed with an illicit discharge are not authorized by this Permit (part 1.3.a) and remain unlawful until eliminated. U MA MS4 General Permit 2.3.4.3. Non-Stormwater Discharges The permittee may presume that the sources of non-stormwater listed in part 1.4 of this permit need not be addressed. However, if the permittee identifies any of these sources as significant contributors of pollutants to the MS4, then the permittee shall implement measures to control these sources so they are no longer significant contributors of pollutants, and/or eliminate them entirely, consistent with part 2.3.4. 2.3.4.4. Sanitary Sewer Overflows a. Upon detection of an SSO the permittee shall eliminate it as expeditiously as possible and take interim mitigation measures to minimize the discharge of pollutants to and from its MS4 until elimination is completed. b. The permittee shall identify all known locations where SSOs have discharged to the MS4 within the previous five (5) years. This shall include SSOs resulting, during dry or wet weather, from inadequate conveyance capacities, or where interconnectivity of the storm and sanitary sewer infrastructure allows for communication of flow between the systems. Within one (1) year of the effective date of the permit, the permittee shall develop an inventory of all identified SSOs indicating the following information, if available: 1. Location (approximate street crossing/address and receiving water, if any); 2. A clear statement of whether the discharge entered a surface water directly or entered the MS4; 3. Date(s) and time(s) of each known SSO occurrence (i.e., beginning and end of any known discharge); 4. Estimated volume(s) of the occurrence; 5. Description of the occurrence indicating known or suspected cause(s); 6. Mitigation and corrective measures completed with dates implemented; and 7. Mitigation and corrective measures planned with implementation schedules. The permittee shall maintain the inventory as a part of the SWMP and update the inventory annually, all updates shall include the information in part 2.3.4.4.b.1-7. c. In accordance with Paragraph B.12 of Appendix B of this permit, upon becoming aware of an SSO to the MS4, the permittee shall provide oral notice to EPA within 24 hours. Additionally, the permittee shall provide written notice to EPA and MassDEP within five (5) days of becoming aware of the SSO occurrence and shall include the information in the updated inventory. The notice shall contain all of the information listed in part 2.3.4.4.b. Where common notification requirements for SSOs are included in multiple NPDES permits issued to a permittee, a single notification may be made to EPA as directed in the permittee's wastewater or CSO NPDES permit and constitutes compliance with this part. d. The permittee shall include and update the SSO inventory in its annual report, including the status of mitigation and corrective measures implemented by the permittee to address each SSO identified pursuant to this part. e. The period between detection and elimination of a discharge from the SSO to the MS4 is not a grace period. Discharges from an MS4 that are mixed with an SSO are not authorized by this Permit (part 1.3.a) and remain unlawful until eliminated. 31 MA MS4 General Permit 2.3.4.5. System mapping The permittee shall develop a revised and more detailed map than was required by the MS4-2003 permit. This revised map of the MS4 shall be completed in two phases as outlined below. The mapping shall include a depiction of the permittee's separate storm sewer system in the permit area. The mapping is intended to facilitate the identification of key infrastructure and factors influencing proper system operation, and the potential for illicit sanitary sewer discharges. a. Phase I: The system map shall be updated within two (2) years of the permit effective date to include the following information: • Outfalls and receiving waters (required by MS4-2003 permit) • Open channel conveyances (swales, ditches, etc.) • Interconnections with other MS4s and other storm sewer systems • Municipally -owned stormwater treatment structures (e.g., detention and retention basins, infiltration systems , bioretention areas, water quality swales, gross particle separators, oil/water separators, or other proprietary systems) • Waterbodies identified by name and indication of all use impairments as identified on the most recent EPA approved Massachusetts Integrated List of waters report pursuant to Clean Water Act section 303(d) and 305(b) • Initial catchment delineations. Any available system data and topographic information may be used to produce initial catchment delineations. For the purpose of this permit, a catchment is the area that drains to an individual outfall or interconnection. b. Phase II: The system map shall be updated annually as the following information becomes available during implementation of catchment investigation procedures in part 2.3.4.8. This information must be included in the map for all outfalls within ten (10) years of the permit effective date: • Outfall spatial location (latitude and longitude with a minimum accuracy of +/-30 feet) • Pipes • Manholes • Catch basins • Refined catchment delineations. Catchment delineations shall be updated to reflect information collected during catchment investigations • Municipal sanitary sewer system (if available) • Municipal combined sewer system (if applicable). c. Recommended elements to be included in the system map as information becomes available: • Storm sewer material, size (pipe diameter) and age • Sanitary sewer system material, size (pipe diameter) and age • Privately -owned stormwater treatment structures • Where a municipal sanitary sewer system exists, properties known or suspected to be served by a septic system, especially in high -density urban areas • Area where the permittee's MS4 has received or could receive flow from septic system discharges (e.g., areas with poor soils, or high ground water elevations unsuitable for conventional subsurface disposal systems) • Seasonal high water table elevations impacting sanitary alignments • Topography • Orthophotography Ky—i MA MS4 General Permit Alignments, dates and representation of work completed (with legend) of past illicit discharge investigations (e.g., flow isolation, dye testing, CCTV) Locations of suspected, confirmed and corrected illicit discharges (with dates and flow estimates). d. The mapping may be produced by hand or through computer -aided methods (e.g. GIS). The required scale and detail of the map shall be appropriate to facilitate a rapid understanding of the system by the permittee, EPA and the state. In addition, the mapping shall serve as a planning tool for the implementation and phasing of the IDDE program and demonstration of the extent of complete and planned investigations and corrections. The permittee shall update the mapping as necessary to reflect newly discovered information and required corrections or modifications. e. The permittee shall report on the progress towards the completion of the system map in each annual report. 2.3.4.6. Written Illicit Discharge Detection and Elimination Program The IDDE program shall be recorded in a written (hardcopy or electronic) document. The IDDE program shall include each of the elements described in parts 2.3.4.7 and part 2.3.4.8, unless the permittee provides a written explanation within the IDDE program as to why a particular element is not applicable to the permittee. Notwithstanding the permittee's explanation, EPA may at any time determine that a particular element is in fact applicable to the permittee and require the permittee to add it to the IDDE program. The written (hardcopy or electronic) IDDE program shall be completed within one (1) year of the effective date of the permit and updated in accordance with the milestones of this part. The permittee shall implement the IDDE program in accordance with the goals and milestones contained in this part. a. The written (hardcopy or electronic) IDDE program shall include a reference or citation of the authority the permittee will use to implement all aspects of the IDDE program. Statement of IDDE Program Responsibilities - The permittee shall establish a written (hardcopy or electronic) statement that clearly identifies responsibilities with regard to eliminating illicit discharges. The statement shall identify the lead municipal agency(ies) or department(s) responsible for implementing the IDDE Program as well as any other agencies or departments that may have responsibilities for aspects of the program (e.g., board of health responsibilities for overseeing septic system construction; sanitary sewer system staff, inspectional services for enforcing plumbing codes; town counsel responsibilities in enforcement actions, etc.). Where multiple departments and agencies have responsibilities with respect to the IDDE program specific areas of responsibility shall be defined and processes for coordination and data sharing shall be established and documented. C. Program Procedures — The permittee shall include in the written IDDE program all written procedures developed in accordance with the requirements and timelines in parts 2.3.4.7 and 2.3.4.8 below. At a minimum this shall include the written procedures for dry weather outfall screening and sampling and for catchment investigations. 2.3.4.7. Assessment and Priority Ranking of Outfalls/Interconnections The permittee shall assess and priority rank the outfalls in terms of their potential to have illicit discharges and SSOs and the related public health significance. This ranking will determine the priority order for Kit] MA MS4 General Permit screening of outfalls and interconnections pursuant to part 2.3.4.7.b, catchment investigations for evidence of illicit discharges and SSOs pursuant to part 2.3.4.8, and provides the basis for determining permit milestones of this part. a. Outfall/Interconnection Inventory and Initial Ranking_ An initial outfall and interconnection inventory and priority ranking to assess illicit discharge potential based on existing information shall be completed within one (1) year from the effective date of the permit; an updated inventory and ranking will be provided in each annual report thereafter. The inventory shall be updated annually to include data collected in connection with the dry weather screening and other relevant inspections conducted by the permittee. i. The outfall and interconnection inventory will identify each outfall and interconnection discharging from the MS4, record its location and condition, and provide a framework for tracking inspections, screenings and other activities under the permittee's IDDE program. An outfall means a point source as defined by 40 CFR § 122.2 as the point where the municipal separate storm sewer discharges to waters of the United States. An outfall does not include open conveyances connecting two municipal separate storm sewers or pipes, tunnels or other conveyances that connect segments of the same stream or other waters of the United States and that are used to convey waters of the United States. (40 CFR § 122.26(b)(9)). However, it is strongly recommended that a permittee inspect all accessible portions of the system as part of this process. Culverts longer than a simple road crossing shall be included in the inventory unless the permittee can confirm that they are free of any connections and simply convey waters of the United States. An interconnection means the point (excluding sheet flow over impervious surfaces) where the permittee's MS4 discharges to another MS4 or other storm sewer system, through which the discharge is conveyed to waters of the United States or to another storm sewer system and eventually to a water of the United States. ii. The permittee shall classify each of the permittee's outfalls and interconnections into one of the following categories: • Problem Outfalls: Outfalls/interconnections with known or suspected contributions of illicit discharges based on existing information shall be designated as Problem Outfalls. This shall include any outfalls/interconnections where previous screening indicates likely sewer input.' Problem Outfalls need not be screened pursuant to part 2.3.4.7.b. • High Priority Outfalls: Outfalls/interconnections that have not been classified as Problem Outfalls and that are: o discharging to an area of concern to public health due to proximity of public beaches, recreational areas, drinking water supplies or shellfish beds; o determined by the permittee as high priority based on the characteristics listed below or other available information; • Low Priority Outfalls: Outfalls/interconnections determined by the permittee as low priority based on the characteristics listed below or other available information. • Excluded outfalls: Outfalls/interconnections with no potential for illicit discharges may be 4 Likely sewer input indicators are any of the following: • Olfactory or visual evidence of sewage, • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and bacteria levels greater than the water quality criteria applicable to the receiving water, or • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and detectable levels of chlorine. Ki! MA MS4 General Permit excluded from the IDDE program. This category is limited to roadway drainage in undeveloped areas with no dwellings and no sanitary sewers; drainage for athletic fields, parks or undeveloped green space and associated parking without services; cross-country drainage alignments (that neither cross nor are in proximity to sanitary sewer alignments) through undeveloped land. iii. The permittee shall priority rank outfalls into the categories above (except for excluded outfalls), based on the following characteristics of the defined initial catchment area where information is available: • Past discharge complaints and reports. • Poor receiving water quality- the following guidelines are recommended to identify waters as having a high illicit discharge potential: exceeding water quality standards for bacteria; ammonia levels above 0.5 mg/l; surfactants levels greater than or equal to 0.25 mg/l. • Density of generating sites- Generating sites are those places, including institutional, municipal, commercial, or industrial sites, with a potential to generate pollutants that could contribute to illicit discharges. Examples of these sites include, but are not limited to, car dealers; car washes; gas stations; garden centers; and industrial manufacturing areas. • Age of development and infrastructure — Industrial areas greater than 40 years old and areas where the sanitary sewer system is more than 40 years old will probably have a high illicit discharge potential. Developments 20 years or younger will probably have a low illicit discharge potential. • Sewer conversion — contributing catchment areas that were once serviced by septic systems, but have been converted to sewer connections may have a high illicit discharge potential. • Historic combined sewer systems — contributing areas that were once serviced by a combined sewer system, but have been separated may have a high illicit discharge potential. • Surrounding density of aging septic systems — Septic systems thirty years or older in residential land use areas are prone to have failures and may have a high illicit discharge potential. • Culverted streams — any river or stream that is culverted for distances greater than a simple roadway crossing may have a high illicit discharge potential. • Water quality limited waterbodies that receive a discharge from the MS4 or waters with approved TMDLs applicable to the permittee, where illicit discharges have the potential to contain the pollutant identified as the cause of the water quality impairment. • The permittee may also consider additional relevant characteristics, including location -specific characteristics; if so, the permittee shall include the additional characteristics in its written (hardcopy or electronic) IDDE program. b. Dry Weather Outfall and Interconnection Screening and Sampling All outfalls/interconnections (excluding Problem and excluded Outfalls) shall be inspected for the presence of dry weather flow within three (3) years of the permit effective date. The permittee shall screen all High and Low Priority Outfalls in accordance with their initial ranking developed at part 2.3.4.7.a. i. Written procedure: The permittee shall develop an outfall and interconnection screening and sampling procedure to be included in the IDDE program within one (1) year of the permit effective date. This procedure shall include the following procedures for: sample collection, use of field kits, OR MA MS4 General Permit • storage and conveyance of samples (including relevant hold times), and • field data collection and storage. An example screening and sampling protocol (EPA New England Bacterial Source Tracking Protocol) can be found on EPA's website. ii. Weather conditions: Dry weather screening and sampling shall proceed only when no more than 0.1 inches of rainfall has occurred in the previous 24-hour period and no significant snow melt is occurring. iii. Screening requirements: For each outfall/interconnection: 1. The permittee shall record all of the following information and include it in the outfall/interconnection inventory and priority ranking: • unique identifier, • receiving water, • date of most recent inspection, • dimensions, • shape, • material (concrete, PVC), • spatial location (latitude and longitude with a minimum accuracy of +/-30 feet, • physical condition, • indicators of potential non-stormwater discharges (including presence or evidence of suspect flow and sensory observations such as odor, color, turbidity, floatables, or oil sheen). 2. If an outfalUinterconnection is inaccessible or submerged, the permittee shall proceed to the first accessible upstream manhole or structure for the observation and sampling and report the location with the screening results. 3. If no flow is observed, but evidence of illicit flow exists, the permittee shall revisit the outfall during dry weather within one week of the initial observation, if practicable, to perform a second dry weather screening and sample any observed flow (proceed as in iv. below). 4. Where dry weather flow is found at an outfalUinterconnection, at least one (1) sample shall be collected, and: a) Samples shall be analyzed at a minimum for: • ammonia, • chlorine, • conductivity, • salinity, • E. coli (freshwater receiving water) or enterococcus (saline or brackish receiving water), • surfactants (such as MBAS), • temperature, and Mi MA MS4 General Permit • pollutants of concern' b) All analyses with the exception of indicator bacteria and pollutants of concern can be performed with field test kits or field instrumentation and are not subject to 40 CFR part 136 requirements. Sampling for bacteria and pollutants of concern shall be conducted using the analytical methods found in 40 CFR § 136, or alternative methods approved by EPA in accordance with the procedures in 40 CFR § 136. Sampling for ammonia and surfactants must use sufficiently sensitive methods to detect those parameters at or below the threshold indicator concentrations of 0.5 mg/L for ammonia and 0.25 mg/L for surfactants. Sampling for residual chlorine must use a method with a detection limit of 0.02 mg/L or 20 ug/L. iv. The permittee may rely on screening conducted under the MS4-2003 permit, pursuant to an EPA enforcement action, or by the state or EPA to the extent that it meets the requirements of part 2.3.4.7.b.iii.4. All data shall be reported in each annual report. Permittees that have conducted substantially equivalent monitoring to that required by part 2.3.4.7.b as part of an EPA enforcement action can request an exemption from the requirements of part 2.3.4.7.b by submitting a written request to EPA and retaining exemption approval from EPA as part of the SWMP. Until the permittee receives formal written approval of the exemption from part 2.3.4.7.b from EPA the permittee remains subject to all requirements of part 2.3.4.7.b. V. The permittee shall submit all screening data used in compliance with this part in its Annual Report. c. Follow-up ranking of outfalls and interconnections: i. The permittee's outfall and interconnection ranking (2.3.4.7.a) shall be updated to reprioritize outfalls and interconnections based on information gathered during dry weather screening (part 2.3.4.7.b). ii. Outfalls/interconnections where relevant information was found indicating sewer input to the MS4 or sampling results indicating sewer input' shall be considered highly likely to contain illicit discharges from sanitary sources, and such outfalls/interconnections shall be ranked at the top of the High Priority Outfalls category for investigation. At this time, permittees may choose to rank other outfalls and interconnections based on any new information from the dry weather screening. iii. The ranking can be updated continuously as dry weather screening information becomes available, but shall be completed within three (3) years of the effective date of the permit. 2.3.4.8. Catchment Investigations The permittee shall develop a systematic procedure to investigate each catchment associated with an ' Where the discharge is directly into a water quality limited water or a water subject to an approved TMDL as indicated in Appendix F; the sample shall be analyzed for the pollutant(s) of concern identified as the cause of the impairment as specified in Appendix G 6 Likely sewer input indicators are any of the following: • Olfactory or visual evidence of sewage, • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and bacteria levels greater than the water quality criteria applicable to the receiving water, or • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and detectable levels of chlorine. 37 MA MS4 General Permit outfall or interconnection within their MS4 system. a. Timelines: • A written catchment investigation procedure shall be developed within 18 months of the permit effective date in accordance with the requirements of part 2.3.4.8.b below. • Investigations of catchments associated with Problem Outfalls shall begin no later than two (2) years from the permit effective date. • Investigations of catchments associated with High and Low Priority Outfalls shall follow the ranking of outfalls updated in part 2.3.4.7.c. • Investigations of catchments associated with Problem Outfalls shall be completed within seven (7) years of the permit effective date • Investigations of catchments where any information gathered on the outfall/interconnection identifies sewer input' shall be completed within seven (7) years of the permit effective date. • Investigations of catchments associated with all High- and Low -Priority Outfalls shall be completed within ten (10) years of the permit effective date. *For the purposes of these milestones, an individual catchment investigation will be considered complete if all relevant procedures in part 2.3.4.8.c. and 2.3.4.8.d. below have been completed. b. A written catchment investigation procedure shall be developed that: i. Identifies maps, historic plans and records, and other sources of data, including but not limited to plans related to the construction of the storm drain and of sanitary sewers, prior work performed on the storm drains or sanitary sewers, board of health or other municipal data on septic system failures or required upgrades, and complaint records related to SSOs, sanitary sewer surcharges, and septic system breakouts. These data sources will be used in identifying system vulnerability factors within each catchment. ii. Includes a manhole inspection methodology that shall describe a storm drain network investigation that involves systematically and progressively observing, sampling (as required below) and evaluating key junction manholes (see definition in Appendix A) in the MS4 to determine the approximate location of suspected illicit discharges or SSOs. The manhole inspection methodology may either start from the outfall and work up the system or start from the upper parts of the catchment and work down the system or be a combination of both practices. Either method must, at a minimum, include an investigation of each key junction manhole within the MS4, even where no evidence of an illicit discharge is observed at the outfall. The manhole inspection methodology must describe the method the permittee will use. The manhole inspection methodology shall include procedures for dry and wet weather investigations. iii. Establishes procedures to isolate and confirm sources of illicit discharges where manhole investigations or other physical evidence or screening has identified that MS4 alignments are influenced by illicit discharges or SSOs. These shall include isolation of the drainage area for implementation of more detailed investigations, inspection of additional manholes along the alignment to refine the location of potential contaminant sources, and methods such as sandbagging key junction manhole inlets, targeted internal plumbing inspections, dye testing, Likely sewer input indicators are any of the following: • Olfactory or visual evidence of sewage, • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and bacteria levels greater than the water quality criteria applicable to the receiving water, or • Ammonia > 0.5 mg/L, surfactants > 0.25 mg/L, and detectable levels of chlorine. 9N MA MS4 General Permit video inspections, or smoke testing to isolate and confirm the sources. c. Requirements for each catchment investigation associated with an outfall/interconnection: i. For each catchment being investigated, the permittee shall review relevant mapping and historic plans and records gathered in accordance with Part 2.3.4.8.b.i. This review shall be used to identify areas within the catchment with higher potential for illicit connections. The permittee shall identify and record the presence of any of the following specific System Vulnerability Factors (SVFs): • History of SSOs, including, but not limited to, those resulting from wet weather, high water table, or fat/oil/grease blockages; • Common or twin -invert manholes serving storm and sanitary sewer alignments; • Common trench construction serving both storm and sanitary sewer alignments; • Crossings of storm and sanitary sewer alignments where the sanitary system is shallower than the storm drain system; • Sanitary sewer alignments known or suspected to have been constructed with an underdrain system; • Inadequate sanitary sewer level of service (LOS) resulting in regular surcharging, customer back-ups, or frequent customer complaints; • Areas formerly served by combined sewer systems; • Sanitary sewer infrastructure defects such as leaking service laterals, cracked, broken, or offset sanitary infrastructure, directly piped connections between storm drain and sanitary sewer infrastructure, or other vulnerability factors identified through Inflow/Infiltration Analyses, Sanitary Sewer Evaluation Surveys, or other infrastructure investigations. EPA recommends the permittee include the following in their consideration of System Vulnerability Factors: • Sewer pump/lift stations, siphons, or known sanitary sewer restrictions where power/equipment failures or blockages could readily result in SSOs; • Any sanitary sewer and storm drain infrastructure greater than 40 years old; • Widespread code -required septic system upgrades required at property transfers (indicative of inadequate soils, water table separation, or other physical constraints of the area rather than poor owner maintenance); • History of multiple Board of Health actions addressing widespread septic system failures (indicative of inadequate soils, water table separation, or other physical constraints of the area rather than poor owner maintenance); The permittee shall document the presence or absence of System Vulnerability Factors for each catchment, retain this documentation as part of its IDDE program, and report this information in Annual Reports. Catchments with a minimum of one (1) System Vulnerability Factor are subject to wet weather sampling requirements of part 2.3.4.8.c.ii.2. ii. For each catchment, the permittee must inspect key junction manholes and gather catchment information on the locations of MS4 pipes, manholes, and the extent of the contributing catchment. For all catchments a) Infrastructure information shall be incorporated into the permittee's mapping required at part 2.3.4.5; the permittee will refine their catchment delineation based on the field investigation where appropriate. tit MA MS4 General Permit b) The SVF inventory for the catchment will be updated based on information obtained during the inspection, including common (twin invert) manholes, directly piped connections between storm drains and sanitary sewer infrastructure, common weir walls, sanitary sewer underdrain connections and other structural vulnerabilities where sanitary discharges could enter the storm drain system during wet weather. 1) Where a minimum of one (1) SVF is identified based on previous information or the investigation, a wet weather investigation must be conducted at the associated outfall (see below). c) During dry weather, key junction manholes' shall be opened and inspected systematically for visual and olfactory evidence of illicit connections (e.g., excrement, toilet paper, gray filamentous bacterial growth, or sanitary products present). 1) If flow is observed, the permittee shall sample the flow at a minimum for ammonia, chlorine and surfactants and can use field kits for these analyses. 2) Where sampling results or visual or olfactory evidence indicate potential illicit discharges or SSOs, the area draining to the junction manhole shall be flagged for further upstream investigation. d) Key junction and subsequent manhole investigations will proceed until the location of suspected illicit discharges or SSOs can be isolated to a pipe segment between two manholes. If no evidence of an illicit discharge is found, catchment investigations will be considered complete upon completion of key junction manhole sampling. 2. For all catchments with a minimum of one (1) SVF identified a) The permittee shall meet the requirements above for dry weather screening b) The permittee shall inspect and sample under wet weather conditions to the extent necessary to determine whether wet weather -induced high flows in sanitary sewers or high groundwater in areas served by septic systems result in discharges of sanitary flow to the MS4. 1) The permittee shall conduct at least one wet weather screening and sampling at the outfall that includes the same parameters required during dry weather screening, part 2.3.4.7.b.iii.4. 2) Wet weather sampling and screening shall proceed during or after a storm event of sufficient depth or intensity to produce a stormwater discharge. EPA strongly recommends sampling during the spring (March through June) when groundwater levels are relatively high. 3) The permit does not require a minimum rainfall event prior to wet weather screening. However, permittees may incorporate provisions that assist in targeting such discharges, including avoiding sampling during the initial period of discharge ("first flush") and/or identifying minimum storm event intensities likely to trigger sanitary sewer interconnections. c) This sampling can be done upon completion of any dry weather investigation but must be completed before the catchment investigation is marked as complete. iii. All data collected as part of the dry and wet weather catchment investigations shall be recorded and reported in each annual report. 'Where catchments do not contain junction manholes, the dry weather screening and sampling shall be considered as meeting the manhole inspection requirement. In these catchments, dry weather screenings that indicate potential presence of illicit discharges shall be further investigated pursuant to part 2.3.4.8.d. Investigations in these catchments may be considered complete where dry weather screening reveals no flow; no evidence of illicit discharges or SSOs is indicated through sampling results or visual or olfactory means; and no wet weather System Vulnerability Factors are identified. K MA MS4 General Permit d. Identification/Confirmation of illicit source Where the source of an illicit discharge has been approximated between two manholes in the permittee's MS4, the permittee shall isolate and identify/confirm the source of the illicit discharge using more detailed methods identified in their written procedure (2.3.4.8.b.iii). For outfalls that contained evidence of an illicit discharge, catchment investigations will be considered complete upon confirmation of all illicit sources. e. Illicit discharge removal When the specific source of an illicit discharge is identified, the permittee shall exercise its authority as necessary to require its removal pursuant to part 2.3.4.2 or 2.3.4.3. i. For each confirmed source the permittee shall include in the annual report the following information: • the location of the discharge and its source(s); • a description of the discharge; • the method of discovery; • date of discovery; • date of elimination, mitigation or enforcement action OR planned corrective measures and a schedule for completing the illicit discharge removal; and • estimate of the volume of flow removed. ii. Within one year of removal of all identified illicit discharges within a catchment area, confirmatory outfall or interconnection screening shall be conducted. The confirmatory screening shall be conducted in dry weather unless System Vulnerability Factors have been identified, in which case both dry weather and wet weather confirmatory screening shall be conducted. If confirmatory screening indicates evidence of additional illicit discharges, the catchment shall be scheduled for additional investigation. 2.3.4.9. Indicators of IDDE Program Progress The permittee shall define or describe indicators for tracking program success and evaluate and report on the overall effectiveness of the IDDE program in each annual report. At a minimum the permittee shall document in each annual report: • the number of SSOs and illicit discharges identified and removed, • the number and percent of total outfall catchments served by the MS4 evaluated using the catchment investigation procedure, • all dry weather and wet weather screening and sampling results and • the volume of sewage removed 2.3.4.10 Ongoing Screening Upon completion of all catchment investigations pursuant to part 2.3.4.8.c and illicit discharge removal and confirmation (if necessary) pursuant to paragraph 2.3.4.8.e, each outfall or interconnection shall be reprioritized for screening in accordance with part 2.3.4.7.a and scheduled for ongoing screening once every five years. Ongoing screening shall consist of dry weather screening and sampling consistent with part 2.3.4.7.b; wet weather screening and sampling shall also be required at outfalls where wet weather screening was required due to SVFs and shall be conducted in accordance with part 2.3.4.8.c.ii. All sampling results shall be reported in the permittee's annual report. M MA MS4 General Permit 2.3.4.11 Training The permittee shall, at a minimum, annually provide training to employees involved in IDDE program about the program, including how to recognize illicit discharges and SSOs. The permittee shall report on the frequency and type of employee training in the annual report. 2.3.5. Construction Site Stormwater Runoff Control Objective: The objective of an effective construction stormwater runoff control program is to minimize or eliminate erosion and maintain sediment on site so that it is not transported in stormwater and allowed to discharge to a water of the U.S through the permittee's MS4. The construction site stormwater runoff control program required by this permit is a separate and distinct program from EPA's stormwater construction permit program. (http://cfpubl.epa.gov/npdes/stormwater/cgp.cfm) a. Permittees shall implement and enforce a program to reduce pollutants in any stormwater runoff discharged to the MS4 from all construction activities that result in a land disturbance of greater than or equal to one acre within the regulated area. The permittee's program shall include disturbances less than one acre if that disturbance is part of a larger common plan of development or sale that would disturb one or more acres. Permittees authorized under the MS4-2003 permit shall continue to implement and enforce their existing program and modify as necessary to meet the requirements of this part. b. The permittee does not need to apply its construction program requirements to projects that receive a waiver from EPA under the provisions of 40 CFR § 122.26(b) (15) (i). c. The permittee shall develop and implement a construction site runoff control program that includes the elements in Paragraphs i. through v. of this part: An ordinance or regulatory mechanism that requires the use of sediment and erosion control practices at construction sites. In addition to addressing sediment and erosion control, the ordinance must include controls for other wastes on construction sites such as demolition debris, litter and sanitary wastes. Development of an ordinance or other regulatory mechanism was a requirement of the MS4-2003 permit (See part II.B.4 and part IV.B.4).The ordinance or other regulatory mechanism required by the MS4-2003 permit shall have been effective by May 1, 2008. ii. Written (hardcopy or electronic) procedures for site inspections and enforcement of sediment and erosion control measures. If not already existing, these procedures shall be completed within one (1) year from the effective date of the permit. The procedures shall clearly define who is responsible for site inspections as well as who has authority to implement enforcement procedures. The program shall provide that the permittee may, to the extent authorized by law, impose sanctions to ensure compliance with the local program. These procedures and regulatory authorities shall be documented in the SWMP. iii. Requirements for construction site operators performing land disturbance activities within the MS4 jurisdiction that result in stormwater discharges to the MS4 to implement a sediment and erosion control program that includes BMPs appropriate for the conditions at the construction site. The program may include references to BMP WJ MA MS4 General Permit design standards in state manuals, such as the Massachusetts Stormwater Handbook', or design standards developed by the MS4. EPA supports and encourages the use of design standards in local programs. Examples of appropriate sediment and erosion control measures for construction sites include local requirements to: 1. Minimize the amount of disturbed area and protect natural resources; 2. Stabilize sites when projects are complete or operations have temporarily ceased; 3. Protect slopes on the construction site; 4. Protect all storm drain inlets and armor all newly constructed outlets; 5. Use perimeter controls at the site; 6. Stabilize construction site entrances and exits to prevent off -site tracking; 7. Inspect stormwater controls at consistent intervals. iv. Requirements for construction site operators within the MS4 jurisdiction to control wastes, including but not limited to, discarded building materials, concrete truck wash out, chemicals, litter, and sanitary wastes. These wastes may not be discharged to the MS4. v. Written procedures for site plan review and inspection and enforcement. If not already existing, the procedures for site plan review and inspection and enforcement shall be completed within one (1) year from the effective date of the permit. The site plan review procedure shall include a pre -construction review by the permittee of the site design, the planned operations at the construction site, planned BMPs during the construction phase, and the planned BMPs to be used to manage runoff created after development. The review procedure shall incorporate procedures for the consideration of potential water quality impacts, and procedures for the receipt and consideration of information submitted by the public. The site plan review procedure shall also include evaluation of opportunities for use of low impact design and green infrastructure. When the opportunity exists, the permittee shall encourage project proponents to incorporate these practices into the site design. The procedures for site inspections conducted by the permittee shall include the requirement that inspections occur during construction of BMPs as well as after construction of BMPs to ensure they are working as described in the approved plans, clearly defined procedures for inspections including qualifications necessary to perform the inspections, the use of mandated inspection forms if appropriate, and procedure for tracking the number of site reviews, inspections, and enforcement actions. This tracking information shall be included as part of each annual report required by part 4.4. 2.3.6. Stormwater Management in New Development and Redevelopment (Post Construction Stormwater Management) Objective: The objective of this control measure is to reduce the discharge of pollutants found in stormwater through the retention or treatment of stormwater after construction on new or redeveloped sites. For the purposes of this part (2.3.6.), the following definitions apply: site is defined as the area extent of construction activities, including but not limited to the creation of new impervious cover and improvement of existing impervious cover (e.g. repaving not covered by 2.3.6.a.ii.4.d.) ' The handbook is available at: http://www.mass.gov/dep/water/laws/policies.htm#storm 31 MA MS4 General Permit new development is defined as any construction activities or land alteration resulting in total earth disturbances equal to or greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) on an area that has not previously been developed to include impervious cover. redevelopment is defined as any construction, land alteration, or improvement of impervious surfaces resulting in total earth disturbances equal to or greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) that does not meet the definition of new development (see above). a. Permittees shall develop, implement, and enforce a program to address post -construction stormwater runoff from all new development and redevelopment sites that disturb one or more acres and discharge into the permittees MS4 at a minimum. Permittees authorized under the MS4-2003 permit shall continue to implement and enforce their program and modify as necessary to meet the requirements of this part. i. The permittee's new development/ redevelopment program shall include sites less than one acre if the site is part of a larger common plan of development or redevelopment which disturbs one or more acre. ii. The permittee shall develop or modify, as appropriate, an ordinance or other regulatory mechanism within two (2) years of the effective date of the permit to contain provisions that are at least as stringent as the following: 1. Low Impact Development (LID) site planning and design strategies must be used to the maximum extent feasible. 2. The design of treatment and infiltration practices should follow the guidance in Volume 2 of the Massachusetts Stormwater Handbook, as amended, or other federally or State approved10 BMP design guidance. 3. Stormwater management systems on new development sites shall be designed to: a) Not allow new stormwater conveyances to discharge untreated stormwater in accordance with Massachusetts Stormwater Handbook Standard 1; b) Control peak runoff rates in accordance with Massachusetts Stormwater Handbook Standard 211; c) Recharge groundwater in accordance with Massachusetts Stormwater Handbook Standard 3 12 ; d) Eliminate or reduce the discharge of pollutants from land uses with higher pollutant loads as defined in the Massachusetts Stormwater Handbook in accordance with Massachusetts Stormwater Handbook Standard 5; e) Protect Zone II or Interim Wellhead Protection Areas of public water supplies in accordance with Massachusetts Stormwater Handbook Standard 6 13 ; " State approved includes any state in the United States, including, but not limited to, approved guidance by the Commonwealth of Massachusetts 11 Requirement necessary for Section 401 water quality certification by Massachusetts 12 Requirement necessary for Section 401 water quality certification by Massachusetts 13 Requirement necessary for Section 401 water quality certification by Massachusetts id MA MS4 General Permit f) Implement long term maintenance practices in accordance with Massachusetts Stormwater Handbook Standard 9; and g) Require that all stormwater management systems be designed to: 1) Retain the volume of runoff equivalent to, or greater than, one (1.0) inch multiplied by the total post -construction impervious surface area on the site AND/OR 2) Remove 90% of the average annual load of Total Suspended Solids (TSS) generated from the total post -construction impervious area on the site la AND 60% of the average annual load of Total Phosphorus (TP) generated from the total post -construction impervious surface area on the site'a Pollutant removal shall be calculated consistent with EPA Region 1's BMP Performance Extrapolation Tool or other BMP performance evaluation tool provided by EPA Region 1, where available. If EPA Region 1 tools do not address the planned or installed BMP performance any federally or State approved15 BMP design guidance or performance standards (e.g. State stormwater handbooks and design guidance manuals) may be used to calculate BMP performance. 4. Redevelopment Requirements a) Stormwater management systems on Redevelopment sites shall meet the following sections of part 2.3.6.a.ii.3 to the maximum extent feasible: 1) Part 2.3.6.a.ii.3(a) (Massachusetts Stormwater Standard 1); 2) Part 2.3.6.a.ii.3(b) (Massachusetts Stormwater Standard 2); 3) Part 2.3.6.a.ii.3(c) (Massachusetts Stormwater Standard 3); and 4) The pretreatment and structural best management practices requirements of 2.3.6.a.ii.3(d) and 2.3.6.a.ii.3(e) (Massachusetts Stormwater Standards 5 and 6). b) Stormwater management systems on Redevelopment sites shall also improve existing conditions by requiring that stormwater management systems be designed to: 1) Retain the volume of runoff equivalent to, or greater than, 0.80 inch multiplied by the total post -construction impervious surface area on the site AND/OR 2) Remove 80% of the average annual post -construction load of Total Suspended Solids (TSS) generated from the total post -construction impervious area on the site AND 50% of the average annual load of Total Phosphorus (TP) generated from the total post - construction impervious surface area on the site. Pollutant removal shall be calculated consistent with EPA Region 1's BMP Performance Extrapolation Tool or other BMP performance evaluation tool provided by EPA Region 1 where available. If EPA Region 1 tools do not address the planned or installed BMP performance any federally or State approved BMP design guidance or performance standards (e.g. State stormwater handbooks and design guidance manuals) may be used to calculate BMP performance. c) Stormwater management systems on redevelopment sites may utilize offsite mitigation within the same USGS HUC 10 as the redevelopment site la The required removal percentage is not required for each storm,it is the average removal over a year that is required 15 See footnote 14 M1 MA MS4 General Permit to meet the equivalent retention or pollutant removal requirements in part 2.3.6.a.ii.4(b). d) Redevelopment activities that are exclusively limited to maintenance and improvement of existing roadways, (including widening less than a single lane, adding shoulders, correcting substandard intersections, improving existing drainage systems, and repaving projects) shall improve existing conditions where feasible and are exempt from part 2.3.6.a.ii.4(a), part 2.3.6.a.ii.4(b) and part 2.3.6.a.ii.4(c). Roadway widening or improvements that increase the amount of impervious area on the redevelopment site by greater than or equal to a single lane width shall meet the requirements of part 2.3.6.a.ii.4(a) — (c)fully. iii. The permittee shall require, at a minimum, the submission of as -built drawings no later than two (2) years after completion of construction projects. The as -built drawings must depict all on site controls, both structural and non-structural, designed to manage the stormwater associated with the completed site (post construction stormwater management). The new development/redevelopment program shall have procedures to ensure adequate long-term operation and maintenance of stormwater management practices that are put in place after the completion of a construction project. These procedures may include the use of dedicated funds or escrow accounts for development projects or the acceptance of ownership by the permittee of all privately owned BMPs. These procedures may also include the development of maintenance contracts between the owner of the BMP and the permittee. Alternatively, these procedures may include the submission of an annual certification documenting the work that has been done over the last 12 months to properly operate and maintain the stormwater control measures. The procedures to require submission of as -built drawings and ensure long term operation and maintenance shall be a part of the SWMP. The permittee shall report in the annual report on the measures that the permittee has utilized to meet this requirement. b. Within four (4) years of the effective date of this permit, the permittee shall develop a report assessing current street design and parking lot guidelines and other local requirements that affect the creation of impervious cover. This assessment shall be used to provide information to allow the permittee to determine if changes to design standards for streets and parking lots can be made to support low impact design options. If the assessment indicates that changes can be made, the assessment shall include recommendations and proposed schedules to incorporate policies and standards into relevant documents and procedures to minimize impervious cover attributable to parking areas and street designs. The permittee shall implement all recommendations, in accordance with the schedules, contained in the assessment. The local planning board and local transportation board should be involved in this assessment. This assessment shall be part of the SWMP. The permittee shall report in each annual report on the status of this assessment including any planned or completed changes to local regulations and guidelines. c. Within four (4) years from the effective date of the permit, the permittee shall develop a report assessing existing local regulations to determine the feasibility of making, at a minimum, the following practices allowable when appropriate site conditions exist: i. Green roofs; ii. Infiltration practices such as rain gardens, curb extensions, planter gardens, porous and pervious pavements, and other designs to manage stormwater using landscaping and structured or augmented soils; and M, MA MS4 General Permit iii. Water harvesting devices such as rain barrels and cisterns, and the use of stormwater for non -potable uses. The assessment should indicate if the practices are allowed in the MS4 jurisdiction and under what circumstances are they allowed. If the practices are not allowed, the permittee shall determine what hinders the use of these practices, what changes in local regulations may be made to make them allowable, and provide a schedule for implementation of recommendations. The permittee shall implement all recommendations, in accordance with the schedules, contained in the assessment. The permittee shall report in each annual report on its findings and progress towards making the practices allowable. (Information available at: http://www.epa. og v/re iog nl/npdes/stormwater/assets/pdf/AddressingBarrier2LID.pdf and http://www.mgpc.or resources/low-impact-dev-toolkit/local-codes-lid) d. Four (4) years from the effective date of this permit, the permittee shall identify a minimum of 5 permittee-owned properties that could potentially be modified or retrofitted with BMPs designed to reduce the frequency, volume, and pollutant loads of stormwater discharges to and from its MS4 through the reduction of impervious area. Properties and infrastructure for consideration shall include those with the potential for reduction of on -site impervious area (IA) as well as those that could provide reduction of off -site IA. At a minimum, the permittee shall consider municipal properties with significant impervious cover (including parking lots, buildings, and maintenance yards) that could be modified or retrofitted. MS4 infrastructure to be considered includes existing street right-of-ways, outfalls and conventional stormwater conveyances and controls (including swales and detention practices) that could be readily modified or retrofitted to provide reduction in frequency, volume or pollutant loads of such discharges through reduction of impervious cover. In determining the potential for modifying or retrofitting particular properties, the permittee shall consider factors such as access for maintenance purposes; subsurface geology; depth to water table; proximity to aquifers and subsurface infrastructure including sanitary sewers and septic systems; and opportunities for public use and education. In determining its priority ranking, the permittee shall consider factors such as schedules for planned capital improvements to storm and sanitary sewer infrastructure and paving projects; current storm sewer level of service; and control of discharges to water quality limited waters, first or second order streams, public swimming beaches, drinking water supply sources and shellfish growing areas. Beginning with the fifth year annual report and in each subsequent annual report, the permittee shall identify additional permittee owned sites and infrastructure that could be retrofitted such that the permittee maintains a minimum of 5 sites in their inventory, until such a time as when the permittee has less than 5 sites remaining. In addition, the permittee shall report on all properties that have been modified or retrofitted with BMPs to mitigate IA that were inventoried in accordance with this part. The permittee may also include in its annual report non-MS4 owned property that has been modified or retrofitted with BMPs to mitigate IA. 2.3.7. Good House Keeping and Pollution Prevention for Permittee Owned Operations Objective: The permittee shall implement an operations and maintenance program for permittee-owned operations that has a goal of preventing or reducing pollutant runoff and protecting water quality from all permittee-owned operations. a. Operations and Maintenance Programs i. Within two (2) years from the effective date of the permit, the permittee shall develop, if not already developed, written (hardcopy or electronic) operations and maintenance WA MA MS4 General Permit procedures for the municipal activities listed below in part 2.3.7.a.ii. These written procedures shall be included as part of the SWMP. ii. Within two (2) year of the effective date of this permit, the permittee shall develop an inventory of all permittee owned facilities within the categories listed below. The permittee shall review this inventory annually and update as necessary. Parks and open space: Establish procedures to address the proper use, storage, and disposal of pesticides, herbicides, and fertilizers including minimizing the use of these products and using only in accordance manufacturer's instruction. Evaluate lawn maintenance and landscaping activities to ensure practices are protective of water quality. Protective practices include reduced mowing frequencies, proper disposal of lawn clippings, and use of alternative landscaping materials (e.g., drought resistant planting). Establish pet waste handling collection and disposal locations at all parks and open space where pets are permitted, including the placing of proper signage concerning the proper collection and disposal of pet waste. Establish procedures to address waterfowl congregation areas where appropriate to reduce waterfowl droppings from entering the MS4. Establish procedures for management of trash containers at parks and open space (scheduled cleanings; sufficient number). Establish procedures to address erosion or poor vegetative cover when the permittee becomes aware of it; especially if the erosion is within 50 feet of a surface water. 2. Buildings and facilities where pollutants are exposed to stormwater runoff. This includes schools (to the extent they are permittee-owned or operated), town offices, police, and fire stations, municipal pools and parking garages and other permittee-owned or operated buildings or facilities. Evaluate the use, storage, and disposal of petroleum products and other potential stormwater pollutants. Provide employee training as necessary so that those responsible for handling these products know proper procedures. Ensure that Spill Prevention Plans are in place, if applicable, and coordinate with the fire department as necessary. Develop management procedures for dumpsters and other waste management equipment. Sweep parking lots and keep areas surrounding the facilities clean to reduce runoff of pollutants. Vehicles and Equipment: Establish procedures for the storage of permittee vehicles. Vehicles with fluid leaks shall be stored indoors or containment shall be provided until repaired. Evaluate fueling areas owned or operated by the permittee. If possible, place fueling areas under cover in order to minimize exposure. Establish procedures to ensure that vehicle wash waters are not discharged to the municipal storm sewer system or to surface waters. This permit does not authorize such discharges. iii. Infrastructure Operations and Maintenance 1. The permittee shall establish within two (2) year of the effective date of the permit a written (hardcopy or electronic) program detailing the activities and procedures the permittee will implement so that the MS4 infrastructure is maintained in a timely manner to reduce the discharge of pollutants from the MS4. If the permittee has an existing program to maintain its MS4 infrastructure !f:3 MA MS4 General Permit in a timely manner to reduce or eliminate the discharge of pollutants from the MS4, the permittee shall document the program in the SWMP. 2. The permittee shall optimize routine inspections, cleaning and maintenance of catch basins such that the following conditions are met: • Prioritize inspection and maintenance for catch basins located near construction activities (roadway construction, residential, commercial, or industrial development or redevelopment). Clean catch basins in such areas more frequently if inspection and maintenance activities indicate excessive sediment or debris loadings. • Establish a schedule with a goal that the frequency of routine cleaning will ensure that no catch basin at anytime will be more than 50 percent full. • If a catch basin sump is more than 50 percent full during two consecutive routine inspections/cleaning events, the permittee shall document that finding, investigate the contributing drainage area for sources of excessive sediment loading, and to the extent practicable, abate contributing sources. The permittee shall describe any actions taken in its annual report. • For the purposes of this part, an excessive sediment or debris loading is a catch basin sump more than 50 percent full. A catch basin sump is more than 50 percent full if the contents within the sump exceed one half the distance between the bottom interior of the catch basin to the invert of the deepest outlet of the catch basin. • The permittee shall document in the SWMP and in the first annual report its plan for optimizing catch basin cleaning, inspection plans, or its schedule for gathering information to develop the optimization plan. Documentation shall include metrics and other information used to reach the determination that the established plan for cleaning and maintenance is optimal for the MS4. The permittee shall keep a log of catch basins cleaned or inspected. • The permittee shall report in each annual report the total number of catch basins, number inspected, number cleaned, and the total volume or mass of material removed from all catch basins. The permittee shall establish and implement procedures for sweeping and/or cleaning streets, and permittee-owned parking lots. All streets with the exception of rural uncurbed roads with no catch basins or high speed limited access highways shall be swept and/or cleaned a minimum of once per year in the spring (following winter activities such as sanding). The procedures shall also include more frequent sweeping of targeted areas determined by the permittee on the basis of pollutant load reduction potential, based on inspections, pollutant loads, catch basin cleaning or inspection results, land use, water quality limited or TMDL waters or other relevant factors as determined by the permittee. The permittee shall report in each annual report the number of miles cleaned or the volume or mass of material removed. For rural uncurbed roadways with no catch basins and limited access highways, the permittee shall either meet the minimum frequencies above, or develop and implement an inspection, documentation and targeted sweeping plan within two (2) years of the effective date of the permit, and submit such plan with its year one annual report. M MA MS4 General Permit 4. The permittee shall ensure proper storage of catch basin cleanings and street sweepings prior to disposal or reuse such that they do not discharge to receiving waters. These materials should be managed in compliance with current MassDEP policies: For catch basins cleanings: http://www.mass.gov/eea/agencies/massdep/recycle/regulations/manageme nt-of-catch-basin-cleanings.html For street sweepings: http://www.mass.gov/eea/docs/dep/recycle/laws/stsweep.pd The permittee shall establish and implement procedures for winter road maintenance including the use and storage of salt and sand; minimize the use of sodium chloride and other salts, and evaluate opportunities for use of alternative materials; and ensure that snow disposal activities do not result in disposal of snow into waters of the United States. For purposes of this MS4 Permit, salt shall mean any chloride -containing material used to treat paved surfaces for deicing, including sodium chloride, calcium chloride, magnesium chloride, and brine solutions. The permittee shall establish and implement inspection and maintenance frequencies and procedures for all stormwater treatment structures such as water quality swales, retention/detention basins, infiltration structures, proprietary treatment devices or other similar structures. All permittee-owned stormwater treatment structures (excluding catch basins) shall be inspected annually at a minimum. iv. The permittee shall report in the annual report on the status of the inventory required by this part and any subsequent updates; the status of the O&M programs for the permittee- owned facilities and activities in part 2.3.7.a.ii; and the maintenance activities associated with each. v. The permittee shall keep a written (hardcopy or electronic) record of all required activities including but not limited to maintenance activities, inspections and training required by part 2.3.7.a. The permittee shall maintain, consistent with part 4.2.a, all records associated with maintenance and inspection activities required by part 2.3.7.a. b. Stormwater Pollution Prevention Plan (SWPPP) The permittee shall develop and fully implement a SWPPP for each of the following permittee-owned or operated facilities: maintenance garages, public works yards, transfer stations, and other waste handling facilities where pollutants are exposed to stormwater as determined by the permittee. If facilities are located at the same property, the permittee may develop one SWPPP for the entire property. The SWPPP is a separate and different document from the SWMP required in part 1.10. A SWPPP does not need to be developed for a facility if the permittee has either developed a SWPPP or received a no exposure certification for the discharge under the Multi -Sector General Permit or the discharge is authorized under another NPDES permit. i. No later than two (2) years from the effective date of the permit, the permittee shall develop and implement a written (hardcopy or electronic) SWPPP for the facilities W MA MS4 General Permit described above. The SWPPP shall be signed in accordance with the signatory requirements of Appendix B — Subparagraph 11. ii. The SWPPP shall contain the following elements: 1. Pollution Prevention Team Identify the staff on the team, by name and title. If the position is unstaffed, the title of the position should be included and the SWPPP updated when the position is filled. The role of the team is to develop, implement, maintain, and revise, as necessary, the SWPPP for the facility. 2. Description of the facility and identification of potential pollutant sources The SWPPP shall include a map of the facility and a description of the activities that occur at the facility. The map shall show the location of the stormwater outfalls, receiving waters, and any structural controls. Identify all activities that occur at the facility and the potential pollutants associated with each activity including the location of any floor drains. These may be included as part of the inventory required by part 2.3.7.a. 3. Identification of stormwater controls The permittee shall select, design, install, and implement the control measures detailed in paragraph 4 below to prevent or reduce the discharge of pollutants from the permittee owned facility. The selection, design, installation, and implementation of the control measures shall be in accordance with good engineering practices and manufacturer's specifications. The permittee shall also take all reasonable steps to control or address the quality of discharges from the site that may not originate at the facility. If the discharge from the facility is to a water quality limited water and the facility has the potential to discharge the pollutant identified as causing the water quality limitation, the permittee shall identify the control measures that will be used to address this pollutant at the facility so that the discharge does not cause or contribute to a violation of a water quality standard. 4. The SWPPP shall include the following management practices: a) Minimize or Prevent Exposure: The permittee shall to the extent practicable either locate materials and activities inside, or protect them with storm -resistant coverings in order to prevent exposure to rain, snow, snowmelt and runoff (although significant enlargement of impervious surface area is not recommended). Materials do not need to be enclosed or covered if stormwater runoff from affected areas will not be discharged directly or indirectly to surface waters or to the MS4 or if discharges are authorized under another NPDES permit. b) Good Housekeeper: The permittee shall keep clean all exposed areas that are potential sources of pollutants, using such measures as sweeping at regular intervals. Ensure that trash containers are closed when not in use, keep storage areas well swept and free from leaking or damaged containers; and store leaking vehicles needing repair indoors. 51 MA MS4 General Permit c) Preventative Maintenance: The permittee shall regularly inspect, test, maintain, and repair all equipment and systems to avoid situations that may result in leaks, spills, and other releases of pollutants in stormwater to receiving waters. Inspections shall occur at a minimum once per quarter. d) Spill Prevention and Response: The permittee shall minimize the potential for leaks, spills, and other releases that may be exposed to stormwater and develop plans for effective response to such spills if or when they occur. At a minimum, the permittee shall have procedures that include: Preventive measures such as barriers between material storage and traffic areas, secondary containment provisions, and procedures for material storage and handling. Response procedures that include notification of appropriate facility personnel, emergency agencies, and regulatory agencies, and procedures for stopping, containing, and cleaning up leaks, spills and other releases. Measures for cleaning up hazardous material spills or leaks shall be consistent with applicable Resource Conservation and Recovery Act (RCRA) regulations at 40 CFR section 264 and 40 CFR section 265. Employees who may cause, detect, or respond to a spill or leak shall be trained in these procedures and have necessary spill response equipment available. If possible, one of these individuals should be a member of the Pollution Prevention Team; and Contact information for individuals and agencies that shall be notified in the event of a leak, spill, or other release. Where a leak, spill, or other release containing a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under 40 CFR section 110, 40 CFR section 117, or 40 CFR section 302, occurs during a 24-hour period, the permittee shall notify the National Response Center (NRC) at (800) 424-8802 in accordance with the requirements of 40 CFR section 110, 40 CFR section 117, and 40 CFR section 302 as soon as the permittee has knowledge of the discharge. State or local requirements may necessitate reporting spills or discharges to local emergency, public health or drinking water supply agencies, and owners of public drinking water supplies. Contact information shall be in locations that are readily accessible and available. e) Erosion and Sediment Control: The permittee shall use structural and non-structural control measures at the facility to stabilize and contain runoff from exposed areas and to minimize or eliminate onsite erosion and sedimentation. Efforts to achieve this may include the use of flow velocity dissipation devices at discharge locations and within outfall channels where necessary to reduce erosion. Wj MA MS4 General Permit f) Management of Runoff. The permittee shall manage stormwater runoff from the facility to prevent or reduce the discharge of pollutants. This may include management practices which divert runoff from areas that are potential sources of pollutants, contain runoff in such areas, or reuse, infiltrate or treat stormwater to reduce the discharge of pollutants. g) Salt Storage Piles or Piles Containing Salt: For storage piles of salt or piles containing salt used for deicing or other purposes (including maintenance of paved surfaces) for which the discharge during precipitation events discharges to the permittee's MS4, any other storm sewer system, or to a Water of the US, the permittee shall prevent exposure of the storage pile to precipitation by enclosing or covering the storage piles. Such piles shall be enclosed or covered within two (2) years of the permit effective date. The permittee shall implement appropriate measures (e.g., good housekeeping, diversions, containment) to minimize exposure resulting from adding to or removing materials from the pile. The permittee is encouraged to store piles in such a manner as not to impact surface water resources, ground water resources, recharge areas, and wells. h) Employee Training: The permittee shall regularly train employees who work in areas where materials or activities are exposed to stormwater, or who are responsible for implementing activities identified in the SWPPP (e.g., inspectors, maintenance personnel), including all members of the Pollution Prevention Team. Training shall cover both the specific components and scope of the SWPPP and the control measures required under this part, including spill response, good housekeeping, material management practices, any best management practice operation and maintenance, etc. EPA recommends annual training. The permittee shall document the following information for each training: • The training date, title and training duration; • List of municipal attendees; • Subjects covered during training i) Maintenance of Control Measures: The permittee shall maintain all control measures, required by this permit in effective operating condition. The permittee shall keep documentation onsite that describes procedures and a regular schedule for preventative maintenance of all control measures and discussions of back-up practices in place should a runoff event occur while a control measure is off-line. Nonstructural control measures shall also be diligently maintained (e.g., spill response supplies available, personnel trained). iii. The permittee shall conduct the following inspections: 1. Site Inspections: Inspect all areas that are exposed to stormwater and all stormwater control measures. Inspections shall be conducted at least once each calendar quarter. More frequent inspections may be required if significant activities are exposed to stormwater. Inspections shall be performed when the 6191 MA MS4 General Permit facility is in operation. At least one of the quarterly inspections shall occur during a period when a stormwater discharge is occurring. The permittee shall document the following information for each facility inspection: • The inspection date and time; • The name of the inspector; • Weather information and a description of any discharge occurring at the time of the inspection; • Identification of any previously unidentified discharges from the site; • Any control measures needing maintenance or repair; • Any failed control measures that need replacement. • Any SWPPP changes required as a result of the inspection. If during the inspections, or any other time, the permittee identifies control measures that need repair or are not operating effectively, the permittee shall repair or replace them before the next anticipated storm event if possible, or as soon as practicable following that storm event. In the interim, the permittee shall have back-up measures in place. The permittee shall report the findings from the Site Inspections in the annual report. iv. The permittee must keep a written (hardcopy or electronic) record of all required activities including but not limited to maintenance, inspections, and training required by part 2.3.7.b.The permittee shall maintain all records associated with the development and implementation of the SWPPP required by this part consistent with the requirements of part 4.2. 3.0. Additional Requirements for Discharges to Surface Drinking Water Supplies and Their Tributaries a. Permittees which discharge to public surface drinking water supply sources (Class A and Class B surface waters used for drinking water) or their tributaries should consider these waters a priority in the implementation of the SWMP. b. Permittees should provide pretreatment and spill control measures to stormwater discharges to public drinking water supply sources or their tributaries to the extent feasible. c. Direct discharges to Class A waters should be avoided to the extent feasible. 4.0. Program Evaluation, Record Keeping, and Reporting 4.1. Program Evaluation a. The permittee shall annually self -evaluate its compliance with the terms and conditions of this permit and submit each self -evaluation in the Annual Report. The permittee shall also maintain the annual evaluation documentation as part of the SWMP. MA MS4 General Permit b. The permittee shall evaluate the appropriateness of the selected BMPs in achieving the objectives of each control measure and the defined measurable goals. Where a BMP is found to be ineffective the permittee shall change BMPs in accordance with the provisions below. In addition, permittees may augment or change BMPs at any time following the provisions below: Changes adding (but not subtracting or replacing) components or controls may be made at any time. Changes replacing an ineffective or infeasible BMP specifically identified in the SWMP with an alternative BMP may be made as long as the basis for the changes is documented in the SWMP by, at a minimum: • An analysis of why the BMP is ineffective or infeasible; • Expectations on the effectiveness of the replacement BMP; and • An analysis of why the replacement BMP is expected to achieve the defined goals of the BMP to be replaced. The permittee shall indicate BMP modifications along with a brief explanation of the modification in each Annual Report. c. EPA or MassDEP may require the permittee to add, modify, repair, replace or change BMPs or other measures described in the annual reports as needed: • To address impacts to receiving water quality caused or contributed to by discharges from the MS4; or • To satisfy conditions of this permit Any changes requested by EPA or MassDEP will be in writing and will set forth the schedule for the permittee to develop the changes and will offer the permittee the opportunity to propose alternative program changes to meet the objective of the requested modification. 4.2. Record Keeping a. The permittee shall keep all records required by this permit for a period of at least five years. EPA may extend this period at any time. Records include information used in the development of any written (hardcopy or electronic) program required by this permit, any monitoring results, copies of reports, records of screening, follow-up and elimination of illicit discharges; maintenance records; inspection records; and data used in the development of the notice of intent, SWMP, SWPPP, and annual reports. This list provides examples of records that should be maintained, but is not all inclusive. b. Records other than those required to be included in the annual report, part 4.4, shall be submitted only when requested by the EPA or the MassDEP. c. The permittee shall make the records relating to this permit, including the written (hardcopy or electronic) stormwater management program, available to the public. The public may view the records during normal business hours. The permittee may charge a reasonable fee for copying requests. The permittee is encouraged to satisfy this requirement by posting records online. 4.3. Outfall Monitoring Reporting M MA MS4 General Permit a. The permittee shall monitor and sample its outfalls at a minimum through sampling and testing at the frequency and locations required in connection with IDDE screening under part 2.3.4.7.b. and 2.3.4.8.c.ii.2. The monitoring program may also include additional outfall and interconnection monitoring as determined by the permittee in connection with assessment of SWMP effectiveness pursuant to part 4.1; evaluation of discharges to water quality limited waters pursuant to part 2.2; assessment of BMP effectiveness pursuant to part 2.2 or 2.3; or otherwise. b. The permittee shall document all monitoring results each year in the annual report. The report shall include the date, outfall or interconnection identifier, location, weather conditions at time of sampling, precipitation in previous 48 hours, field screening parameter results, and results of all analyses. The annual report shall include all of this information and data for the current reporting period and for the entire permit period. c. The permittee shall also include in the annual report results from any other stormwater or receiving water quality monitoring or studies conducted during the reporting period where that data is being used by the permittee to inform permit compliance or program effectiveness. If such monitoring or studies were conducted on behalf of the permittee, or if monitoring or studies conducted by other entities were reported to the permittee, a brief description of the type of information gathered or received shall be included in the annual report(s) covering the time period(s) the information was received. 4.4. Annual Reports a. The permittee shall submit annual reports each year of the permit term. The reporting period will be a one year period commencing on the permit effective date, and subsequent anniversaries thereof, except that the first annual report under this permit shall also cover the period from May 1, [year of final permit effective date] to the permit effective date. The annual report is due ninety days from the close of each reporting period. b. The annual reports shall contain the following information: i. A self -assessment review of compliance with the permit terms and conditions. ii. An assessment of the appropriateness of the selected BMPs. iii. The status of any plans or activities required by part 2.1 and/ or part 2.2, including: Identification of all discharges determined to be causing or contributing to an exceedance of water quality standards and description of response including all items required by part 2.1.1; For discharges subject to TMDL related requirements, identification of specific BMPs used to address the pollutant identified as the cause of impairment and assessment of the BMPs effectiveness at controlling the pollutant (part 2.2.1. and Appendix F) and any deliverables required by Appendix F; For discharges to water quality limited waters a description of each BMP required by Appendix H and any deliverables required by Appendix H. iv. An assessment of the progress towards achieving the measurable goals and objectives of each control measure in part 2.3 including: 6TO MA MS4 General Permit • Evaluation of the public education program including a description of the targeted messages for each audience; method of distribution and dates of distribution; methods used to evaluate the program; and any changes to the program. • Description of the activities used to promote public participation including documentation of compliance with state public notice regulations. • Description of the activities related to implementation of the IDDE program including: status of the map; status and results of the illicit discharge potential ranking and assessment; identification of problem catchments; status of all protocols described in part 2.3.4.(program responsibilities and systematic procedure); number and identifier of catchments evaluated; number and identifier of outfalls screened; number of illicit discharges located; number of illicit discharges removed; gallons of flow removed; identification of tracking indicators and measures of progress based on those indicators; and employee training. • Evaluation of the construction runoff management including number of project plans reviewed; number of inspections; and number of enforcement actions. • Evaluation of stormwater management for new development and redevelopment including status of ordinance development (2.3.6.a.ii.), review and status of the street design assessment(2.3.6.b.), assessments to barriers to green infrastructure (2.3.6.c), and retrofit inventory status (2.3.6.d.) • Status of the O&M Programs required by part 2.3.7.a. • Status of SWPPP required by part 2.3.7.b. including inspection results. • Any additional reporting requirements in part 3.0. v. All outfall screening and monitoring data collected by or on behalf of the permittee during the reporting period and cumulative for the permit term, including but not limited to all data collected pursuant to part 2.3.4. The permittee shall also provide a description of any additional monitoring data received by the permittee during the reporting period. vi. Description of activities for the next reporting cycle. vii. Description of any changes in identified BMPs or measurable goals. viii. Description of activities undertaken by any entity contracted for achieving any measurable goal or implementing any control measure. c. Reports shall be submitted to EPA at the following address: United State Environmental Protection Agency Stormwater and Construction Permits Section (OEP06-1) Five Post Office Square, Suite 100 Boston, MA 02109 Massachusetts Department of Environmental Protection One Winter Street — 5th Floor Boston, MA 02108 ATTN: Frederick Civian MA MA MS4 General Permit Or submitted electronically to EPA at the following email address: stormwater.reports&epa.goe. After December 21, 2020 all Annual Reports must be submitted electronically. 5.0. Non -Traditional MS4s Non-traditional MS4s are MS4s owned and operated by the Commonwealth of Massachusetts, counties or other public agencies within the Commonwealth of Massachusetts, and properties owned and operated by the United States (Federal Facilities) within the Commonwealth of Massachusetts. This part addresses all non-traditional MS4s except MS4s that are owned or operated by transportation agencies, which are addressed in part 6.0 below. 5.1. Requirements for Non -Traditional MS4s All requirements and conditions of parts 1 — 4 above apply to all Non-traditional MS4s, except as specifically provided below: 5.1.1. Public education For the purpose of this permit, the audiences for a Non-traditional MS4 include the employees, clients and customers (including students at education MS4s), visitors to the property, tenants, long term contractors and any other contractors working at the facility where the MS4 is located. The permittee may use some of the educational topics included in part 2.3.2.d. as appropriate, or may focus on topics specific to the MS4. The permittee shall document the educational topics for each target audience in the SWMP and annual reports. 5.1.2. Ordinances and regulatory mechanisms Some Non-traditional MS4s may not have authority to enact an ordinance, by-law, or other regulatory mechanisms. MS4s without the authority to enact an ordinance shall ensure that written policies or procedures are in place to address the requirements of part 2.3.4.5., part 2.3.4.6 and part 2.3.6.a. 5.1.3. Assessment of Regulations Non-traditional MS4s do not need to meet the requirements of part 2.3.6.c. 5.1.4. New Dischargers New MS4 facilities are subject to additional water quality -based requirements if they fall within the definition of "new discharger" under 40 CFR § 122.2: "A new discharger is any building, structure, facility or installation (a) from which there is or may be a `discharge of pollutants' (b) that did not commence the `discharge of pollutants' at a particular `site' prior to August 13, 1979; (c) which is not a `new source'; and (d) which never received a finally effective NPDES permit for discharges at that `site.' The term "site" is defined in § 122.2 to mean "the land or water area where any'facility or activity' is physically located or conducted including adjacent land used in connection with the facility or activity." Consistent with these definitions, a Non-traditional MS4 is a "new discharger" if it discharges stormwater from a new facility with an entirely new separate storm sewer system that is not 6W MA MS4 General Permit physically located on the same or adjacent land as an existing facility and associated system operated by the same MS4. Any Non-traditional MS4 facility that is a "new discharger" and discharges to a waterbody listed in category 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b) due to nutrients (Total Nitrogen or Total Phosphorus), metals (Cadmium, Copper, Iron, Lead or Zinc), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enteroccus or Fecal Coliform), chloride (Chloride) or oil and grease (Petroleum Hydrocarbons or Oil and Grease), or discharges to a waterbody with an approved TMDL for any of those pollutants, is not eligible for coverage under this permit and shall apply for an individual permit. Any Non-traditional MS4 facility that is a "new discharger" and discharges to a waterbody that is in attainment is subject to Massachusetts antidegradation regulations at 314 CMR 4.04. The permittee shall comply with the provisions of 314 CMR 4.04 including information submittal requirements and obtaining authorization for new discharges where appropriate16. Any authorization of new discharges by MassDEP shall be incorporated into the permittee's SWMP. If an applicable MassDEP approval specifies additional conditions or requirements, then those requirements are incorporated into this permit by reference. The permittee must comply with all such requirements. 6.0 Requirements for MS4s Owned or Operated by Transportation Agencies This part applies to all MS4s owned or operated by any state or federal transportation agency (except Massachusetts Department of Transportation—MassDOT- Highway Division, which is subject to a separate individual permit). All requirements and conditions of this permit apply with the following exceptions: 6.1 Public education For the purpose of this permit, the audiences for a transportation agency education program include the general public (users of the roadways), employees, and any contractors working at the location. The permittee may use some of the educational topics included in part 2.3.2.d. as appropriate, or may focus on topics specific to the agency. The permittee shall document the educational topics for each target audience. 6.2 Ordinances and regulatory mechanisms The transportation agency may not have authority to enact an ordinance, by-law or other regulatory mechanisms. The agency shall ensure that written agency policies or procedures are in place to address the requirements of part 2.3.4.5., part 2.3.4.6 and part 2.3.6.a. 6.3 Assessment of regulations Non-traditional MS4s do not need to meet the requirements of part 2.3.6.c. 6.4 New Dischargers New MS4 facilities are subject to additional water quality -based requirements if they fall within the definition of "new dischargers" under 40 CFR § 122.2: "A new discharger is any building, structure, facility or installation (a) from which there is or may be a `discharge of pollutants' (b) that did not commence the `discharge of pollutants' at a particular `site' prior to August 13, 1979; (c) which is not a `new source'; and (d) which never received a finally effective NPDES permit for discharges at that `site.' The term "site" is defined 16 Contact MassDEP for guidance on compliance with 314 CMR 4.04 fig MA MS4 General Permit in § 122.2 to mean "the land or water area where any 'facility or activity' is physically located or conducted including adjacent land used in connection with the facility or activity." Consistent with these definitions, a new transportation MS4 is a "new discharger" if it discharges stormwater from a new facility with an entirely new separate storm sewer system that is not physically located on the same or adjacent land as an existing facility and associated system operated by the same MS4. Any transportation MS4 facility that is a "new discharger" and discharges to a waterbody listed as impaired in category 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b) due to nutrients (Total Nitrogen or Total Phosphorus), metals (Cadmium, Copper, Iron, Lead or Zinc), solids (TSS or Turbidity), bacteria/pathogens (E. Coli, Enteroccus or Fecal Coliform), chloride (Chloride) or oil and grease (Petroleum Hydrocarbons or Oil and Grease), or discharges to a waterbody with an approved TMDL for any of those pollutants, is not eligible for coverage under this permit and shall apply for an individual permit. Any transportation MS4 facility that is a "new discharger" and discharges to a waterbody that is in attainment is subject to Massachusetts antidegradation regulations at 314 CMR 4.04. The permittee shall comply with the provisions of 314 CMR 4.04 including information submittal requirements and obtaining authorization for new discharges where appropriates'. Any authorization of new discharges by MassDEP shall be incorporated into the permittee's SWMP. If an applicable MassDEP approval specifies additional conditions or requirements, then those requirements are incorporated into this permit by reference. The permittee must comply with all such requirements. " Contact MassDEP for guidance on compliance with 314 CMR 4.04 re MA MS4 General Permit Appendix A Appendix A Definitions, Abbreviations and Acronyms Definitions Best Management Practices (BMPs) - schedules of activities, practices (and prohibitions of practices), structures, vegetation, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants to waters of the United States. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. Common Plan of Development - A "larger common plan of development or sale" is a contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules under one plan. For example, if a developer buys a 20-acre lot and builds roads, installs pipes, and runs electricity with the intention of constructing homes or other structures sometime in the future, this would be considered a larger common plan of development or sale. If the land is parceled off or sold, and construction occurs on plots that are less than one acre by separate, independent builders, this activity still would be subject to stormwater permitting requirements if the smaller plots were included on the original site plan. Control Measure - refers to any BMP or other method (including effluent limitations) used to prevent or reduce the discharge of pollutants to waters of the United States. Director - a Regional Administrator of the Environmental Protection Agency or an authorized representative. Discharge - when used without qualification, means the "discharge of a pollutant." Discharge of a pollutant - any addition of any "pollutant" or combination of pollutants to "waters of the United States" from any "point source," or any addition of any pollutant or combination of pollutants to the waters of the "contiguous zone" or the ocean from any point source other than a vessel or other floating craft which is being used as a means of transportation. This includes additions of pollutants into waters of the United States from surface runoff which is collected or channeled by man; or discharges through pipes, sewers, or other conveyances, leading into privately owned treatment works. Discharge -related activities - activities which cause, contribute to, or result in stormwater and allowable non-stormwater point source discharges, and measures such as the siting, construction and operation of BMPs to control, reduce, or prevent pollution in the discharges. Disturbance - action to alter the existing vegetation and/or underlying soil of a site, such as clearing, grading, site preparation (e.g., excavating, cutting, and filling), soil compaction, and movement and stockpiling of top soils. Page 1 of 8 MA MS4 General Permit Appendix A Existing Discharger — an operator applying for coverage under this permit for discharges covered previously under an NPDES general or individual permit. Facility or Activity - any NPDES "point source" or any other facility or activity (including land or appurtenances thereto) that is subject to regulation under the NPDES program. Federal Facility — Any buildings, installations, structures, land, public works, equipment, aircraft, vessels, and other vehicles and property, owned by, or constructed or manufactured for the purpose of leasing to, the federal government. Illicit Discharge - any discharge to a municipal separate storm sewer that is not composed entirely of stormwater except discharges pursuant to a NPDES permit (other than the NPDES permit for discharges from the municipal separate storm sewer) and discharges resulting from fire fighting activities. Impaired Water — A water is impaired if it does not meet one or more of its designated use(s). For purposes of this permit, "impaired" refers to categories 4 and 5 of the five - part categorization approach used for classifying the water quality standards attainment status for water segments under the TMDL program. Impaired waters compilations are also sometimes referred to as "303(d) lists." Category 5 waters are impaired because at least one designated use is not being supported or is threatened and a TMDL is needed. Category 4 waters indicate that at least one designated use is not being supported but a TMDL is not needed (4a indicates that a TMDL has been approved or established by EPA; 4b indicates other required control measures are expected in result in the attainment of water quality standards in a reasonable period of time; and 4c indicates that the non - attainment of the water quality standard is the result of pollution (e.g. habitat) and is not caused by a pollutant). See USEPA's 2006Integrated Report Guidance, July 29, 2005 for more detail on the five part categorization of waters [under EPA National TMDL Guidance http://www.epa.gov/owow/tmdl/policy.html]). Impervious Surface- Any surface that prevents or significantly impedes the infiltration of water into the underlying soil. This can include but is not limited to: roads, driveways, parking areas and other areas created using non porous material; buildings, rooftops, structures, artificial turf and compacted gravel or soil. Industrial Activity - the ten categories of industrial activities included in the definition of "stormwater discharges associated with industrial activity," as defined in 40 CFR 122.26(b)(14)(i)-(ix) and (xi). Industrial Stormwater - stormwater runoff associated with the definition of "stormwater discharges associated with industrial activity." Interconnection — the point (excluding sheet flow over impervious surfaces) where the permittee's MS4 discharges to another MS4 or other storm sewer system, through which the discharge is eventually conveyed to a water of the United States. Interconnections shall be treated similarly to outfalls throughout the permit. Page 2 of 8 MA MS4 General Permit Appendix A Junction Manhole - For the purposes of this permit, a junction manhole is a manhole or structure with two or more inlets accepting flow from two or more MS4 alignments. Manholes with inlets solely from private storm drains, individual catch basins, or both are not considered junction manholes for these purposes. Key Junction Manhole - For the purposes of this permit, key junction manholes are those junction manholes that can represent one or more junction manholes without compromising adequate implementation of the illicit discharge program. Adequate implementation of the illicit discharge program would not be compromised if the exclusion of a particular junction manhole as a key junction manhole would not affect the permittee's ability to determine the possible presence of an upstream illicit discharge. A permittee may exclude a junction manhole located upstream from another located in the immediate vicinity or that is serving a drainage alignment with no potential for illicit connections. Municipal Separate Storm Sewer - a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man- made channels, or storm drains): (i) Owned or operated by a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States; (ii) Designed or used for collecting or conveying stormwater; (iii) Which is not a combined sewer; and (iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2. Municipal Separate Storm Sewer System (MS4) - means all separate storm sewers that are defined as "large" or "medium" or "small" municipal storm sewer systems pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). For the purposes of this permit "MS4" may also refer to the permittee with jurisdiction over the sewer system. New Development — any construction activities or land alteration resulting in total earth disturbances greater than 1 acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) on an area that has not previously been developed to include impervious cover. (see part 2.3.6. of the permit) New Discharger — For the purposes of this permit, a new discharger is an entity that discharges stormwater from a new facility with an entirely new separate storm sewer system that is not physically located on the same or adjacent land as an existing facility and associated system operated by the same MS4. Page 3 of 8 MA MS4 General Permit Appendix A New Source - any building, structure, facility, or installation from which there is or may be a "discharge of pollutants," the construction of which commenced: S after promulgation of standards of performance under section 306 of the CWA which are applicable to such source, or S after proposal of standards of performance in accordance with section 306 of the CWA which are applicable to such source, but only if the standards are promulgated in accordance with section 306 within 120 days of their proposal. New Source Performance Standards (NSPS) — Technology -based standards for facilities that qualify as new sources under 40 CFR 122.2 and 40 CFR 122.29. No exposure - all industrial materials or activities are protected by a storm -resistant shelter to prevent exposure to rain, snow, snowmelt, and/or runoff. One Lane Width — The width of the travel lane for a roadway. Lane width does not include shoulders, curbs, and on -street parking areas. Outfall Catchment — The land area draining to a single outfall or interconnection. The extent of an outfall's catchment is determined not only by localized topography and impervious cover but also by the location of drainage structures and the connectivity of MS4 pipes. Owner or operator - the owner or operator of any "facility or activity" subject to regulation under the NPDES program. Person - an individual, association, partnership, corporation, municipality, State or Federal agency, or an agent or employee thereof. Point source - any discernible, confined, and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill leachate collection system, vessel, or other floating craft from which pollutants are or may be discharged. This term does not include return flows from irrigated agriculture or agricultural stormwater runoff. Pollutant - dredged spoil, solid waste, incinerator residue, filter backwash, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt, and industrial, municipal and agricultural waste discharged into water. Pollutant of concern — A pollutant which causes or contributes to a violation of a water quality standard, including a pollutant which is identified as causing an impairment in a State's 303(d) list. Redevelopment — for the purposes of part 2.3.6., any construction, land alteration, or improvement of impervious surfaces resulting in total earth disturbances greater than 1 Page 4 of 8 MA MS4 General Permit Appendix A acre (or activities that are part of a larger common plan of development disturbing greater than 1 acre) that does not meet the definition of new development (see above). Reportable Quantity Release — a release of a hazardous substance at or above the established legal threshold that requires emergency notification. Refer to 40 CFR Parts 110, 177, and 302 for complete definitions and reportable quantities for which notification is required. Runoff coefficient - the fraction of total rainfall that will appear at the conveyance as runoff. Significant materials - includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic pellets; finished materials such as metallic products; raw materials used in food processing or production; hazardous substances designated under section 101(14) of CERCLA; any chemical the facility is required to report pursuant to section 313 of Title III of SARA; fertilizers; pesticides; and waste products such as ashes, slag and sludge that have the potential to be released with stormwater discharges. Site — for the purposes of part 2.3.6., the area extent of construction activities, including but not limited to the creation of new impervious cover and improvement of existing impervious cover (e.g. repaving not covered by 2.3.6.a.ii.4.d.) Small Municipal Separate Storm Sewer System — all separate storm sewer systems that are (i) owned or operated by the United States, a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under State law such as a sewer district, flood control district, or drainage district, or similar entity or an Indian tribe or an authorized Indian tribal organization or a designated and approved management agency under section 208 of the CWA that discharges to waters of the United States, and (ii) not defined as "large" or "medium" municipal separate storm sewer system pursuant to paragraphs 40 CFR 122.26 (b)(4) and (b)(7), or designated under paragraph 40 126.26(a) (1)(v). This term includes systems similar to separate storm sewer systems in municipalities, such as systems at military bases, large hospital or prison complexes, and highways and other thoroughfares. This term does not include separate storm sewers in very discrete areas, such as individual buildings. Small MS4 — means a small municipal separate storm sewer system. Stormwater - stormwater runoff, snow melt runoff, and surface runoff and drainage. Stormwater Discharges Associated with Construction Activity - a discharge of pollutants in stormwater runoff from areas where soil disturbing activities (e.g., clearing, grading, or excavating), construction materials, or equipment storage or maintenance (e.g., fill piles, borrow areas, concrete truck washout, fueling), or other industrial Page 5 of 8 MA MS4 General Permit Appendix A stormwater directly related to the construction process (e.g., concrete or asphalt batch plants) are located. (See 40 CFR 122.26(b)(14)(x) and 40 CFR 122.26(b)(15). Stormwater Discharges Associated with Industrial Activity - the discharge from any conveyance that is used for collecting and conveying stormwater and that is directly related to manufacturing, processing or raw materials storage areas at an industrial plant. The term does not include discharges from facilities or activities excluded from the NPDES program under Part 122. For the categories of industries identified in this section, the term includes, but is not limited to, stormwater discharges from industrial plant yards; immediate access roads and rail lines used or traveled by carriers of raw materials, manufactured products, waste material, or by-products used or created by the facility; material handling sites; refuse sites; sites used for the application or disposal of process waste waters (as defined at part 401 of this chapter); sites used for the storage and maintenance of material handling equipment; sites used for residual treatment, storage, or disposal; shipping and receiving areas; manufacturing buildings; storage areas (including tank farms) for raw materials, and intermediate and final products; and areas where industrial activity has taken place in the past and significant materials remain and are exposed to stormwater. For the purposes of this paragraph, material handling activities include storage, loading and unloading, transportation, or conveyance of any raw material, intermediate product, final product, by-product or waste product. The term excludes areas located on plant lands separate from the plant's industrial activities, such as office buildings and accompanying parking lots as long as the drainage from the excluded areas is not mixed with stormwater drained from the above described areas. Industrial facilities include those that are federally, State, or municipally owned or operated that meet the description of the facilities listed in Appendix D of this permit. The term also includes those facilities designated under the provisions of 40 CFR 122.26(a)(1)(v). Total Maximum Daily Loads (TMDLs) - A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL includes wasteload allocations (WLAs) for point source discharges, load allocations (LAs) for nonpoint sources and/or natural background, and must include a margin of safety (MOS) and account for seasonal variations. (See section 303(d) of the Clean Water Act and 40 CFR 130.2 and 130.7). Urbanized Area — US Census designated area comprised of a densely settled core of census tracts and/or census blocks that meet minimum population density requirements, along with adjacent territory containing non-residential urban land uses as well as territory with low population density included to link outlying densely settled territory with the densely settled core. For the purposes of this permit, Urbanized Areas as defined by any Census since 2000 remain subject to stormwater regulation even if there is a change in the reach of the Urbanized Area because of a change in more recent Census data. Page 6 of 8 MA MS4 General Permit Appendix A Water Quality Limited Water — for the purposes of this permit, a water quality limited water is any waterbody that does not meet applicable water quality standards, including but not limited to waters listed in categories 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act section 303(d) and 305(b). Water Quality Standards - A water quality standard defines the water quality goals of a water body, or portion thereof, by designating the use or uses to be made of the water and by setting criteria necessary to protect the uses. States and EPA adopt WQS to protect public health or welfare, enhance the quality of water and serve the purposes of the Clean Water Act (See CWA sections 101(a)2 and 303(c)). ABBREVIATIONS AND ACRONYMS BMP — Best Management Practice BPJ — Best Professional Judgment CGP — Construction General Permit CWA — Clean Water Act (or the Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq) DCIA — Directly Connected Impervious Area EPA — U. S. Environmental Protection Agency ESA — Endangered Species Act USFWS — U. S. Fish and Wildlife Service IA — Impervious Area IDDE — Illicit Discharge Detection and Elimination LA — Load Allocations MOS — Margin of Safety MS4 — Municipal Separate Storm Sewer System MSGP — Multi -Sector General Permit NHPA — National Historic Preservation Act NMFS — U. S. National Marine Fisheries Service NOI — Notice of Intent NPDES — National Pollutant Discharge Elimination System NRHP — National Register of Historic Places NSPS — New Source Performance Standard NTU — Nephelometric Turbidity Unit PCP — Phosphorus Control Plan (pertaining to Charles River Watershed phosphorus TMDL requirements only — Appendix F Part A.I) LPCP — Lake Phosphorus Control Plan (pertaining to Lake or pond phosphorus TMDL requirements only — Appendix F Part A.II) POTW — Publicly Owned Treatment Works RCRA — Resource Conservation and Recovery Act SHPO — State Historic Preservation Officer SIC — Standard Industrial Classification SPCC — Spill Prevention, Control, and Countermeasure SWMP — Stormwater Management Program SWPPP — Stormwater Pollution Prevention Plan TMDL — Total Maximum Daily Load TSS — Total Suspended Solids Page 7 of 8 MA MS4 General Permit Appendix A USGS — United States Geological Survey WLA — Wasteload Allocation WQS — Water Quality Standard Page 8 of 8 MA MS4 General Permit Appendix B Appendix B Standard Permit Conditions Standard Permit Conditions Standard permit conditions in Appendix B are consistent with the general permit provisions required under 40 CFR 122.41. B.1. Duty To Comply You must comply with all conditions of this permit. Any permit noncompliance constitutes a violation of the Clean Water Act and is grounds for enforcement action; for permit termination, revocation and reissuance, or modification; or for denial of a permit renewal application. A. You must comply with effluent standards or prohibitions established under section 307(a) of the Clean Water Act for toxic pollutants and with standards for sewage sludge use or disposal established under section 405(d) of the CWA within the time provided in the regulations that establish these standards or prohibitions or standards for sewage sludge use or disposal, even if the permit has not yet been modified to incorporate the requirement. B. Penalties for Violations of Permit Conditions: The Director will adjust the civil and administrative penalties listed below in accordance with the Civil Monetary Penalty Inflation Adjustment Rule (61 FR 252, December 31, 1996, pp. 69359- 69366, as corrected in 62 FR 54, March 20, 1997, pp.13514-13517) as mandated by the Debt Collection Improvement Act of 1996 for inflation on a periodic basis. This rule allows EPA's penalties to keep pace with inflation. The Agency is required to review its penalties at least once every 4 years thereafter and to adjust them as necessary for inflation according to a specified formula. The civil and administrative penalties following were adjusted for inflation starting in 1996. 1. Criminal Penalties. a. Negligent Violations. The CWA provides that any person who negligently violates permit conditions implementing Sections 301, 302, 306, 307, 308, 318, or 405 of the Act is subject to criminal penalties of $2,500 to $25,000 per day of violation, or imprisonment of not more than one year, or both. In the case of a second or subsequent conviction for a negligent violation, a person shall be subject to criminal penalties of not more than $50,000 per day of violation or by imprisonment of not more than two years, or both. b. Knowing Violations. The CWA provides that any person who knowingly violates permit conditions implementing Sections 301, 302, 306, 307, 308, 318, or 405 of the Act is subject to a fine of not less than $5,000 nor more than $50,000 per day of violation, or by imprisonment for not more than 3 years, or both. In the case of a Page 1 of 10 MA MS4 General Permit Appendix B second or subsequent conviction for a knowing violation, a person shall be subject to criminal penalties of not more than $100,000 per day of violation, or imprisonment of not more than 6 years, or both. Knowing Endangerment. The CWA provides that any person who knowingly violates permit conditions implementing Sections 301, 302, 306, 307, 308, 318, or 405 of the Act and who knows at that time that he or she is placing another person in imminent danger of death or serious bodily injury shall upon conviction be subject to a fine of not more than $250,000 or by imprisonment of not more than 15 years, or both. In the case of a second or subsequent conviction for a knowing endangerment violation, a person shall be subject to a fine of not more than $500,000 or by imprisonment of not more than 30 years, or both. An organization, as defined in section 309(c)(3)(B)(iii) of the Act, shall, upon conviction of violating the imminent danger provision be subject to a fine of not more than $1,000,000 and can fined up to $2,000,000 for second or subsequent convictions. d. False Statement. The CWA provides that any person who falsifies, tampers with, or knowingly renders inaccurate any monitoring device or method required to be maintained under this permit shall, upon conviction, be punished by a fine of not more than $10,000, or by imprisonment for not more than 2 years, or both. If a conviction of a person is for a violation committed after a first conviction of such person under this paragraph, punishment is a fine of not more than $20,000 per day of violation, or by imprisonment of not more than 4 years, or both. The Act further provides that any person who knowingly makes any false statement, representation, or certification in any record or other document submitted or required to be maintained under this permit, including monitoring reports or reports of compliance or non-compliance shall, upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more than 6 months per violation, or by both. 2. Civil Penalties. The CWA provides that any person who violates a permit condition implementing Sections 301, 302, 306, 307, 308, 318, or 405 of the Act is subject to a civil penalty not to exceed the maximum amounts authorized by Section 309(d) of the Act and the Federal Civil Penalties Inflation Adjustment Act (28 U.S.C. § 2461 note) as amended by the Debt Collection Improvement Act (31 U.S.C. § 3701 note) (currently $32,500 per day for each violation). 3. Administrative Penalties. The CWA provides that any person who violates a permit condition implementing Sections 301, 302, 306, 307, 308, 318, or 405 of the Act is subject to an administrative penalty, as follows: Page 2 of 10 MA MS4 General Permit Appendix B 3.1. Class I Penalty. Not to exceed the maximum amounts authorized by Section 309(g)(2)(A) of the Act and the Federal Civil Penalties Inflation Adjustment Act (28 U.S.C. § 2461 note) as amended by the Debt Collection Improvement Act (31 U.S.C. § 3701 note) (currently $11,000 per violation, with the maximum amount of any Class I penalty assessed not to exceed $32,500). 3.2. Class II Penalty. Not to exceed the maximum amounts authorized by Section 309(g)(2)(B) of the Act and the Federal Civil Penalties Inflation Adjustment Act (28 U.S.C. § 2461 note) as amended by the Debt Collection Improvement Act (31 U.S.C. § 3701 note) (currently $11,000 per day for each day during which the violation continues, with the maximum amount of any Class II penalty not to exceed $157,500). B.2. Duty to Reapply If you wish to continue an activity regulated by this permit after the expiration date of this permit, you must apply for and obtain a new permit. B.3. Need to Halt or Reduce Activity Not a Defense It shall not be a defense for you in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit. BA. Duty to Mitigate You must take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in violation of this permit which has a reasonable likelihood of adversely affecting human health or the environment. B.S. Proper Operation and Maintenance You must at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances) which are installed or used by you to achieve compliance with the conditions of this permit, including the requirements of your SWPPP. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality assurance procedures. This provision requires the operation of backup or auxiliary facilities or similar systems which are installed by you only when the operation is necessary to achieve compliance with the conditions of this permit. B.6. Permit Actions This permit may be modified, revoked and reissued, or terminated for cause. Your filing of a request for a permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not stay any permit condition. Page 3 of 10 MA MS4 General Permit Appendix B B.7. Property Rights This permit does not convey any property rights of any sort, or any exclusive privileges. B.8. Duty to Provide Information You must furnish to EPA or an authorized representative (including an authorized contractor acting as a representative of EPA), within a reasonable time, any information which EPA may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this permit or to determine compliance with this permit. You must also furnish to EPA upon request, copies of records required to be kept by this permit. B.9. Inspection and Entry You must allow EPA or an authorized representative (including an authorized contractor acting as a representative of EPA), upon presentation of credentials and other documents as may be required by law, to: A. Enter upon your premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this permit; B. Have access to and copy, at reasonable times, any records that must be kept under the conditions of this permit; C. Inspect at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this permit; and D. Sample or monitor at reasonable times, for the purposes of assuring permit compliance or as otherwise authorized by the Clean Water Act, any substances or parameters at any location. B.10. Monitoring and Records A. Samples and measurements taken for the purpose of monitoring must be representative of the volume and nature of the monitored activity. B. You must retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, copies of all reports required by this permit, and records of all data used to complete the application for this permit, for a period of at least three years from the date of the sample, measurement, report or application. This period may be extended by request of EPA at any time. C. Records of monitoring information must include: l . The date, exact place, and time of sampling or measurements; 2. The individual(s) who performed the sampling or measurements; 3. The date(s) analyses were performed Page 4 of 10 MA MS4 General Permit Appendix B 4. The individual(s) who performed the analyses; 5. The analytical techniques or methods used; and 6. The results of such analyses. D. Monitoring results must be conducted according to test procedures approved under 40 CFR Part 136 or, in the case of sludge use or disposal, approved under 40 CFR Part 136 unless otherwise specified in 40 CFR Part 503, unless other test procedures have been specified in the permit. E. The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders inaccurate any monitoring device or method required to be maintained under this permit shall, upon conviction, be punished by a fine of not more than $10,000, or by imprisonment for not more than 2 years, or both. If a conviction of a person is for a violation committed after a first conviction of such person under this paragraph, punishment is a fine of not more than $20,000 per day of violation, or by imprisonment of not more than 4 years, or both. B.11. Signatory Requirements A. All applications, including NOIs, must be signed as follows: For a corporation: By a responsible corporate officer. For the purpose of this subsection, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy- or decision -making functions for the corporation, or (ii) the manager of one or more manufacturing, production, or operating facilities, provided, the manager is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term environmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures. 2. For a partnership or sole proprietorship: By a general partner or the proprietor, respectively; or 3. For a municipality, state, federal, or other public agency: By either a principal executive officer or ranking elected official. For purposes of this subsection, a principal executive officer of a federal agency includes (i) the chief executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., Regional Administrator of EPA). Page 5 of 10 MA MS4 General Permit Appendix B B. All reports, including SWPPPs, inspection reports, annual reports, monitoring reports, reports on training and other information required by this permit must be signed by a person described in Appendix B, Subsection 11.A above or by a duly authorized representative of that person. A person is a duly authorized representative only if- 1. The authorization is made in writing by a person described in Appendix B, Subsection 1 I.A; 2. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and 3. The signed and dated written authorization is included in the SWPPP. A copy must be submitted to EPA, if requested. C. Changes to Authorization. If an authorization under Appendix B, Subsection 11.13 is no longer accurate because a different operator has responsibility for the overall operation of the industrial facility, a new NOI satisfying the requirements of Subsection 11.B must be submitted to EPA prior to or together with any reports, information, or applications to be signed by an authorized representative. D. Any person signing documents required under the terms of this permit must include the following certification: "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." E. The CWA provides that any person who knowingly makes any false statement, representation, or certification in any record or other document submitted or required to be maintained under this permit, including monitoring reports or reports of compliance or non-compliance shall, upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more than 6 months per violation, or by both. Page 6 of 10 MA MS4 General Permit Appendix B B.12. Reporting Requirements A. Planned changes. You must give notice to EPA as soon as possible of any planned physical alterations or additions to the permitted facility. Notice is required only when: 1. The alteration or addition to a permitted facility may meet one of the criteria for determining whether a facility is a new source in 40 CFR § 122.29(b); or 2. The alteration or addition could significantly change the nature or increase the quantity of pollutants discharged. This notification applies to pollutants which are subject neither to effluent limitations in the permit, nor to notification requirements under 40 CFR § 122.42(a)(1). B. Anticipated noncompliance. You must give advance notice to EPA of any planned changes in the permitted facility or activity which may result in noncompliance with permit requirements. C. Transfers. This permit is not transferable to any person except after notice to EPA. EPA may require modification or revocation and reissuance of the permit to change the name of the permittee and incorporate such other requirements as may be necessary under the Clean Water Act. (See 40 CFR § 122.61; in some cases, modification or revocation and reissuance is mandatory.) D. Monitoring reports. Monitoring results must be reported at the intervals specified elsewhere in this permit. 1. Monitoring results must be reported on a Discharge Monitoring Report (DMR) or forms (paper or electronic) provided or specified by EPA for reporting results of monitoring of sludge use or disposal practices. 2. If you monitor any pollutant more frequently than required by the permit using test procedures approved under 40 CFR Part 136 or, in the case of sludge use or disposal, approved under 40 CFR Part 136 unless otherwise specified in 40 CFR Part 503, or as specified in the permit, the results of this monitoring must be included in the calculation and reporting of the data submitted in the DMR or sludge reporting form specified by EPA. 3. Calculations for all limitations which require averaging of measurements must use an arithmetic mean and non -detected results must be incorporated in calculations as the limit of quantitation for the analysis. E. Compliance schedules. Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule of this permit must be submitted no later than 14 days following each schedule date. F. Twenty-four hour reporting. 1. You must report any noncompliance which may endanger health or the environment. Any information must be provided orally within 24 hours Page 7 of 10 MA MS4 General Permit Appendix B from the time you become aware of the circumstances. A written submission must also be provided within five days of the time you become aware of the circumstances. The written submission must contain a description of the noncompliance and its cause; the period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. 2. The following shall be included as information which must be reported within 24 hours under this paragraph. a. Any unanticipated bypass which exceeds any effluent limitation in the permit. (See 40 CFR § 122.41(g).) b. Any upset which exceeds any effluent limitation in the permit Violation of a maximum daily discharge limitation for any of the pollutants listed by EPA in the permit to be reported within 24 hours. (See 40 CFR § 122.44(g).) 3. EPA may waive the written report on a case -by -case basis for reports under Appendix B, Subsection 12.F.2 if the oral report has been received within 24 hours. G. Other noncompliance. You must report all instances of noncompliance not reported under Appendix B, Subsections 12.1), 12.E, and 121, at the time monitoring reports are submitted. The reports must contain the information listed in Appendix B, Subsection 12.F. H. Other information. Where you become aware that you failed to submit any relevant facts in a permit application, or submitted incorrect information in a permit application or in any report to the Permitting Authority, you must promptly submit such facts or information. B.13. Bypass A. Definitions. 1. Bypass means the intentional diversion of waste streams from any portion of a treatment facility 2. Severe property damage means substantial physical damage to property, damage to the treatment facilities which causes them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production. B. Bypass not exceeding limitations. You may allow any bypass to occur which does not cause effluent limitations to be exceeded, but only if it also is for essential Page 8 of 10 MA MS4 General Permit Appendix B maintenance to assure efficient operation. These bypasses are not subject to the provisions of Appendix B, Subsections 13.0 and 13.D. C. Notice. 1. Anticipated bypass. If you know in advance of the need for a bypass, you must submit prior notice, if possible at least ten days before the date of the bypass. 2. Unanticipated bypass. You must submit notice of an unanticipated bypass as required in Appendix B, Subsection 12.F (24-hour notice). D. Prohibition of bypass. Bypass is prohibited, and EPA may take enforcement action against you for bypass, unless: a. Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage; b. There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, or maintenance during normal periods of equipment downtime. This condition is not satisfied if adequate back-up equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass which occurred during normal periods of equipment downtime or preventive maintenance; and C. You submitted notices as required under Appendix B, Subsection O.C. 2. EPA may approve an anticipated bypass, after considering its adverse effects, if EPA determines that it will meet the three conditions listed above in Appendix B, Subsection 13.D.1. B.14. Upset A. Definition. Upset means an exceptional incident in which there is unintentional and temporary noncompliance with technology based permit effluent limitations because of factors beyond your reasonable control. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. B. Effect of an upset. An upset constitutes an affirmative defense to an action brought for noncompliance with such technology based permit effluent limitations if the requirements of Appendix B, Subsection 14.0 are met. No determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is final administrative action subject to judicial review. Page 9 of 10 MA MS4 General Permit Appendix B C. Conditions necessary for a demonstration of upset. A permittee who wishes to establish the affirmative defense of upset must demonstrate, through properly signed, contemporaneous operating logs, or other relevant evidence that: An upset occurred and that you can identify the cause(s) of the upset; 2. The permitted facility was at the time being properly operated; and 3. You submitted notice of the upset as required in Appendix B, Subsection 12.F.2.b (24 hour notice). 4. You complied with any remedial measures required under Appendix B, Subsection 4. D. Burden of proof. In any enforcement proceeding, you, as the one seeking to establish the occurrence of an upset, has the burden of proof. Page 10 of 10 MA MS4 General Permit Appendix C APPENDIX C ENDANGERED SPECIES GUIDANCE A. Background In order to meet its obligations under the Clean Water Act and the Endangered Species Act (ESA), and to promote the goals of those Acts, the Environmental Protection Agency (EPA) is seeking to ensure the activities regulated by this general permit do not adversely affect endangered and threatened species or critical habitat. Applicants applying for permit coverage must assess the impacts of their stormwater discharges and discharge -related activities on federally listed endangered and threatened species ("listed species") and designated critical habitat ("critical habitat") to ensure that those goals are met. Prior to obtaining general permit coverage, applicants must meet the ESA eligibility provisions of this permit by following the steps in this Appendix'. Applicants also have an independent ESA obligation to ensure that their activities do not result in any prohibited "take" of listed species12. The term "Take" is used in the ESA to include harass, harm, pursue, hunt, shoot, wound, kill, trap, capture, collect, or attempt to engage in any such conduct. "Harm" is further defined to include significant habitat modification or degradation that results in death or injury to listed species by significantly impairing essential behavioral patterns including breeding, feeding, or sheltering. "Harass" is defined as intentional or negligent actions that create the likelihood of injury to listed species to such an extent as to significantly disrupt normal behavior patterns which include, but are not limited to, breeding, feeding, or sheltering. Many of the measures required in this general permit and in these instructions to protect species may also assist in ensuring that the applicant's activities do not result in a prohibited take of species in violation of section 9 of the ESA. If the applicant has plans or activities in an area where endangered and threatened species are located, they may wish to ensure that they are protected from potential take liability under ESA section 9 by obtaining an ESA section 10 permit or by requesting formal consultation under ESA section 7. Applicants that are unsure whether to pursue a section 10 permit or a section 7 consultation for takings protection should confer with the appropriate United States Fish and Wildlife Service (USFWS) office or the National Marine Fisheries Service (NMFS), (jointly the Services). Currently, there are 20 species of concern for applicants applying for permit coverage, namely the Dwarf wedgemussel (Alasmidonta heterodon), Northeastern bulrush (Scirpus ancistrochaetus), Sandplain gerardia (Agalinis acuta), Piping Plover (Charadrius melodus), Roseate Tern (Sterna dougalld), Northern Red -bellied cooter (Pseudemys rubriventis), Bog Turtle (Glyptemys muhlenbergii), Small whorled Pogonia (Isotria medeoloides), Puritan tiger beetle (Cicindela puritana), American burying beetle (Nicrophorus americanus), Northeastern beach tiger beetle (Cicindela dorsalis), Northern Long-eared Bat (Myotis septentriolis)Atlantic Sturgeon (Acipenser oxyrinchus), Shortnose Sturgeon (Acipenser brevirostrum), North Atlantic Right Whale (Eubalaena glacialis) Humpback Whale (Megaptera novaengliae), Fin Whale (Balaenoptera physalus), Kemp's Ridley Sea Turtle (Lepidochelys kempii), Loggerhead Sea Turtle (Caretta caretta), Leatherback Sea Turtle (Dermochelys coriacea), and the Green Turtle (Chelonia 1 EPA strongly encourages applicants to begin this process at the earliest possible stage to ensure the notification requirements for general permit coverage are complete upon Notice of Intent (NOI) submission. 2 Section 9 of the ESA prohibits any person from "taking" a listed species (e.g. harassing or harming it) unless: (1) the taking is authorized through an "incidental take statement" as part of completion of formal consultation according to ESA section 7; (2) where an incidental take permit is obtained under ESA section 10 (which requires the development of a habitat conversion plan; or (3) where otherwise authorized or exempted under the ESA. This prohibition applies to all entities including private individuals, businesses, and governments. Page 1 of 7 MA MS4 General Permit Appendix C mydas). The Atlantic Sturgeon, Shortnose Sturgeon, North Atlantic Right Whale, Humpback Whale, Fin Whale, Loggerhead Sea Turtle, Kemp's Ridley Sea Turtle, Leatherback Sea Turtle and Green Turtle are listed under the jurisdiction of NMFS. The Dwarf wedgemussel, Northeastern bulrush, Sandplain gerardia, Piping Plover, Northern Red -bellied cooter, Bog Turtle, Small whorled Pogonia, Roseate Tern, Puritan tiger beetle, Northeastern beach tiger beetle, Northern Long-eared Bat and American burying beetle are listed under the jurisdiction of the U.S. Fish and Wildlife Service. Any applicant seeking coverage under this general permit, must consult with the Services where appropriate. When listed species are present, permit coverage is only available if EPA determines, or the applicant determines and EPA concurs, that the discharge or discharge related activities will have "no affect" on the listed species or critical habitat, or the applicant or EPA determines that the discharge or discharge related activities are "not likely to adversely affect" listed species or critical habitat and formal or informal consultation with the Services has been concluded and results in written concurrence by the Services that the discharge is "not likely to adversely affect" an endangered or threatened species or critical habitat. EPA may designate the applicants as non -Federal representatives for the general permit for the purpose of carrying out formal or informal consultation with the Services (See 50 CFR §402.08 and §402.13). By terms of this permit, EPA has automatically designated operators as non - Federal representatives for the purpose of conducting formal or informal consultation with the U.S. Fish and Wildlife Service. EPA has not designated operators as non -Federal representatives for the purpose of conducting formal or informal consultation with the National Marine Fisheries Service. EPA has determined that discharges from MS4s are not likely to adversely affect listed species or critical habitat under the jurisdiction of the National Marine Fisheries Service. EPA has initiated informal consultation with the National Marine Fisheries Service on behalf of all permittees and no further action is required by permittees in order to fulfill ESA requirements of this permit related to species under the jurisdiction of NMFS B. The U.S. Fish and Wildlife Service ESA Eligibility Process Before submitting a notice of intent (NOI) for coverage by this permit, applicants must determine whether they meet the ESA eligibility criteria by following the steps in Section B of this Appendix. Applicants that cannot meet the eligibility criteria in Section B must apply for an individual permit. The USFWS ESA eligibility requirements of this permit relating to the Dwarf wedgemussel, Northeastern bulrush, Sandplain gerardia, Piping Plover, Northern Red -bellied cooter, Bog Turtle, Small whorled Pogonia, Roseate Tern, Puritan tiger beetle, Northeastern beach tiger beetle, Northern Long-eared Bat and American burying beetle may be satisfied by documenting that one of the following criteria has been met: USFWS Criterion A: No endangered or threatened species or critical habitat are in proximity to the stormwater discharges or discharge related activities. USFWS Criterion B: In the course of formal or informal consultation with the Fish and Wildlife Service, under section 7 of the ESA, the consultation resulted in either a no jeopardy opinion (formal consultation) or a written concurrence by USFWS on a finding that the stormwater discharges and Page 2 of 7 MA MS4 General Permit Appendix C discharge related activities are "not likely to adversely affect" listed species or critical habitat (informal consultation). USFWS Criterion C: Using the best scientific and commercial data available, the effect of the stormwater discharge and discharge related activities on listed species and critical habitat have been evaluated. Based on those evaluations, a determination is made by EPA, or by the applicant and affirmed by EPA, that the stormwater discharges and discharge related activities will have "no affect" on any federally threatened or endangered listed species or designated critical habitat under the jurisdiction of the USFWS. The Steps to Determine if the USFWS ESA Eligibility Criteria Can Be Met To determine eligibility, you must assess the potential effects of your known stormwater discharges and discharge related activities on listed species or critical habitat, PRIOR to completing and submitting a Notice of Intent (NOI). You must follow the steps outlined below and document the results of your eligibility determination. Step 1— Determine if you can meet USFWS Criterion A USFWS Criterion A: You can certify eligibility, according to USFWS Criterion A, for coverage by this permit if, upon completing the Information, Planning, and Conservation (IPaQ online system process, you printed and saved the preliminary determination which indicated that federally listed species or designated critical habitats are not present in the action area. See Attachment 1 to Appendix C for instructions on how to use IPaC. If you have met USFWS Criterion A skip to Step # 4. If you have not met USFWS Criterion A, go to Step # 2. Step 2 — Determine if You Can Meet Eligibility USFWS Criteria B USFWS Criterion B: You can certify eligibility according to USFWS Criteria B for coverage by this permit if you answer "Yes" to all of the following questions: 1) Does your action area contain one or more of the following species: Sandplain gerardia, Small whorled Pogonia, American burying beetle, Dwarf wedgemussel, Northeastern bulrush, Piping Plover, Northern Red -bellied cooter, Bog Turtle, Roseate Tern, Puritan tiger beetle, and Northeastern beach tiger beetle? AND 2) Did your assessment of the discharge and discharge related activities indicate that the discharge or discharge related activities "may affect" or are "not likely to adversely affect" listed species or critical habitat? AND 3) Did you contact the USFWS and did the formal or informal consultation result in either a "no jeopardy" opinion by the USFWS (for formal consultation) or concurrence by the Page 3 of 7 MA MS4 General Permit Appendix C USFWS that your activities would be "not likely to adversely affect' listed species or critical habitat (for informal consultation)? AND 4) Do you agree to implement all measures upon which the consultation was conditioned? 5) Do you agree that if, during the course of the permit term, you plan to install a structural BMP not identified in the NOI that you will re -initiate informal or formal consultation with USFWS as necessary? Use the guidance below Step 3 to understand effects determination and to answer these questions. If you answered "Yes " to all four questions above, you have met eligibility USFWS Criteria B. Skip to Step 4. If you answered "No " to any of the four questions above, go to Step 3. Step 3 — Determine if You Can Meet Eligibility USFWS Criterion C USFWS Criterion C: You can certify eligibility according to USFWS Criterion C for coverage by this permit if you answer "Yes" to both of the following question: 1) Does your action area contain one or more of the following species: Northern Long- eared Bat, Sandplain gerardia, Small whorled Pogonia and/or American burying beetle and does not contain one any following species: Dwarf wedgemussel, Northeastern bulrush, Piping Plover, Northern Red -bellied cooter, Bog Turtle, Roseate Tern, Puritan tiger beetle, and Northeastern beach tiger beetle?' OR 2) Did the assessment of your discharge and discharge related activities and indicate that there would be "no affect' on listed species or critical habitat and EPA provided concurrence with your determination? 3) Do you agree that if, during the course of the permit term, you plan to install a structural BMP not identified in the NOI that you will to conduct an endangered species screening for the proposed site and contact the USFWS if you determine that the new activity "may affect' or is "not likely to adversely affect' listed species or critical habitat under the jurisdiction of the USFWS. Use the guidance below to understand effects determination and to answer these questions. If you answered "Yes " to both the question above, you have met eligibility USFWS Criterion C. Go to Step 4. If you answered "No " to either of the questions above, you are not eligible for coverage by this permit. You must submit an application for an individual permit for your stormwater discharges. (See 40 CFR 122.21). USFWS Effects Determination Guidance: Page 4 of 7 MA MS4 General Permit Appendix C If you are unable to certify eligibility under USFWS Criterion A, you must assess whether your stormwater discharges and discharge -related activities "may affect", will have "no affect" or are "not likely to adversely affect" listed species or critical habitat. "Discharge -related activities" include: activities which cause, contribute to, or result in point source stormwater pollutant discharges; and measures to provide treatment for stormwater discharges including the siting, construction and operational procedures to control, reduce or prevent water pollution. Please be aware that no protection from incidental take liability is provided under this criterion. The scope of effects to consider will vary with each system. If you are having difficulty in determining whether your system is likely to cause adverse effects to a listed species or critical habitat, you should contact the USFWS for assistance. hi order to complete the determination of effects it may be necessary to follow the formal or informal consultation procedures in section 7 of the ESA. Upon completion of your assessment, document the results of your effects determination. If your results indicate that stormwater discharges or discharge related activities will have "no affect" on threatened or endangered species or critical habitat and EPA concurs with your determination, you are eligible under USFWS Criterion C of this Appendix. Your determination may be based on measures that you implement to avoid, eliminate, or minimized adverse effects. If the determination is `May affect" or "not likely to adversely affect" you must contact the USFWS to discuss your findings and measures you could implement to avoid, eliminate, or minimize adverse effects. If you and the USFWS reach agreement on measures to avoid adverse effects, you are eligible under USFWS Criterion B. Any terms and/or conditions to protect listed species and critical habitat that you relied on in order to complete an adverse effects determination, must be incorporated into your Storm Water Management Program (required by this permit) and implemented in order to maintain permit eligibility. If endangered species issues cannot be resolved: If you cannot reach agreement with the USFWS on measures to avoid or eliminate adverse effects then you are not eligible for coverage under this permit. You must seek coverage under an individual permit. Effects from stormwater discharges and discharge -related activities which could pose an adverse effect include: Hydrological: Stormwater discharges may cause siltation, sedimentation, or induce other changes in receiving waters such as temperature, salinity or pH. These effects will vary with the amount of stormwater discharged and the volume and condition of the receiving water. Where a discharge constitutes a minute portion of the total volume of the receiving water, adverse hydrological effects are less likely. Habitat: Excavation, site development, grading and other surface disturbance activities, including the installation or placement of treatment equipment may adversely affect listed species or their habitat. Stormwater from the small MS4 may inundate a listed species habitat. Page 5 of 7 MA MS4 General Permit Appendix C • Toxicity: In some cases, pollutants in the stormwater may have toxic effects on listed species. Step 4 - Document Results of the Eligibility Determination Once the USFWS ESA eligibility requirements have been met, you shall include documentation of USFWS ESA eligibility in the Storm Water Management Program required by the permit. Documentation for the various eligibility criteria are as follows: USFWS Criterion A: A copy of the IPaC generated preliminary determination letter indicating that no listed species or critical habitat is present within your action area. You shall also include a statement on how you determined that no listed species or critical habitat are in proximity to your stormwater system or discharges. USFWS Criterion B: A dated copy of the USFWS letter of concurrence on a finding of "no jeopardy" (for formal consultation) or "not likely to adversely affect" (for informal consultation) regarding the ESA section 7 consultation. USFWS Criterion C: A dated copy of the EPA concurrence with the operator's determination that the stormwater discharges and discharge -related activities will have "no affect" on listed species or critical habitat. C. Submittal of Notice of Intent Once the ESA eligibility requirements of Part C of this Appendix have been metyoumay submit the Notice of Intent indicating which Criterion you have met to be eligible for permit coverage. Signature and submittal of the NOI constitutes your certification, under penalty of law, of eligibility for permit coverage under 40 CFR 122.21. D. Duty to Implement Terms and Conditions upon which Eligibility was Determined You must comply with any terms and conditions imposed under the ESA eligibility requirements to ensure that your stormwater discharges and discharge related activities do not pose adverse effects or jeopardy to listed species and/or critical habitat. You must incorporate such terms and conditions into your Storm Water Management Program as required by this permit. If the ESA eligibility requirements of this permit cannot be met, then you may not receive coverage under this permit and must apply for an individual permit. E. Services Information United States Fish and Wildlife Service Office National websites for Endangered Species Information: Endangered Species home page: http://endangered.fws.gov ESA Section 7 Consultations: http://endangered.fws.gov/consultation/index.html Information, Planning, and Conservation System (IPAC): http://ecos.fws.gov/ipac/ U.S. FWS — Region 5 Supervisor Page 6 of 7 MA MS4 General Permit Appendix C New England Field Office U.S. Fish and Wildlife Services 70 Commercial Street, Suite 300 Concord, NH 03301 Natural Heritage Network The Natural Heritage Network comprises 75 independent heritage program organizations located in all 50 states, 10 Canadian provinces, and 12 countries and territories located throughout Latin America and the Caribbean. These programs gather, manage, and distribute detailed information about the biological diversity found within their jurisdictions. Developers, businesses, and public agencies use natural heritage information to comply with environmental laws and to improve the environmental sensitivity of economic development projects. Local governments use the information to aid in land use planning. The Natural Heritage Network is overseen by NatureServe, the Network's parent organization, and is accessible on-line at: http://www.natureserve.org/nhp/us programs.htm, which provides websites and other access to a large number of specific biodiversity centers. Page 7 of 7 MA MS4 General Permit Attachment 1 Appendix C U.S. Fish and Wildlife IPaC system instructions Use the following protocol to determine if any federally listed species or designated critical habitats under USFWS jurisdiction exist in your action area: Enter your project specific information into the "Initial Project Scoping" feature of the Information, Planning, and Conservation (IPaQ system mapping tool, which can be found at the following location: hitp:Hecos.fws.gov/ipac/ a. Indicate the action areal for the MS4 by either: a. Drawing the boundary on the map or by uploading a shapefile. Select "Continue" Click on the "SEE RESOURCE LIST" button and on the next screen you can export a trust resources list.This will provided a list of natural resources of concern, which will include an Endangered Species Act Species list. You may also request an official species list under "REGULATORY DOCUMENTS" Save copies and retain for your records 1 The action area is defined by regulation as all areas to be affected directly or indirectly by the action and not merely the immediate area involved in the action (50 CFR §402.02). This analysis is not limited to the "footprint" of the action nor is it limited by the Federal agency's authority. Rather, it is a biological determination of the reach of the proposed action on listed species. Subsequent analyses of the environmental baseline, effects of the action, and levels of incidental take are based upon the action area. The documentation used by a Federal action agency to initiate consultation should contain a description of the action area as defined in the Services' regulations and explained in the Services' consultation handbook. If the Services determine that the action area as defined by the action agency is incorrect, the Services should discuss their rationale with the agency or applicant, as appropriate. Reaching agreement on the description of the action area is desirable but ultimately the Services can only consult when an action area is defined properly under the regulations. For storm water discharges or discharge related activities, the action area should encompass the following: • The immediate vicinity of, or nearby, the point of discharge into receiving waters. • The path or immediate area through which or over which storm water flows from the municipality to the point of discharge into the receiving water. This includes areas in the receiving water downstream from the point of discharge. • Areas that may be impacted by construction or repair activities. This extends as far as effects related to noise (from construction equipment, power tools, etc.) and light (if work is performed at night) may reach. The action area will vary with the size and location of the outfall pipe, the nature and quantity of the storm water discharges, and the type of receiving waters, among other factors. MA MS4 General Permit Appendix D Appendix D National Historic Preservation Act Guidance Background Section 106 of the National Historic Preservation Act (NHPA) requires federal agencies to take into account the effects of Federal "undertakings" on historic properties that are either listed on, or eligible for listing on, the National Register of Historic Places. The term federal "undertaking" is defined in the NHPA regulations to include a project, activity, or program of a federal agency including those carried out by or on behalf of a federal agency, those carried out with federal financial assistance, and those requiring a federal permit, license or approval. See 36 CFR 800.16(y). Historic properties are defined in the NHPA regulations to include prehistoric or historic districts, sites, buildings, structures, or objects that are included in, or are eligible for inclusion in, the National Register of Historic Places. This term includes artifacts, records, and remains that are related to and located within such properties. See 36 CFR 800.16(1). EPA's issuance of a National Pollutant Discharge Elimination System (NPDES) General Permit is a federal undertaking within the meaning of the NHPA regulations and EPA has determined that the activities to be carried out under the general permit require review and consideration, in order to be in compliance with the federal historic preservation laws and regulations. Although individual submissions for authorization under the general permit do not constitute separate federal undertakings, the screening processes provides an appropriate site -specific means of addressing historic property issues in connection with EPA's issuance of the permit. To address any issues relating to historic properties in connection with the issuance of this permit, EPA has included a screening process for applicants to identify whether properties listed or eligible for listing on the National Register of Historic Places are within the path of their discharges or discharge -related activities (including treatment systems or any BMPs relating to the discharge or treatment process) covered by this permit. Applicants seeking authorization under this general permit must comply with applicable, State, Tribal, and local laws concerning the protection of historic properties and places and may be required to coordinate with the State Historic Preservation Officer (SHPO) and/or Tribal Historic Preservation Officer (THPO) and others regarding effects of their discharges on historic properties. Activities with No Potential to Have an Effect on Historic Properties A determination that a federal undertaking has no potential to have an effect on historic properties fulfills an agency's obligations under NHPA. EPA has reason to believe that the vast majority of activities authorized under this general permit will have no potential effects on historic properties. This permit typically authorizes discharges from existing facilities and requires control of the pollutants discharged from the facility. EPA does not anticipate effects on historic properties from the pollutants in the authorized discharges. Thus, to the extent EPA's issuance of this general permit authorizes discharges of such constituents, confined to existing channels, outfalls or natural drainage areas, the permitting action does not have the potential to cause effects on historical properties. In addition, the overwhelming majority of sources covered under this permit will be facilities that are seeking renewal of previous permit authorization. These existing dischargers should have already addressed NHPA issues in the previous general permit as they were required to certify that they were either not affecting historic properties or they had obtained written agreement from Page 1 of 4 MA MS4 General Permit Appendix D the applicable SHPO or THPO regarding methods of mitigating potential impacts. To the extent this permit authorizes renewal of prior coverage without relevant changes in operations the discharge has no potential to have an effect on historic properties. Activities with Potential to Have an Effect on Historic Properties EPA believes this permit may have some potential to have an effect on historic properties the applicant undertakes the construction and/or installation of control measures that involve subsurface disturbance that involves less than 1 acre of land. (Ground disturbances of 1 acre or more require coverage under the Construction General Permit.) Where there is disturbance of land through the construction and/or installation of control measures, there is a possibility that artifacts, records, or remains associated with historic properties could be impacted. Therefore, if the applicant is establishing new or altering existing control measures to manage their discharge that will involve subsurface ground disturbance of less than 1 acre, they will need to ensure (1) that historic properties will not be impacted by their activities or (2) that they are in compliance with a written agreement with the SHPO, THPO, or other tribal representative that outlines all measures the applicant will carry out to mitigate or prevent any adverse effects on historic properties. Examples of Control Measures Which Involve Subsurface Disturbance The type of control measures that are presumptively expected to cause subsurface ground disturbance include: • Dikes • Berms • Catch basins, drainage inlets • Ponds, bioretention areas • Ditches, trenches, channels, swales • Culverts, pipes • Land manipulation; contouring, sloping, and grading • Perimeter Drains • Installation of manufactured treatment devices EPA cautions applicants that this list is non -inclusive. Other control measures that involve earth disturbing activities that are not on this list must also be examined for the potential to affect historic properties. Certification Upon completion of this screening process the applicant shall certify eligibility for this permit using one of the following criteria on their Notice of Intent for permit coverage: Criterion A: The discharges do not have the potential to cause effects on historic properties. Page 2 of 4 MA MS4 General Permit Appendix D Criterion B: A historic survey was conducted. The survey concluded that no historic properties are present. Discharges do not have the potential to cause effects on historic properties. Criterion C: The discharges and discharge related activities have the potential to have an effect on historic properties, and the applicant has obtained and is in compliance with a written agreement with the State Historic Preservation Officer (SHPO), Tribal Historic Preservation Officer (TPHO), or other tribal representative that outlines measures the applicant will carry out to mitigate or prevent any adverse effects on historic properties. Authorization under the general permit is available only if the applicant certifies and documents permit eligibility using one of the eligibility criteria listed above. Small MS4s that cannot meet any of the eligibility criteria in above must apply for an individual permit. Screening Process Applicants or their consultant need to answer the questions and follow the appropriate procedures below to assist EPA in compliance with 36 CFR 800. Question 1: Is the facility an existing facility authorized by the previous permit or a new facility and the applicant is not undertaking any activity involving subsurface land disturbance less than an acre? YES - The applicant should certify that fact in writing and file the statement with the EPA. This certification must be maintained as part of the records associated with the permit. The applicant should certify eligibility for this permit using Criterion A on their Notice of Intent for permit coverage. The applicant does not need to contact the state Historic Commission. Based on that statement, EPA will document that the project has "no potential to cause effects" (36 CFR 800.3(a)(1)). There are no further obligations under the Section 106 regulations. NO- Go to Question 2. Question 2: Is the property listed in the National Register of Historic Places or have prior surveys or disturbances revealed the existence of a historic property or artifacts? NO - The applicant should certify that fact in writing and file the statement with the EPA. This certification must be maintained as part of the records associated with the permit. The applicant should certify eligibility for this permit using Criterion B on their Notice of Intent for permit coverage. The applicant does not need to contact the state Historic Commission. Based on that statement, EPA will document that the project has "no potential to cause effects" (36 CFR 800.3(a)(1)). There are no further obligations under the Section 106 regulations. YES - The applicant or their consultant should prepare a complete information submittal to the SHPO. The submittal consists of - *Completed Project Notification Form- forms available at http://www.sec.state.ma.us/mhc/mhcfomi/fonnidx.htm; Page 3 of 4 MA MS4 General Permit Appendix D •USGS map section with the actual project boundaries clearly indicated; and *Scaled project plans showing existing and proposed conditions. (1) Please note that the SHPO does not accept email for review. Please mail a paper copy of your submittal (Certified Mail, Return Receipt Requested) or deliver a paper copy of your submittal (and obtain a receipt) to: State Historic Preservation Officer Massachusetts Historical Commission 220 Morrissey Blvd. Boston MA 02125. (2) Provide a copy of your submittal and the proof of MHC delivery showing the date MHC received your submittal to: NPDES Permit Branch Chief US EPA Region 1 (OEP06-1) 5 Post Office Square, Suite 100 Boston MA 02109-3912. The SHPO will comment within thirty (30) days of receipt of complete submittals, and may ask for additional information. Consultation, as appropriate, will include EPA, the SHPO and other consulting parties (which includes the applicant). The steps in the federal regulations (36 CFR 800.2 to 800.6, etc.) will proceed as necessary to conclude the Section 106 review for the undertaking. The applicant should certify eligibility for this permit using Criterion C on their Notice of Intent for permit coverage. Page 4 of 4 Notice of Intent (NOI) for coverage under Small MS4 General Permit Page # of## Part I: General Conditions General Information Name of Municipality or Organization: State EPA NPDES Permit Number: Primary MS4 Program Manager Contact Information Name: Title: Street Address Line 1 Street Address Line 2 City F State - Zip Code 12345-6789 Email: Phone Number: (123) 456-7890 Fax Number: Other Information Check the box if your municipality or organization was covered under the 2003 MS4 General Permit Stormwater Management Program (SWMP) Location (web address or physical location): Eligibility Determination Endangered Species Act (ESA) Determination Complete? Eligibility Criteria (check all that apply): ❑ A ❑ B ❑ C ❑ D ❑ E ❑ F Eligibility Criteria National Historic Preservation Act (NHPA) Determination Complete? (check all that apply): ❑ A ❑ B ❑ C ❑ D MS4 Infrastructure (if covered under the 2003 permit) Estimated Percent of Outfall Map Complete? If 100% of 2003 requirements not met, enter an (Part I1,111,IV or V, SubpartB.3.(a.) of2003 permit) _estimated date of completion (MM/DD/YY): Web address where MS4 map is published: If outfall map is unavailable on the internet on electronic or paper copy of the outfall map must be included with NOI submission (see section V for submission options) Regulatory Authorities (if covered under the 2003 permit) Illicit Discharge Detection and Elimination (IDDE) Authority Adopted?: _ Effective Date or Estimated (Part II,III,IV or V, Subpart B.3.(b.) of 2003 permit) Date of Adoption (MM/DD/YY): Construction/Erosion and Sediment Control (ESC) Authority Adopted?: _ Effective Date or Estimated (Part I1,111,IVorV, SubpartB.4.(a.) of2003 permit) Date of Adoption (MM/DD/YY): Post- Construction Stormwater Management Adopted?: _ Effective Date or Estimated (Part I1,111,IVorV, SubpartB.5.(a.) of2003 permit) Date of Adoption (MM/DD/YY): Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part II: Summary of Receivina Waters Please list the waterbody segments to which your MS4 discharges. For each waterbody segment, please report the number of outfalls discharging into it and, if applicable, any impairments. For Massachusetts list of impaired waters click here: Massachusetts 2010 List of Impaired: Waters http://www.mass.gov/dep/water/resources/101ist6.pdf For New Hampshire list of impaired waters click here: New Hampshire Final 303(d) Materials: http://des.nh.gov/organization/divisions/water/wmb/swga/2010/index.htm Source of pollutants column should be completed with a preliminary source evaluation of pollutants for discharges to impaired waterbodies (see above 303(d) lists) without an approved TMDL in accordance with Section 2.2.2a of the permit Number of Click Waterbody segment that receives flow from outfalls into Pollutant list impairment at left to add, or Pollutant(s) causing impairment, if the MS4 receiving water (select one at a time to add) at right to applicable (select one at a time to remove) segment remove Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved ra Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) e#of## ra Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Chlorophyll -a Dissolved oxygen saturation Escherichia coli Add/Remove Mercury Nitrogen (Total) Oxygen, Dissolved Click to lengthen table e#of## Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Manaaement Proaram Summa Identify the Best Management Practices (BMPs) that will be employed to address each of the six Minimum Control Measures (MCMs). For municipalities/organizations whose MS4 discharges into a receiving water with an approved Total Maximum Daily Load (TMDL) and applicable waste lod allocation (WLA), identify any additional BMPs employed to specifically support the achievement of the WLA in the TMDL section at the end of Part III. For each MCM list each existing or proposed BMP by category and provide a brief description, responsible parties/departments, measurable goals and the year the BMP will be employed (Public education and outreach BMPs also requires a target audience). Use the drop -down menus in each table or enter your own text to override the drop down menu MCM 1: Public Education and Outreach Beginning BMP Media/Category Responsible Year of (enter your own text to override the BMP Description Targeted Audience Department/Parties Measurable Goal BMP drop down menu) (enter your own text to override implemen the drop down menu) tation —73 Residents EA Businesses, Institutions and Commercial Facilities Developers (construction) Industrial Facilities Residents Businesses, Institutions and Commercial Facilities a � a Facilities F_ F_ a0Industrial I A o a oF_ o a oF_ o a 0F_ o � 0F_ o 0F_ o a oF_ J o �� oF_ Hi o Page # of ## Notice of Intent (NOI) for coverage under Small NIS4 General Permit (continued) Part III: Stormwater Management Program Summary MCM 2: Public Involvement and Participation BMP Categorization Brief BMP Description (enter your own text to override the drop down menu) Responsible Department/ Parties Additional Description/ Measurable Goal Beginning Year of BMP implement ation Public Review SWMP Review =3- Public Participation E F 0 F E77� F —� F F73 F 7 L-34 E H L L U L E E E77J E 0 F E::3- E -9 � - E:73- E 0 1 E —_3 r-- d =3- E 0 F E 0 1 E 0 F E=] Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Manaaement Proaram Summa MCM 3: Illicit Discharge Detection and Elimination (IDDE) BMP Categorization (enter your own text to override the drop down menu) BMP Description Responsible Department/Parties (enter your own text to override the drop down menu) Measurable Goal (all text can be overwritten) SSO inventory - Develop SSO inventory within 1 year of effective date of permit Storm sewer system map - Update map within 2 years of effective date of permit and complete full system map 10 years after effective date of permit Written IDDE program development Complete within 1.5 years of the effective date of permit Implement IDDE Program _ Implement catchment investigations according to program and permit conditions Employee Training Train annually Conduct dry weather screening 7 - onduct in accordance with outfall screening procedure and permit conditions Conduct wet weather screening - Conduct in accordance with outfall screening procedure and permit conditions Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Manaaement Proaram Summa MCM 4: Construction Site Stormwater Runoff Control Responsible Department/ Beginning BMP Categorization Year of (enter your own text to override the drop down BMP Description Parties Measurable Goal BMP menu or entered text) (enter your own text to override the drop (all text can be overwritten) implemen down menu) tation Complete written Site inspection and enforcement of procedures of site _ Complete by the end Erosion and Sediment Control (ESC) inspections and of Year 1 measures enforcement procedures Complete written Site plan review procedures of site plan _ Complete by the end review and begin of Year 1 implementation Adoption of requirements for Erosion and Sediment Control construction operators to implement a sediment and erosion control program Adoption of requirements to control wastes, including but not Waste Control limited to, discarded building materials, concrete truck wash out, chemicals, litter, and sanitary wastes. E E73 1w F73- 1w E73 3 E73 � 3 o Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Manaaement Proaram Summa MCM 5: Post -Construction Stormwater Management in New Development and Redevelopment Responsible Department/ Beginning BMP Categorization Year of (enter your own text to override the drop down BMP Description Parties Measurable Goal BMP menu or entered text) (enter your own text to override the (all text can be overwritten) implemen drop down menu) tation The procedures to require submission of as - As -built plans for on -site stormwater built drawings and Require submission of control ensure long term - as -built plans for operation and completed projects maintenance will be a part of the SWMP. Conduct detailed Inventory and priority ranking of MS4- owned properties that may be inventory of MS4 owned Complete 4 years after retrofitted with BMproperties and rank for permit effective date retrofit potential Develop a report assessing existing local regulations to determine Allow green infrastructure the feasibility of making _ Complete 4 years after green infrastructure permit effective date practices allowable when appropriate site conditions exist Develop a report assessing requirements that affect the creation of impervious cover. The Street design and parking lot assessment will help _ Complete 4 years after determine if changes to guidelines design standards for permit effective date streets and parking lots can be modified to support low impact design options. Ensure any stormwater controls or Adoption, amendment management practices for new or modification of a Complete 2 years after development and redevelopment regulatory mechanism to _ permit effective date will prevent or minimize impacts to meet permit water quality. requirements 0 � o a � o a � a a � a a � a Paae # of ## 0 i i n n 0 0 n n Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Manaaement Proaram Summa MCM 6: Municipal Good Housekeeping and Pollution Prevention Responsible Department/ Beginning BMP Categorization Year of (enter your own text to override the drop down BMP Description Parties Measurable Goal (enter your BMP menu or entered text) ur own text to override the (all text can be overwritten) drop down menu) implemen tation Create written O&M procedures for parks and open spaces, buildings and facilities, _ Complete 2 years after and vehicles and equipment permit effective date Inventory all permittee-owned parks and open spaces, buildings and facilities Complete 2 years after (including their storm drains), and _ permit effective date vehicles and equipment Establish and implement program for repair and rehabilitation of MS4 _ Complete 2 years after:1 infrastructure permit effective date Stormwater Pollution Prevention Plan (SWPPP) for maintenance garages, Complete 2 years after transfer stations and other waste- _ permit effective date handling facilities Catch Basin Cleaning Street Sweeping Program Road Salt use optimization program ED El Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part III: Stormwater Management Program Summary Actions for meeting Total Maximum Daily Load (TMDL) Requirements Use the drop -down menus to select the best categorization of your BMP and responsible party. If no options are applicable, or more than one, enter your own text to override drop -down menus. Applicable TMDL Action Description Responsible Department/ Parties (enter your own text to override the drop down menu) E I D El E E E E E El Page # of ## Use the drop -down menus to select the Pollutant causing the water quality limitation and enter the waterbody ID(s) experiencing excursions above water quality standards for that pollutant. Choose the action description from the dropdown menu and indicate the responsible party. If no options are applicable, or more than one, enter your own text to override drop -down menus. Actions for meeting Requirements Related to water Quality Limited Waters Part III: Stormwater Management Program Summary Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Pollutant Waterbody ID(s) Action Description Responsible Department/Parties (enter your own text to override the drop down menu) Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part IV: Notes and additional information Use the space below to provide any additional information about your MS4 program Click to add text Page # of ## Notice of Intent (NOI) for coverage under Small MS4 General Permit (continued) Part V: Certification 1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, I certify that the information submitted is, to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Name: Signature Field NOI Submission Title: Date: Please submit the form electronically via email using the "submit by Email" button below or send in a CD with your completed NOI. You may also print and submit via mail at the address below if you choose not to submit electronically. Outfall map required in Part I of the NOI (if applicable) can be submitted electronically as an email attachment OR as a paper copy. Permittees that choose to submit their NOI electronically by email or by mailing a CD with the completed NOI form to EPA, will be able to download a partially filled Year 1 Annual Report at a later date from EPA. Submit by Email Submit by email using this button. Or, send an email with attachments to: stormwater.repo rts epa.gov Save Save NOI for your records EPA Submittal Address: United States Environmental Protection Agency 5 Post Office Square - Suite 100 Mail Code - OEP06-1 Boston, Massachusetts 02109-3912 ATTN: Newton Tedder State Submittal Address Massachusetts Department of Environmental Protection One Winter Street - 5th Floor Boston, MA 02108 ATTN: Fred Civian MA MS4 General Permit Appendix F [APPENDIX F Requirements for Discharges to Impaired Waters with an Approved TMDL Table of Contents A. Requirements for Discharges to Impaired Waters with an Approved MassDEP In State TMDL............................................................................................................................2 I. Charles River Watershed Phosphorus TMDL Requirements.....................................2 II. Lake and Pond Phosphorus TMDL Requirements..................................................18 III. Bacteria and Pathogen TMDL Requirements........................................................27 IV. Cape Cod Nitrogen TMDL Requirements.............................................................40 V. Assabet River Phosphorus TMDL Requirements...................................................44 B. Requirements for Discharges to Impaired Waters with an Approved Out of State TMDL..........................................................................................................................47 I. Nitrogen TMDL Requirements................................................................................47 II. Phosphorus TMDL Requirements...........................................................................51 III. Bacteria and Pathogen TMDL Requirements........................................................55 IV. Metals TMDL Requirements.................................................................................58 C. Requirements for Discharges to Impaired Waters with a Regional TMDL.................61 I. The "Northeast Regional Mercury TMDL(2007)................................................... 61 Attachment 1 — Method To Calculate Baseline Watershed Phosphorus Load For Lake And Pond Phosphorus TMDLs (Applicable To part II Of Appendix F Only) And Method To Calculate Increases in Phosphorus Load due to Development Attachment 2 — Phosphorus Reduction Credits For Selected Enhanced Non -Structural BMPs Attachment 3 - Phosphorus Reduction Credits For Selected Structural BMPs Page 1 of 61 MA MS4 General Permit Appendix F A. Requirements for Discharges to Impaired Waters with an Approved MassDEP In State TMDL I. Charles River Watershed Phosphorus TMDL Requirements On October 17, 2007, EPA approved the Final TMDL for Nutrients in the Lower Charles River Basin (Lower Charles TMDL)' and on June 10, 2011 EPA approved the Total Maximum Daily Load for Nutrients in the Upper/Middle Charles River (Upper/Middle Charles TMDL)2. The following phosphorus reduction requirements address phosphorus in MS4 discharges. To address the discharge of phosphorus from its MS4, the permittee shall develop a Phosphorus Control Plan (PCP) designed to reduce the amount of phosphorus in stormwater (SW) discharges from its MS4 to the Charles River and its tributaries. The PCP shall be completed in phases and the permittee shall add it as an attachment to its written SWMP upon completion and report in annual reports pursuant to part 4.4 of the Permit on its progress toward achieving its Phosphorus Reduction Requirement. The PCP shall be developed and fully implemented as soon as possible but no later than 20 years after the permit effective date in accordance with the phases and schedule outlined below. Each Phase shall contain the elements required of each phase as described in parts a.through c below. The timing of each phase over 20 years from the permit effective date is: 1-5 years after 5-10 years after 10-15 years after 15-20 years after permit effective permit effective permit effective permit effective date date date date Create Phase 1 Implement Phase 1 Plan Plan Create Phase 2 Implement Phase!P! Plan Plan Create Phase 3hase Plan a. Phase 1 1) The permittee shall complete a written Phase 1 plan of the PCP five years after the permit effective date and fully implement the Phase 1 plan of the PCP as soon as possible but no longer than 10 years after the permit effective date. 2) The Phase 1 plan of the PCP shall contain the following elements and has the following required milestones: Item Phase 1 of the PCP Component and Completion Number Milestones Date 1-1 Legal analysis 2 years after permit effective date ' Massachusetts Department of Environmental Protection. Charles River Basin. CN 301.1 2 Massachusetts Department of Environmental Protection. in the Upper/Middle Charles River Basin, Massachusetts. 2007. Final TMDL for Nutrients in the Lower 2011. Total Maximum Daily Load for Nutrients CN 272.0 Page 2 of 61 MA MS4 General Permit Appendix F 1-2 Funding source assessment. 3 years after permit effective date 1-3 Define scope of PCP (PCP Area) Baseline 4 years after Phosphorus Load and Phosphorus Reduction permit Requirement and Allowable Phosphorus Load effective date 1-4 Description of Phase 1 planned nonstructural 5 years after controls permit effective date 1-5 Description of Phase 1 planned structural 5 years after controls permit effective date 1-6 Description of Operation and Maintenance 5 years after program for structural controls permit effective date 1-7 Phase 1 implementation schedule 5 years after permit effective date 1-8 Estimated cost for implementing Phase 1 of the 5 years after PCP permit effective date 1-9 Complete Written Phase 1 PCP 5 years after permit effective date 1-10 Full implementation of nonstructural controls 6 years after permit effective date 1-11 Performance Evaluation 6, and 7 years after permit effective date 1-12 1. Performance Evaluation. 8 years after 2. Full implementation of all structural controls permit used to demonstrate that the total phosphorus effective date export rate (Pexp) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(PQao,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.80 Pex < Pallow + (PRR X 0.80) 1-13 Performance Evaluation 9 years after permit effective date 1-14 1. Performance Evaluation. 10 years after 2. Full implementation of all structural controls permit used to demonstrate that the total phosphorus effective date export rate (Pp) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(Pa,lo,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.75 Page 3 of 61 MA MS4 General Permit Appendix F Pex < Pallow + (PRR X 0.75) Table F-1:Phase 1 of the PCP components and Milestones 3) Description of Phase 1 PCP Components Legal Analysis- The permittee shall develop and implement an analysis that identifies existing regulatory mechanisms available to the MS4 such as by- laws and ordinances, and describes any changes to regulatory mechanisms that may be necessary to effectively implement the entire PCP. This may include the creation or amendment of financial and regulatory authorities. The permittee shall adopt necessary regulatory changes by the end of the permit term. Funding source assessment — The permittee shall describe known and anticipated funding mechanisms (e.g. general funding, enterprise funding, stormwater utilities) that will be used to fund PCP implementation. The permittee shall describe the steps it will take to implement its funding plan. This may include but is not limited to conceptual development, outreach to affected parties, and development of legal authorities. Scope of the PCP, Baseline Phosphorus Load (Phase), Phosphorus Reduction Requirement (PRR) and Allowable Phosphorus Load (Parrow - The permittee shall indicate the area in which it plans to implement the PCP. The permittee must choose one of the following: (1) to implement its PCP in the entire area within its jurisdiction (for municipalities this would be the municipal boundary) within the Charles River Watershed; or (2) to implement its PCP only in the urbanized area portion of the permittee's jurisdiction within the Charles River Watershed. The implementation area selected by the permittee is known as the "PCP Area" for that permittee. Table F-23 and Table F-34 list the permittees subject to phosphorus reduction requirements along with the estimated Baseline Phosphorous Loads in mass/yr, the calculated Allowable Stormwater Phosphorus Load in mass/yr, the Stormwater Phosphorus Reduction Requirement in mass/yr and the respective percent reductions necessary. The two tables contain different reduction requirements for each permittee based on the PCP Area they choose (see above). If the permittee chooses to implement the PCP in its entire jurisdiction, the permittee may demonstrate compliance with the Phosphorus Reduction Requirement and Allowable Phosphorus Load requirements applicable to it through structural and non-structural controls on discharges that occur outside the regulated area. If the permittee chooses to implement the PCP in its regulated area only, the permittee must demonstrate compliance with the Phosphorus Reduction Requirement and Allowable Phosphorus Load requirements applicable to it through structural s The estimated Baseline Phosphorus Load, Allowable Phosphorus Load, Phosphorus Reduction Requirement and percent reductions presented in Table F-2 apply to the entire watershed land area that drains to the Charles River and its tributaries within the permittee's jurisdiction. a The estimated Baseline Phosphorus Load, Allowable Phosphorus Load, Phosphorus Reduction Requirement and percent reductions presented in Table F-3 apply only to the urbanized area portion of the permittee's jurisdiction that drains to the Charles River or its tributaries. Page 4 of 61 MA MS4 General Permit Appendix F and non-structural controls on discharges that occur within the regulated area only. The permittee shall select the Baseline Phosphorus Load, Stormwater Phosphorus Reduction Requirement and Allowable Phosphorus Load that corresponds to the PCP Area selected. The selected Stormwater Phosphorus Reduction Requirement and Allowable Phosphorus Load will be used to determine compliance with PCP milestones of this Phase and Phase 2 and Phase 3. If the permittee chooses to implement its PCP in all areas within its jurisdiction within the Charles River Watershed, then the permittee shall use Table F-2 to determine the Baseline Phosphorus Load, Stormwater Phosphorus Reduction Requirement and Allowable Phosphorus Load for its PCP Area. If the permittee chooses to implement its PCP only within the regulated area within the Charles River Watershed, then the permittee shall use Table F-3 to determine the Baseline Phosphorus Load, Stormwater Phosphorus Reduction Requirement and Allowable Phosphorus Load for its PCP Area. The Permittee may submit more accurate land use data from 2005, which is the year chosen as the baseline land use for the purposes of permit compliance, for EPA to recalculate baseline phosphorus stormwater loads for use in future permit reissuances. Updated land use maps, land areas, characteristics, and MS4 area and catchment delineations shall be submitted to EPA along with the year 4 annual report in electronic GIS data layer form for consideration for future permit requirements5. Until such a time as future permit requirements reflect information submitted in the year 4 annual report, the permittee shall use the Baseline Phosphorus Load, Stormwater Phosphorus Reduction Requirement and Allowable Phosphorus Load Table F-2 (if its PCP Area is the permittee's entire jurisdiction) or Table F-3 (if its PCP Area is the regulated area only) to calculate compliance with milestones for Phase 1, 2, and 3 of the PCP. Description of Phase 1 planned non-structural controls — The permittee shall describe the non-structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-1. The description of non-structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions that are expected to result from their implementation in units of mass/yr. Annual phosphorus reduction from non-structural BMPs shall be calculated consistent with Attachment 2 to Appendix F. Description of Phase 1 planned structural controls — The permittee shall develop a priority ranking of areas and infrastructure within the municipality for potential implementation of structural phosphorus controls during Phase 1. The ranking shall be developed through the use of available 5 This submission is optional and needs only be done if the permittee has more accurate land use information from 2005 than information provided by MassGIS (hgp://www.mass.aov/anf/research-and- tech/it-serv-and-support/application-serv/office-of-geo graphic-information- massgis/datalayers/lus2005.html, retrieved 10/1/2013) or the permittee has updated MS4 drainage area characteristics and the permittee would like to update the Baseline Phosphorus Load. Page 5 of 61 MA MS4 General Permit Appendix F screening and monitoring results collected during the permit term either by the permittee or another entity and the mapping required pursuant to part 2.3.4.6 of the Permit. The permittee shall also include in this priority ranking a detailed assessment of site suitability for potential phosphorus control measures based on soil types and other factors. The permittee shall coordinate this activity with the requirements of part 2.3.6.8.b of the Permit. A description and the results of this priority ranking shall be included in Phase 1 of the PCP. The permittee shall describe the structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-1. The description of structural controls shall include the planned and existing measures, the areas where the measures will be implemented or are currently implemented, and the annual phosphorus reductions in units of mass/yr that are expected to result from their implementation. Structural measures to be implemented by a third party may be included in a municipal PCP. Annual phosphorus reductions from structural BMPs shall be calculated consistent with Attachment 3 to Appendix F. Description of Operation and Maintenance (O&M) Program for all planned and existing structural BMPs — The permittee shall establish an Operation and Maintenance Program for all structural BMPs being claimed for phosphorus reduction credit as part of Phase 1 of the PCP. This includes BMPs implemented to date as well as BMPs to be implemented during Phase 1 of the PCP. The Operation and Maintenance Program shall become part of the PCP and include: (1) inspection and maintenance schedule for each BMP according to BMP design or manufacturer specification and (2) program or department responsible for BMP maintenance. Phase 1 Implementation Schedule — A schedule for implementation of all planned Phase 1 BMPs, including, as appropriate: obtaining funding, training, purchasing, construction, inspections, monitoring, operation and maintenance activities, and other assessment and evaluation components of implementation. Implementation of planned BMPs must begin upon completion of the Phase 1 Plan, and all non-structural BMPs shall be fully implemented within six years of the permit effective date. Structural BMPs shall be designed and constructed to ensure the permittee will comply with the 8 and 10 year phosphorus load milestones established in Table F- 1. The Phase 1 plan shall be fully implemented as soon as possible, but no later than 10 years after the effective date of permit. Estimated cost for implementing Phase 1 of the PCP — The permittee shall estimate the cost of implementing the Phase 1 non-structural and structural controls and associated Operation and Maintenance Program. This cost estimate can be used to assess the validity of the funding source assessment completed by year 3 after the permit effective date and to update funding sources as necessary to complete Phase 1. Complete written Phase 1 Plan — The permittee must complete the written Phase 1 Plan of the PCP no later than 5 years after the permit effective date. The complete Phase 1 Plan shall include Phase 1 PCP item numbers 1-1 through 1-7 in Table F-1. The permittee shall make the Phase 1 Plan Page 6 of 61 MA MS4 General Permit Appendix F available to the public for public comment during Phase 1 Plan development. EPA encourages the permittee to post the Phase I Plan online to facilitate public involvement. Performance Evaluation —The permittee shall evaluate the effectiveness of the PCP by tracking the phosphorus reductions achieved through implementation of structural and non-structural BMPs6 and tracking increases resulting from development. Phosphorus reductions shall be calculated consistent with Attachment 2 to Appendix F (non-structural BMP performance) and Attachment 3 to Appendix F (structural BMP performance) for all BMPs implemented to date. Phosphorus export increases since 2005 due to development shall be calculated consistent with Attachment 1 to Appendix F. Phosphorus loading increases and reductions in unit of mass/yr shall be added or subtracted from the applicable Baseline Phosphorus Load given in Table F-2 or Table F-3 depending on the Scope of PCP chosen to estimate the yearly phosphorous export rate from the PCP Area. The permittee shall also include all information required in part I.2 of this Appendix in each performance evaluation. Performance evaluations will be included as part of each permittee's annual report as required by part 4.4 of the Permit. Community Annual Stormwater Phosphorus Load Reduction by Permittee, Charles River Watershed Stormwater Stormwater Baseline Phosphorus Allowable Percent Community Phosphorus Load Phosphorus Reduction in Load, kg/yr Reduction Load, kg/yr Phosphorus Requirement Load (%) kg/yr Arlington 106 57 49 53% Ashland 67 23 44 34% Bellingham 947 331 616 35% Belmont 202 86 116 42% 48 Brookline 1,635 789 846 % Cambridge 512 263 249 51% Dedham 805 325 480 40% Dover 831 137 694 17% Foxborough 2 0 2 0% Franklin 2,344 818 1,526 35% 6 In meeting its phosphorus reduction requirements a permittee may quantify phosphorus reductions by actions undertaken by another entity, except where those actions are credited to MassDOT or another permittee identified in Appendix F Table F-2 or F-3. Page 7 of 61 MA MS4 General Permit Appendix F Community Annual Stormwater Phosphorus Load Reduction by Permittee, Charles River Watershed Community Baseline Phosphorus Load, kg/yr Stormwater Phosphorus Load Reduction Requirement kg/yr Allowable Phosphorus Load, kg/yr Stormwater Percent Reduction in Phosphorus Load (%) Holliston 1,543 395 1,148 26% Hopedale 107 37 70 35% Hopkinton 292 66 226 22% Lexington 530 194 336 37% Lincoln 593 101 492 17% Medfield 955 277 678 29% Medway 1,063 314 749 30% Mendon 29 9 20 31% Milford 1,611 663 948 41% Millis 969 248 721 26% Natick 1,108 385 723 35% Needham 1,772 796 976 45% Newton 3,884 1,941 1,943 50% Norfolk 1,004 232 772 23% Somerville 646 331 315 51% Sherborn 846 131 715 16% Walpole 159 28 131 18% Waltham 2,901 1,461 1,400 50% Watertown 1,127 582 545 52% Wayland 46 15 31 33% Wellesley 1,431 661 770 46% Weston 1,174 281 893 24% Westwood 376 114 262 30% Wrentham 618 171 447 28% Mass-DCR 421 91 1 330 1 22% Table F-2: Baseline Phosphorus Load, Phosphorus Reduction Requirement, Allowable Phosphorus Load and Percent Reduction in Phosphorus Load from Charles River Watershed. For use when PCP Area is chosen to be the entire community within the Charles River Watershed. Page 8 of 61 MA MS4 General Permit Appendix F Urbanized Area Annual Stormwater Phosphorus Load Reduction by Permittee, Charles River Watershed Community Baseline Watershed phosphorus Load, kg/yr Stormwater Phosphorus Load Reduction Requirement, kg/yr Allowable Phosphorus Load , kg/yr Stormwater Percent Reduction in Phosphorus Load (/o) Arlington 106 57 49 53% Ashland 67 23 44 34% Bellingham 801 291 510 36% Belmont 202 86 116 42% Brookline 1,635 789 846 48 % Cambridge 512 263 249 51% Dedham 805 325 480 40% Dover 282 54 228 19% Foxborou 2 0 2 0% Franklin 2,312 813 1,499 35% Holliston 1,359 369 990 27% Hopedale 107 37 70 35% Hopkinton 280 65 215 23% Lexington 525 193 332 37% Lincoln 366 63 303 17% Medfield 827 267 560 33% Medway 1,037 305 732 29% Mendon 10 5 5 50% Milford 1,486 653 833 44% Millis 501 159 342 32% Natick 994 359 635 36% Needham 1,771 795 976 45% Newton 3,884 1,941 1,943 50% Norfolk 1,001 231 770 23% Somerville 646 331 315 51% Sherborn 203 38 165 19% Walpole 159 28 131 18% Waltham 2,901 1,461 1,440 50% Watertown 1,127 582 545 52% Wayland 46 15 31 33% Wellesley 1,431 661 770 46% Page 9 of 61 MA MS4 General Permit Appendix F Urbanized Area Annual Stormwater Phosphorus Load Reduction by Permittee, Charles River Watershed Stormwater Stormwater Baseline Phosphorus Allowable Percent Community Watershed Load Phosphorus Reduction in phosphorus Reduction Load , kg/yr Phosphorus Load, kg/yr Requirement, Load (/o) kg/yr Weston 1,174 281 893 24% Westwood 346 108 238 31% Wrentham 556 159 397 29% Mass DCR 396 89 307 22% Table F-3: Baseline Phosphorus Load, Phosphorus Reduction Requirement, Allowable Phosphorus Load and Percent Reduction in Phosphorus Load from Charles River Watershed. For use when PCP Area is chosen to be only the urbanized area portion of a permittee's jurisdiction within the Charles River Watershed. b. Phase 2 1) The permittee shall complete the Phase 2 Plan of the PCP 10 years after the permit effective date and fully implement the Phase 2 plan of the PCP as soon as possible but no longer than 15 years after the permit effective date. 2) The Phase 2 plan of the PCP shall be added to the Phase 1 Plan and contain the following elements and has the following required milestones: Item Phase 2 of the PCP Component and Completion Date Number Milestones 2-1 Update Legal analysis As necessary 2-2 Description of Phase 2 planned 10 years after nonstructural controls permit effective date 2-3 Description of Phase 2 planned structural 10 years after controls permit effective date 2-4 Updated description of Operation and 10 years after Maintenance Program permit effective date 2-5 Phase 2 implementation schedule 10 years after permit effective date 2-6 Estimated cost for implementing Phase 2 of 10 years after the PCP permit effective date Page 10 of 61 MA MS4 General Permit Appendix F 2-7 Complete written Phase 2 Plan 10 years after permit effective date 2-8 Performance Evaluation. 11, and 12 years after permit effective date 2-9 1. Performance Evaluation. 13 years after 2. Full implementation of all structural permit effective controls used to demonstrate that the date total phosphorus export rate (PAP) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(Pallo,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.65 PeXP < Pallow + (PRR X 0.65) 2-10 Performance Evaluation 14 years after permit effective date 2-11 1. Performance Evaluation. 15 years after 2. Full implementation of all structural permit effective controls used to demonstrate that the date total phosphorus export rate (P,,p) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(PQuo,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.50 Pex < fallow + (PRR X 0.50) Table F-4: Phase 2 of the PCP components and Milestones 3) Description of Phase 2 PCP Components Updated Legal Analysis- The permittee shall update the legal analysis completed during Phase 1 of the PCP as necessary to include any new or augmented bylaws, ordinances or funding mechanisms the permittee has deemed necessary to implement the PCP. The permittee shall use experience gained during Phase 1 to inform the updated legal analysis. The permittee shall adopt necessary regulatory changes as soon as possible to implement the Phase 2 Plan. Description of Phase 2 planned non-structural controls — The permittee shall describe the non-structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-4. The description of non-structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions that are expected to result from their implementation in units of mass/yr. Annual phosphorus reduction from non-structural BMPs shall be calculated consistent with Attachment 2 to Appendix F. Page 11 of 61 MA MS4 General Permit Appendix F ' See footnote 6 Description of planned Phase 2 structural controls — The permittee shall develop a priority ranking of areas and infrastructure within the municipality for potential implementation of phosphorus control practices during Phase 2. The ranking shall build upon the ranking developed for Phase 1. The permittee shall describe the structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-4. The description of structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions in units of mass/yr that are expected to result from their implementation. Structural measures to be implemented by a third party' may be included in a municipal PCP. Annual phosphorus reductions from structural BMPs shall be calculated consistent with Attachment 3 to Appendix F. Updated description of Operation and Maintenance (O&M,) Program for all planned and existing structural BMPs — The permittee shall establish an Operation and Maintenance Program for all structural BMPs being claimed for phosphorus reduction credit as part of Phase 1 and 2 of the PCP. This includes BMPs implemented to date as well as BMPs to be implemented during Phase 2 of the PCP. The Operation and Maintenance Program shall become part of the PCP and include: (1) inspection and maintenance schedule for each BMP according to BMP design or manufacturer specification and (2) program or department responsible for BMP maintenance. Phase 2 Implementation Schedule — A schedule for implementation of all planned Phase 2 BMPs, including, as appropriate: funding, training, purchasing, construction, inspections, monitoring, O&M activities and other assessment and evaluation components of implementation. Implementation of planned BMPs must begin upon completion of the Phase 2 Plan. Structural BMPs shall be designed and constructed to ensure the permittee will comply with the 13 and 15 year milestones established in Table F-4. The Phase 2 plan shall be fully implemented as soon as possible, but no later than 15 years after the effective date of permit. Estimated cost for implementing Phase 2 of the PCP — The permittee shall estimate the cost of implementing the Phase 2 non-structural and structural controls and associated Operation and Maintenance Program. This cost estimate can be used to plan for the full implementation of Phase 2. Complete written Phase 2 Plan — The permittee must complete a written Phase 2 Plan of the PCP no later than 10 years after the permit effective date. The complete Phase 2 Plan shall include Phase 2 PCP item numbers 2-1 through 2-6 in Table F-4. The permittee shall make the Phase 2 Plan available to the public for public comment during Phase 2 plan development. EPA encourages the permittee to post the Phase 2 Plan online to facilitate public involvement. Page 12 of 61 MA MS4 General Permit Appendix F Performance Evaluation — The permittee shall evaluate the effectiveness of the PCP by tracking the phosphorus reductions achieved through implementation of structural and non-structural BMPs' and tracking increases resulting from development. Phosphorus reductions shall be calculated consistent with Attachment 2 to Appendix F (non-structural BMP performance) and Attachment 3 to Appendix F (structural BMP performance) for all BMPs implemented to date. Phosphorus export increases due to development shall be calculated consistent with Attachment 1 to Appendix F. Phosphorus loading increases and reductions in unit of mass/yr shall be added or subtracted from the applicable Baseline Phosphorus Load given in Table F-2 or Table F-3 depending on the Scope of PCP chosen to estimate the yearly phosphorous export rate from the PCP Area. The permittee shall also include all information required in part L2 of this Appendix in each performance evaluation. Performance evaluations will be included as part of each permittee's annual report as required by part 4.4 of the Permit. c. Phase 3 8 See footnote 9 1) The permittee shall complete the Phase 3 Plan of the PCP 15 years after the permit effective date and fully implement the Phase 3 plan of the PCP as soon as possible but no longer than 20 years after the permit effective date. 2) The Phase 3 plan of the PCP shall be added to the Phase 1 Plan and the Phase 2 Plan to create the comprehensive PCP and contain the following elements and has the following required milestones: Item Phase 3 of the PCP Component and Completion Number Milestones Date 3-1 Update Legal analysis As necessary 3-2 Description of Phase 3 planned 15 years after nonstructural controls permit effective date 3-3 Description of Phase 3 planned structural 15 years after controls permit effective date 3-4 Updated description of Operation and 15 years after Maintenance (O&M) Program permit effective date 3-5 Phase 3 implementation schedule 15 years after permit effective date 3-6 Estimated cost for implementing Phase 3 15 years after of the PCP permit effective date 3-7 Complete written Phase 3 Plan 15 years after permit effective date Page 13 of 61 MA MS4 General Permit Appendix F 3-8 Performance Evaluation. 16, and 17 years after permit effective date 3-9 1. Performance Evaluation. 18 years after 2. Full implementation of all structural permit effective controls used to demonstrate that the date total phosphorus export rate (P,,,,) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(PQuo,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.30 Pex < Pallow + (PRR X 0.30) 3-10 Performance Evaluation 19 years after permit effective date 3-11 1. Performance Evaluation. 20 years after 2. Full implementation of all structural permit effective controls used to demonstrate that the date total phosphorus export rate (Pexp) from the PCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load (Parrow) Pexp < Pallow Table F-5:Phase 3 of the PCP components and Milestones 3) Description of Phase 3 PCP Components Updated Legalysis- The permittee shall update the legal analysis completed during Phase 1 and Phase 2 of the PCP as necessary to include any new or augmented bylaws, ordinances or funding mechanisms the permittee has deemed necessary to implement the PCP. The permittee shall use experience gained during Phase 1 and Phase 2 to inform the updated legal analysis. The permittee shall adopt necessary regulatory changes as soon as possible to implement the Phase 3 Plan. Description of Phase 3 planned non-structural controls — The permittee shall describe the non-structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-5. The description of non-structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions that are expected to result from their implementation in units of mass/yr. Annual phosphorus reduction from non-structural BMPs shall be calculated consistent with Attachment 2 to Appendix F. Description of planned Phase 3 structural controls — The permittee shall develop a priority ranking of areas and infrastructure within the municipality for potential implementation of phosphorus control practices during Phase 3. The ranking shall build upon the ranking developed for Page 14 of 61 MA MS4 General Permit Appendix F ' See footnote 9 Phase 1 and 2. The permittee shall describe the structural stormwater control measures necessary to support achievement of the phosphorus export milestones in Table F-5. The description of structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions in units of mass/yr that are expected to result from their implementation. Structural measures to be implemented by a third party may be included in a municipal PCP. Annual phosphorus reduction from structural BMPs shall be calculated consistent with Attachment 3 to Appendix F. Updated description of Operation and Maintenance (O&M) Program for all planned and existing structural BMPs — The permittee shall establish an Operation and Maintenance Program for all structural BMPs being claimed for phosphorus reduction credit as part of Phase 1, 2 and 3 of the PCP. This includes BMPs implemented to date as well as BMPs to be implemented during Phase 3 of the PCP. The Operation and Maintenance Program shall become part of the PCP and include: (1) inspection and maintenance schedule for each BMP according to BMP design or manufacturer specification and (2) program or department responsible for BMP maintenance. Phase 3 Implementation Schedule — A schedule for implementation of all planned Phase 3 BMPs, including, as appropriate: funding, training, purchasing, construction, inspections, monitoring, O&M activities and other assessment and evaluation components of implementation. Implementation of planned BMPs must begin upon completion of the Phase 3 Plan. Structural BMPs shall be designed and constructed to ensure the permittee will comply with the 18 and 20 year milestones established in Table F-5. The Phase 3 plan shall be fully implemented as soon as possible, but no later than 20 years after the effective date of permit. Estimated cost for implementing Phase 3 of the PCP — The permittee shall estimate the cost of implementing the Phase 3 non-structural and structural controls and associated Operation and Maintenance Program. This cost estimate can be used to plan for the full implementation of Phase 3. Complete written Phase 3 Plan — The permittee must complete the written Phase 3 Plan of the PCP no later than 15 years after the permit effective date. The complete Phase 3 Plan shall include Phase 3 PCP item numbers 3- 1 through 3-6 in Table F-5. The permittee shall make the Phase 3 Plan available to the public for public comment during Phase 3 Plan development. EPA encourages the permittee to post the Phase 3 Plan online to facilitate public involvement. Performance Evaluation — The permittee shall evaluate the effectiveness of the PCP by tracking the phosphorus reductions achieved through implementation of structural and non-structural BMPs' and tracking increases resulting from development. Phosphorus reductions shall be calculated consistent with Attachment 2 to Appendix F (non-structural BMP Page 15 of 61 MA MS4 General Permit Appendix F 2. Reporting performance) and Attachment 3 to Appendix F (structural BMP performance) for all BMPs implemented to date. Phosphorus export increases due to development shall be calculated consistent with Attachment 1 to Appendix F. Phosphorus loading increases and reductions in unit of mass/yr shall be added or subtracted from the applicable Baseline Phosphorus Load given in Table F-2 or Table F-3 depending on the Scope of PCP chosen to estimate the yearly phosphorous export rate from the PCP Area. The permittee shall also include all information required in part I.2 of this Appendix in each performance evaluation. Performance evaluations will be included as part of each permittee's annual report as required by part 4.4 of the Permit. Beginning 1 year after the permit effective date, the permittee shall include a progress report in each annual report on the planning and implementation of the PCP. Beginning five (5) years after the permit effective date, the permittee shall include the following in each annual report submitted pursuant to part 4.4 of the Permit: a. All non-structural control measures implemented during the reporting year along with the phosphorus reduction in mass/yr (PNs.ed) calculated consistent with Attachment 2 to Appendix F b. Structural controls implemented during the reporting year and all previous years including: a. Location information of structural BMPs (GPS coordinates or street address) b. Phosphorus reduction from all structural BMPs implemented to date in mass/yr (Ps.ed) calculated consistent with Attachment 3 to Appendix F c. Date of last completed maintenance and inspection for each Structural control c. Phosphorus load increases due to development over the previous reporting period and incurred since 2005 (PDEvinc) calculated consistent with Attachment 1 to Appendix F. d. Estimated yearly phosphorus export rate (P,,) from the PCP Area calculated using Equation 2. Equation 2 calculates the yearly phosphorus export rate by subtracting yearly phosphorus reductions through implemented nonstructural controls and structural controls to date from the Baseline Phosphorus Load and adding loading increases incurred through development to date. This equation shall be used to demonstrate compliance with the phosphorus reduction milestones required as part of each phase of the PCP. P mass = P mass - CP mass + P mass I + P mass exp ( yr ) base ( yr ) \ Sred (mass ) NSred ( Yr )/ DEVinc ( yr ) Equation 1. Equation used to calculate yearly phosphorus export rate from the chosen PCP Area. PeXP Current phosphorus export rate from the PCP Area in mass/year. Passe baseline phosphorus export rate from LPCP Area in mass/year. Psed= yearly phosphorus reduction from implemented structural controls in the PCP Area in mass/year. PNs.ed= yearly phosphorus reduction from implemented non-structural controls in the PCP Area in mass/year. PDEVi., yearly phosphorus increase resulting from development since 2005 in the PCP Area in mass/year. Page 16 of 61 MA MS4 General Permit Appendix F e. Certification that all structural BMPs are being inspected and maintained according to the O&M program specified as part of the PCP. The certification statement shall be: I certify under penalty of law that all source control and treatment Best Management Practices being claimed for phosphorus reduction credit have been inspected, maintained and repaired in accordance with manufacturer or design specification. I certify that, to the best of my knowledge, all Best Management Practices being claimed for a phosphorus reduction credit are performing as originally designed. f. Certification that all municipally owned and maintained turf grass areas are being managed in accordance with Massachusetts Regulation 331 CMR 31 pertaining to proper use of fertilizers on turf grasses (see http://www.mass.gov/courts/docs/lawlib/300-399cmr/330cmr3l.pdf ). 3. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part A.I.1. as follows. a. The permittee is relieved of its additional requirements as of the date when the following conditions are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of phosphorus are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. When the criteria in Appendix F part A.1.3.a. are met, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part A.I.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part A.I.1 to date to reduce phosphorus in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part A.I.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non- structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications, and the reporting requirements of Appendix F part I.2. remain in place. Page 17 of 61 MA MS4 General Permit Appendix F II. Lake and Pond Phosphorus TMDL Requirements Between 1999 and 2010 EPA has approved 13 Lake TMDLs10 completed by MassDEP covering 78 lakes and ponds within the Commonwealth of Massachusetts. Any permittee (traditional or non-traditional) that discharges to a waterbody segment in Table F-6 is subject to the requirements of this part. Permittees that operate regulated MS4s (traditional and non-traditional) that discharge to the identified impaired waters or their tributaries must reduce phosphorus discharges to support achievement of phosphorus load reductions identified in the TMDLs. To address phosphorus, all permittees with a phosphorus reduction requirement greater than 0% shall develop a Lake Phosphorus Control Plan (LPCP) designed to reduce the amount of phosphorus in stormwater discharges from its MS4 to the impaired waterbody or its tributaries in accordance with the phosphorus load reduction requirements set forth in Table F-6 below. Permittees discharging to waterbodies in Table F-6 with an associated 0% Phosphorus Required Percent Reduction are subject to Appendix F part II.2.f and are relieved of the requirements of Appendix F part II.1.i through Appendix F part II.2.e Table F-6 identifies the primary municipalities" located within the watershed of the respective lake or pond and the percent phosphorus reductions necessary from urban stormwater sources. Any permittee (traditional or non-traditional) that discharges to a lake or pond listed in Table F-6 or its tributaries is subject to the same phosphorus percent reduction requirements associated with that lake or pond. Primary Municipality Waterbody Name Required Percent Reduction Auburn Leesville Pond 31 % Auburn Pond 24% Eddy Pond 0% Pondville Pond 8% Stoneville Pond 3% Charlton Buffumville Lake 28% Dresser Hill Pond 17% Gore Pond 14% Granite Reservoir 11 % Jones Pond 13% Pierpoint Meadow Pond 27% Pikes Pond 38% Dudley Gore Pond 14% io Final TMDLs for lakes and ponds in the Northern Blackstone River Watershed, Chicopee Basin, Connecticut Basin, French Basin, Millers Basin and Bare Hill Pond, Flint Pond, Indian Lake, Lake Boon, Leesville Pond, Salisbury Pond, White Island Pond, Quaboag Pond and Quacumquasit Pond can be found here: httD://www.mass.i!ov/eea/aaencies/massdeD/water/watersheds/total-maximum-dailv-loads-tmdls.html " Primary municipalities indicate the municipality in which the majority of the lake or pond is located but does not necessarily indicate each municipality that has urbanized area that discharges to the lake or pond or its tributaries. Page 18 of 61 MA MS4 General Permit Appendix F Primary Municipality Waterbody Name Required Percent Reduction Lamer Pond 55% New Pond 56% Pierpoint Meadow Pond 27% Shepherd Pond 25% Tobins Pond 62% Wallis Pond 54% Gardner Hilchey Pond 27% Parker Pond 47% Bents Pond 52% Ramsdall Pond 49% Grafton Flint Pond/Lake Quinsigamond 59% Granby Aldrich Lake East 0% Hadley Lake Warner 24% Harvard Bare Hill Pond 2% Hudson Lake Boon 28% Leicester Smiths Pond 30% Southwick Pond 64% Cedar Meadow Pond 17% Dutton Pond 23% Greenville Pond 14% Rochdale Pond 8% Ludlow Minechoag Pond 48% Millbury Brierly Pond 14% Dorothy Pond 1 % Howe Reservoir 48% Oxford Buffumville Lake 28% Hudson Pond 37% Lowes Pond 51% McKinstry Pond 79% Robinson Pond 8% Texas Pond 21% Shrewsbury Flint Pond/Lake Quinsigamond 49% Jordan Pond 60% Mill Pond 43% Newton Pond 19% Shirley Street Pond 30% Spencer Quaboag Pond 29% Page 19 of 61 MA MS4 General Permit Appendix F Primary Municipality Waterbody Name Required Percent Reduction Quacumquasit Pond 2% Jones Pond 13% Sugden Reservoir 31% Springfield Loon Pond 10% Long Pond 56% Mona Lake 57% Stow Lake Boon 28% Templeton Brazell Pond 62% Depot Pond 50% Bourn -Hadley Pond 49% Greenwood Pond 2 56% Wilbraham Spectacle Pond 45% Winchendon Lake Denison 22% Stoddard Pond 24% Whitney Pond 16% Whites Mill Pond 21% Table F-6: Phosphorus impaired Lakes or Ponds subject to a TMDL along with primary municipality and required percent reduction of phosphorus from urban stormwater sources i. The LPCP shall be implemented in accordance with the following schedule and contain the following elements: a. LPCP Implementation Schedule — The permittee shall complete its LPCP and fully implement all of the control measures in its LPCP as soon as possible but no later than 15 years after the effective date of the permit. b. The LPCP shall be implemented in accordance with the following schedule and contain the following elements: Number LPCP Component and Milestones Completion Date 1 Legal Analysis 2 years after permit effective date 2 Funding source assessment 3 years after permit effective date 3 Define LPCP scope (LPCP Area) 4 years after permit effective date 4 Calculate Baseline Phosphorus, Allowable 4 years after permit Phosphorus Load and Phosphorus Reduction effective date Requirement Page 20 of 61 MA MS4 General Permit Appendix F 5 Description of planned nonstructural and 5 years after permit structural controls effective date 6 Description of Operation and Maintenance 5 years after permit O&M Program effective date 7 Implementation schedule 5 years after permit effective date 8 Cost and Funding Source Assessment 5 years after permit effective date 9 Complete written LPCP 5 years after permit effective date 10 Full implementation of nonstructural 6 years after permit controls. effective date 11 Performance Evaluation. 6 and 7 years after permit effective date 12 1. Performance Evaluation. 8 years after permit 2. Full implementation of all structural effective date controls used to demonstrate that the total phosphorus export rate (Peep) from the LPCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(Parro,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.80 Pex < Pallow + (PRR X 0.80) 13 Performance Evaluation 9 years after permit effective date 14 1. Performance Evaluation. 10years after permit 2. Update LPCP effective date 3. Full implementation of all structural controls used to demonstrate that the total phosphorus export rate (Peep) from the LPCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(PQllo,v) plus the applicable Phosphorus Reduction Requirement (PRR) multiplied by 0.60 Pexp < Pallow + (PRR X 0.60) OR that the permittee has reduced their phosphorus export rate by 30kg/year (whichever is greater, unless full Phosphorus Reduction Requirement has been met) 15 Performance Evaluation 11 and 12 years after permit effective date 16 1. Performance Evaluation. 13years after permit 2. Full implementation of all structural effective date controls used to demonstrate that the total phosphorus export rate (Pexp) from the LPCP Area in mass/yr is equal to or less than the applicable Allowable Page 21 of 61 MA MS4 General Permit Appendix F Phosphorus Load(Pallow) plus the applicable Phosphorus Reduction Requirement (Pnn) multiplied by 0.30 Pex < Pallow + (Pxx X 0.30) 17 Performance Evaluation 14 years after permit effective date 18 1. Performance Evaluation. 15years after permit 2. Full implementation of all structural effective date controls used to demonstrate that the total phosphorus export rate (Pexp) from the LPCP Area in mass/yr is equal to or less than the applicable Allowable Phosphorus Load(Pallow) Rex < Pallow Table F-7: LPCP components and milestones c. Description of LPCP Components: Legal Anal- The permittee shall develop and implement an analysis that identifies existing regulatory mechanisms available to the MS4 such as by-laws and ordinances and describes any changes to these regulatory mechanisms that may be necessary to effectively implement the LPCP. This may include the creation or amendment of financial and regulatory authorities. The permittee shall adopt necessary regulatory changes by the end of the permit term. Scope of the LPCP (LPCP Area) - The permittee shall indicate the area in which the permittee plans to implement the LPCP, this area is known as the "LPCP Area". The permittee must choose one of the following: 1) to implement its LPCP in the entire area within its jurisdiction discharging to the impaired waterbody (for a municipality this would be the municipal boundary) or 2) to implement its LPCP in only the urbanized area portion of its jurisdiction discharging to the impaired waterbody. If the permittee chooses to implement the LPCP in its entire jurisdiction discharging to the impaired waterbody, the permittee may demonstrate compliance with the Phosphorus Reduction Requirement and Allowable Phosphorus Load requirements applicable to it through structural and non- structural controls on discharges that occur both inside and outside the urbanized area. If the permittee chooses to implement the LPCP in its urbanized area only discharging to the impaired waterbody, the permittee must demonstrate compliance with the Phosphorus Reduction Requirement and Allowable Phosphorus Load requirements applicable to it through structural and non-structural controls on discharges that occur within the urbanized area only. Calculate Baseline Phosphorus Load (Pb,,,,), Phosphorus Reduction Requirement (Pnn) and Allowable Phosphorus Load (Pallow) —Permittees shall calculate their numerical Allowable Phosphorus Load and Phosphorus Reduction Requirement in mass/yr by first estimating their Baseline Phosphorus Load in mass/yr from its LPCP Area consistent with the methodology in Attachment 1 to Appendix F, the baseline shall only be estimated using land use phosphorus export coefficients in Attachment 1 to Appendix F and not account for phosphorus reductions resulting from implemented structural BMPs completed to date. Table F-6 contains the Page 22 of 61 MA MS4 General Permit Appendix F percent phosphorus reduction required from urban stormwater consistent with the TMDL of each impaired waterbody. The permittee shall apply the applicable required percent reduction in Table F-6 to the calculated Baseline Phosphorus Load to obtain the permittee specific Allowable Phosphorus Load. The Allowable Phosphorus Load shall then be subtracted from the Baseline Phosphorus Load to obtain the permittee specific Phosphorus Reduction Requirement in mass/yr. Description of planned non-structural controls — The permittee shall describe the non-structural stormwater control measures to be implemented to support the achievement of the milestones in Table F-7. The description of non-structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions that are expected to result from their implementation. Annual phosphorus reduction from non-structural BMPs shall be calculated consistent with Attachment 2 to Appendix F. The permittee shall update the description of planned non-structural controls as needed to support the achievement of the milestones in Table F-7, including an update in the updated written LPCP 10 years after the permit effective date. Description of planned structural controls — The permittee shall develop a priority ranking of areas and infrastructure within the municipality for potential implementation of phosphorus control practices. The ranking shall be developed through the use of available screening and monitoring results collected during the permit term either by the permittee or another entity and the mapping required pursuant to part 2.3.4.6 of the Permit. The permittee shall also include in this prioritization a detailed assessment of site suitability for potential phosphorus control measures based on soil types and other factors. The permittee shall coordinate this activity with the requirements of part 2.3.6.8.b of the Permit. A description and the result of this priority ranking shall be included in the LPCP. The permittee shall describe the structural stormwater control measures necessary to support achievement of the milestones in Table F-7. The description of structural controls shall include the planned measures, the areas where the measures will be implemented, and the annual phosphorus reductions in units of mass/yr that are expected to result from their implementation. Structural measures to be implemented by a third party may be included in the LPCP. Annual phosphorus reduction from structural BMPs shall be calculated consistent with Attachment 3 to Appendix F. The permittee shall update the description of planned structural controls as needed to support the achievement of the milestones in Table F-7, including an update in the updated written LPCP 10 years after the permit effective date. Description of Operation and Maintenance (O&M,) Program for all planned and existing structural BMPs — The permittee shall establish an Operation and Maintenance Program for all structural BMPs being claimed for phosphorus reduction credit as part of Phase 1 and 2 of the PCP. This includes BMPs implemented to date as well as BMPs to be implemented during Phase 2 of the PCP. The Operation and Maintenance Program shall become part of the PCP and include: (1) inspection and maintenance schedule for each BMP according to BMP design or manufacturer specification and (2) program or department responsible for BMP maintenance. Page 23 of 61 MA MS4 General Permit Appendix F Implementation Schedule — An initial schedule for implementing the BMPs, including, as appropriate: funding, training, purchasing, construction, inspections, monitoring, O&M and other assessment and evaluation components of implementation. Implementation of planned BMPs must begin upon completion of the LPCP, and all non-structural BMPs shall be fully implemented within six years of the permit effective date. Where planned structural BMP retrofits or major drainage infrastructure projects are expected to take additional time to construct, the permittee shall within four years of the effective date of the permit have a schedule for completion of construction consistent with the reduction requirements in Table F-7. The permittee shall complete the implementation of its LPCP as soon as possible or at a minimum in accordance with the milestones set forth in Table F- 7. The implementation schedule shall be updated as needed to support the achievement of the milestones in Table F-7, including an update in the updated written LPCP 10 years after the permit effective date. Cost and funding source assessment — The permittee shall estimate the cost for implementing its LPCP and describe known and anticipated funding mechanisms. The permittee shall describe the steps it will take to implement its funding plan. This may include but is not limited to conceptual development, outreach to affected parties, and development of legal authorities. Complete written LPCP — The permittee must complete the written LPCP 5 years after permit effective date. The complete LPCP shall include item numbers 1-8 in Table F-7. The permittee shall make the LPCP available to the public for public comment during the LPCP development. EPA encourages the permittee to post the LPCP online to facilitate public involvement. The LPCP shall be updated as needed with an update 10 years after the permit effective date at a minimum to reflect changes in BMP implementation to support achievement of the phosphorus export milestones in Table F-7. The updated LPCP shall build upon the original LPCP and include additional or new BMPs the permittee will use to support the achievement of the milestones in Table F-7. Performance Evaluation — The permittee shall evaluate the effectiveness of the LPCP by tracking the phosphorus reductions achieved through implementation of structural and non-structural BMPs12 and tracking increases in phosphorus loading from the LPCP Area beginning six years after the effective date of the permit. Phosphorus reductions shall be calculated consistent with Attachment 2 (non- structural BMP performance), Attachment 3 (structural BMP performance) and Attachment 1 (reductions through land use change), to Appendix F for all BMPs implemented to date13. Phosphorus load increases resulting from development shall be calculated consistent with Attachment 1 to Appendix F. Phosphorus 12 In meeting its phosphorus reduction requirements a permittee may quantify phosphorus reductions by actions undertaken by another entity, except where those actions are credited to MassDOT or another permittee identified in Appendix F Table F-7 " Annual phosphorus reductions from structural BMPs installed in the LPCP Area prior to the effective date of this permit shall be calculated consistent with Attachment 3 to Appendix F. Phosphorus Reduction Credit for previously installed BMPs will only be given if the Permittee demonstrates that the BMP is performing up to design specifications and certifies that the BMP is properly maintained and inspected according to manufacturer design or specifications. This certification shall be part of the annual performance evaluation during the year credit is claimed for the previously installed BMP. Page 24 of 61 MA MS4 General Permit Appendix F 2. Reporting loading increases and reductions in units of mass/yr shall be added or subtracted from the calculated Baseline Phosphorus Load to estimate the yearly phosphorous export rate from the LPCP Area in mass/yr. The permittee shall also include all information required in part II.2 of this Appendix in each performance evaluation. Beginning 1 year after the permit effective date, the permittee shall include a progress report in each annual report on the planning and implementation of the LPCP. Beginning five (5) years after the permit effective date, the permittee shall include the following in each annual report submitted pursuant to part 4.4 of the Permit: a. All non-structural control measures implemented during the reporting year along with the phosphorus reduction in mass/yr (PNs,ed) calculated consistent with Attachment 2 to Appendix F b. Structural controls implemented during the reporting year and all previous years including: a. Location information of structural BMPs (GPS coordinates or street address) b. Phosphorus reduction from all structural BMPs implemented to date in mass/yr (Psred) calculated consistent with Attachment 3 to Appendix F c. Date of last completed maintenance for each Structural control c. Phosphorus load increases due to development over the previous reporting period and incurred to date (PDEu,,,c) calculated consistent with Attachment 1 to Appendix F. d. Estimated yearly phosphorus export rate (Pexp) from the LPCP Area calculated using Equation 2. Equation2 calculates the yearly phosphorus export rate by subtracting yearly phosphorus reductions through implemented nonstructural controls and structural controls to date from the Baseline Phosphorus Load and adding loading increases incurred through development to date. This equation shall be used to demonstrate compliance with the phosphorus reduction milestones required as part of each phase of the LPCP. P mass P mass — P mass + P mass + P mass exp ( yr ) base ( yr ) Sred ( yr ) NSred ( yr ) DEVinc ( yr ) Equation 2. Equation used to calculate yearly phosphorus export rate from the chosen LPCP Area. Pexp Current phosphorus export rate from the LPCP Area in mass/year. Passe baseline phosphorus export rate from LPCP Area in mass/year. Psped= yearly phosphorus reduction from implemented structural controls in the LPCP Area in mass/year. PNs,.ed= yearly phosphorus reduction from implemented non-structural controls in the LPCP Area in mass/year. Area in mass/year. PDEVinc yearly phosphorus increase resulting from development since the year baseline loading was calculated in the LPCP Area in mass/year. e. Certification that all structural BMPs are being inspected and maintained according to the O&M program specified as part of the PCP. The certification statement shall be: I certify under penalty of law that all source control and treatment Best Management Practices being claimed for phosphorus reduction credit have been inspected, maintained and repaired in accordance with manufacturer or design specification. I certify that, to the best of my knowledge, all Best Management Page 25 of 61 MA MS4 General Permit Appendix F Practices being claimed for a phosphorus reduction credit are performing as originally designed. f. Certification that all municipally owned and maintained turf grass areas are being managed in accordance with Massachusetts Regulation 331 CMR 31 pertaining to proper use of fertilizers on turf grasses (see http://www.mass.gov/courts/docs/lawlib/300-399cmr/330cmr3l.pdf ). At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part A.II.1. as follows: a. The permittee is relieved of its additional requirements as of the date when the following conditions are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of phosphorus are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any additional remaining requirements of Appendix F part A.11.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part A.11.1 to date to reduce phosphorus in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part A.I.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications, and the reporting requirements of Appendix F part A.II.2. remain in place. Page 26 of 61 MA MS4 General Permit Appendix F III. Bacteria and Pathogen TMDL Requirements There are currently approved 16 approved bacteria (fecal coliform bacteria) or mixed pathogen (fecal coliform, E. coli, and/or enterococcus bacteria) TMDLs for certain waterbodies in Massachusetts.14 Any permittee (traditional or non-traditional) that discharges to a waterbody segment in Table F-8 is subject to the requirements of this part. 1. Traditional and non-traditional MS4s operating in the municipalities listed in Table F-8 and/or that discharge to a waterbody listed on Table F-8 shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.3. Public Education: The permittee shall supplement its Residential program with an annual message encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee or its agents shall disseminate educational materials to dog owners at the time of issuance or renewal of a dog license, or other appropriate time. Education materials shall describe the detrimental impacts of improper management of pet waste, requirements for waste collection and disposal, and penalties for non-compliance. The permittee shall also provide information to owners of septic systems about proper maintenance in any catchment that discharges to a water body impaired for bacteria or pathogens. All public education messages can be combined with requirements of Appendix H part I, II and III as well as Appendix F part A.IV, AN, B.I, B.II and B.III where appropriate. 2. part 2.3.4 Illicit Discharge: Catchments draining to any waterbody impaired for bacteria or pathogens shall be designated either Problem Catchments or HIGH priority in implementation of the IDDE program. Primary Municipality Segment ID Waterbody Name Indicator Organism Abington MA62-09 Beaver Brook Escherichia Coli (E. Coli) Abington MA62-33 Shumatuscacant River Escherichia Coli (E. Coli) Acushnet MA95-31 Acushnet River Escherichia Coli (E. Coli) Acushnet MA95-32 Acushnet River Escherichia Coli (E. Coli) Acushnet MA95-33 Acushnet River Fecal Coliform " Final bacteria or pathogen TMDLs can be found here: http://www.mass. gov/eea/agencies/massdep/water/watersheds/total-maximum-daily-loads-tmdls.html Page 27 of 61 MA MS4 General Permit Appendix F Andover MA83-04 Rogers Brook Fecal Coliform Andover MA83-15 Unnamed Tributary Fecal Coliform Andover MA83-18 Shawsheen River Fecal Coliform Andover MA83-19 Shawsheen River Fecal Coliform Avon MA62-07 Trout Brook Escherichia Coli (E. Coli) Barnstable MA96-01 Barnstable Harbor Fecal Coliform Barnstable MA96-02 Bumps River Fecal Coliform Barnstable MA96-04 Centerville River Fecal Coliform Barnstable MA96-05 Hyannis Harbor Fecal Coliform Barnstable MA96-06 Maraspin Creek Fecal Coliform Barnstable MA96-07 Prince Cove Fecal Coliform Barnstable MA96-08 Shoestring Bay Fecal Coliform Barnstable MA96-36 Lewis Bay Fecal Coliform Barnstable MA96-37 Mill Creek Fecal Coliform Barnstable MA96-63 Cotuit Bay Fecal Coliform Barnstable MA96-64 Seapuit River Fecal Coliform Barnstable MA96-66 North Bay Fecal Coliform Barnstable MA96-81 Snows Creek Fecal Coliform Barnstable MA96-82 Hyannis Inner Harbor Fecal Coliform Barnstable MA96-92 Santuit River Fecal Coliform Barnstable MA96-93 Halls Creek Fecal Coliform Barnstable MA96-94 Stewarts Creek Fecal Coliform Bedford MA83-01 Shawsheen River Fecal Coliform Bedford MA83-05 Elm Brook Fecal Coliform Bedford MA83-06 Vine Brook Fecal Coliform Bedford MA83-08 Shawsheen River Fecal Coliform Bedford MA83-10 Kiln Brook Fecal Coliform Bedford MA83-14 Spring Brook Fecal Coliform Bedford MA83-17 Shawsheen River Fecal Coliform Bellingham MA72-03 Charles River Pathogens Bellingham MA72-04 Charles River Pathogens Belmont MA72-28 Beaver Brook Pathogens Berkley MA62-02 Taunton River Fecal Coliform Berkley MA62-03 Taunton River Fecal Coliform Berkley MA62-20 Assonet River Fecal Coliform Beverly MA93-08 Bass River Fecal Coliform Beverly MA93-09 Danvers River Fecal Coliform Beverly MA93-20 Beverly Harbor Fecal Coliform Beverly MA93-25 Salem Sound Fecal Coliform Billerica MA83-14 Spring Brook Fecal Coliform Billerica MA83-17 Shawsheen River Fecal Coliform Page 28 of 61 MA MS4 General Permit Appendix F Billerica MA83-18 Shawsheen River Fecal Coliform Bourne MA95-01 Buttermilk Bay Fecal Coliform Bourne MA95-14 Cape Cod Canal Fecal Coliform Bourne MA95-15 Phinneys Harbor Fecal Coliform Bourne MA95-16 Pocasset River Fecal Coliform Bourne MA95-17 Pocasset Harbor Fecal Coliform Bourne MA95-18 Red Brook Harbor Fecal Coliform Bourne MA95-47 Back River Fecal Coliform Bourne MA95-48 Eel Pond Fecal Coliform Brewster MA96-09 Quivett Creek Fecal Coliform Brewster MA96-27 Namskaket Creek Fecal Coliform Bridgewater MA62-32 Matfield River Escherichia Coli (E. Coli) Brockton MA62-05 Salisbury Plain River Escherichia Coli (E. Coli) Brockton MA62-06 Salisbury Plain River Escherichia Coli E. Coli Brockton MA62-07 Trout Brook Escherichia Coli (E. Coli) Brockton MA62-08 Salisbury Brook Escherichia Coli (E. Coli) Brockton MA62-09 Beaver Brook Escherichia Coli (E. Coli) Brookline MA72-11 Muddy River Pathogens Burlington MA83-06 Vine Brook Fecal Coliform Burlington MA83-11 Long Meadow Brook Fecal Coliform Burlington MA83-13 Sandy Brook Fecal Coliform Cambridge MA72-36 Charles River Pathogens Cambridge MA72-38 Charles River Pathogens Canton MA73-01 Neponset River Fecal Coliform Canton MA73-01 Neponset River Escherichia Coli (E. Coli) Canton MA73-02 Neponset River Fecal Coliform Canton MA73-05 East Branch Fecal Coliform Canton MA73-20 Beaver Meadow Brook Fecal Coliform Canton MA73-22 Pequid Brook Fecal Coliform Canton MA73-25 Pecunit Brook Escherichia Coli (E. Coli) Canton MA73-27 Ponkapog Brook Fecal Coliform Chatham MA96-11 Stage Harbor Fecal Coliform Chatham MA96-41 Mill Creek Fecal Coliform Chatham MA96-42 Taylors Pond Fecal Coliform Chatham MA96-43 Harding Beach Pond Fecal Coliform Chatham MA96-44 Bucks Creek Fecal Coliform Chatham MA96-45 Oster Pond Fecal Coliform Chatham MA96-46 Oyster Pond River Fecal Coliform Chatham MA96-49 Frost Fish Creek Pathogens Chatham MA96-50 Ryder Cove Fecal Coliform Chatham MA96-51 Muddy Creek Pathogens Page 29 of 61 MA MS4 General Permit Appendix F Chatham MA96-79 Cockle Cove Creek Fecal Coliform Chatham MA96-79 Cockle Cove Creek Enterococcus Bacteria Cohasset MA94-01 Cohasset Harbor Fecal Coliform Cohasset MA94-19 The Gulf Fecal Coliform Cohasset MA94-20 Little Harbor Fecal Coliform Cohasset MA94-32 Cohasset Cove Fecal Coliform Concord MA83-05 Elm Brook Fecal Coliform Danvers MA93-01 Waters River Fecal Coliform Danvers MA93-02 Crane Brook Escherichia Coli E. Coli Danvers MA93-04 Porter River Fecal Coliform Danvers MA93-09 Danvers River Fecal Coliform Danvers MA93-36 Frost Fish Brook Escherichia Coli (E. Coli) Danvers MA93-41 Crane River Fecal Coliform Dartmouth MA95-13 Buttonwood Brook Escherichia Coli E. Coli Dartmouth MA95-34 Slocums River Fecal Coliform Dartmouth MA95-38 Clarks Cove Fecal Coliform Dartmouth MA95-39 Apponagansett Bay Fecal Coliform Dartmouth MA95-40 East Branch Westport River Escherichia Coli (E. Coli) Dartmouth MA95-62 Buzzards Bay Fecal Coliform Dedham MA72-07 Charles River Pathogens Dedham MA72-21 Rock Meadow Brook Pathogens Dedham MA73-02 Ne onset River Fecal Coliform Dennis MA96-09 Quivett Creek Fecal Coliform Dennis MA96-12 Bass River Fecal Coliform Dennis MA96-13 Sesuit Creek Fecal Coliform Dennis MA96-14 Swan Pond River Fecal Coliform Dennis MA96-35 Chase Garden Creek Fecal Coliform Dighton MA62-02 Taunton River Fecal Coliform Dighton MA62-03 Taunton River Fecal Coliform Dighton MA62-50 Broad Cove Fecal Coliform Dighton MA62-51 Muddy Cove Brook Fecal Coliform Dighton MA62-55 Segreganset River Fecal Coliform Dighton MA62-56 Three Mile River Escherichia Coli (E. Coli) Dighton MA62-57 Three Mile River Fecal Coliform Dover MA72-05 Charles River Pathogens Dover MA72-06 Charles River Pathogens Duxbu MA94-15 Duxbury Bay Fecal Coliform Duxbury MA94-30 Bluefish River Fecal Coliform East Bridgewater MA62-06 Salisbury Plain River Escherichia Coli (E. Coli) East Bridgewater MA62-09 Beaver Brook Escherichia Coli (E. Coli) East Bridgewater MA62-32 Matfield River Escherichia Coli (E. Coli) Page 30 of 61 MA MS4 General Permit Appendix F East Bridgewater MA62-33 Shumatuscacant River Escherichia Coli (E. Coli) East Bridgewater MA62-38 Meadow Brook Escherichia Coli E. Coli Eastham MA96-15 Boat Meadow River Fecal Coliform Eastham MA96-16 Rock Harbor Creek Fecal Coliform Eastham MA96-34 Wellfleet Harbor Fecal Coliform Eastham MA96-68 Town Cove Fecal Coliform Essex MA93-11 Essex River Fecal Coliform Essex MA93-16 Essex Bay Fecal Coliform Essex MA93-45 Alewife Brook Escherichia Coli E. Coli Essex MA93-46 Alewife Brook Fecal Coliform Everett MA93-51 Unnamed Tributary Enterococcus Bacteria Fairhaven MA95-33 Acushnet River Fecal Coliform Fairhaven MA95-42 New Bedford Inner Harbor Fecal Coliform Fairhaven MA95-62 Buzzards Bay Fecal Coliform Fairhaven MA95-63 Outer New Bedford Harbor Fecal Coliform Fairhaven MA95-64 Little Bay Fecal Coliform Fairhaven MA95-65 Nasketucket Bay Fecal Coliform Fall River MA61-06 Mount Hope Bay Fecal Coliform Fall River MA62-04 Taunton River Fecal Coliform Falmouth MA95-20 Wild Harbor Fecal Coliform Falmouth MA95-21 Herring Brook Fecal Coliform Falmouth MA95-22 West Falmouth Harbor Fecal Coliform Falmouth MA95-23 Great Sippewisset Creek Fecal Coliform Falmouth MA95-24 Little Sippewisset Marsh Fecal Coliform Falmouth MA95-25 Quissett Harbor Fecal Coliform Falmouth MA95-46 Harbor Head Fecal Coliform Falmouth MA96-17 Falmouth Inner Harbor Fecal Coliform Falmouth MA96-18 Great Harbor Fecal Coliform Falmouth MA96-19 Little Harbor Fecal Coliform Falmouth MA96-20 Quashnet River Fecal Coliform Falmouth MA96-21 Waquoit Bay Fecal Coliform Falmouth MA96-53 Perch Pond Fecal Coliform Falmouth MA96-54 Great Pond Fecal Coliform Falmouth MA96-55 Green Pond Fecal Coliform Falmouth MA96-56 Little Pond Fecal Coliform Falmouth MA96-57 Bournes Pond Fecal Coliform Falmouth MA96-58 Hamblin Pond Fecal Coliform Falmouth MA96-62 Oyster Pond Fecal Coliform Foxborough MA62-39 Rumford River Escherichia Coli (E. Coli Foxborough MA62-47 Wading River Escherichia Coli (E. Coli) Foxborough MA73-01 Neponset River Fecal Coliform Page 31 of 61 MA MS4 General Permit Appendix F Foxborough MA73-01 Neponset River Escherichia Coli (E. Coli) Franklin MA72-04 Charles River Pathogens Freetown MA62-04 Taunton River Fecal Coliform Freetown MA62-20 Assonet River Fecal Coliform Gloucester MA93-12 Annisquam River Fecal Coliform Gloucester MA93-16 Essex Bay Fecal Coliform Gloucester MA93-18 Gloucester Harbor Fecal Coliform Gloucester MA93-28 Mill River Fecal Coliform Hanover MA94-05 North River Fecal Coliform Hanover MA94-21 Drinkwater River Escherichia Coli (E. Coli) Hanover MA94-24 Iron Mine Brook Escherichia Coli (E. Coli) Hanover MA94-27 Third Herring Brook Escherichia Coli (E. Coli) Hanson MA62-33 Shumatuscacant River Escherichia Coli (E. Coli) Harwich MA96-22 Herring River Fecal Coliform Harwich MA96-23 Saquatucket Harbor Fecal Coliform Harwich MA96-51 Muddy Creek Pathogens Holliston MA72-16 Bo astow Brook Pathogens Hopedale MA72-03 Charles River Pathogens Hopkinton MA72-01 Charles River Pathogens Ipswich MA93-16 Essex Bay Fecal Coliform Kingston MA94-14 Jones River Fecal Coliform Kingston MA94-15 Duxbury Bay Fecal Coliform Lawrence MA83-19 Shawsheen River Fecal Coliform Lexington MA72-28 Beaver Brook Pathogens Lexington MA83-06 Vine Brook Fecal Coliform Lexington MA83-10 Kiln Brook Fecal Coliform Lincoln MA83-05 Elm Brook Fecal Coliform Lincoln MA83-08 Shawsheen River Fecal Coliform Lynn MA93-24 Nahant Bay Fecal Coliform Lynn MA93-44 Saugus River Fecal Coliform Lynn MA93-52 Lynn Harbor Fecal Coliform Lynnfield MA93-30 Beaverdam Brook Escherichia Coli (E. Coli) Lynnfield MA93-32 Hawkes Brook Escherichia Coli (E. Coli) Lynnfield MA93-34 Saugus River Escherichia Coli (E. Coli) Lynnfield MA93-35 Saugus River Escherichia Coli (E. Coli) Malden MA93-51 Unnamed Tributary Enterococcus Bacteria Manchester MA93-19 Manchester Harbor Fecal Coliform Manchester MA93-25 Salem Sound Fecal Coliform Manchester MA93-29 Cat Brook Escherichia Coli (E. Coli Manchester MA93-47 Causeway Brook Escherichia Coll (E. Coli) Mansfield I MA62-39 Rumford River Escherichia Coli (E. Coli) Page 32 of 61 MA MS4 General Permit Appendix F Mansfield MA62-47 Wading River Escherichia Coli (E. Coli) Mansfield MA62-49 Wading River Escherichia Coli E. Coli Marblehead MA93-21 Salem Harbor Fecal Coliform Marblehead MA93-22 Marblehead Harbor Fecal Coliform Marblehead MA93-25 Salem Sound Fecal Coliform Marion MA95-05 Weweantic River Fecal Coliform Marion MA95-07 Sippican River Fecal Coliform Marion MA95-08 Sippican Harbor Fecal Coliform Marion MA95-09 Aucoot Cove Fecal Coliform Marion MA95-56 Hammett Cove Fecal Coliform Marshfield MA94-05 North River Fecal Coliform Marshfield MA94-06 North River Fecal Coliform Marshfield MA94-09 South River Fecal Coliform Marshfield MA94-11 Green Harbor Fecal Coliform Mashpee MA96-08 Shoestring Bay Fecal Coliform Mashpee MA96-21 Waquoit Bay Fecal Coliform Mashpee MA96-24 Mashpee River Fecal Coliform Mashpee MA96-39 Popponesset Creek Fecal Coliform Mashpee MA96-58 Hamblin Pond Fecal Coliform Mashpee MA96-61 Little River Fecal Coliform Mashpee MA96-92 Santuit River Fecal Coliform Mattapoisett MA95-09 Aucoot Cove Fecal Coliform Mattapoisett MA95-10 Hiller Cove Fecal Coliform Mattapoisett MA95-35 Mattapoisett Harbor Fecal Coliform Mattapoisett MA95-60 Mattapoisett River Fecal Coliform Mattapoisett MA95-61 Eel Pond Fecal Coliform Mattapoisett MA95-65 Nasketucket Bay Fecal Coliform Medfield MA72-05 Charles River Pathogens Medfield MA72-10 Stop River Pathogens Medfield MA73-09 Mine Brook Fecal Coliform Medway MA72-04 Charles River Pathogens Medway MA72-05 Charles River Pathogens Melrose MA93-48 Bennetts Pond Brook Escherichia Coli (E. Coli) Mendon MA72-03 Charles River Pathogens Milford MA72-01 Charles River Pathogens Millis MA72-05 Charles River Pathogens Millis MA72-16 Bo astow Brook Pathogens Milton MA73-02 Neponset River Fecal Coliform Milton MA73-03 Neponset River Fecal Coliform Milton MA73-04 Neponset River Fecal Coliform Milton MA73-26 Unquity Brook Fecal Coliform Page 33 of 61 MA MS4 General Permit Appendix F Milton MA73-29 Pine Tree Brook Fecal Coliform Milton MA73-30 Gulliver Creek Fecal Coliform Nahant MA93-24 Nahant Bay Fecal Coliform Nahant MA93-52 Lynn Harbor Fecal Coliform Nahant MA93-53 Lynn Harbor Fecal Coliform Natick MA72-05 Charles River Pathogens Natick MA72-06 Charles River Pathogens Needham MA72-06 Charles River Pathogens Needham MA72-07 Charles River Pathogens Needham MA72-18 Fuller Brook Pathogens Needham MA72-21 Rock Meadow Brook Pathogens Needham MA72-25 Rosemary Brook Pathogens New Bedford MA95-13 Buttonwood Brook Escherichia Coli (E. Coli) New Bedford MA95-33 Acushnet River Fecal Coliform New Bedford MA95-38 Clarks Cove Fecal Coliform New Bedford MA95-42 New Bedford Inner Harbor Fecal Coliform New Bedford MA95-63 Outer New Bedford Harbor Fecal Coliform Newton MA72-07 Charles River Pathogens Newton MA72-23 Sawmill Brook Pathogens Newton MA72-24 South Meadow Brook Pathogens Newton MA72-29 Cheese Cake Brook Pathogens Newton MA72-36 Charles River Pathogens Norfolk MA72-05 Charles River Pathogens Norfolk MA72-10 Stop River Pathogens North Andover MA83-19 Shawsheen River Fecal Coliform Norton MA62-49 Wading River Escherichia Coli (E. Coli) Norton MA62-56 Three Mile River Escherichia Coli (E. Coli) Norwell MA94-05 North River Fecal Coliform Norwell MA94-27 Third Herring Brook Escherichia Coli (E. Coli) Norwell MA94-31 Second Herring Brook Fecal Coliform Norwood MA73-01 Neponset River Fecal Coliform Norwood MA73-01 Neponset River Escherichia Coli (E. Coli) Norwood MA73-02 Neponset River Fecal Coliform Norwood MA73-15 Germany Brook Fecal Coliform Norwood MA73-16 Hawes Brook Fecal Coliform Norwood MA73-17 Traphole Brook Fecal Coliform Norwood MA73-24 Purgatory Brook Fecal Coliform Norwood MA73-33 Unnamed Tributary Escherichia Coli (E. Coli) Orleans MA96-16 Rock Harbor Creek Fecal Coliform Orleans MA96-26 Little Namskaket Creek Fecal Coliform Orleans MA96-27 Namskaket Creek Fecal Coliform Page 34 of 61 MA MS4 General Permit Appendix F Orleans MA96-68 Town Cove Fecal Coliform Orleans MA96-72 Paw Wah Pond Fecal Coliform Orleans MA96-73 Pochet Neck Fecal Coliform Orleans MA96-76 The River Fecal Coliform Orleans MA96-78 Little Pleasant Bay Fecal Coliform Peabody MA93-01 Waters River Fecal Coliform Peabody MA93-05 Goldthwait Brook Escherichia Coli E. Coli Peabody MA93-39 Proctor Brook Escherichia Coli (E. Coli) Pembroke MA94-05 North River Fecal Coliform Plymouth MA94-15 Duxbury Bay Fecal Coliform Plymouth MA94-16 Plymouth Harbor Fecal Coliform Plymouth MA94-34 Ellisville Harbor Fecal Coliform Raynham MA62-02 Taunton River Fecal Coliform Rehoboth MA53-03 Palmer River Pathogens Rehoboth MA53-04 Palmer River Pathogens Rehoboth MA53-05 Palmer River Pathogens Rehoboth MA53-07 Palmer River - West Branch Pathogens Rehoboth MA53-08 Palmer River - East Branch Pathogens Rehoboth MA53-09 Rumney Marsh Brook Pathogens Rehoboth MA53-10 Beaver Dam Brook Pathogens Rehoboth MA53-11 Bad Luck Brook Pathogens Rehoboth MA53-12 Fullers Brook Pathogens Rehoboth MA53-13 Clear Run Brook Pathogens Rehoboth MA53-14 Torrey Creek Pathogens Rehoboth MA53-15 Old Swamp Brook Pathogens Rehoboth MA53-16 Rocky Run Pathogens Revere MA93-15 Pines River Fecal Coliform Revere MA93-44 Saugus River Fecal Coliform Revere MA93-51 Unnamed Tributary Enterococcus Bacteria Revere MA93-52 Lynn Harbor Fecal Coliform Revere MA93-53 Lynn Harbor Fecal Coliform Rockland MA94-03 French Stream Escherichia Coli (E. Coli) Rockport MA93-17 Rockport Harbor Fecal Coliform Salem MA93-09 Danvers River Fecal Coliform Salem MA93-20 Beverly Harbor Fecal Coliform Salem MA93-21 Salem Harbor Fecal Coliform Salem MA93-25 Salem Sound Fecal Coliform Salem MA93-39 Proctor Brook Escherichia Coli (E. Coli) Salem MA93-40 Proctor Brook Enterococcus Bacteria Salem MA93-42 North River Fecal Coliform Sandwich MA95-14 I Cape Cod Canal Fecal Coliform Page 35 of 61 MA MS4 General Permit Appendix F Sandwich MA96-30 Scorton Creek Fecal Coliform Sandwich MA96-84 Old Harbor Creek Fecal Coliform Sandwich MA96-85 Mill Creek Fecal Coliform Sandwich MA96-86 Dock Creek Fecal Coliform Sandwich MA96-87 Springhill Creek Fecal Coliform Saugus MA93-15 Pines River Fecal Coliform Saugus MA93-33 Hawkes Brook Escherichia Coli E. Coli Saugus MA93-35 Saugus River Escherichia Coli (E. Coli) Saugus MA93-43 Saugus River Fecal Coliform Saugus MA93-44 Saugus River Fecal Coliform Saugus MA93-48 Bennetts Pond Brook Escherichia Coli (E. Coli) Saugus MA93-49 Shute Brook Fecal Coliform Saugus MA93-50 Shute Brook Escherichia Coli (E. Coli) Scituate MA94-01 Cohasset Harbor Fecal Coliform Scituate MA94-02 Scituate Harbor Fecal Coliform Scituate MA94-05 North River Fecal Coliform Scituate MA94-06 North River Fecal Coliform Scituate MA94-07 Herring River Fecal Coliform Scituate MA94-09 South River Fecal Coliform Scituate MA94-19 The Gulf Fecal Coliform Scituate MA94-32 Cohasset Cove Fecal Coliform Scituate MA94-33 Mus uashcut Pond Fecal Coliform Seekonk MA53-01 Runnins River Fecal Coliform Seekonk MA53-12 Fullers Brook Pathogens Seekonk MA53-13 Clear Run Brook Pathogens Seekonk MA53-14 Torrey Creek Pathogens Sharon MA62-39 Rumford River Escherichia Coli (E. Coli) Sharon MA73-17 Traphole Brook Fecal Coliform Sharon MA73-31 Unnamed Tributary Fecal Coliform Sherborn MA72-05 Charles River Pathogens Somerset MA61-01 Lee River Fecal Coliform Somerset MA61-02 Lee River Fecal Coliform Somerset MA61-06 Mount Hope Bay Fecal Coliform Somerset MA62-03 Taunton River Fecal Coliform Somerset MA62-04 Taunton River Fecal Coliform Somerset MA62-50 Broad Cove Fecal Coliform Stoughton MA73-20 Beaver Meadow Brook Fecal Coliform Stoughton MA73-32 Unnamed Tributary Escherichia Coli (E. Coli) Swampscott MA93-24 Nahant Bay Fecal Coliform Swansea MA53-03 Palmer River Pathogens Swansea MA53-06 Warren River Pond Fecal Coliform Page 36 of 61 MA MS4 General Permit Appendix F Swansea MA53-16 Rocky Run Pathogens Swansea MA61-01 Lee River Fecal Coliform Swansea MA61-02 Lee River Fecal Coliform Swansea MA61-04 Cole River Fecal Coliform Swansea MA61-07 Mount Hope Bay Fecal Coliform Swansea MA61-08 Kickemuit River Pathogens Taunton MA62-02 Taunton River Fecal Coliform Taunton MA62-56 Three Mile River Escherichia Coli (E. Coli) Taunton MA62-57 Three Mile River Fecal Coliform Tewksbury MA83-07 Strong Water Brook Fecal Coliform Tewksbury MA83-15 Unnamed Tributary Fecal Coliform Tewksbury MA83-18 Shawsheen River Fecal Coliform Wakefield MA93-31 Mill River Escherichia Coli (E. Coli) Wakefield MA93-34 Saugus River Escherichia Coli E. Coli Wakefield MA93-35 Saugus River Escherichia Coli (E. Coli) Walpole MA72-10 Stop River Pathogens Walpole MA73-01 Ne onset River Fecal Coliform Walpole MA73-01 Neponset River Escherichia Coli (E. Coli) Walpole MA73-06 School Meadow Brook Fecal Coliform Walpole MA73-09 Mine Brook Fecal Coliform Walpole MA73-17 Tra hole Brook Fecal Coliform Waltham MA72-07 Charles River Pathogens Waltham MA72-28 Beaver Brook Pathogens Wareham MA95-01 Buttermilk Bay Fecal Coliform Wareham MA95-02 Onset Bay Fecal Coliform Wareham MA95-03 Wareham River Fecal Coliform Wareham MA95-05 Weweantic River Fecal Coliform Wareham MA95-07 Sippican River Fecal Coliform Wareham MA95-29 Agawam River Fecal Coliform Wareham MA95-49 Broad Marsh River Fecal Coliform Wareham MA95-50 Wankinco River Fecal Coliform Wareham MA95-51 Crooked River Fecal Coliform Wareham MA95-52 Cedar Island Creek Fecal Coliform Wareham MA95-53 Beaverdam Creek Fecal Coliform Watertown MA72-07 Charles River Pathogens Watertown MA72-30 Unnamed Tributary Pathogens Watertown MA72-32 Unnamed Tributary Pathogens Watertown MA72-36 Charles River Pathogens Wellesley MA72-06 Charles River Pathogens Wellesley MA72-07 Charles River Pathogens Wellesley MA72-18 Fuller Brook Pathogens Page 37 of 61 MA MS4 General Permit Appendix F Wellesley MA72-25 Rosemary Brook Pathogens Wellfleet MA96-32 Duck Creek Fecal Coliform Wellfleet MA96-33 Herring River Fecal Coliform Wellfleet MA96-34 Wellfleet Harbor Fecal Coliform West Bridgewater MA62-06 Salisbury Plain River Escherichia Coli (E. Coli) Weston MA72-07 Charles River Pathogens Westport MA95-37 West Branch Westport River Fecal Coliform Westport MA95-40 East Branch Westport River Escherichia Coli (E. Coli) Westport MA95-41 East Branch Westport River Fecal Coliform Westport MA95-44 Snell Creek Escherichia Coli (E. Coli) Westport MA95-45 Snell Creek Escherichia Coli (E. Coli) Westport MA95-54 Westport River Fecal Coliform Westport MA95-58 Bread And Cheese Brook Escherichia Coli (E. Coli) Westport MA95-59 Snell Creek Fecal Coliform Westwood MA72-21 Rock Meadow Brook Pathogens Westwood MA73-02 Neponset River Fecal Coliform Westwood MA73-15 Germany Brook Fecal Coliform Westwood MA73-24 Purgatory Brook Fecal Coliform Westwood MA73-25 Pecunit Brook Escherichia Coli E. Coli Westwood MA73-27 Ponkapog Brook Fecal Coliform Whitman MA62-09 Beaver Brook Escherichia Coli E. Coli Whitman MA62-33 Shumatuscacant River Escherichia Coli (E. Coli) Whitman MA62-38 Meadow Brook Escherichia Coli (E. Coli) Wilmington MA83-18 Shawsheen River Fecal Coliform WinthropMA93-53 Lynn Harbor Fecal Coliform Yarmouth MA96-12 Bass River Fecal Coliform Yarmouth MA96-35 Chase Garden Creek Fecal Coliform Yarmouth MA96-36 Lewis Bay Fecal Coliform Yarmouth MA96-37 Mill Creek Fecal Coliform Yarmouth MA96-38 Parkers River Fecal Coliform Yarmouth MA96-80 Mill Creek Fecal Coliform Yarmouth MA96-82 Hyannis Inner Harbor Fecal Coliform Cable F-8: Bacteria or pathogens impaired waterbody names and segment IDs along with primary municipality and indicator organism identified by the applicable TMDL. The term primary municipality indicates the municipality in which the majority of the segment is located, but does not necessarily indicate each municipality that has regulated discharges to the waterbody segment. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part A.III.1. as follows: a. The permittee is relieved of additional requirements as of the date when the following conditions are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable to the receiving water Page 38 of 61 MA MS4 General Permit Appendix F that indicates that no additional stormwater controls for bacteria/pathogens are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any additional remaining requirements of Appendix F part A.III.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part A.III.1 to date to reduce bacteria/pathogens in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part A.III.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 39 of 61 MA MS4 General Permit Appendix F IV. Cape Cod Nitrogen TMDL Requirements There are 19 approved TMDLs for nitrogen for various watersheds, ponds and bays on Cape Cod." The following measuress are needed to ensure that current nitrogen loads from MS4 stormwater discharged into the impaired waterbodies do not increase. 1. The operators of traditional and non-traditional MS4s located in municipalities listed in Table F-9 or any other MS4 (traditional and non-traditional) that discharges to any waterbody listed in Table F-9 or their tributaries shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (April/May) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow -release fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the Fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of nitrogen to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part I,11 and III as well as Appendix F part A.111, A.V, B.1, B.11 and B.111 where appropriate. 2. part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for nitrogen removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs to reduce nitrogen discharges. 15 Final nitrogen TMDLs for Cape Cod can be found here: http://www.mass. gov/eea/agencies/massdep/water/watersheds/total-maximum-daily-loads-tmdls.html Page 40 of 61 MA MS4 General Permit Appendix F part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: establish requirements for use of slow release fertilizers on permittee owned property currently using fertilizer, in addition to reducing and managing fertilizer use as provided in in part 2.3.7.1; establish procedures to properly manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increased street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a minimum of two (2) times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1— Dec 1; following leaf fall). Municipality Waterbody Name Barnstable Centerville River Barnstable Popponesset Bay Barnstable Shoestring Bay Barnstable Cotuit Bay Barnstable North Bay Barnstable Prince Cove Barnstable West Bay Barnstable Hyannis Inner Harbor Barnstable Lewis Bay Bourne Phinneys Harbor Chatham Crows Pond Chatham Bucks Creek Chatham Harding Beach Pond Chatham Mill Creek Chatham Mill Pond Chatham Oyster Pond Chatham Oyster Pond River Chatham Stage Harbor Chatham Taylors Pond Chatham Frost Fish Creek Chatham Ryder Cove Falmouth Bournes Pond Falmouth Great Pond Falmouth Green Pond Falmouth Perch Pond Falmouth Little Pond Falmouth Oyster Pond Falmouth Quashnet River Falmouth Inner West Falmouth Harbor Page 41 of 61 MA MS4 General Permit Appendix F Municipality Waterbody Name Falmouth West Falmouth Harbor Falmouth Snug Harbor Falmouth Harbor Head Harwich Muddy Creek - Lower Harwich Muddy Creek - Upper Harwich Round Cove Mashpee Mashpee River Mashpee Great River Mashpee Hamblin Pond Mashpee Jehu Pond Mashpee Little River Orleans Are s Pond Orleans Little Pleasant Bay Orleans Namequoit River Orleans Paw Wah Pond Orleans Pleasant Bay Orleans Pochet Neck Orleans Quanset Pond Yarmouth Mill Creek Yarmouth Hyannis Inner Harbor Yarmouth Lewis Bay Table F-9: Waterbodies subject to a Cape Cod nitrogen TMDL and the primary municipalities 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part A.IV.1. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of nitrogen are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part A.IV.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part A.IV.1 to date to reduce nitrogen in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part A.IV.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing Page 42 of 61 MA MS4 General Permit Appendix F implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 43 of 61 MA MS4 General Permit Appendix F V. Assabet River Phosphorus TMDL Requirements On September 23, 2004 EPA approved the Assabet River Total Maximum Daily Load for Total Phosphorus 16. The following measures are needed to ensure that current phosphorus loads from MS4 stormwater discharged directly or indirectly via tributaries into the Assabet River do not increase. 1. The operators of traditional and non-traditional MS4s located in municipalities listed in Table F-10 within the Assabet River Watershed shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (March/April) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow - release and phosphorous -free fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of phosphorous to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part I, II and III as well as Appendix F part A.111, A.IV, B.I, B.11 and B.111 where appropriate. part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for phosphorus removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs that infiltrate stormwater where feasible. 3. part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: Establish program to properly 16 Massachusetts Department of Environmental Protection, 2004. Assabet River Total Maximum Daily Load for Total Phosphorus. CN 201.0 Page 44 of 61 MA MS4 General Permit Appendix F manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increased street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a minimum of two times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1 — Dec 1; following leaf fall). Municipality Acton Berlin Bolton Boxborough Boylston Carlisle Clinton Concord Grafton Harvard Hudson Littleton Marlborough Maynard Northborough Shrewsbury Stow Westborough Westford Table F-10: Municipalities located in the Assabet River Watershed 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part AN.1. as follows. a. The permittee is relieved of its additional requirements as of the date when following conditions are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of phosphorus are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part AN.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part AN.1 to Page 45 of 61 MA MS4 General Permit Appendix F date to reduce phosphorus in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part AN.1 required to be implemented prior to the date of the newly approved TMDL including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 46 of 61 MA MS4 General Permit Appendix F B. Requirements for Discharges to Impaired Waters with an Approved Out of State TMDL I. Nitrogen TMDL Requirements Discharges from MS4s in Massachusetts to waters that are tributaries to the Long Island Sound, which has an approved TMDL for nitrogen", are subject to the requirements of this part. 1. The operators of traditional and non-traditional MS4s located in municipalities listed in Table F-11 shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (April/May) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow -release fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the Fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of nitrogen to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part 1,11 and III as well as Appendix F part A.111, A.IV, A.V, B.11 and B.111 where appropriate. part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for nitrogen removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs to reduce nitrogen discharges. 3. part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: establish requirements for use of 17 Connecticut Department of Environmental Protection. 2000. A Total Maximum Daily Load Analysis to Achieve Water Quality Standards for Dissolved Oxygen in Long Island Sound Page 47 of 61 MA MS4 General Permit Appendix F slow release fertilizers on permittee owned property currently using fertilizer, in addition to reducing and managing fertilizer use as provided in in part 2.3.7.1; establish procedures to properly manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increased street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a minimum of two (2) times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1 — Dec 1; following leaf fall). b. Nitrogen Source Identification Report Within four years of the permit effective date the permittee shall complete a Nitrogen Source Identification Report. The report shall include the following elements: 1. Calculation of total urbanized area within the permittee's jurisdiction that is within the Connecticut River Watershed, the Housatonic River Watershed, or the Thames River Watershed, incorporating updated mapping of the MS4 and catchment delineations produced pursuant to part 2.3.4.6, 2. All screening and monitoring results pursuant to part 2.3.4.7.d., targeting the receiving water segment(s) 3. Impervious area and DCIA for the target catchment 4. Identification, delineation and prioritization of potential catchments with high nitrogen loading 5. Identification of potential retrofit opportunities or opportunities for the installation of structural BMPs during re -development ii. The final Nitrogen Source Identification Report shall be submitted to EPA as part of the year 4 annual report. c. Structural BMPs Within five years of the permit effective date, the permittee shall evaluate all properties identified as presenting retrofit opportunities or areas for structural BMP installation under permit part 2.3.6.d.ii. or identified in the Nitrogen Source Identification Report. The evaluation shall include: The next planned infrastructure, resurfacing or redevelopment activity planned for the property (if applicable) OR planned retrofit date; The estimated cost of redevelopment or retrofit BMPs; and The engineering and regulatory feasibility of redevelopment or retrofit BMPs. ii. The permittee shall provide a listing of planned structural BMPs and a plan and schedule for implementation in the year 5 annual Page 48 of 61 MA MS4 General Permit Appendix F report. The permittee shall plan and install a minimum of one structural BMP as a demonstration project within six years of the permit effective date. The demonstration project shall be installed targeting a catchment with high nitrogen load potential. The permittee shall install the remainder of the structural BMPs in accordance with the plan and schedule provided in the year 5 annual report. iii. Any structural BMPs listed in Table 4-3 of Attachment 1 to Appendix H installed in the urbanized area by the permittee or its agents shall be tracked and the permittee shall estimate the nitrogen removal by the BMP consistent with Attachment 1 to Appendix H. The permittee shall document the BMP type, total area treated by the BMP, the design storage volume of the BMP and the estimated nitrogen removed in mass per year by the BMP in each annual report. Adams North Adams Agawam Northampton Amherst Oxford Ashburnham Palmer Ashby Paxton Auburn Pelham Belchertown Pittsfield Charlton Richmond Cheshire Russell Chicopee Rutland Dalton South Hadley Douglas Southampton Dudley Southbridge East Longmeadow Southwick Easthampton Spencer Gardner Springfield Granby Sturbridge Hadley Sutton Hampden Templeton Hatfield Ware Hinsdale Webster Holyoke West Springfield Lanesborough Westfield Leicester Westhampton Lenox Westminster Longmeadow Wilbraham Ludlow Williamsburg Millbury Winchendon Page 49 of 61 MA MS4 General Permit Appendix F Monson Table F-11: Massachusetts municipalities in which MS4 discharges are within the Connecticut River Watershed, the Housatonic River Watershed, or the Thames River Watershed. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part B.I.1. as follows: a. The permittee is relieved of its additional requirements as of the date when the following conditions are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of nitrogen are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part B.I.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part B.I.1 to date to reduce nitrogen in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part B.I.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 50 of 61 MA MS4 General Permit Appendix F II. Phosphorus TMDL Requirements There are currently eight approved phosphorus TMDLs for certain waterbody segments in Rhode Island that identify urban stormwater discharges in Massachusetts as sources that are contributing phosphorus to the impaired segments. The TMDLs include the Kickemuit Reservoir, Upper Kikemuit River, Kickemuit River, Ten Mile River, Central Pond, Turner Reservoir, Lower Ten Mile River, and Omega Pond TMDLs". Table F-12 lists municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing phosphorus to the impaired waterbody segments in Rhode Island, the impaired receiving water, and the approved TMDL name. Any permittee (traditional or non-traditional) that operates an MS4 in a municipality listed in Table F- 12 and that discharges to a waterbody or tributary of a waterbody listed on Table F-12 is subject to the requirements of this part. 1. The operators of traditional and non-traditional MS4s located in municipalities listed in Table F-12 and that discharge to a waterbody or a tributary of a waterbody identified on Table F-12 shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (March/April) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow -release and phosphorous - free fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of phosphorous to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part I,11 and III as well as Appendix F part A.111, A.IV, A.V, B.1, and B.111 where appropriate. 2. part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for is See http://www.dem.ri.goy/programs/benviron/water/quality/rest/reports.htm for all RI TMDL documents. (retrieved 6/30/2014) Page 51 of 61 MA MS4 General Permit Appendix F adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for phosphorus removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs that infiltrate stormwater where feasible. 3. part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: Establish program to properly manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increased street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a minimum of two times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1 — Dec 1; following leaf fall). b. Phosphorus Source Identification Report Within four years of the permit effective date the permittee shall complete a Phosphorus Source Identification Report. The report shall include the following elements: 1. Calculation of total urbanized area draining to the water quality limited receiving water segments or their tributaries, incorporating updated mapping of the MS4 and catchment delineations produced pursuant to part 2.3.4.6, 2. All screening and monitoring results pursuant to part 2.3.4.7.d., targeting the receiving water segment(s) 3. Impervious area and DCIA for the target catchment 4. Identification, delineation and prioritization of potential catchments with high phosphorus loading 5. Identification of potential retrofit opportunities or opportunities for the installation of structural BMPs during re development, including the removal of impervious area of permittee owned properties ii. The phosphorus source identification report shall be submitted to EPA as part of the year 4 annual report. c. Structural BMPs Within five years of the permit effective date, the permittee shall evaluate all permittee owned properties identified as presenting retrofit opportunities or areas for structural BMP installation under permit part 2.3.6.d.ii or identified in the Phosphorus Source Identification Report that are within the drainage area of the water quality limited water or its tributaries. The evaluation shall include: Page 52 of 61 MA MS4 General Permit Appendix F 1. The next planned infrastructure, resurfacing or redevelopment activity planned for the property (if applicable) OR planned retrofit date; 2. The estimated cost of redevelopment or retrofit BMPs; and 3. The engineering and regulatory feasibility of redevelopment or retrofit BMPs. ii. The permittee shall provide a listing of planned structural BMPs and a plan and schedule for implementation in the year 5 annual report. The permittee shall plan and install a minimum of one structural BMP as a demonstration project within the drainage area of the water quality limited water or its tributaries within six years of the permit effective date. The demonstration project shall be installed targeting a catchment with high phosphorus load potential. The permittee shall install the remainder of the structural BMPs in accordance with the plan and schedule provided in the year 5 annual report. iii. Any structural BMPs installed in the urbanized area by the permittee or its agents shall be tracked and the permittee shall estimate the phosphorus removal by the BMP consistent with Attachment 3 to Appendix F. The permittee shall document the BMP type, total area treated by the BMP, the design storage volume of the BMP and the estimated phosphorus removed in mass per year by the BMP in each annual report. Municipality Receiving Water TMDL Name Attleboro Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Omega Pond and Turner Reservoir North Upper Ten Mile Total Maximum Daily Load Attleborough River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Omega Pond and Turner Reservoir Plainville Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Omega Pond and Turner Reservoir Rehoboth Upper Kikemuit Fecal Coliform and Total River, Kickemuit Phosphorus River, Kickemuit TMDLs: Reservoir Page 53 of 61 MA MS4 General Permit Appendix F Municipality Receiving Water TMDL Name Kickemuit Reservoir, Rhode Island (RI0007034L-01) Upper Kickemuit River (RI 0007034R-01) Kickemuit River (MA 61- 08 2004 Seekonk Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Omega Pond and Turner Reservoir Swansea Upper Kikemuit Fecal Coliform and Total River, Kickemuit Phosphorus River, Kickemuit TMDLs: Reservoir Kickemuit Reservoir, Rhode Island (RI0007034L-01) Upper Kickemuit River (RI 0007034R-01) Kickemuit River (MA 61- 08 2004) Table F-12: Municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing phosphorus to the impaired waterbody segments in Rhode Island, the impaired receiving water, and the approved TMDL name. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part B.II.1. as follows: a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of phosphorus are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part B.II.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part B.11.1 to date to reduce phosphorus in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part B.II.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 54 of 61 MA MS4 General Permit Appendix F III. Bacteria and Pathogen TMDL Requirements There are currently six approved bacteria (fecal coliform bacteria) or pathogen (fecal coliform and/or enterococcus bacteria) TMDLs for certain waterbody segments in Rhode Island that identify urban stormwater discharges in Massachusetts as sources that are contributing bacteria or pathogens to the impaired segments. The TMDLs include the Kickemuit Reservoir, Upper Kikemuit River, Ten Mile River, Lower Ten Mile River and Omega Pond TMDLs19 Table F-13 lists municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing bacteria or pathogens to the impaired waterbody segments in Rhode Island„ the impaired receiving water, and the approved TMDL name. Any permittee (traditional or non-traditional) that operates an MS4 in a municipality listed in Table F-13 and that discharges to a waterbody or a tributary of a waterbody listed on Table F-13 is subject to the requirements of this part. 1) Traditional and non-traditional MS4s operating in the municipalities identified in Table F-13 and that discharge to a waterbody or a tributary of a waterbody identified on Table F-13 shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below:: a. Enhanced 13MPs Enhancement of BMPs required by part 2.3 of the permit that shall be implemented during this permit term: part 2.3.3. Public Education: The permittee shall supplement its Residential program with an annual message encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee or its agents shall disseminate educational materials to dog owners at the time of issuance or renewal of a dog license, or other appropriate time. Education materials shall describe the detrimental impacts of improper management of pet waste, requirements for waste collection and disposal, and penalties for non-compliance. The permittee shall also provide information to owners of septic systems about proper maintenance in any catchment that discharges to a water body impaired for bacteria or pathogens. All public education messages can be combined with requirements of Appendix H part I, II and III as well as Appendix F part A.111, A.IV, AN, B.I, and B.II where appropriate. 2. part 2.3.4 Illicit Discharge: Catchments draining to any waterbody impaired for bacteria or pathogens shall be designated either Problem Catchments or HIGH priority in implementation of the IDDE program. 19 See http://www.dem.ri. og y/programs/benviron/water/quality/rest/reports.htm for all RI TMDL documents. (retrieved 6/30/2014) Page 55 of 61 MA MS4 General Permit Appendix F Municipality Receiving Water TMDL Name Attleboro Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Omega Pond North Upper Ten Mile Total Maximum Daily Load Attleborough River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Omega Pond Plainville Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Omega Pond Rehoboth Upper Kikemuit Fecal Coliform and Total River, Kickemuit Phosphorus Reservoir TMDLs: Kickemuit Reservoir, Rhode Island (RI0007034L-01) Upper Kickemuit River (RI 0007034R-01) Kickemuit River (MA 61- 08 2004) Seekonk Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Omega Pond Table F-13: Municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing bacteria or pathogens to the impaired waterbody segments in Rhode Island„ the impaired receiving water, and the approved TMDL name 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part B.III.1. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of bacteria/pathogens are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part B.111.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part B.III.1 to date to reduce bacteria/pathogens in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part B.III.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation Page 56 of 61 MA MS4 General Permit Appendix F of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 57 of 61 MA MS4 General Permit Appendix F IV. Metals TMDL Requirements There are currently five approved metals TMDL for a waterbody segment in Rhode Island that that identifies urban stormwater discharges in Massachusetts as sources that are contributing metals (Cadmium, Lead, Aluminum, Iron) to the impaired segment. The TMDLs include the Upper Ten Mile River, Lower Ten Mile River, Central Pond, Turner Reservoir and Omega Pond TMDLs.20 Table F-14 lists municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing metals to the impaired waterbody segments in Rhode Island, the impaired receiving water, the approved TMDL name, and the pollutant of concern. Any permittee (traditional or non-traditional) that operates an MS4 in a municipality listed in Table F-14 and the discharge is to a waterbody or tributary of a waterbody listed on Table F-14 is subject to the requirements of this part. 1) Traditional and non-traditional MS4s operating in the municipalities identified in Table F-14 and that discharge to a waterbody or a tributary of a waterbody identified on Table F-14 shall identify and implement BMPs designed to reduce metals discharges from its MS4. To address metals discharges, each permittee shall comply with the following BMPs in addition to the requirements of part 2.3 of the Permit, as described below: a. Enhanced BMPs i. The permittee remains subject to the requirements of part 2.3. of the permit and shall include the following enhancements to the BMPs required by part 2.3 of the permit: 1. part 2.3.6, Stormwater Management in New Development and Redevelopment: stormwater management systems designed on commercial and industrial land use area draining to the water quality limited waterbody shall incorporate designs that allow for shutdown and containment where appropriate to isolate the system in the event of an emergency spill or other unexpected event. EPA also encourages the permittee to require any stormwater management system designed to infiltrate stormwater on commercial or industrial sites to provide the level of pollutant removal equal to or greater than the level of pollutant removal provided through the use of biofiltration of the same volume of runoff to be infiltrated, prior to infiltration. 2. part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: increased street sweeping frequency of all municipal owned streets and parking lots to a schedule determined by the permittee to target areas with potential for high pollutant loads. This may include, but is not limited to, increased street sweeping frequency in commercial areas and high density residential areas, or 21 See http://www.dem.ri.goy/programs/benviron/water/quality/rest/rgports.htm for all RI TMDL documents. (retrieved 6/30/2014) Page 58 of 61 MA MS4 General Permit Appendix F drainage areas with a large amount of impervious area. Prioritize inspection and maintenance for catch basins to ensure that no sump shall be more than 50 percent full. Clean catch basins more frequently if inspection and maintenance activities indicate excessive sediment or debris loadings. Each annual report shall include the street sweeping schedule determined by the permittee to target high pollutant loads. Municipality Receiving Water TMDL Name Attleboro Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Turner Reservoir, Omega Pond North Upper Ten Mile Total Maximum Daily Load Attleborough River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Turner Reservoir, Omega Pond Plainville Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Turner Reservoir, Omega Pond Seekonk Upper Ten Mile Total Maximum Daily Load River, Lower Ten Analysis For The Ten Mile River, Mile River Watershed Central Pond, Turner Reservoir, Omega Pond Table F-14: Municipalities in Massachusetts identified in the TMDLs as containing MS4s contributing metals to the impaired waterbody segments in Rhode Island, the impaired receiving water, the approved TMDL name, and the pollutant of concern. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix F part B.IV.1. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The applicable TMDL has been modified, revised or withdrawn and EPA has approved a new TMDL applicable for the receiving water that indicates that no additional stormwater controls for the control of metals (Cadmium, Lead, Aluminum, Iron) are necessary for the permittee's discharge based on wasteload allocations in the newly approved TMDL Page 59 of 61 MA MS4 General Permit Appendix F b. In such a case, the permittee shall document the date of the approved TMDL in its SWMP and is relieved of any remaining requirements of Appendix F part B.IV.1 as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix F part B.IV. 1 to date to reduce metals (Cadmium, Lead, Aluminum, Iron) in their discharges including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix F part B.IV.1 required to be implemented prior to the date of the newly approved TMDL, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 60 of 61 MA MS4 General Permit Appendix F C. Requirements for Discharges to Impaired Waters with a Regional TMDL I. The "Northeast Regional Mercury TMDL (2007)" The Northeast Regional Mercury TMDL does not specify a wasteload allocation or other requirements either individually or categorically for the MS4 discharges and specifies that load reductions are to be achieved through reduction in atmospheric deposition sources. No requirements related to this TMDL are imposed on MS4 discharges under this part. However, if the permittee becomes aware, or EPA or MassDEP determines, that an MS4 discharge is causing or contributing to such impairment to an extent that cannot be explained by atmospheric deposition (e.g. chemical spill, acid landfill leachate or other sources), the permittee shall comply with the requirements of part 2.1.1.d and 2.3.4 of the permit. Page 61 of 61 Appendix F Attachment 1 ATTACHMENT 1 TO APPENDIX F Method to Calculate Baseline Phosphorus Load (Baseline), Phosphorus Reduction Requirements and Phosphorus load increases due to development (PDEv,,,,) The methods and annual phosphorus load export rates presented in Attachments 1, 2 and 3 are for the purpose of measuring load reductions for various stormwater BMPs treating runoff from different site conditions (i.e. impervious or pervious) and land uses (e.g. commercial, industrial, residential). The estimates of annual phosphorus load and load reductions due to BMPs are intended for use by the permittee to measure compliance with its Phosphorus Reduction Requirement under the permit. This attachment provides the method to calculate a baseline phosphorus load discharging in stormwater for the impaired municipalities subject to Lakes and Ponds TMDL. A complete list of municipalities subject to these TMDLs is presented in Appendix F, Table F-6. This method shall be used to calculate the following annual phosphorus loads: 1) Baseline Phosphorus Load for Permittees 2) Phosphorus Reduction Requirement This attachment also provides the method to calculate stormwater phosphorus load increases due to development for the municipalities subject to the Charles River TMDL requirements and the Lakes & Ponds TMDL requirements: 3) Phosphorus Load Increases due to Development The Baseline Phosphorus Load is a measure of the annual phosphorus load discharging in stormwater from the impervious and pervious areas of the impaired Lake Phosphorus Control Plan (LPCP) Area. The Baseline Phosphorus Pounds Reduction referred to as the permittee's Phosphorus Reduction Requirement represents the required reduction in annual phosphorus load in stormwater to meet the WLA for the impaired watershed. The percent phosphorus reduction for each watershed (identified in Appendix F, Table F-6) is applied to the Baseline Phosphorus Load to calculate the Phosphorus Pounds Reduction. The Phosphorus load increases due to development (PDEvi„c) is the stormwater phosphorus load increases due to development over the previous reporting period and incurred to date. Increases in stormwater phosphorus load from development will increase the permittee's baseline phosphorus load and therefore, the phosphorus reduction requirement. Examples are provided to illustrate use of the methods. Table 1-1 below provides annual composite phosphorus load export rates (PLERs) by land use category for the Baseline Load and Phosphorus Reduction Requirement calculations. The permittee shall select the land use category that most closely represents the actual use of the watershed. For watersheds with institutional type uses, such as government properties, hospitals, and schools, the permittee shall use the commercial land use category for the purpose of calculating phosphorus loads. Table 1-2 provides annual PLERs by land use category for impervious and pervious areas. The permittee shall select the land use category that most closely represents the actual use of the watershed. For pervious areas, if the hydrologic soil group (HSG) is known, use the appropriate value. If the HSG is not known, assume HSG C conditions for the phosphorus load export rate. For watersheds with Page 1 of 6 Appendix F Attachment 1 institutional type uses, such as government properties, hospitals, and schools, the permittee shall use the commercial/industrial land use category for the purpose of calculating phosphorus loads. Table 1-3 provides a crosswalk table of land use codes between Tables 1-1 and 1-2 and the codes used by MassGIS. The composite PLERs in Table 1-1 to be used for calculating Baseline Phosphorus Load are based on the specified directly connected impervious area (I)CIA). If the permittee determines through mapping and site investigations that the overall DCIA for the collective area for each land use category is different than the corresponding values in Table 1-1, then the permittee is encouraged to submit this information in its annual report and request EPA to recalculate the composite PLERs for the permittees to use in refining the Baseline Phosphorus Load calculation for the LPCP. (1) Baseline Phosphorus Load: The permittee shall calculate the Baseline Phosphorus Load by the following procedure: 1) Determine the total area (acre) associated with the impaired watershed; 2) Sort the total area associated with the watershed into land use categories; 3) Calculate the annual phosphorus load associated with each land use category by multiplying the total area of land use by the appropriate land use -based composite phosphorus load export rate provided in Table 1-1; and 4) Determine the Baseline Phosphorus Load by summing the land use loads. Example 1-1 to determine Baseline Phosphorus Load: Watershed A is 18.0 acres, with 11.0 acres of industrial area (e.g. access drives, buildings, and parking lots), 3.0 acres of medium -density residential and 4.0 acres of unmanaged wooded area. The Baseline Phosphorus Load = (Baseline P Load iND) + (Baseline P Load MDR) + (Baseline P Load FOR) Where: Baseline P Load IND = (TAND) x (PLER for industrial use (Table 1-1)) = 11.0 acre x 1.27 lbs/acre/year = 14.0 lbs P/year Baseline P Load MDR = (TAMDR) x (PLER for medium density residential (Table 1-1)) = 3.0 acre x 0.49 lbs/acre/year = 1.5 lbs P/year Baseline P Load FOR = (TAFOR) x (PLER for forest (Table 1-1)) = 4.0 acre x 0.12 lbs/acre/year = 0.5 lbs P/year Baseline Phosphorus Load = 14.0 lbs P/year + 1.5 lbs P/year + 0.5 lbs P/year =16.0 lbs P/year Page 2 of 6 Appendix F Attachment 1 (2) Baseline Phosphorus Pounds Reduction (Phosphorus Reduction Requirement): The Baselines Phosphorus Reduction requirement is the amount of reduction in annual phosphorus load (in pounds) that the permittee is required to achieve in the Watershed. The permittee shall calculate the Phosphorus Reduction Requirement by multiplying the Baseline Phosphorus Load by the applicable percent phosphorus reduction for that watershed specified in Table F-6 (Appendix F). Example 1-2 to determine Watershed Phosphorus Reduction Requirement: Table F-6 identifies Watershed A's percent phosphorus reduction as 45%; therefore the Watershed Phosphorus Reduction Requirement is: Phosphorus Reduction Requirement = (Baseline Phosphorus Load) x (0.45) = (16.0 lbs P/year) x (0.45) = 7.2 lbs P/year (3) Phosphorus load increases due to development (PDEyinc): To estimate the increases in stormwater phosphorus load due to development in the Watershed (either PCP or LPCP Area), the permittee will use the following procedure: 1) Determine the total area of development by land use category and calculate the baseline load from that area using the composite PLERs in Table 1-1; 2) Distribute the total development area into impervious and pervious subareas by land use category; 3) Calculate the phosphorus load due to development (PDEV) for each land use -based impervious and pervious subarea by multiplying the subarea by the appropriate phosphorus load export rate provided in Table 1-2; and 4) Determine the phosphorus load increase (PDEvinc) by subtracting the baseline phosphorus load from the increased phosphorus load due to development. Note: If structural BMPs are installed as part of new development, the PDEVinc will be reduced by the amount of BMP load treated by that BMP as calculated in Attachment 3. Example 1-3 to determine Phosphorus Load Increases: For the same 15.11 acre Watershed A as specified in Example 1-1, a permittee has tracked development in the LPCP Area in the last year that resulted in 1.5 acres of medium density residential area and 0.5 acres of forest land being converted to high density residential impervious area as detailed below. The undeveloped MDR area is pervious area, HSG C soil and the undeveloped forest area is pervious, HSG B soil. Land Use Baseline P export Baseline P export rate Developed P export rate Category Area rate area (lbs Area converted (lbs (acres) (lbs unchanged P/acre/yr)** to HDR IA P/acre/yr)** P/acre/yr)* (acres) (acres) Industrial 11.0 1.27 No change -- No change -- MDR 3.0 0.49 1.5 0.21 1.5 2.32 Page 3 of 6 Appendix F Attachment 1 Forest 4.0 1 0.12 1 3.5 0.12 0.5 2.32 *From Table 1-1; ** From Table 1-2 The phosphorus load increase is calculated as: Baseline Load = (Baseline P Load IND) + (Baseline P Load MDR) + (Baseline P Load FOR) = 16.0 lb/year (determined in Example 1-1) PDEV = (TAIND X PLERIND)+(lAHDR X PLERHDR)+(PAMDR X PLERMDR)+(PAFOR X PLERF.,) = (11.0 acres * 1.27) + (2.0 acres * 2.32) + (1.5 acres * 0.21) + (3.5 0.12) =19.0 lbs P/year PDEvi., = PDEV - Baseline Load = 19.0 - 16.0 = 3.0 lbs/year Table 1-1. Annual composite phosphorus load export rates Representative Composite PLERs, Land Cover DCIA, % Composite PLERs, lb/ac/yr kg/ha/yr Commercial 57 1.13 1.27 Industrial 67 1.27 1.42 High Density 36 1.04 1.16 Residential Medium Density 16 0.49 0.55 Residential Low Density 11 0.30 0.34 Residential Freeway 44 0.73 0.82 Open Space 8 0.26 0.29 Agriculture 0.4 0.45 0.50 Forest 0.1 0.12 0.13 Page 4 of 6 Appendix F Attachment Table 1-2: Proposed average annual distinct P Load export rates for use in estimating P Load reduction credits the MA MS4 Permit Phosphorus Source Land Surface P Load Export p Load Export Category by Land Use Cover Rate, lbs/acre/year Rate, kg/ha/yr Directly connected 1.78 2.0 Commercial (Com) and impervious Industrial (Ind) Pervious See* DevPERV See* DevPERV Multi -Family (MFR) and Directly connected 2.32 2.6 High -Density Residential impervious Pervious See* DevPERV See* DevPERV (HDR) Medium -Density Directly connected 1.96 2.2 Residential (MDR) impervious Pervious See* DevPERV See* DevPERV Low Density Residential Directly connected 1.52 1.7 (LDR) - "Rural' impervious Pervious See* DevPERV See* DevPERV Directly connected 1.34 1.5 Highway (HWY) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Forest (For) impervious Pervious 0.13 0.13 Directly connected 1.52 1.7 Open Land (Open) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Agriculture (Ag) impervious Pervious 0.45 0.5 *Developed Land Pervious (DevPERV)- Hydrologic Pervious 0.03 0.03 Soil Group A *Developed Land Pervious (DevPERV)- Hydrologic Pervious 0.12 0.13 Soil Group B *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.21 0.24 Soil Group C *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.29 0.33 Soil Group C/D *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.37 0.41 Soil Group D Page 5 of 6 Appendix F Attachment 1 Table 1-3: Crosswalk of MassGIS land -use categories to land -use groups for P Load Calculations Mass GIS Land Use LU_CODE Description Land Use group for calculating P Load - 2013/14 MA MS4 1 Crop Land Agriculture 2 Pasture (active) Agriculture 3 Forest Forest 4 Wetland Forest 5 Mining Industrial 6 Open Land includes inactive pasture open land 7 Participation Recreation open land 8 spectator recreation open land 9 Water Based Recreation open land 10 Multi -Family Residential High Density Residential 11 High Density Residential High Density Residential 12 Medium Density Residential Medium Density Residential 13 Low Density Residential Low Density Residential 14 Saltwater Wetland Water 15 Commercial Commercial 16 Industrial Industrial 17 Urban Open open land 18 Transportation Highway 19 Waste Disposal Industrial 20 Water Water 23 cranberry bog Agriculture 24 Powerline open land 25 Saltwater Sandy Beach open land 26 Golf Course Agriculture 29 Marina Commercial 31 Urban Public Commercial 34 Cemetery open land 35 Orchard Forest 36 Nursery Agriculture 37 Forested Wetland Forest 38 Very Low Density residential Low Density Residential 39 Junkyards Industrial 40 Brush land/Successional Forest Page 6 of 6 Appendix F Attachment 2 ATTACHMENT 2 TO APPENDIX F Phosphorus Reduction Credits for Selected Enhanced Non -Structural BMPs The permittee shall use the following methods to calculate phosphorus load reduction credits for the following enhanced non-structural control practices implemented in the Watershed: 1) Enhanced Sweeping Program; 2) Catch Basin Cleaning; and 3) Organic Waste and Leaf Litter Collection program The methods include the use of default phosphorus reduction factors that EPA has determined are acceptable for calculating phosphorus load reduction credits for these practices. The methods and annual phosphorus load export rates presented in this attachment are for the purpose of counting load reductions for various BMPs treating storm water runoff from varying site conditions (i.e., impervious or pervious surfaces) and different land uses (e.g. industrial and commercial) within the impaired watershed. Table 2-1 below provides annual phosphorus load export rates by land use category for impervious and pervious areas. The estimates of annual phosphorus load and load reductions resulting from BMP implementation are intended for use by the permittee to measure compliance with its Phosphorus Reduction Requirement under the permit. Examples are provided to illustrate use of the methods. In calculating phosphorus export rates, the permittee shall select the land use category that most closely represents the actual use for the area in question. For watersheds with institutional type uses, such as government properties, hospitals, and schools, the permittee shall use the commercial land use category for the purpose of calculating phosphorus loads. Table 2-2 provides a crosswalk table of land use codes between land use groups in Table 2-1 and the codes used by Mass GIS. For pervious areas, permittees should use the appropriate value for the hydrologic soil group (HSG) if known, otherwise, assume HSG C conditions. Alternative Methods and/or Phosphorus Reduction Factors: A permittee may propose alternative methods and/or phosphorus reduction factors for calculating phosphorus load reduction credits for these non-structural practices. EPA will consider alternative methods and/or phosphorus reduction factors, provided that the permittee submits adequate supporting documentation to EPA. At a minimum, supporting documentation shall consist of a description of the proposed method, the technical basis of the method, identification of alternative phosphorus reduction factors, supporting calculations, and identification of references and sources of information that support the use of the alternative method and/or factors in the Watershed. If EPA determines that the alternative methods and/or factors are not adequately supported, EPA will notify the permittee and the permittee may receive no phosphorus reduction credit other than a reduction credit calculated by the permittee following the methods in this attachment for the identified practices. Page 1 of 7 Appendix F Attachment 2 Table 2-1: Proposed average annual distinct P Load export rates for use in estimating P Load reduction credits in the MA MS4 Permit Phosphorus Source Category by Land Surface Cover P Load Export Rate, P Load Export Rate, Land Use lbs/acre/year kg/ha/yr Commercial (Com) and Industrial Directly connected 1.78 2.0impervious (Ind) Pervious See* DevPERV See* DevPERV Multi -Family (MFR) and High- Directly connected impervious 2.32 2.6 Density Residential (HDR) Pervious See* DevPERV See* DevPERV Medium -Density Residential Directly connected impervious 1.96 2.2 (MDR) Pervious See* DevPERV See* DevPERV Low Density Residential (LDR) - Directly connected 1.52 1.7 "Rural" impervious Pervious See* DevPERV See* DevPERV Directly connected 1.34 1.5 Highway (HWY) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Forest (For) impervious Pervious 0.13 0.13 Directly connected 1.52 1.7 Open Land (Open) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Agriculture (Ag) impervious Pervious 0.45 0.5 *Developed Land Pervious Pervious 0.03 0.03 (DevPERV) — HSG A *Developed Land Pervious Pervious 0.12 0.13 (DevPERV) — HSG B *Developed Land Pervious Pervious 0.21 0.24 (DevPERV) — HSG C *Developed Land Pervious Pervious 0.29 0.33 (DevPERV) — HSG C/D *Developed Land Pervious Pervious 0.37 0.41 (DevPERV) — HSG D Notes: • For pervious areas, if the hydrologic soil group (HSG) is known, use the appropriate value from this table. If the HSG is not known, assume HSG C conditions for the phosphorus load export rate. • Agriculture includes row crops. Actively managed hay fields and pasture lands. Institutional land uses such as government properties, hospitals and schools are to be included in the commercial and industrial land use grouping for the purpose of calculating phosphorus loading. • Impervious surfaces within the forest land use category are typically roadways adjacent to forested pervious areas. Page 2 of 7 Appendix F Attachment 2 Table 2-2: Crosswalk of Mass GIS land use categories to land use groups for P load calculations Mass GIS Land Use LU_CODE Description Land Use group for calculating P Load - 2013/14 MA MS4 1 Crop Land Agriculture 2 Pasture (active) Agriculture 3 Forest Forest 4 Wetland Forest 5 Mining Industrial 6 Open Land includes inactive pasture open land 7 Participation Recreation open land 8 spectator recreation open land 9 Water Based Recreation open land 10 Multi -Family Residential High Density Residential 11 High Density Residential High Density Residential 12 Medium Density Residential Medium Density Residential 13 Low Density Residential Low Density Residential 14 Saltwater Wetland Water 15 Commercial Commercial 16 Industrial Industrial 17 Urban Open open land 18 Transportation Highway 19 Waste Disposal Industrial 20 Water Water 23 cranberry bog Agriculture 24 Powerline open land 25 Saltwater Sandy Beach open land 26 Golf Course Agriculture 29 Marina Commercial 31 Urban Public Commercial 34 Cemetery open land 35 Orchard Forest 36 Nursery Agriculture 37 Forested Wetland Forest 38 Very Low Density residential Low Density Residential 39 Junkyards Industrial 40 Brush land/Successional Forest Page 3 of 7 Appendix F Attachment 2 (1) Enhanced Sweeping Program: The permittee may earn a phosphorus reduction credit for conducting an enhanced sweeping program of impervious surfaces. Table 2-2 below outlines the default phosphorus removal factors for enhanced sweeping programs. The credit shall be calculated by using the following equation: Credit sweeping — IA swept X PLE IC -land use X PRF sweeping AF (Equation 2-1) Where: Credit sweeping = Amount of phosphorus load removed by enhanced sweeping program (lb/year) IA Swept = Area of impervious surface that is swept under the enhanced sweeping program (acres) PLE IC -land use = Phosphorus Load Export Rate for impervious cover and specified land use (lb/acre/yr) (see Table 2-1) PRF Sweeping = Phosphorus Reduction Factor for sweeping based on sweeper type and frequency (see Table 2-3). AF = Annual Frequency of sweeping. For example, if sweeping does not occur in Dec/Jan/Feb, the AF would be 9 mo./12 mo. = 0.75. For year-round sweeping, AF=1.01 As an alternative, the permittee may apply a credible sweeping model of the Watershed and perform continuous simulations reflecting build-up and wash -off of phosphorus using long-term local rainfall data. Table 2-3: Phosphorus reduction efficiency factors (PRFsweeping) for sweeping impervious areas Frequency' Sweeper Technology PRF sweeping 2/year (spring and fall)2 Mechanical Broom 0.01 2/year (spring and fall)2 Vacuum Assisted 0.02 2/year (spring and fall)2 High -Efficiency Regenerative Air -Vacuum 0.02 Monthly Mechanical Broom 0.03 Monthly Vacuum Assisted 0.04 Monthly High Efficiency Regenerative Air -Vacuum 0.08 Weekly Mechanical Broom 0.05 Weekly Vacuum Assisted 0.08 Weekly High Efficiency Regenerative Air -Vacuum 0.10 IFor full credit for monthly and weekly frequency, sweeping must be conducted year round. Otherwise, the credit should be adjusted proportionally based on the duration of the sweeping season (using AF factor). 2 In order to earn credit for semi-annual sweeping the sweeping must occur in the spring following snow - melt and road sand applications to impervious surfaces and in the fall after leaf -fall and prior to the onset to the snow season. Page 4 of 7 Appendix F Attachment 2 Example 2-1: Calculation of enhanced sweeping program credit (Credit sweeping): A permittee proposes to implement an enhanced sweeping program and perform weekly sweeping from March 1 — December 1 (9 months) in their Watershed, using a vacuum assisted sweeper on 20.3 acres of parking lots and roadways in a high -density residential area of the Watershed. For this site the needed information is: IA swept = 20.3 acres PLE IC-xDR = 2.32 lb/acre/yr (from Table 2-1) PRF sweeping = 0.08 (from Table 2-3) AF = (9 months / 12 months) = 0.75 Substitution into equation 2-1 yields a Credit sweeping of 3.2 pounds of phosphorus removed per year. Credit sweeping — IA swept x PLE land use x PRF sweeping x AF = 20.3 acres x 2.32 lbs/acre/yr x 0.08 x 0.75 = 2.8 lbs/yr (2) Catch Basin Cleaning: The permittee may earn a phosphorus reduction credit, Credit CB, by removing accumulated materials from catch basins (i.e., catch basin cleaning) in the Watershed such that a minimum sump storage capacity of 50% is maintained throughout the year. The credit shall be calculated by using the following equation: Credit CB = IACB x PLE IC -land use x PRFCB (Equation 2-2) Where: Credit CB = Amount of phosphorus load removed by catch basin cleaning (lb/year) IA CB = Impervious drainage area to catch basins (acres) PLE IC -and use = Phosphorus Load Export Rate for impervious cover and specified land use (lb/acre/yr) (see Table 2-1) PRF CB = Phosphorus Reduction Factor for catch basin cleaning (see Table 2-4) Table 2-4: Phosphorus reduction efficiency factor (PRF CB) for semi-annual catch basin cleaning Frequency Practice PRF CB Semi-annual Catch Basin Cleaning 0.02 Page 5 of 7 Appendix F Attachment 2 Example 2-2: Calculation for catch basin cleaning credit (Credit cB): A permittee proposes to clean catch basins in their Watershed (i.e., remove accumulated sediments and contaminants captured in the catch basins) that drain runoff from 15.3 acres of medium -density residential impervious area. For this site the needed information is: IACB = 15.3 acre PLE IC -MDR = 1.96 lbs/acre/yr (from Table 2-1) PRF CB = 0.02 (from Table 2-4) Substitution into equation 2-2 yields a Credit CB of 0.6 pounds of phosphorus removed per year: Credit CB = IACB x PLE IC -MDR x PRF CB = 15.3 acre x 1.96 lbs/acre/yr x 0.02 = 0.61bs/yr (3) Enhanced Organic Waste and Leaf Litter Collection program: The permittee may earn a phosphorus reduction credit by performing regular gathering, removal and disposal of landscaping wastes, organic debris, and leaf litter from impervious surfaces from which runoff discharges to the TMDL waterbody or its tributaries. In order to earn this credit (Credit Ieaflitter), the permittee must gather and remove all landscaping wastes, organic debris, and leaf litter from impervious roadways and parking lots at least once per week during the period of September 1 to December 1 of each year. Credit can only be earned for those impervious surfaces that are cleared of organic materials in accordance with the description above. The gathering and removal shall occur immediately following any landscaping activities in the Watershed and at additional times when necessary to achieve a weekly cleaning frequency. The permittee must ensure that the disposal of these materials will not contribute pollutants to any surface water discharges. The permittee may use an enhanced sweeping program (e.g., weekly frequency) as part of earning this credit provided that the sweeping is effective at removing leaf litter and organic materials. The Credit leaf litter shall be determined by the following equation: Credit leafllttr = (Watershed Area) x (PLE IC -land use) x (0.05) (Equation 2-3) Where: Credit leaf litter = Amount of phosphorus load reduction credit for organic waste and leaf litter collection program (lb/year) Watershed Area = All impervious area (acre) from which runoff discharges to the TMDL waterbody or its tributaries in the Watershed PLE IC -land use = Phosphorus Load Export Rate for impervious cover and specified land use (lbs/acre/yr) (see Table 2-1) 0.05 = 5% phosphorus reduction factor for organic waste and leaf litter collection program in the Watershed Page 6 of 7 Appendix F Attachment 2 Example 2-3: Calculation for organic waste and leaf litter collection program credit Credit leaf litter): A permittee proposes to implement an organic waste and leaf litter collection program by sweeping the parking lots and access drives at a minimum of once per week using a mechanical broom sweeper for the period of September 1 to December 1 over 12.5 acres of impervious roadways and parking lots in an industrial/commercial area of the Watershed. Also, the permittee will ensure that organic materials are removed from impervious areas immediately following all landscaping activities at the site. For this site the needed information to calculate the Credit ieaf iitter is: Watershed Area = 12.5 acres; and PLE IC -commercial = 1.78 lbs/acre/yr (from Table 2-1) Substitution into equation 2-4 yields a Credit leaf litter of 1. l pounds of phosphorus removed per year: Credit Ieaflitter = (12.5 acre) x (1.78 lbs/acre/yr) x (0.05) = 1.1 lbs/yr The permittee also may earn a phosphorus reduction credit for enhanced sweeping of roads and parking lot areas (i.e., Credit Sweeping) for the three months of use. Using equation 2-1, Credit sweeping is: Credit sweeping = IA swept X PLE IC -land use X PRF sweepingX AF (Equation 2-1) IA Swept = 12.5 acre PLE IC -commercial = 1.78 lbs/acre/yr (from Table 2-1) PRF sweeping = 0.05 (from Table 2-3) AF = 3 mo./12 mo. = 0.25 Substitution into equation 2-1 yields a Credit Sweeping of 0.28 pounds of phosphorus removed per year. Credit sweeping = IA swept X PLE IC -commercial X PRF sweeping X AF = 12.5 acre x 1.78 lbs/acre/yr x 0.05 x 0.25 = 0.3 lbs/yr Page 7 of 7 Appendix F Attachment 3 ATTACHMENT 3 TO APPENDIX F Methods to Calculate Phosphorus Load Reductions for Structural Stormwater Best Management Practices List of Tables: Table 3-1: Average annual distinct phosphorus load (P Load) export rates for use in estimating phosphorus load reduction credits the MA MS4 Permit............................................................... 10 Table 3- 2: MassGIS land -use categories with associated land -use groups for phosphorus load calculations................................................................................................................................... 11 Table 3- 3: Developed Land Pervious Area Runoff Depths based on Precipitation depth and Hydrological Soil Groups (HSGs)................................................................................................ 20 Table 3- 4: Infiltration Trench (IR = 0.17 in/hr) BMP Performance Table .................................. 34 Table 3- 5: Infiltration Trench (IR = 0.27 in/hr) BMP Performance Table .................................. 35 Table 3- 6: Infiltration Trench (IR = 0.52 in/hr) BMP Performance Table .................................. 36 Table 3- 7: Infiltration Trench (IR = 1.02 in/hr) BMP Performance Table .................................. 37 Table 3- 8: Infiltration Trench (IR = 2.41 in/hr) BMP Performance Table .................................. 38 Table 3- 9: Infiltration Trench (8.27 in/hr) BMP Performance Table .......................................... 39 Table 3- 10: Infiltration Basin (0.17 in/hr) BMP Performance Table .......................................... 40 Table 3- 11: Infiltration Basin (0.27 in/hr) BMP Performance Table .......................................... 41 Table 3- 12: Infiltration Basin (0.52 in/hr) BMP Performance Table .......................................... 42 Table 3- 13: Infiltration Basin (1.02 in/hr) BMP Performance Table .......................................... 43 Table 3- 14: Infiltration Basin (2.41 in/hr) BMP Performance Table .......................................... 44 Table 3- 15: Infiltration Basin (8.27 in/hr) BMP Performance Table .......................................... 45 Table 3- 16: Biofiltration BMP Performance Table..................................................................... 46 Table 3- 17: Gravel Wetland BMP Performance Table................................................................ 47 Table 3- 18: Porous Pavement BMP Performance Table............................................................. 48 Table 3- 19: Wet Pond BMP Performance Table......................................................................... 49 Table 3- 20: Dry Pond BMP Performance Table.......................................................................... 49 Table 3- 21: Grass Swale BMP Performance Table..................................................................... 50 Table 3- 22: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 8:1.................................................................................................................................... 51 Table 3- 23: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 6:1.................................................................................................................................... 53 Table 3- 24: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 4:1.................................................................................................................................... 56 Table 3- 25: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1.................................................................................................................................... 58 Table 3- 26: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 1:1.................................................................................................................................... 61 Table 3- 27: Impervious Area Disconnection Performance Table ............................................... 63 Table 3- 28: Performance Table for Conversion of Impervious Areas to Pervious Area based on HydrologicalSoil Groups............................................................................................................. 64 Table 3- 29: Performance Table for Conversion of Low Permeable Pervious Area to High Permeable Pervious Area based on Hydrological Soil Group ...................................................... 65 List of Figures: Page 1 of 67 Appendix F Attachment 3 Figure 3- 1: BMP Performance Curve: Infiltration Trench (infiltration rate = 0.17 in/hr)........... 34 Figure 3- 2: BMP Performance Curve: Infiltration Trench (infiltration rate = 0.27 in/hr)........... 35 Figure 3- 3: BMP Performance Curve: Infiltration Trench (infiltration rate = 0.52 in/hr)........... 36 Figure 3- 4: BMP Performance Curve: Infiltration Trench (infiltration rate = 1.02 in/hr)........... 37 Figure 3- 5: BMP Performance Curve: Infiltration Trench (infiltration rate = 2.41 in/hr)........... 38 Figure 3- 6: BMP Performance Curve: Infiltration Trench (infiltration rate = 8.27 in/hr)........... 39 Figure 3- 7: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.17 in/hr)............. 40 Figure 3- 8: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.27 in/hr)............. 41 Figure 3- 9: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.52 in/hr)............. 42 Figure 3- 10: BMP Performance Curve: Infiltration Basin (Soil infiltration rate = 1.02 in/hr) ... 43 Figure 3- 11: BMP Performance Curve: Infiltration Basin (infiltration rate = 2.41 in/hr)........... 44 Figure 3- 12: BMP Performance Curve: Infiltration Basin (infiltration rate = 8.27 in/hr)........... 45 Figure 3- 13: BMP Performance Curve: Biofiltration.................................................................. 46 Figure 3- 14: BMP Performance Curve: Gravel Wetland............................................................ 47 Figure 3- 15: BMP Performance Curve: Porous Pavement.......................................................... 48 Figure 3- 16: BMP Performance Curve: Dry Pond...................................................................... 49 Figure 3- 17: BMP Performance Curve: Grass Swale.................................................................. 50 Figure 3- 18: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG A Soils................................................................................................ 51 Figure 3- 19: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG B Soils................................................................................................ 52 Figure 3- 20: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG C Soils................................................................................................ 52 Figure 3- 21: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG D Soils................................................................................................ 53 Figure 3- 22: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG A Soils................................................................................................ 54 Figure 3- 23: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG B Soils................................................................................................ 54 Figure 3- 24: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG C Soils................................................................................................ 55 Figure 3- 25: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG D Soils................................................................................................ 55 Figure 3- 26: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG A Soils................................................................................................ 56 Figure 3- 27: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG B Soils................................................................................................ 57 Figure 3- 28: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG C Soils................................................................................................ 57 Figure 3- 29: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG D Soils................................................................................................ 58 Figure 3- 30: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG A Soils................................................................................................. 59 Figure 3- 31: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG B Soils................................................................................................. 59 Page 2 of 67 Appendix F Attachment 3 Figure 3- 32: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG C Soils................................................................................................. 60 Figure 3- 33: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG D Soils................................................................................................. 60 Figure 3- 34: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG A Soils................................................................................................ 61 Figure 3- 35: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG B Soils................................................................................................ 62 Figure 3- 36: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG C Soils................................................................................................ 62 Figure 3- 37: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG D Soils................................................................................................ 63 Figure 3- 38: Impervious Area Disconnection Performance Curves ............................................ 64 Page 3 of 67 Appendix F Attachment 3 Methods to Calculate Phosphorus Load Reductions for Structural Stormwater Best Management Practices in the Watershed This attachment provides methods to determine design storage volume capacities and to calculate phosphorus load reductions for the following structural Best Management Practices (structural BMPs) for a Watershed: 1) Infiltration Trench; 2) Infiltration Basin or other surface infiltration practice; 3) Bio-filtration Practice; 4) Gravel Wetland System; 5) Porous Pavement; 6) Wet Pond or wet detention basin; 7) Dry Pond or detention basin; and 8) Dry Water Quality Swale/ Grass Swale. Additionally, this attachment provides methods to design and quantify associated phosphorus load reduction credits for the following four types of semi-structural/non-structural BMPs 9) Impervious Area Disconnection through Storage (e.g., rain barrels, cisterns, etc); 10) Impervious Area Disconnection; 11) Conversions of Impervious Area to Permeable Pervious Area; and 12) Soil Amendments to Enhance Permeability of Pervious Areas. Methods and examples are provided in this Attachment to calculate phosphorus load reductions for structural BMPs for the four following purposes: 1) To determine the design volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area is 100% impervious; 2) To determine the phosphorus load reduction for a structural BMP with a known design volume when the contributing drainage area is 100% impervious; 3) To determine the design volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area has impervious and pervious surfaces; and 4) To determine the phosphorus load reduction for a structural BMP with a known design volume when the contributing drainage area has impervious and pervious surfaces. Examples are also provided for estimating phosphorus load reductions associated with the four semi-structural/non-structural BMPs. Also, this attachment provides the methodology for calculating the annual stormwater phosphorus load that will be delivered to BMPs for treatment (BMP Load) and to be used for quantifying phosphorus load reduction credits. The methods and annual phosphorus export load rates presented in this attachment are for the purpose of counting load reductions for various BMPs treating storm water runoff from varying site conditions (i.e., impervious or pervious surfaces) and different land uses (e.g. commercial and industrial). The estimates of annual phosphorus load and load reductions by BMPs are to demonstrate compliance with the permittee's Phosphorus Reduction Requirement under the permit. Page 4 of 67 Appendix F Attachment 3 Structural BMP performance credits: For each structural BMP type identified above (BMPs 1-8), long-term cumulative performance information is provided to calculate phosphorus load reductions or to determine needed design storage volumes to achieve a specified reduction target (e.g., 65% phosphorus load reduction). The performance information is expressed as cumulative phosphorus load removed (% removed) depending on the physical storage capacity of the structural BMP (expressed as inches of runoff from impervious area) and is provided at the end of this Attachment (see Tables 3-1 through 3-18 and performance curves Figures 3-1 through 3- 17). Multiple tables and performance curves are provided for the infiltration practices to represent cumulative phosphorus load reduction performance for six infiltration rates (IR), 0.17, 0.27, 0.53, 1.02, 2.41, and 8.27 inches/hour. These infiltration rates represent the saturated hydraulic conductivity of the soils. The permittee may use the performance curves provided in this attachment to interpolate phosphorus load removal reductions for field measured infiltration rates that are different than the infiltration rates used to develop the performance curves. Otherwise, the permittee shall use the performance curve for the IR that is nearest, but less than, the field measured rate. Physical storage capacity equals the total physical storage volume of the control structure to contain water at any instant in time. Typically, this storage capacity is comprised of the surface ponding storage volume prior to overflow and subsurface storage volumes in storage units and pore spaces of coarse filter media. Table 3-30 provides the formulae to calculate physical storage capacities for the structural control types for using the performance curves. Semi-Structural/Non-structural BMP performance credits: For each semi-structural/non- structural BMP type identified above (BMPs 9-12), long-term cumulative performance information is provided to calculate phosphorus load reductions or to determine needed design specifications to achieve a desired reduction target (e.g., 50% phosphorus load reduction). The performance information is expressed as cumulative runoff volume reduction (% removed) depending on the design specifics and actual field conditions. Cumulative percent runoff volume reduction is being used to estimate the cumulative phosphorus load reduction credit for these BMPs. To represent a wide range of potential conditions for implementing these types of BMPs, numerous performance tables and curves have been developed to reflect a wide range of potential conditions and designs such as varying storage volumes (expressed in terms of varying ratios of storage volume to impervious area (0.1 to 2.0 inches)); varying ratios of impervious source area to receiving pervious area based on hydrologic soil groups (HSGs) A, B, C and D (8:1, 6:1, 4:1, 2: 1 and 1: 1); and varying discharge time periods for temporary storage (1, 2 or 3 days) . The default credits are provided at the end of this Attachment (see Tables 3-19 through 3-26 and performance curves Figures 3-18 through 3-38). EPA will consider phosphorus load reductions calculated using the methods provided below to be valid for the purpose of complying with the terms of this permit for BMPs that have not been explicitly modeled if the desired BMP has functionality that is similar to one of the simulated BMP types. Please note that only the surface infiltration and the infiltration trench BMP types were simulated to direct storm water runoff into the ground (i.e., infiltration). All of the other simulated BMPs represent practices that have either under -drains or impermeable liners and therefore, are not hydraulically connected to the sub -surface soils (i.e., no infiltration). Following are some simple guidelines for selecting the BMP type and/or determining whether the results of any of the BMP types provided are appropriate for another BMP of interest. Page 5 of 67 Appendix F Attachment 3 Infiltration Trench is a practice that provides temporary storage of runoff using the void spaces within the soil/sand/gravel mixture that is used to backfill the trench for subsequent infiltration into the surrounding sub -soils. Performance results for the infiltration trench can be used for all subsurface infiltration practices including systems that include pipes and/or chambers that provide temporary storage. Also, the results for this BMP type can be used for bio-retention systems that rely on infiltration when the majority of the temporary storage capacity is provided in the void spaces of the soil filter media and porous pavements that allow infiltration to occur. Surface Infiltration represents a practice that provides temporary surface storage of runoff (e.g., ponding) for subsequent infiltration into the ground. Appropriate practices for use of the surface infiltration performance estimates include infiltration basins, infiltration swales, rain gardens and bio-retention systems that rely on infiltration and provide the majority of storage capacity through surface-ponding. If an infiltration system includes both surface storage through ponding and a lessor storage volume within the void spaces of a coarse filter media, then the physical storage volume capacity used to determine the long-term cumulative phosphorus removal efficiency from the infiltration basin performance curves would be equal to the sum of the surface storage volume and the void space storage volume. General design specifications for various surface infiltration systems are provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2IChapter2 (http://www.mass.g_ov/eea/docs/dep/water/laws/i- thru-z/v2c2.pdf). Bio-filtration is a practice that provides temporary storage of runoff for filtering through an engineered soil media. The storage capacity is typically made of void spaces in the filter media and temporary ponding at the surface of the practice. Once the runoff has passed through the filter media it is collected by an under -drain pipe for discharge. The performance curve for this control practice assumes zero infiltration. If a filtration system has subsurface soils that are suitable for infiltration, then user should use the either performance curves for the infiltration trench or the infiltration basin depending on the predominance of storage volume made up by free standing storage or void space storage. Depending on the design of the filter media manufactured or packaged bio-filter systems such as tree box filters may be suitable for using the bio-filtration performance results. Design specifications for bio-filtration systems are provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2IChapter2 (htt2://www.mass.gov/eea/docs/dep/water/laws/i-thru-z/v2c2.pd . Gravel Wetland performance results should be used for practices that have been designed in accordance or share similar features with the design specifications for gravel wetland systems provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2IChapter2 (http://www.mass.gov/eea/docs/dep/water/laws/i-thru-z/v2c2.pdD. Porous Pavement performance results represent systems with an impermeable under -liner and an under -drain. If porous pavement systems do not have an impermeable under -liner so that filtered runoff can infiltrate into sub -soils then the performance results for an infiltration trench may be used for these systems. Design specifications for porous pavement systems are provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2/Chapter2 (http://www.mass. gov/eea/docs/dep/water/laws/i-thru-z/v2c2.pdf). Page 6 of 67 Appendix F Attachment 3 Extended Dry Detention Pond performance results should only be used for practices that have been designed in accordance with the design specifications for extended dry detention ponds provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2/Chapter2 (hllp://www.mass.gov/eea/docs/dep/water/laws/i-thru-z/v2c2.pdD Dry Water Quality Swale/ Grass Swale performance results should only be used for practices that have been designed in accordance with the design specifications for a water quality dry swale provided in the most recent version of the Massachusetts Stormwater Handbook, Volume 2/Chapter2 (hllp://www.mass.gov/eea/docs/dep/water/laws/i-thru-z/v2c2.pdf) Impervious Area Disconnection using Storage (e.g., rain barrels, cistern, etc) performance results are for collecting runoff volumes from impervious areas such as roof tops, providing temporary storage of runoff volume using rain barrels, cisterns or other storage containers, and discharging stored volume to adjacent permeable pervious surfaces over an extended period of time. Impervious Area Disconnection performance results are for diverting runoff volumes from impervious areas such as roadways, parking lots and roof tops, and discharging it to adjacent vegetated permeable surfaces that are of sufficient size with adequate soils to receive the runoff without causing negative impacts to adjacent down -gradient properties. Careful consideration must be given to the ratio of impervious area to the pervious area that will receive the discharge. Also, devices such as level spreaders to disperse the discharge and provide sheet flow should be employed whenever needed to increase recharge and avoid flow concentration and short circuiting through the pervious area. Soil testing is needed to classify the permeability of the receiving pervious area in terms of HSG. Conversion of Impervious Area to Permeable Pervious Area phosphorus load reduction credits are for replacing existing impervious surfaces (such as traditional pavements and buildings with roof tops) with permeable surfaces. To be eligible for credit, it is essential that the area previously covered with impervious surface be restored to provide natural or enhanced hydrologic functioning so that the surface is permeable. Sub -soils beneath pavements are typically highly compacted and will require reworking to loosen the soil and the possible addition of soil amendments to restore permeability. Soil testing is needed to classify the permeability (in terms of HSG) of the restored pervious area. Soil Amendments to Increase Permeability of Pervious Areas performance results are for the practice of improving the permeability of pervious areas through incorporation of soil amendments, tilling and establishing dense vegetation. This practice may be used to compliment other practices such as impervious area disconnection to improve overall performance and increase reduction credits earned. Soil testing is needed to classify the permeability (in terms of HSG) of the restored pervious area. Alternative Methods: Page 7 of 67 Appendix F Attachment 3 A permittee may propose alternative long-term cumulative performance information or alternative methods to calculate phosphorus load reductions for the structural BMPs identified above or for other structural BMPs not identified in this Attachment. EPA will consider alternative long-term cumulative performance information and alternative methods to calculate phosphorus load reductions for structural BMPs provided that the permittee provides EPA with adequate supporting documentation. At a minimum, the supporting documentation shall include: 1) Results of continuous BMP model simulations representing the structural BMP, using a verified BMP model and representative long-term (i.e., 10 years) climatic data including hourly rainfall data; 2) Supporting calculations and model documentation that justify use of the model, model input parameters, and the resulting cumulative phosphorus load reduction estimate; 3) If pollutant removal performance data are available for the specific BMP, model calibration results should be provided; and 4) Identification of references and sources of information that support the use of the alternative information and method. If EPA determines that the long-term cumulative phosphorus load reductions developed based on alternative information are not adequately supported, EPA will notify the permittee in writing, and the permittee may receive no phosphorus reduction credit other than a reduction credit calculated by the permittee using the default phosphorus reduction factors provided in this attachment for the identified practices. The permittee is required to submit to EPA valid phosphorus load reductions for structural BMPs in the watershed in accordance with the submission schedule requirements specified in the permit and Appendix F. Method to Calculate Annual Phosphorus Load Delivered to BMPs (BMP Load) The BMP Load is the annual phosphorus load from the drainage area to each proposed or existing BMP used by permittee to claim credit against its stormwater phosphorus load reduction requirement (i.e., Phosphorus Reduction Requirement). The BMP Load is the starting point from which the permittee calculates the reduction in phosphorus load achieved by each existing and proposed BMP. Examples are provided to illustrate use of the methods. Table 3-1 below provides annual phosphorus load export rates (PLERs) by land use category for impervious and pervious areas. The permittee shall select the land use category that most closely represents the actual use of the watershed. For pervious areas, if the hydrologic soil group (HSG) is known, use the appropriate value. If the HSG is not known, assume HSG C conditions for the phosphorus load export rate. For watersheds with institutional type uses, such as government properties, hospitals, and schools, the permittee shall use the commercial/industrial land use category for the purpose of calculating phosphorus loads. Table 3-2 provides a crosswalk table of land use codes between land use groups in Table 3-1 and the codes used by MassGIS. Page 8 of 67 Appendix F Attachment 3 BMP Load: To estimate the annual phosphorus load reduction that a storm water BMP can achieve, it is first necessary to estimate the amount of annual phosphorus load that the BMP will receive or treat (BMP Load). For a given BMP: 1) Determine the total drainage area to the BMP; 2) Distribute the total drainage area into impervious and pervious subareas by land use category as defined by Tables 3-1 and 3-2; 3) Calculate the phosphorus load for each land use -based impervious and pervious subarea by multiplying the subarea by the appropriate phosphorus load export rate provided in Table 3-1; and 4) Determine the total annual phosphorus load to the BMP by summing the calculated impervious and pervious subarea phosphorus loads. Example 3-1 to determine phosphorus load to a proposed BMP: A permittee is proposing a surface stormwater infiltration system that will treat runoff from an industrial site with an area of 12.87 acres (5.21 hectares) and is made up of 10.13 acres of impervious cover (e.g., roadways, parking areas and rooftops), 1.85 acres of landscaped pervious area and 0.89 acres of wooded area both with HSG C soils. The drainage area information for the proposed BMP is: BMP Subarea ID Land Use Category Cover Type Area (acres) P export rate (lb/acre/yr)* 1 Industrial impervious 10.13 1.78 2 Landscaped (HSG C) pervious 1.85 0.21 3 Forest (HSG C) pervious 0.89 0.12 *From Table 3-1 The phosphorus load to the proposed BMP (BMP Load) is calculated as: BMP Load = (IAInd x PLERF,d) + (PAF,d x PLERInd) + (PAFoxEST x PLERFor) =(10.13 x 1.78)+(1.85 x 0.21) + (0.89 x 0.12) =18.531bs P/year Page 9 of 67 Appendix F Attachment 3 Table 3-1: Average annual distinct phosphorus load (P Load) export rates for use in estimating phosphorus load reduction credits the MA MS4 Permit Phosphorus Source Land Surface P Load Export P Load Export Category by Land Use Cover Rate, lbs/acre/year Rate, kg/ha/yr Directly connected 1.78 2.0 Commercial (Com) and impervious Industrial (Ind) Pervious See* DevPERV See* DevPERV Multi -Family (MFR) and Directly connected 2.32 2.6 High -Density Residential impervious Pervious See* DevPERV See* DevPERV (HDR) Medium -Density Directly connected 1.96 2.2 Residential (MDR) impervious Pervious See* DevPERV See* DevPERV Low Density Residential Directly connected 1.52 1.7 (LDR) - "Rural" impervious Pervious See* DevPERV See* DevPERV Directly connected 1.34 1.5 Highway (HWY) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Forest (For) impervious Pervious 0.13 0.13 Directly connected 1.52 1.7 Open Land (Open) impervious Pervious See* DevPERV See* DevPERV Directly connected 1.52 1.7 Agriculture (Ag) impervious Pervious 0.45 0.5 *Developed Land Pervious (DevPERV)- Hydrologic Pervious 0.03 0.03 Soil Group A *Developed Land Pervious (DevPERV)- Hydrologic Pervious 0.12 0.13 Soil Group B *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.21 0.24 Soil Group C *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.29 0.33 Soil Group C/D *Developed Land Pervious (DevPERV) - Hydrologic Pervious 0.37 0.41 Soil Group D Page 10 of 67 Appendix F Attachment 3 Table 3- 2: MassGIS land -use categories with associated land -use groups for phosphorus load calculations Mass GIS Land Use LU_CODE Description Land Use group for calculating P Load - 2013/14 MA MS4 1 Crop Land Agriculture 2 Pasture (active) Agriculture 3 Forest Forest 4 Wetland Forest 5 Mining Industrial 6 Open Land includes inactive pasture open land 7 Participation Recreation open land 8 spectator recreation open land 9 Water Based Recreation open land 10 Multi -Family Residential High Density Residential 11 High Density Residential High Density Residential 12 Medium Density Residential Medium Density Residential 13 Low Density Residential Low Density Residential 14 Saltwater Wetland Water 15 Commercial Commercial 16 Industrial Industrial 17 Urban Open open land 18 Transportation Highway 19 Waste Disposal Industrial 20 Water Water 23 cranberry bog Agriculture 24 Powerline open land 25 Saltwater Sandy Beach open land 26 Golf Course Agriculture 29 Marina Commercial 31 Urban Public Commercial 34 Cemetery open land 35 Orchard Forest 36 Nursery Agriculture 37 Forested Wetland Forest 38 Very Low Density residential Low Density Residential 39 Junkyards Industrial 40 Brush land/Successional Forest (1) Method to determine the design volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area is 100% impervious: Page 11 of 67 Appendix F Attachment 3 Flow Chart 1 illustrates the steps to determine the design volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area is 100% impervious. .,tart 1. Determine desired P load reduction target (PT., -get) in percentage 2. Identify contributing impervious drainage 3. Determine BMP type Yes Infiltration Identify Identify infiltration rate for BMP No 4. Use BMP performance curve to determine BMP storage volume needed (BMP-VolumerA-Z„) in inches of impervious surface runoff 5. Convert BMP storage volume into cubic ft (BMP-VolumeiAft3) 6. Demonstrate that the proposed BMP provides a storage volume of BMP-VolumelA_ft3 7. Calculate the cumulative P load reduction by the proposed BMP (BMP-Reductionlbs_p) in lbs Page 12 of 67 Appendix F Attachment 3 Flow Chart 1: Method to determine BMP design volume to achieve a known phosphorous load reduction when contributing drainage area is 100% impervious. 1) Determine the desired cumulative phosphorus load reduction target (P target) in percentage for the structural BMP; 2) Determine the contributing impervious drainage area (IA) in acres to the structural BMP; 3) Determine the structural BMP type (e.g., infiltration trench, gravel wetland). For infiltration systems, determine the appropriate infiltration rate for the location of the BMP in the Watershed; 4) Using the cumulative phosphorus removal performance curve for the selected structural BMP (Figures 3-1 through 3-18), determine the storage volume for the BMP (BMP- Volume IA -in), in inches of runoff, needed to treat runoff from the contributing IA to achieve the reduction target; 5) Calculate the corresponding BMP storage volume in cubic feet (BMP-Volume IA-ft3) using BMP-Volume IA -in determined from step 4 and equation 3-1: BMP-Volume IA_ft3 = IA (acre) x BMP-Volume IA -in x 3630 ft3/ac-in (Equation 3-1) 6) Provide supporting calculations using the dimensions and specifications of the proposed structural BMP showing that the necessary storage volume, BMP-Volume IA_ft3, determined from step 5 will be provided to achieve the P Target; and 7) Calculate the cumulative phosphorus load reduction in pounds of phosphorus (BMP- Reduction Ibs-P) for the structural BMP using the BMP Load (as calculated from the procedure in Attachment 1 to Appendix F) and P target by using equation 3-2: BMP-Reduction Ibs-P = BMP Load x (P target /100) (Equation 3-2) Example 3-2 to determine design volume of a structural BMP with a 100% impervious drainage area to achieve a known phosphorus load reduction target: A permittee is considering a surface infiltration practice to capture and treat runoff from 2.57 acres (1.04 ha) of commercial impervious area that will achieve a 70% reduction in annual phosphorus load. The infiltration practice would be located adjacent to the impervious area. The permittee has measured an infiltration rate (IR) of 0.39 inches per hour (in/hr) in the vicinity of the proposed infiltration practice. Determine the: A) Design storage volume needed for an surface infiltration practice to achieve a 70% reduction in annual phosphorus load from the contributing drainage area (BMP-Volume IA-ft3); and B) Cumulative phosphorus reduction in pounds that would be accomplished by the BMP (BMP-Reduction ibs-P) Solution: 1) Contributing impervious drainages area (IA) 2.57 acres Page 13 of 67 Appendix F Attachment 3 BMP type is a surface infiltration practice (i.e., basin) with an infiltration rate (IR) of 0.39 in/hr Solution continued: 3) Phosphorus load reduction target (P target) = 70% 4) The performance curve for the infiltration basin (i.e., surface infiltration practice), Figure 3-8, IR = 0.27 in/hr is used to determine the design storage volume of the BMP (BMP- Volume lain) needed to treat runoff from the contributing IA and achieve a P target = 70%. The curve for an infiltration rate of 0.27 in/hr is chosen because 0.27 in/hr is the nearest simulated IR that is less than the field measured IR of 0.39 in/hr. From Figure 3-8, the BMP- Vnliima — ._ fnr a P = 7tlo/ is t) 2ti in 5) The BMP-Volume IA -in is converted to cubic feet (BMP-Volume iA_ft3) using Equation 3- 1: BMP-Volume IA-ft3 = IA (acre) x BMP-Volume lain x 3,630 ft3/acre-in BMP-Volume IA-ft3 = 2.57 acre x 0.36 in x 3,630 ft3/acre-in = 3,359 ft3 6) A narrow trapezoidal infiltration basin with the following characteristics is proposed to achieve the P Target of 70%: Length (ft) Design Side Slopes Bottom area Pond surface Design Depth (ft) (ft) area (ft) Storage Volume (ft) 355 1.25 3:1 1,387 4,059 3,404 The volume of the proposed infiltration practice, 3,404 ft3, exceeds the BMP-Volume IA_ft3 needed, 3,359 ft3 and is sufficient to achieve the P Target of 70%. 7) The cumulative phosphorus load reduction in pounds of phosphorus for the infiltration practice (BMP-Reduction ibs-P) is calculated using Equation 3-2. The BMP Load is first determined using the method described above. BMP Load = IA x impervious cover phosphorus export loading rate for commercial use (see Table 3-1) = 2.57 acres x 1.78 lbs/acre/yr = 4.58lbs/yr BMP-Reduction lbs-P = BMP Load x (P target /100) BMP-Reduction lbs-P = 4.58 lbs/yr x (70/100) = 2 'fl the/vr Alternate Solution: Alternatively, the permittee could determine the design storage volume needed for an IR = 0.39 in/hr by performing interpolation of the results from the surface Page 14 of 67 Appendix F Attachment 3 infiltration performance curves for IR = 0.27 in/hr and IR = 0.52 in/hr as follows (replacing steps 3 and 4 on the Alternate solution continued: Using the performance curves for the infiltration basin (i.e., surface infiltration practice), Figures 3-8, IR = 0.27 in/hr and 3-9, IR = 0.52 in/hr, interpolate between the curves to determine the design storage volume of the BMP (BMP-Volume IA -in) needed to treat runoff from the contributing IA and achieve a P target = 70%. First calculate the interpolation adjustment factor (IAF) to interpolate between the infiltration basin performance curves for infiltration rates of 0.27 and 0.52 in/hr: IAF = (0.39 - 0.27)/ (0.52 — 0.27) = 0.48 From the two performance curves, develop the following table to estimate the general magnitude of the needed storage volume for an infiltration swale with an IR = 0.39 in/hr and a P target of 70%. Table Example 3-1-1: Interpolation Table for determining design storage volume of infiltration basin with IR = 0.39 in/hr and a phosphorus load reduction target of 70% BMP % Phosphorus Load % Phosphorus Load Interpolated % Phosphorus Load Storage Reduction IR = 0.27 in/hr Reduction IR = 0.52 in/hr Reduction IR = 0.39 irift (PRIR=o.39) Volume (PRIR=0.27) (PRiR=0.52) PR,R=039= IAF(PR,R-osz — PRIR=o.z,) + PRIR=o.n 0.3 64% 67% 65% 0.4 74% 77% 75% 0.5 79% 82% 80% As indicated from Table Example 3-1, the BMP-Volume IA -in for PRIR=0.39 of 70% is between 0.3 and 0.4 inches and can be determined by interpolation: BMP-Volume IA -in = (70% - 65%)/ (75% - 65%) x (0.4 in — 0.3 in) + 0.3 in = 0.35 inches 5 alternative) Convert the resulting BMP-Volume IA -in to cubic feet (BMP-Volume IA-83) using equation 3-1: BMP-Volume IA-rt3 = 2.57 acre x 0.35 in x 3,630 ft3/acre-in = 3,265 ft3 (2) Method to determine the phosphorus load reduction for a structural BMP with a known design volume when the contributing drainage area is 100% impervious: Flow Chart 2 illustrates the steps to determine the phosphorus load reduction for a structural BMP with a known design volume when the contributing drainage area is 100% impervious. Page 15 of 67 Appendix F Attachment 3 1. Determine BMP type and identify contributing impervious drainage area 2. Calculate available BMP storage volume (BMP-Volumeft3) in cubic ft 3. Convert BMP storage volume into runoff from contributing impervious areas (BMP-IVolumelA_„,) in inches 4. Use BMP performance curve to determine the percentage of P load reduction 5. Calculate the cumulative P load reduction by the proposed BMP (BMP-Reductionrbs-r) in Flow Chart 2: Method to determine the phosphorus load reduction for a BMP with a known design volume when contributing drainage area is 100% impervious. 1) Identify the structural BMP type and contributing impervious drainage area (IA); 2) Document the available storage volume (ft) of the structural BMP (BMP-Volume ft) using the BMP dimensions and design specifications (e.g., maximum storage depth, filter media porosity); 3) Convert BMP-Volume ft3 into inches of runoff from the contributing impervious area (BMP-Volume Ia_i„) using equation 3-3: BMP-Volume rain = BMP-Volume ft3/ IA (acre) x 12 in/ft x 1 acre/43560 ft2 (Equation 3-3) 4) Determine the % phosphorus load reduction for the structural BMP (BMP Reduction %-P) using the appropriate BMP performance curve (Figures 3-1 through 3-18) and the BMP- Volume rain calculated in step 3; and Page 16 of 67 Appendix F Attachment 3 5) Calculate the cumulative phosphorus load reduction in pounds of phosphorus for the structural BMP (BMP Reduction ibs_P) using the BMP Load as calculated from the procedure described above and the percent phosphorus load reduction determined in step 4 by using equation 3-4: BMP Reduction ibs_P = BMP Load x (BMP Reduction %-P/100) (Equation 3-4) Example 3-2: Determine the phosphorus load reduction for a structural BMP with a known storage volume capacity when the contributing drainage area is 100% impervious: A permittee is considering a bio-filtration system to treat runoff from 1.49 acres of high density residential (HDR) impervious area. Site constraints would limit the bio-filtration system to have a surface area of 1200 ft2 and the system would have to be located next to the impervious drainage area to be treated. The design parameters for the bio-filtration system are presented in Table Example 3-2-1. Table Example 3-2-1: Design parameters for bio-filtration system for Example 3-2 Components of representation Parameters Value Ponding Maximum depth 0.5 ft Surface area 1200 ft2 Vegetative parametera 85-95% Soil mix Depth 2.5 ft Porosity 0.40 Hydraulic conductivity 4 inches/hour Gravel layer Depth 0.67 ft Porosity 0.40 Hydraulic conductivity 14 inches/hour Orifice #1 Diameter 0.5 ft a Refers to the percentage of surface covered with vegetation Determine the: A) Percent phosphorus load reduction (BMP Reduction %-P) for the specified bio-filtration system and contributing impervious drainage area; and B) Cumulative phosphorus reduction in pounds that would be accomplished by the bio- filtration system (BMP-Reduction ibs-P) Solution: 1) The BMP is a bio-filtration system that will treat runoff from 1.49 acres of impervious area (IA = 1.49 acre); 2) The available storage volume capacity (ft) of the bio-filtraton system (BMP-Volume BMP-ft 3) is determined using the surface area of the system, depth of ponding, and the porosity of the filter media: BMP-Volume BMP-ft3 = (surface area x pond maximum depth) + ((soil mix depth + gravel layer depth)/12 in/ft) x surface area x gravel layer porosity) _ (1,200 ft2 x 0.5 ft) + ((38/12) x 1,200 ft2 x 0.4) = 2,120 ft' Page 17 of 67 Appendix F Attachment 3 Solution continued: 3) The available storage volume capacity of the bio-filtration system in inches of runoff from the contributing impervious area (BMP-Volume Ia_in) is calculated using equation 3- 3: BMP-Volume IA -in = (BMP-Volume ft3/ IA (acre) x 12 in/ft x 1 acre/43560 ft2 BMP-Volume IA -in = (2120 ft3/1.49 acre) x 12 in/ft x 1 acre/43560 ft2 = 0.39 in 4) Using the bio-filtration performance curve shown in Figure 3-13, a 51% phosphorus load reduction (BMP Reduction %-P) is determined for a bio-filtration system sized for 0.39 in of runoff from 1.49 acres of impervious area; and 5) Calculate the cumulative phosphorus load reduction in pounds of phosphorus for the bio- filtration system (BMP Reduction ibs-P) using the BMP Load as calculated from the procedure described above and the BMP Reduction %-P determined in step 4 by using equation 3-4. First, the BMP Load is determined as specified above: BMP Load = IA x impervious cover phosphorus export loading rate for HDR (see Table 3-1) = 1.49 acres x 2.32 lbs/acre/yr = 3.46lbs/yr BMP Reduction lbs-P = BMP Load x (BMP Reduction %-P/100) BMP Reduction ibs-P = 3.46 lbs/yr x (511100) (3) Method to determine the design storage volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area has impervious and pervious surfaces: Flow Chart 3 illustrates the steps to determine the design storage volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area has impervious and pervious surfaces. Page 18 of 67 Appendix F Attachment 3 Start 1. Determine desired P load reduction target (PT,,g,t) in percentage 2. Identify contributing impervious drainage area (IA) and pervious drainage area (PA) 3. Determine BMP type Identify infiltration 7>Y—" Infiltration �, rate for BMP No 4. Use BMP performance curve to determine BMP storage volume needed (BMP-Vo1umeI4-,,,) in inches of impervious surface runoff 5. Calculate runoff volume from all pervious surfaces (BMP-VolumePA ft3) for an event with the size of BMP-VolumeiA_,,, 6. Calculate total BMP storage volume needed for treating both impervious and pervious runoff in cubic ft (BMP-VolumerA&PA-O) 7. Demonstrate that the proposed BMP provides a storage volume of BMP-Vo1umerA&pA-ft3 8. Calculate the cumulative P load reductions by proposed BMP (BMP-Reductionu.,-P) in lbs Page 19 of 67 Appendix F Attachment 3 Flow Chart 3: Method to determine the design storage volume of a BMP to reach a known P load reduction when both impervious and pervious drainage areas are present. 1) Determine the desired cumulative phosphorus load reduction target (P target) in percentage for the structural BMP; 2) Characterize the contributing drainage area to the structural BMP by identifying the following information for the impervious and pervious surfaces: Impervious area (IA) - Area (acre) and land use (e.g., commercial) Pervious area (PA) - Area (acre) and runoff depths based on hydrologic soil group (HSG) and rainfall depth. Table 3-3 provides values of runoff depth from pervious areas for various rainfall depths and HSGs. Soils are assigned to an HSG on the basis of their permeability. HSG A is the most permeable, and HSG D is the least permeable. HSG categories for pervious areas in the drainage area shall be estimated by consulting local soil surveys prepared by the National Resource Conservation Service (NRCS) or by a storm water professional evaluating soil testing results from the drainage area. If the HSG condition is not known, a HSG D soil condition should be assumed. Table 3- 3: Developed Land Pervious Area Runoff Depths based on Precipitation depth and Hydrological Soil Groups (HSGs) Developed Land Pervious Area Runoff Depths based on Precipitation depth and Hydrological Soil Groups Runoff Depth, inches Rainfall Depth, Inches Pervious HSG A Pervious HSG B Pervious HSG C Pervious HSG C/D Pervious HSG D 0.10 0.00 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.01 0.02 0.02 0.40 0.00 0.00 0.03 0.05 0.06 0.50 0.00 0.01 0.05 0.07 0.09 0.60 0.01 0.02 0.06 0.09 0.11 0.80 0.02 0.03 0.09 0.13 0.16 1.00 0.03 0.04 0.12 0.17 0.21 1.20 0.04 0.05 0.14 0.27 0.39 1.50 0.08 0.11 0.39 0.55 0.72 2.00 0.14 0.22 0.69 0.89 1.08 Notes: Runoff depths derived from combination of volumetric runoff coefficients from Table 5 of Small Storm Hydrology and Why it is Important for the Design of Stormwater Control Practices, (Pitt, 1999), and using the Stormwater Management Model (SWMM) in continuous model mode for hourly precipitation data for Boston, MA, 1998-2002. 3) Determine the structural BMP type (e.g., infiltration trench, gravel wetland). For infiltration systems, determine the appropriate infiltration rate for the location of the BMP in the Watershed; 4) Using the cumulative phosphorus removal performance curve for the selected structural BMP, determine the storage volume capacity of the BMP in inches needed to treat runoff from the contributing impervious area (BMP-Volume IA -in); Page 20 of 67 Appendix F Attachment 3 5) Using Equation 3-5 below and the pervious area runoff depth information from Table 3- 3-1, determine the total volume of runoff from the contributing pervious drainage area in cubic feet (BMP Volume PA_ ft3) for a rainfall size equal to the sum of BMP Volume IA -in, determined in step 4. The runoff volume for each distinct pervious area must be determined; BMP-Volume PA ft3 = (PA x (runoff depth) x 3,630 ft3/acre-in) (PAI,... PA„ (Equation 3-5) 6) Using equation 3-6 below, calculate the BMP storage volume in cubic feet (BMP- Volume IA&PA-ft3) needed to treat the runoff depth from the contributing impervious (IA) and pervious areas (PA); BMP-Volume IA&PA413 = BMP Volume PA-ft3 + (BMP Volume IA -in x IA (acre) x 3,630 ft3/acre-in) (Equation 3-6) 7) Provide supporting calculations using the dimensions and specifications of the proposed structural BMP showing that the necessary storage volume determined in step 6, BMP- Volume IA&PA-ft3, will be provided to achieve the P Target; and 8) Calculate the cumulative phosphorus load reduction in pounds of phosphorus (BMP- Reduction lbs-P) for the structural BMP using the BMP Load (as calculated from the procedure in Attachment 1 to Appendix F) and the P target by using equation 3-2: BMP-Reduction ibs-P = BMP Load x (P target /100) (Equation 3-2) Example 3-3: Determine the design storage volume of a structural BMP to achieve a known phosphorus load reduction target when the contributing drainage area has impervious and pervious surfaces A permittee is considering a gravel wetland system to treat runoff from a high -density residential (HDR) site. The site is 7.50 acres of which 4.00 acres are impervious surfaces and 3.50 acres are pervious surfaces. The pervious area is made up of 2.5 acres of lawns in good condition surrounding cluster housing units and 1.00 acre of stable unmanaged woodland. Soils information indicates that all of the woodland and 0.50 acres of the lawn is hydrologic soil group (HSG) B and the other 2.00 acres of lawn are HSG C. The permittee wants to size the gravel wetland system to achieve a cumulative phosphorus load reduction (P Target) of 55% from the entire 7.50 acres. Determine the: A) Design storage volume needed for a gravel wetland system to achieve a 55% reduction in annual phosphorus load from the contributing drainage area (BMP-Volume IA&PA-ft3); and B) Cumulative phosphorus reduction in pounds that would be accomplished by the BMP (BMP-Reduction ibs-P) Page 21 of 67 Appendix F Attachment 3 Example 3-3 continued: Solution: 1) The BMP type is gravel wetland system. 2) The phosphorus load reduction target (P Target) = 55%. 3) Using the cumulative phosphorus removal performance curve for the gravel wetland system shown in Figure 3-14, the storage volume capacity in inches needed to treat runoff from the contributing impervious area (BMP Volume m-in) is 0.71 in; Using equation 3-5 and the pervious runoff depth information from Table 3-3, the volume of runoff from the contributing pervious drainage area in cubic feet (BMP Volume PA _ ft3) for a rainfall size equal to 0.71 in is summarized in Table Example 3-3-A. As indicated from Table 3-3, the runoff depth for a rainfall size equal to 0.71 inches is between 0.6 and 0.8 inches and can be determined by interpolation (example shown for runoff depth of HSG C): Runoff depth (HSG C) = (0.71 — 0.6)/(0.8 — 0.6) x (0.09 in — 0.06 in) + 0.06 in = 0.07 inches Table Example 3-3-A: Runoff contributions from pervious areas for HDR site Pervious HSG Runoff Runoff Runoff ID Type Area (in) _ (runoff) x PA = Runoff (acre -in) x 3630 (acre) (acre -in) ft3/ac3 -in (ft ) PA1 Grass 2.00 C 0.07 0.14 508 PA2 Grass 0.50 B 0.01 0.0 0.0 PA3 Woods 1.00 B 0.01 0.0 0.0 Total ----- 3.50 ----- ----- 0.14 508 4) Using equation 3-6, determine the BMP storage volume in cubic feet (BMP-Volume rA&PA-ft3) needed to treat 0.71 inches of runoff from the contributing impervious area (IA) and the runoff of 0.14 acre -in from the contributing pervious areas, determined in step 5 is: BMP VolumeIA&PA-ft3 = BMP Volume PA ac-in + (BMP Volume iA-in x IA (acre)) x 3,630 ft3/acre-in) BMP VolumeIA&PA-ft3 = (508 ft3+ (0.71 in x 4.00 acre)) x 3,630 ft3/acre-in = 10,817 ft3 5) Table Example 3-3-B provides design details for of a potential gravel wetland system Page 22 of 67 Appendix F Attachment 3 Solution continued: Table Example 3-3-B: Design details for gravel wetland system Gravel Wetland System Components Design Detail Depth (ft) Surface Area (ft2) Volume (ft3) Sediment Forebay 10% of Treatment Volume Pond area ---- 1.33 896 1,192 Wetland Cell #1 45% of Treatment Volume --------------- ------------------- --------------- Pond area ---- 2.00 1,914 3,828 Gravel layer porosity = 0.4 2.00 1,914 1,531 Wetland Cell #2 45% of Treatment Volume --------------- ------------------ --------------- Pond area ---- 2.00 1,914 3,828 Gravel layer porosity = 0.4 2.00 1,914 1,531 The total design storage volume for the proposed gravel wetland system identified in Table Example 3-3-C is 11,910 ft3. This volume is greater than 11,834 ft3 ((BMP- Volume IA&PA-ft3), calculated in step 6) and is therefore sufficient to achieve a P Target of 55%. 6) The cumulative phosphorus load reduction in pounds of phosphorus (BMP- Reduction ibs-P) for the proposed gravel wetland system is calculated by using equation 3- 2 with the BMP Load and the P target= 55%. BMP-Reduction lbs-P = BMP Load x (P target /100) (Equation 3-2) Using Table 3-1, the BMP Load is calculated: BMP Load = (IA x PLER xDR) + (PA lawn HSG B x PLER HSG B) + (PA lawn HSG C x PLER HSG C) +(PA forest x PA PLER For) = (4.00 acre x 2.32 lbs/acre/yr) + (0.50 acres x 0.12 lbs/acre/yr) + (1.00 acre x 0.21 lbs/acre/yr) + (1.00 acres x 0.13) = 9.68lbs/yr BMP-Reduction lbs-P = BMP Load x (P target /100) BMP-Reduction lbs-P = 9.68 lbs/yr x 551100 = 5.32 lbs/yr (4) Method to determine the phosphorus load reduction for a structural BMP with a known storage volume when the contributing drainage area has impervious and pervious surfaces: Flow Chart 4 illustrates the steps to determine the phosphorus load reduction for a structural BMP with a known storage volume when the contributing drainage area has impervious and pervious surfaces. Page 23 of 67 Appendix F Attachment 3 Start 1. Determine BMP type and identify contributing impervious drainage area (IA) and pervious drainage area (PA) in acres 2. Calculate available BMP storage volume (BMP- Volumeft3) in cubic ft 3. Convert BMP storage volume into runoff from contributing impervious area (BMP-VolumerA-t„) in inches 4. Calculate runoff volume from all pervious surfaces (BMP-VolumePA ft3) in cubic ft for an event with the size of BMP-VolumerA-t„ 5. Calculate BMP volume available for treating only impervious runoff by subtracting BMP-VolumePAft3 from BMP-Volumeft3, and convert BMP volume into inches of impervious surface runoff (BMP-Volume(rA_Z„)a) 6. Calculate percentage of differences between BMP-VolumegA- ;,ffa and BMP-VolumerA_Z,, Yes 7. Use BMP performance curve to determine the percentage of P load 8. Calculate the cumulative P load reductions by proposed BMP (BMP-Reductionib,p) in lbs Update the value of BMP-VolumelA_,,, with that of BMP- Volume(rA_t„)a No Less than CO/ n Page 24 of 67 Appendix F Attachment 3 Flow Chart 4: Method to determine the phosphorus load reduction for a BMP with known storage volume when both pervious and impervious drainage areas are present. 1) Identify the type of structural BMP and characterize the contributing drainage area to the structural BMP by identifying the following information for the impervious and pervious surfaces: Impervious area (IA) — Area (acre) and land use (e.g., commercial) Pervious area (PA) — Area (acre) and runoff depth based on hydrologic soil group (HSG) and size of rainfall event. Table 3-3 provides values of runoff depth for various rainfall depths and HSGs. Soils are assigned to an HSG based on their permeability. HSG categories for pervious areas in the Watershed shall be estimated by consulting local soil surveys prepared by the National Resource Conservation Service (MRCS) or by a storm water professional evaluating soil testing results from the Watershed. If the HSG condition is not known, a HSG C/D soil condition should be assumed. 2) Determine the available storage volume (ft) of the structural BMP (BMP-Volume ft3) using the BMP dimensions and design specifications (e.g., maximum storage depth, filter media porosity); 3) To estimate the phosphorus load reduction of a BMP with a known storage volume capacity, it is first necessary to determine the portion of available BMP storage capacity (BMP-Volume ft3) that would treat the runoff volume generated from the contributing impervious area (IA) for a rainfall event with a depth of i inches (in). This will require knowing the corresponding amount of runoff volume that would be generated from the contributing pervious area (PA) for the same rainfall event (depth of i inches). Using equation 3-6a below, solve for the BMP capacity that would be available to treat runoff from the contributing imperious area for the unknown rainfall depth of i inches (see equation 3-6b): Where: BMP-Volume ft3 =BMP-Volume (IA_ft3)i +BMP-Volume (PA-ft3), (Equation 3-6a) BMP-Volume ft3= the available storage volume of the BMP; BMP-Volume (IA_ft3)i = the available storage volume of the BMP that would fully treat runoff generated from the contributing impervious area for a rainfall event of size i inches; and BMP-Volume (PA-ft3)i = the available storage volume of the BMP that would fully treat runoff generated from the contributing pervious area for a rainfall event of size i inches Solving for BMP-Volume (IA-ft3)i: Page 25 of 67 Appendix F Attachment 3 BMP-Volume (IA_ft3)i = BMP-Volume ft3 - BMP-Volume (PA_ft3)i (Equation 3-6b) To determine BMP-Volume (IA_ft3)i, requires performing an iterative process of refining estimates of the rainfall depth used to calculate runoff volumes until the rainfall depth used results in the sum of runoff volumes from the contributing IA and PA equaling the available BMP storage capacity (BMP-Volume ft). For the purpose of estimating BMP performance, it will be considered adequate when the IA runoff depth (in) is within 5% IA runoff depth used in the previous iteration. For the first iteration (1), convert the BMP-Volume ft3 determined in step 2 into inches of runoff from the contributing impervious area (BMP Volume (,A_in)I) using equation 3-7a. BMP-Volume (i,_in)I = (BMP-Volumeft3/ IA (acre)) x (12 in/ft /43,560 ft2/acre) (Equation 3-7a); For iterations 2 through n (2...n), convert the BMP Volume (v ft3)2...n, determined in step 5a below, into inches of runoff from the contributing impervious area (BMP Volume (IA_in)2... n) using equation 3-7b. BMP-Volume (IA-in)2 ... n = (BMP-Volume (IA-ft3)2... n / IA (acre)) x (12 in/ft /43,560 ft2/acre) (Equation 3-7b); 4) For 1 to n iterations, use the pervious runoff depth information from Table 3-3 and equation 3-8 to determine the total volume of runoff (ft) from the contributing PA (BMP Volume PA_ft3) for a rainfall size equal to the sum of BMP-Volume (IA-in)I, determined in step 3. The runoff volume for each distinct pervious area must be determined. BMP Volume (PA-ft3)I... n = ((PA x (runoff depth) (PaI, Pa2..Pan) x (3,630 ft3/acre-in) (Equation 3-8) 5) For iteration 1, estimate the portion of BMP Volume that is available to treat runoff from only the IA by subtracting BMP-Volume PA-ft3, determined in step 4, from BMP-Volume ft3, determined in step 2, and convert to inches of runoff from IA (see equations 3-9a and 3-9b): BMP-Volume (IA-ft3)2 = ((BMP-Volumeft3- BMP Volume (PA_ft3)I) (Equation 3-9a) BMP-Volume (IA-in)2 = (BMP-Volume (IA-ft3)2/IA (acre)) x (12 in/ft x 1 acre/43,560 ft2) (Equation 3-9b) If additional iterations (i.e., 2 through n) are needed, estimate the portion of BMP volume that is available to treat runoff from only the IA (BMP-Volume (IA-in)3..n+I) by subtracting BMP Volume (PA-ft3)2..n, determined in step 4, from BMP Volume (IA-ft3)3..n+I, determined in step 5, and by converting to inches of runoff from IA using equation 3-9b): Page 26 of 67 Appendix F Attachment 3 6) For iteration a (an iteration between 1 and n+1), compare BMP Volume (LA,_,,,)a to BMP Volume (1,_in)a-i determined from the previous iteration (a-1). If the difference in these values is greater than 5% of BMP Volume (Ip,_in)a then repeat steps 4 and 5, using BMP Volume (IA_in)a as the new starting value for the next iteration (a+1). If the difference is less than or equal to 5 % of BMP Volume (Ip,_in)a then the permittee may proceed to step 7; 7) Determine the % phosphorus load reduction for the structural BMP (BMP Reduction %-P) using the appropriate BMP performance curve and the BMP-Volume (IA-in)n calculated in the final iteration of step 5; and 8) Calculate the cumulative phosphorus load reduction in pounds of phosphorus for the structural BMP (BMP Reduction ibs-P) using the BMP Load as calculated from the procedure in Attachment 1 to Appendix F and the percent phosphorus load reduction (BMP Reduction %_P ) determined in step 7 by using equation 3-4: BMP Reduction ibs-P = BMP Load x (BMP Reduction %-p/100) (Equation 3-4) Example 3-4: Determine the phosphorus load reduction for a structural BMP with a known design volume when the contributing drainage area has impervious and pervious surfaces A permittee is considering an infiltration basin to capture and treat runoff from a portion of the medium density residential area (MDR). The contributing drainage area is 16.55 acres and has 11.75 acres of impervious area and 4.8 acres of pervious area (PA) made up mostly of lawns and landscaped areas that is 80% HSG D and 20% HSG C. An infiltration basin with the following specifications can be placed at the down -gradient end of the contributing drainage area where soil testing results indicates an infiltration rate (IR) of 0.28 in/hr: Table Example 3-4-A: Infiltration basin characteristics Bottom Top Maximum Design Infiltration Structure area surface pond depth storage Rate (acre) area (ft) volume (W) (in/hr) (acre) Infiltration basin 0.65 0.69 1.65 48,155 0.28 Determine the: A) Percent phosphorus load reduction (BMP Reduction %-P) for the specified infiltration basin and the contributing impervious and pervious drainage area; and B) Cumulative phosphorus reduction in pounds that would be accomplished by the BMP (BMP-Reduction Ibs-P) Page 27 of 67 Appendix r Attachment 3 Example continued: Solution: 1) A surface infiltration basin is being considered. Information for the contributing impervious (IA) and pervious (PA) areas are summarized in Tables Example 3-4-A and Example 34-13, respectively. Table Example 3-4-B: Impervious area characteristics ID Land use Area (acre) IA 1 MDR 11.75 Table Example 3-4-C: Pervious area characteristics ID Area Hydrologic (acre) Soil Group (HSG) PA1 3.84 D PA2 0.96 C 2) The available storage volume (ft3) of the infiltration basin (BMP-Volume ft) is determined from the design details and basin dimensions; BMP-Volume ft3 = 48,155 ft3. 3) To determine what the BMP design storage volume is in terms of runoff depth (in) from IA, an iterative process is undertaken: Solution Iteration 1 For the first iteration (1), the BMP-Volumeft3 is converted into inches of runoff from the contributing impervious area (BMP Volume (Ia_in)i) using equation 3-5a. BMP Volume (iA_in)i = (48,155 ft2/ 11.75 acre) x (12 in/ft /43,560 ft2/acre) = 1.13 in 4-1) The total volume of runoff (ft3) from the contributing PA (BMP Volume PA_ft3) for a rainfall size equal to the sum of BMP Volume determined in step 3 is determined for each distinct pervious area identified in Table Example 3-4-B using the information from Table 3-3 and equation 3-5. Interpolation was used to determine runoff depths. BMP Volume (PA-ft3)1 = ((3.84 acre x (0.33 in) + (0.96 acre x (0.13 in)) x 3,630 ft3/acre-in = 5052 ft3 5-1) For iteration 1, the portion of BMP Volume that is available to treat runoff from only the IA is estimated by subtracting the BMP Volume (PA-ft3)1, determined in step 4-1, from BMP Volumeft3, determined in step 2, and converted to inches of runoff from IA: BMP Volume (U_ft3) 2 = 48,155 ft3 — 5052 ft3 = 43,103 ft3 BMP Volume (M-in) 2 = (43,103 ft3/11.75 acre) x (12 in/ft x 1 acre/43,560 ft2) = 1.01 in Page 28 of 67 Appendix F Attachment 3 Solution continued: 6-1) The % difference between BMP Volume (IA -in) 2, 1.01 in, and BMP Volume (1A_in)I, 1.13 in is determined and found to be significantly greater than 5%: % Difference = ((1.13 in — 1.01 in)/1.01 in) x 100 = 12% Therefore, steps 4 through 6 are repeated starting with BMP Volume (IA -in) 2 = 1.01 in. Solution Iteration 2 4-2) BMP-Volume (PA_ft3)2 = ((3.84 acre x 0.21 in) + (0.96 acre x 0.12 in)) x 3,630 ft3/acre-in = 3,358 ft3 5-2) BMP-Volume (iA-ft3) 3 = 48,155 ft3 — 3,358 ft3 = 44,797 ft3 BMP-Volume (IA -in) 3 = (44,797 ft3/11.75 acre) x (12 in/ft x 1 acre/43,560 ft2) = 1.05 in 6-2) % Difference = ((1.05 in — 1.01 in)/l.05 in) x 100 = 4% The difference of 4% is acceptable. 7) The % phosphorus load reduction for the infiltration basin (BMP Reduction %-P) is determined by using the infiltration basin performance curve for an infiltration rate of 0.27 in/hr and the treatment volume (BMP-Volume Net IA -in = 1.05 in) calculated in step 5- 2 and is BMP Reduction Rio-P = 93%. The performance curve for IR = 0.27 is used rather than interpolating between the performance curves for IR = 0.27 in/hr and 0.52 in/hr to estimate performance for IR = 0.28 in/hr. An evaluation of the performance curves for IR = 0.27 in/hr and IR = 0.52 in/hr for a design storage volume of 1.05 in indicate a small difference in estimated performance (BMP Reduction %_P = 93 % for IR = 0.27 in/hr and BMP Reduction %_P = 95% for IR = 0.52 in/hr). 8) The cumulative phosphorus load reduction in pounds of phosphorus (BMP-Reduction ibs- P) for the proposed infiltration basin is calculated by using equation 3-2 with the BMP Load and the P target of 93%. BMP-Reduction ibs-P = BMP Load x (P target /100) (Equation 3-2) Using Table 3-1, the BMP load is calculated: BMP Load = (IA x impervious cover phosphorus export loading rate for industrial) + (PA HSG D x pervious cover phosphorus export loading rate for HSG D) + (PA IISG c x pervious cover phosphorus export loading rate for HSG Q Page 29 of 67 Appendix F Attachment 3 Solution continued: _ (11.75 acre x 1.96 lbs/acre/yr) + (3.84 acre x 0.37 lbs/acre/yr) + (0.96 acre x 0.21 lbs/acre/yr) = 24.65 lbs/yr BMP-Reduction Ibs_P = 24.22 lbs/yr x 93/100 22.93 lbs/yr Example 3-5: Determine the phosphorus load reduction for disconnecting impervious area using storage with delayed release. A commercial operation has an opportunity to divert runoff from 0.75 acres of impervious roof top to a 5000 gallon (668.4 ft3) storage tank for temporary storage and subsequent release to 0.09 acres of pervious area (PA) with HSG C soils. Determine the: A) Percent phosphorus load reduction rates (BMP Reduction %-P) for the specified impervious area (IA) disconnection and storage system assuming release times of 1, 2 and 3 days for the stored volumes to discharge to the pervious area; and B) Cumulative phosphorus reductions in pounds that would be accomplished by the system (BMP-Reduction ibs-P) for the three storage release times, 1, 2 and 3 days. Solution: 1. Determine the storage volume in units of inches of runoff depth from contributing impervious area: Storage Volume IA -in = (668.4 ft3/(0.75 acre x 43.560 ftZ/acre)) x 12 inch/ft = 0.25 inches 2. Determine the ratio of the contributing impervious area to the receiving pervious area: IA:PA = 0.75 acres/0.09 acres = 8.3 3. Using Table 3-21 for a IA:PA ratio of 8:1, determine the phosphorus load reduction rates for a storage volume of 0.25 inches that discharges to HSG C with release rates of 1, 2 and 3 days: Using interpolation the reduction rates are shown in Table 3-5-A: Table Example 3-5-A: Reduction Rates Percent Phosphorus load reduction for IA disconnection with storage HSG C Storage Volume IA -in Storage release rate, days 1 12 13 0.25 39% 42% 43% 4. The cumulative phosphorus load reduction in pounds of phosphorus for the IA disconnection with storage (BMP-Reduction ibs-P) is calculated using Equation 3-2. The BMP Load is first determined using the method described above. Page 30 of 67 Appendix F Attachment 3 Solution continued: BMP Load = IA x phosphorus export loading rate for commercial IA (see Table 3-1) = 0.75 acres x 1.78 lbs/acre/yr = 1.34 lbs/yr BMP Reduction lb,-P = BMP Load x (BMP Reduction %-P/100) BMP Reduction ib,-P = 1.34 lbs/yr x (39/100) = 0.53 lbs/yr Table Example 3-5-B presents the BMP Reduction ibs_P for each of the release rates: Table Example 3-5-13: Reduction Load Phosphorus load reduction for IA disconnection with storage HSG C, lbs Storage Volume IA -in Storage release rate, days 1 2 3 0.25 0.53 0.56 0.58 Example 3-6: Determine the phosphorus load reduction for disconnecting impervious area with and without soil augmentation in the receiving pervious area. The same commercial property as in example 3-5 wants to evaluate disconnecting drainage from the 0.75 acre impervious roof top and discharging it directly to 0.09 acres of pervious area (PA) with HSG C. Also, the property has the opportunity to purchase a small adjoining area (0.06 acres), also HSG C,to increase the size of the receiving PA from 0.09 to 0.15 acres and to allow the property owner to avoid having to install a drainage structure to capture overflow runoff from the PA. The property owner has been informed that the existing PA soil can be tilled and augmented with soil amendments to support denser vegetative growth and improve hydrologic function to approximate HSG B. Determine the: A) Percent phosphorus load reduction rates (BMP Reduction %-p) for the specified impervious area (IA) disconnection to both the 0.09 and 0.15 acre receiving PAs with and without soil augmentation; and B) Cumulative phosphorus reductions in pounds that would be accomplished by the IA disconnection for the various scenarios (BMP-Reduction ib,-P). Solution: 1. Determine the ratio of the contributing impervious area to the receiving pervious area: IA:PA = 0.75 acres/0.09 acres = 8.3 IA:PA = 0.75 acres/0.15 acres = 5.0 Page 31 of 67 Appendix F Attachment 3 Solution Continued: 2. Using Table 3-26 and Figure 3-40 for a IA:PA ratios of 8:1 and 5:1, respectively, determine the phosphorus load reduction rates for IA disconnections to HSG C and HSG B: Table Example 3-6-A: Reduction Rates Percent Phosphorus load reduction rates for IA disconnection Receiving PA IA:PA 8:1 5:1 HSG C 7% 14% HSG B (soil augmentation) 14% 22% 3. The cumulative phosphorus load reduction in pounds of phosphorus for the IA disconnection with storage (BMP-Reduction ibs-P) is calculated using Equation 3-2. The BMP Load was calculated in example 3-5 and is 1.34 lbs/yr. BMP Reduction lbs-P = BMP Load x (BMP Reduction %-P/100) For PA of 0.09 acres HSG C the BMP Reduction lbs-P is calculated as follows: BMP Reduction lbs-P(o.09ac- HSG Q = 1.34 lbs/yr x (7/100) = 0.09 lbs/yr Table Example 3-6-B presents the BMP Reduction lbs-P for each of the scenarios: Table Example 3-6-B: Reduction Pounds Phosphorus load reduction for IA disconnection, lbs/yr Area of Receiving PA Receiving PA, acres 0.09 0.15 HSG C 0.09 0.19 HSG B (soil augmentation) 0.19 0.29 Page 32 of 67 Appendix F Attachment 3 Example 3-7: Determine the phosphorus load reduction for converting impervious area to permeable/pervious area. A municipality is planning upcoming road reconstruction work in medium density residential (MDR) neighborhoods and has identified an opportunity to convert impervious surfaces to permeable/pervious surfaces by narrowing the road width of 3.7 miles (mi) of roadway from 32 feet (ft) to 28 ft and eliminating 3.2 miles of 4 ft wide paved sidewalk (currently there are sidewalks on both sides of the roadways targeted for restoration). The newly created permeable/pervious area will be tilled and treated with soil amendments to support vegetated growth in order to restore hydrologic function to at least HSG B. Determine the: A) Percent phosphorus load reduction rate (BMP Reduction %-P) for the conversion of impervious area (IA) to permeable/pervious area (PA); and B) Cumulative phosphorus reduction in pounds that would be accomplished by the project (BMP-Reduction lbs_P). Solution: Determine the area of IA to be converted to PA: New PA = (((3.7 mi x 4 ft) + (3.2 mi x 4 ft)) x 5280 ft/mi)/43,560 ft2/acre = 3.35 acres 2. Using Table 3-27, the phosphorus load reduction rate for converting IA to HSG B is 94.1 % 3. The BMP Load is first determined using the method described above. BMP Load = IA x phosphorus export loading rate for MDR IA (see Table 3-1) = 3.35 acres x 1.96 lbs/acre/yr = 6.57 lbs/yr 4. The cumulative phosphorus load reduction in pounds of phosphorus for the IA conversion (BMP-Reduction ibs-P) is calculated using Equation 3-2. BMP Reduction ibs-P = BMP Load x (BMP Reduction %-P/ 100) BMP Reduction ibs-P = 6.57 lbs/yr x (94.1/100) = 6.18 lbs/yr Page 33 of 67 Appendix F Attachment 3 Table 3- 4: Infiltration Trench (IR = 0.17 in/hr) BMP Performance Table Infiltration Trench (IR = 0.17 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 14.7% 27.6% 48.6% 64.1% 74.9% 82.0% 91.6% 95.4% Cumulative Phosphorus Load 18% 33% 57% 73% 83% 90% 97% 99% Reduction Figure 3- 1: BMP Performance Curve: Infiltration Trench (infiltration rate = 0.17 in/hr) BMP Performance Curve: Infiltration Trench (Soil infiltration rate 0.17 in/hr) 100% 100% 90% -41 90% i 80% '' 80% Air = 70% 70% _ > -00 0 60% 60% Q w 50% 50% c � S 40% 40% / 30% 30% p a 20% 20% 10% 10% 0% 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus --* -Volume Page 34 of 67 Appendix F Attachment 3 Table 3- 5: Infiltration Trench (IR = 0.27 in/hr) BMP Performance Table Infiltration Trench (IR = 0.27 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 17.8% 32.5% 55.0% 70.0% 79.3% 85.2% 93.3% 96.3% Cumulative Phosphorus Load 20% 37% 63% 78% 86% 92% 97% 99% Reduction [ure 3- 2: BMP Performance Curve: Infiltration Trench (infiltration rate = 0.27 in/hr BMP Performance Curve: Infiltration Trench (Soil infiltration rate 0.27 in/hr) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 100% 90% 80% c 70% v 60% 50% E 40% p 30% p c 20% 10% 0% ' 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 9 -Volume Page 35 of 67 Appendix F Attachment 3 Table 3- 6: Infiltration Trench (IR = 0.52 in/hr) BMP Performance Table Infiltration Trench (IR = 0.52 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 22.0% 38.5% 61.8% 75.7% 83.7% 88.8% 95.0% 97.2% Cumulative Phosphorus Load 23% 42% 68% 82% 89% 94% 98% 99% Reduction Figure 3- 3: BMP Performance Curve: Infiltration Trench BMP Performance Curve: Infiltration Trench (infiltration rate = 0.52 in/hr) 100% 90% 80% 70% c� E 60% m Q: 50 % c 40% a 30% 20% 10% n rate = 0.52 100% 90% 80% _ 70% v 60% 50% E 3 40% 30% c c 20% 10% 0% i 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 0 -Volume Page 36 of 67 Appendix F Attachment 3 Table 3- 7: Infiltration Trench (IR = 1.02 in/hr) BMP Performance Table Infiltration Trench (IR = 1.02 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 26.3% 44.6% 68.2% 81.0% 88.0% 92.1% 96.5% 98.3% Cumulative Phosphorus Load 27% 47% 73% 86% 92% 96% 99% 100% Reduction [ure 3- 4: BMP Performance Curve: Infiltration Trench (infiltration rate = 1.02 in/hr' BMP Performance Curve: Infiltration Trench (infiltration rate = 1.02 in/hr) 100% 90% 80% 70% c� 0 60% Q-' 50% c +a 40% a 30% 20% 100% 90% 80% c 70% v 60% 50% E 40% p 30% p c 20% 10% 10% 0% 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 9 -Volume Page 37 of 67 Appendix F Attachment 3 Table 3- 8: Infiltration Trench (IR = 2.41 in/hr) BMP Performance Table Infiltration Trench (IR = 2.41 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 34.0% 54.7% 78.3% 88.4% 93.4% 96.0% 98.8% 99.8% Cumulative Phosphorus Load 33% 55% 81 % 91 % 96% 98% 100% 100% Reduction Figure 3- 5: BMP Performance Curve: Infiltration Trench (infiltration rate = 2.41 100% 90% 80% 70% c� E 60% m �-' 50 % c 40% a 30% 20% 10% 0% 0.0 BMP Performance Curve: Infiltration Trench (infiltration rate = 2.41 in/hr) 100% 90% 80% _ 70% v 60% 50% E 3 40% 30% c c 20% 10% 0% 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 0 -Volume Page 38 of 67 Appendix F Attachment 3 Table 3- 9: Infiltration Trench (8.27 in/hr) BMP Performance Table Infiltration Trench (8.27 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 53.6% 76.1% 92.6% 97.2% 98.9% 99.5% 100.0% 100.0% Cumulative Phosphorus Load 50% 75% 94% 98% 99% 100% 100% 100% Reduction [ure 3- 6: BMP Performance Curve: Infiltration Trench (infiltration rate = 8.27 in/hr BMP Performance Curve: Infiltration Trench (infiltration rate = 8.27 in/hr) 100% 90% 80% 70% c� 0 60% m Q: 50% c +° 40% ao 30% 20% 10% 100% 90% 80% r_ 70% 60% 50% E 40% o 30% o 20% 10% 0% i 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus --* -Volume Page 39 of 67 Appendix F Attachment 3 Table 3- 10: Infiltration Basin (0.17 in/hr) BMP Performance Table Infiltration Basin (0.17 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 13.0% 24.6% 44.2% 59.5% 70.6% 78.1 % 89.2% 93.9% Cumulative Phosphorus Load 35% 52% 72% 82% 88% 92% 97% 99% Reduction we 3- 7: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.17 in/hr' 100% 90% 80% 70% 0 60% 50% c 40% a 30% 20% 10% BMP Performance Curve: Infiltration Basin (infiltration rate = 0.17 in/hr) 40 i i 0% 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 0 -Volume 100% 90% 80% c 70% v 60% 50% E 40% 30% C c 20% 10% Page 40 of 67 Appendix F Attachment 3 Table 3- 11: Infiltration Basin (0.27 in/hr) BMP Performance Table Infiltration Basin (0.27 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 16.3% 29.8% 51.0% 66.0% 76.0% 82.4% 91.5% 95.2% Cumulative Phosphorus Load 37% 54% 74 % 85% 90% 93% 98% 99% Reduction we 3- 8: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.27 in/hr' BMP Performance Curve: Infiltration Basin (infiltration rate = 0.27 in/hr) 100% 90% 80% 70% 0 60% a' 50% c 40% 0 30% 20% 10% 100% 90% 80% c 70% v 60% y 50% E 40% p 30% c c 20% 10% 0 %0 % 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus --* -Volume Page 41 of 67 Appendix F Attachment 3 Table 3- 12: Infiltration Basin (0.52 in/hr) BMP Performance Table Infiltration Basin (0.52 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 20.2% 35.6% 58.0% 72.6% 81.3% 86.9% 94.2% 96.7% Cumulative Phosphorus Load 38% 56% 77% 87% 92% 95% 98% 99% Reduction O E Q O a we 3- 9: BMP Performance Curve: Infiltration Basin (infiltration rate = 0.52 in/hr' BMP Performance Curve: Infiltration Basin (infiltration rate = 0.52 in/hr) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 100% 90% 80% c 70% O v 60% 50% E 40% p 30% G c 20% w 10% 0% '' ' 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 0 -Volume Page 42 of 67 Appendix F Attachment 3 Table 3- 13: Infiltration Basin (1.02 in/hr) BMP Performance Table Infiltration Basin (1.02 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 24.5% 42.0% 65.6% 79.4% 86.8% 91.3% 96.2% 98.1% Cumulative Phosphorus Load 41 % 60% 81 % 90% 94% 97% 99% 100% Reduction ure 3- 10: BMP Performance Curve: Infiltration Basin (Soil infiltration rate = 1.02 in/hr' �a 0 E m c 0 a BMP Performance Curve: Infiltration Basin (Soil infiltration rate = 1.02 in/hr) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 100% 90% 80% c 70% o 60% 50% 40% 0 30% c c 20% 10% 0% ' 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) --*--Total Phosphorus 9 -Volume Page 43 of 67 Appendix F Attachment 3 Table 3- 14: Infiltration Basin (2.41 in/hr) BMP Performance Table Infiltration Basin (2.41 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 32.8% 53.8% 77.8% 88.4% 93.4% 96.0% 98.8% 99.8% Cumulative Phosphorus Load 46% 67% 87% 94% 97% 98% 100% 100% Reduction Figure 3- 11: BMP Performance Curve: Infiltration Basin (infiltration rate = 2.41 in/hr) BMP Performance Curve: Infiltration Basin (infiltration rate = 2.41 in/hr) 100% 100% 90% 90% 80% 80% 70% 70% v > E 60% 60% m � � 50% 50% / 40% 40% o 1 ' 300% 30% ao o 20% 20% 10% 10% 0% 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) -Total Phosphorus 9 -Volume Page 44 of 67 Appendix F Attachment 3 Table 3- 15: Infiltration Basin (8.27 in/hr) BMP Performance Table Infiltration Basin (8.27 in/hr) BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 (inches) Runoff Volume Reduction 54.6% 77.2% 93.4% 97.5% 99.0% 99.6% 100.0% 100.0% Cumulative Phosphorus Load o 59 /0 0 81 /0 0 96 /0 0 99 /0 0 100 /0 0 100 /0 0 100 /0 0 100 /o Reduction �a 0 E a� c c� 0 a we 3- 12: BMP Performance Curve: Infiltration Basin (infiltration rate = 8.27 in/hr BMP Performance Curve: Infiltration Basin (infiltration rate = 8.27 in/hr) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 100% 90% 80% c 70% v 60% 50% E 40% c 30% o _ 20% 10% 0% 1 1 1 1 i I I I i I I I I i ' 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity: Depth of Runoff from Impervious Area (inches) Total Phosphorus 4 -Volume Page 45 of 67 Appendix F Attachment 3 Table 3- 16: Biofiltration BMP Performance Table Biofiltration BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from Impervious Area (inches) 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 Cumulative Phosphorus Load Reduction 19% 34% 53% 64% 71 % 76% 84% 89% 3- 13: BMP Performance Curve: Biofiltration BMP Performance Curve: Biofiltration 100% 0 90% 80% a� 70% c� 0 60% L 50% O N 40% O a 30% m >_ 20% 10% U 0% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 Physical Storage Capacity, Depth of Runoff from Impervious Area (inches) Total Phosphorus 2.0 Page 46 of 67 Appendix F Attachment 3 Table 3- 17: Gravel Wetland BMP Performance Table Gravel Wetland BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 Impervious Area (inches) Cumulative Phosphorus Load Reduction 19% 26% 41 % 51 % 57% 61 % 65% 66% 100% 0 90% 80% m 70% M M 0 60% i 50% O M 40% N O a 30% 20% cv 10% U 0% ,III', 3- 14: BMP Performance Curve: Gravel Wetland BMP Performance Curve: Gravel Wetland 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity, Depth of Runoff from Impervious Area (inches) *—Total Phosphorus Page 47 of 67 Appendix F Attachment 3 Table 3- 18: Porous Pavement BMP Performance Table Porous Pavement BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Filter Course Area (inches) 12.0 18.0 24.0 32.0 Cumulative Phosphorus Load Reduction 62% 70% 75% 78% Figure 3- 15: BMP Performance Curve: Porous Pavement BMP Performance Curve: Porous Pavement 100% c O 90% 80% 70% ca O J 60% 50% 0 t 40% O a 30% 20% c� 10% E U 0% 12 14 16 18 20 22 24 26 28 30 32 Depth of Filter Course Area (inches) Total Phosphorus Page 48 of 67 Appendix F Attachment 3 Table 3- 19: Wet Pond BMP Performance Table Wet Pond BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 Impervious Area (inches) Cumulative Phosphorus Load Reduction 14% 25% 37% 44% 48% 53% 58% 63% Table 3- 20: Dry Pond BMP Performance Table Dry Pond BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 Impervious Area (inches) Cumulative Phosphorus Load Reduction 3% 6% 8% 9% 11 % 12% 13% 14% 100% r_ 90% v 80% 70% 60% c� J 50% 40% L t 30% 20% O d 10% > 0% E V 3- 16: BMP Performance Curve: Dry Pond BMP Performance Curve: Dry Pond 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity, Depth of Runoff from Impervious Area inches Total Phosphorus Page 49 of 67 Appendix F Attachment 3 Table 3- 21: Grass Swale BMP Performance Table Grass Swale BMP Performance Table: Long -Term Phosphorus Load Reduction BMP Capacity: Depth of Runoff Treated from 0.1 0.2 0.4 0.6 0.8 1.0 1.5 2.0 Impervious Area (inches) Cumulative Phosphorus Load Reduction 2% 5% 9% 13% 17% 21 % 29% 36% 100% 0 90% u 80% 70% 60% 0 N 50% 0 40% t N 30% 0 a 20% 10% 0% E 0 U 3- 17: BMP Performance Curve: Grass Swale BMP Performance Curve: Grass Swale 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Physical Storage Capacity, Depth of Runoff from Impervious Area inches -Total Phosphorus Page 50 of 67 Appendix F Attachment 3 Table 3- 22: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 Impervious Area Disconnection through Storage : Impervious Area to Pervious Area Ratio = 8:1 Storage Total Runoff Volume (TP) Reduction Percentages volume to impervious area ratio HSG A HSG B HSG C HSG D 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day Olin 24% 23% 22% 24% 23% 22% 24% 23% 22% 22% 22% 21% 0.2in 40% 38% 37% 40% 38% 37% 37% 38% 37% 24% 26% 27% 0.3in 52% 50% 49% 52% 50% 49% 40% 46% 49% 24% 26% 27% 0.4in 61% 59% 58% 59% 59% 58% 40% 48% 54% 24% 26% 27% 0.5in 67% 66% 64% 62% 66% 64% 40% 48% 56% 24% 26% 27% 0.6in 70% 71% 70% 62% 70% 70% 40% 48% 56% 24% 26% 27% 0.8in 71% 78% 77% 62% 73% 77% 40% 48% 56% 24% 26% 27% 1.0in 71% 80% 80% 62% 73% 79% 40% 48% 56% 24% 26% 27% 1.5in 71% 81% 87% 62% 73% 81% 40% 48% 56% 24% 26% 27% 2.0in 71% 81% 88% 62% 73% 81% 40% 48% 56% 24% 26% 27% Figure 3- 18: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG A Soils Cumulative Runoff Volume (TP) Reduction for HSG A soil and Impervious to Pervious Ratio at 8:1 at Three Release Rates 10Q% 90% 1-day 2-day 84% ------------------ c , o 3-day +� 70°f° c ------ ------ —--------- --------- 6 Q°f° i ii t 50%----------- E O 7 — 3 Q°f • 0 ~ 20%----------- - - 1 0%-----•- ------------- +------------ 0% T 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 51 of 67 Appendix F Attachment 3 Figure 3- 19: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG B Soils Cumulative Runoff Volume (TP) Reduction for HSG B soil and Impervious to Pervious Ratio at 8:1 at Three Release Rates 90% 80% G 70% 60% a 50% H E 40% > 30% M 0 20% 10% 0% 4-- 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Figure 3- 20: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG C Soils i Cumulative Runoff Volume (TP) Reduction for HSG C soil and I Impervious to Pervious Ratio at 8:1 at Three Release Rates 60% c 50% 0 3 40°!0----------- --- ---- --- --------------------'— --------------------- a H 30% ----- - m I t i -day , _ f 2-day 20%----------------------- --- +3-day--------------------;------------;------------ co 0 0 ~ 10% 0% + 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ratio between rain barrel volume to rooftop area (inches) 1.8 2 Page 52 of 67 Appendix F Attachment 3 Figure 3- 21: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 8:1 for HSG D Soils Cumulative Runoff Volume (TP) Reduction for HSG D soil and Impervious to Pervious Ratio at 8:1 at Three Release Rates 30% 25% O v 7 20% 0% + 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ratio between rain barrel volume to rooftop area (inches) 1.8 2 Table 3- 23: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 Rain barrel volume to Total Runoff Volume and Phosphorus Load (TP) Reduction Percentages impervious area ratio HSG A HSG B HSG C HSG D 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 0.1in 24% 23% 22% 24% 23% 22% 24% 23% 22% 23% 23% 22% 0.2in 40% 38% 37% 40% 38% 37% 40% 38% 37% 28% 30% 33% 0.3in 52% 50% 49% 52% 50% 49% 47% 50% 49% 29% 31% 34% 0.4in 61% 59% 58% 61% 59% 58% 48% 55% 58% 29% 31% 34% 0.5in 67% 66% 64% 67% 66% 64% 48% 57% 63% 29% 31% 34% 0.6 in 73% 71% 70% 70% 71% 70% 48% 57% 65% 29% 31% 34% 0.8 in 78% 78% 77% 71% 78% 77% 48% 57% 66% 29% 31% 34% 1.0 in 79% 81 % 80% 71% 79% 80% 48% 57% 66% 29% 31% 34% 1.5in 79% 87% 88% 71% 80% 87% 48% 57% 66% 29% 31% 34% 2.0in 79% 87% 91% 71% 80% 87% 48% 57% 66% 29% 31% 34% Page 53 of 67 Appendix F Attachment 3 Figure 3- 22: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG A Soils Cumulative Runoff Volume (TP) Reduction for HSG A soil and 1 imperviousto Pervious Ratio at 6:1 at Three Release Rates 100% 90% 70% -------- t1-clay 80% -------- t2-day c g ° —w-3-day ----------;-------------------- ;---------- ;------------;-- U 7 I a 50%----------- --------------------------------------------------------------------------- - F ' 40% E 30°--------- 0 /° ------ n 20% 0 ~ 10% ------ :- 0% 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ratio between rain barrel volume to rooftop area (inches) 1.8 2 Figure 3- 23: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG B Soils Cumulative Runoff Volume (TP) Reduction for HSG B soil and Impervious to Pervious Ratio at 6:1 at Three Release Rates 100% 90%---.... t1-day ------ 0 80%-------- f 2-day 2 70% 3-day -13 60%-----------.--- a H 50% 0 E 40% 0 a 30% c� H 20% 10%-------:----=---------- -- 0% ��- 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ratio between rain barrel volume to rooftop area (inches) 1.8 2 Page 54 of 67 Appendix F Attachment 3 Figure 3- 24: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG C Soils Cumulative Runoff Volume (TP) Reduction for HSG C soil and Impervious to Pervious Ratio at 6:1 at Three Release Rates 76% 6D% 0 50% ------ ------------------------------------'----------- ------ m L ,-. 40% - CL ti-day F 30% - —A-2-day--------- —' 3-day 0 20% 0 ~ 10% -- --- --- -- - ------ ---------- -'_... 0% + 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Ratio between rain barrel volume to rooftop area (inches) 1.6 2 Figure 3- 25: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 6:1 for HSG D Soils Cumulative Runoff Volume (TP) Reduction for HSG D soil and Impervious to Pervious Ratio at 6:1 at Three Release Rates 40% 35% 2D/° a ------------I--------- f 2-day ----------------------------------------------------- m 15% .. --*-3-1a 7 - °a 10% � .... I � 0 5% H ---------------- - 0% + 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 55 of 67 Appendix F Attachment 3 Table 3- 24: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 Storage Total Runoff Volume and Phosphorus Load (TP) Reduction Percentages volume to impervious area ratio HSG A HSG B HSG C HSG D 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 0.1 in 24% 23% 22% 24% 23% 22% 24% 23% 22% 24% 23% 22% 0.2in 40% 38% 37% 40% 38% 37% 40% 38% 37% 37% 37% 37% 0.3in 52% 50% 49% 52% 50% 49% 52% 50% 49% 39% 42% 45% 0.4 in 61% 59% 58% 61% 59% 58% 58% 59% 58% 39% 42% 47% 0.5in 67% 66% 64% 67% 66% 64% 60% 65% 64% 40% 42% 47% 0.6 in 73% 71 % 70% 73% 71 % 70% 61% 68% 70% 40% 42% 47% 0.8in 79% 78% 77% 79% 78% 77% 61% 69% 75% 40% 42% 47% 1.0 in 82% 81 % 80% 80% 81 % 80% 61% 69% 76% 40% 42% 47% 1.5in 87% 89% 88% 80% 87% 88% 61% 69% 76% 40% 42% 47% 2.0 in 87% 91 % 91 % 80% 88% 91 % 61% 69% 76% 40% 42% 47% Figure 3- 26: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG A Soils Cumulative Runoff Volume (TP) Reduction for HSG A soil and Impervious to Pervious Ratio at 4:1 at Three Release Rates 100% 90% Q 80% 70% m 60°io IL F- 5D% W 40% 0 a 30% 0 0 20% t 1-day f2-day - �3-day 1 0%-------- - - .-----------;----------------------------------------------------------------------------------- 0% 0 0.2 0.4 0.6 0.6 1 1.2 1 A 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 56 of 67 Appendix F Attachment 3 Figure 3- 27: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG B Soils Cumulative Runoff Volume (TP) Reduction for HSG B soil and Impervious to Pervious Ratio at 4:1 at Three Release Rates ioa% 90% 0 .2 80% 70% CD 60% ii H 50% a) E 40% 0 a 30% 0 20% 10% 0% t 1-day -I ------.. f2-day ... .------------ 3-day -------------------- i 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Figure 3- 28: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG C Soils Cumulative Runoff Volume (TP) Reduction for HSG C soil and Imperviousto Pervious Ratio at 4:1 at Three Release Rates J 80% 70% 0 6 60% v 50% IL y 40% 30% 0 m 20% 0 H 10% +1-day ................... f2-day ---3-day 0% ; 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 57 of 67 Appendix F Attachment 3 Figure 3- 29: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 4:1 for HSG D Soils Cumulative Runoff Volume (TP) Reduction for HSG D soil and Impervious to Pervious Ratio at 4:1 at Three Release Rates 50% 45%---------- --------------- ------ _----�---` 0 4D°!° U I —o—1-da a �2-day H 25% ---------------- °' 3-day E20°!°------------------------------ O > 15% *- 01 0%------------------------------------------;----- - - - - - ----- -- 5% 0% 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Ratio between rain barrel volume to rooftop area (inches) itl Table 3- 25: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 2:1 Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 2:1 Storage Total Runoff Volume and Phosphorus Load (TP) Reduction Percentages volume to impervious area ratio HSG A HSG B HSG C HSG D 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 0.1in 24% 23% 22% 24% 23% 22% 24% 23% 22% 24% 23% 22% 0.2in 40% 38% 37% 40% 38% 37% 40% 38% 37% 40% 38% 37% 0.3 in 52% 50% 49% 52% 50% 49% 52% 50% 49% 51% 50% 49% 0.4in 61% 59% 58% 61% 59% 58% 61% 59% 58% 57% 58% 57% 0.5in 67% 66% 64% 67% 66% 64% 67% 66% 64% 59% 62% 63% 0.6in 73% 71% 70% 73% 71% 70% 72% 71% 70% 59% 62% 67% 0.8in 79% 78% 77% 79% 78% 77% 77% 78% 77% 59% 62% 67% 1.0 in 82% 81 % 80% 82% 81 % 80% 78% 81 % 80% 59% 62% 67% 1.5in 89% 89% 88% 89% 89% 88% 78% 84% 88% 59% 62% 67% 2.0 in 92% 92% 91 % 91 % 92% 91 % 78% 84% 89% 59% 62% 67% Page 58 of 67 Appendix F Attachment 3 Figure 3- 30: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG A Soils Cumulative Runoff Volume (TP) Reduction for HSG A soil and Impervious to Pervious Ratio at 2:1 at Three Release Rates 0.2 0.4 0.6 0.0 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Figure 3- 31: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG B Soils Cumulative Runoff Volume (TP) Reduction for HSG B soil and Impervious to Pervious Ratio at 2:1 at Three Release Rates 100% 90°i° --a-1-day c 80% t2 clay .... ------------- 0 70°J° 3-day Y c m a H 50% m p 30° 0 0% - 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 59 of 67 Appendix F Attachment 3 Figure 3- 32: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio= 2:1 for HSG C Soils Cumulative Runoff Volume (TP) Reduction for HSG C soil and Impervious to Pervious Ratio at 2:1 at Three Release Rates 100% 90% ------ 1-day ... 0 80°/° - - t 2-day --- 70% 3-day -- - - a t 50° -- 10 m _--------- 0 a30%--------------------J----------------------- ---- H 20% - 10% - - 0% -� 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Figure 3- 33: Impervious Area Disconnection through Storage: Impervious Area to Pervi Area Ratio= 2:1 for HSG D Soils Cumulative Runoff Volume (TP) Reduction for HSG D soil and Impervious to Pervious Ratio at 2:1 at Three Release Rates 70% 60% a u 50% ID m 40% 10% 0% 0 ------------ ;------- .. ..... . - - 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) ous Page 60 of 67 Appendix F Attachment 3 Table 3- 26: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 Storage Total Runoff Volume and Phosphorus Load (TP) Reduction Percentages Volume to impervious area ratio HSG A HSG B HSG C HSG D 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 1-day 2-day 3-day 0.1in 24% 23% 22% 24% 23% 22% 24% 23% 22% 24% 23% 22% 0.2 in 40% 38% 37% 40% 38% 37% 40% 38% 37% 40% 38% 37% 0.3 in 52% 50% 49% 52% 50% 49% 52% 50% 49% 52% 50% 49% 0.4 in 61 % 59% 58% 61 % 59% 58% 61 % 59% 58% 61 % 59% 58% 0.5 in 67% 66% 64% 67% 66% 64% 67% 66% 64% 67% 66% 64% 0.6 in 73% 71 % 70% 73% 71 % 70% 73% 71 % 70% 72% 71 % 70% 0.8in 79% 78% 77% 79% 78% 77% 79% 78% 77% 78% 78% 77% 1.0 in 82% 81 % 80% 82% 81 % 80% 82% 81 % 80% 79% 80% 80% 1.5in 89% 89% 88% 89% 89% 88% 89% 89% 88% 80% 82% 86% 2.0 in 92% 92% 91 % 92% 92% 91 % 91 % 92% 91 % 80% 82% 86% Figure 3- 34: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG A Soils Cumulative Runoff Volume (TP) Reduction for HSG A soil and Impervious to Pervious Ratio at 1.1 at Three Release Rates 100% 90% y 2-day ------ ---------- • I 0 u -- 3-day -- • ` 6 0" I H 50°/v------------------ o 30% - ------ - ---------- M 0 20% ---- ------------------ , i 10%---------- --- 0% 7 rt 0 0.2 4.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 61 of 67 Appendix F Attachment 3 Figure 3- 35: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG B Soils Cumulative Runoff Volume (TP) Reduction for HSG B soil and Impervious to Pervious Ratio at 1:1 at Three Release Rates 100% 90% c 80% 0 = 70% 60% a H 50% m E 40% 0 30% 0 20% 10% 0% L a 1-day f2-day —*-- 3-day 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Figure 3- 36: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG C Soils Cumulative Runoff Volume Reduction for HSG C soil and Impervious to Pervious Ratio at 1:1 at Three Release Rates 100% —*---1-day--------- 80% —�t: 2-day -------------------------------------- ------ 0 _ —&— 3-da ,. y U i i a E— 50% a� I E 40% 0 30%-------- -I----------- ---------- 'r----------'-----------' 0 20%------------r----------------------,---------- ----- ------ 10%----------- - -- - i- ---------i---------- 0% 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Ratio between rain barrel volume to rooftop area (inches) Page 62 of 67 Appendix F Attachment 3 Figure 3- 37: Impervious Area Disconnection through Storage: Impervious Area to Pervious Area Ratio = 1:1 for HSG D Soils 7 Cumulative Runoff Volume Reduction for HSG D soil and Impervious to Pervious Ratio at 1:1 at Three Release Rates I 90% 80% E 50% a t E 40% 2 i 30% H 20% 10% 0% --O--1 -day -------------------------------- t2-day —&-3-day --------------- ------------ 0 0.2 0.4 0.6 0.8 1 11 1.4 1.6 1-8 2 Ratio between rain barrel volume to rooftop area (inches) Table 3- 27: Impervious Area Disconnection Performance Table Impervious area to pervious area ratio Soil type of Receiving Pervious Area HSG A HSG B HSG C HSG D 8:1 30% 14% 7% 3% 6:1 37% 18% 11 % 5% 4:1 48% 27% 17% 9% 2:1 64% 45% 33% 21 % 1:1 74% 59% 49% 36% 1:2 82% 67% 60% 49% 1:4 85% 72% 67% 57% Page 63 of 67 Appendix F Attachment 3 3- 38: lmvervious Area Disconnection Yertormance Curves Accumlative Total Phosphorus Removal from Imperviousness Disconnection at Varying Impervious to Pervious Area Ratios 90% 80% --- �~--i-----------i------------i------------r------- -,------------ To70% ----------- ---------------------,------------ ---- ---- 0 E60%------------- a 1----------- I --------- --'----------- -------- ----------- y o , e40% -----------+- ------- a - - - - - - --- - ----- - - -------a------------ 0 s 0 > i + i i E 3u T 0% u Q 8:1 6:1 4:1 2:1 1:1 1:2 1:4 Impervious area to Pervious Area Ratios Table 3- 28: Performance Table for Conversion of Impervious Areas to Pervious Area based on Hvdroloaical Soil Grouvs Cumulative Reduction in Annual Stormwater Phosphorus Load Conversion Conversion Conversion ConversionConversion of Land -Use Group of of of impervious of impervious impervious impervious area to impervious area to area to area to area to pervious pervious pervious pervious area-HDSG pervious area-HSG A area-HSG B area-HSG C area-HSG D Commercial (Com) and 98.5% 93.5% 88.0% 83.5 ° 79.5 ° /°/° Industrial (Ind) Multi -Family (MFR) and High -Density Residential 98.8% 95.0% 90.8% 87.3% 84.2% (HDR) Medium -Density 98.6% 94.1 % 89.1 % 85.0% 81.4% Residential (MDR) Low Density Residential 98.2% 92.4% 85.9% 80.6% 75.9% (LDR) - "Rural" Highway (HWY) 98.0% 91.3% 84.0% 78.0% 72.7% Forest (For) 98.2% 92.4% 85.9% 80.6% 75.9% Open Land (Open) 98.2% 92.4% 85.9% 80.6% 75.9% Agriculture (Ag) 70.6% 70.6% 70.6% 70.6% 70.6% Page 64 of 67 Appendix F Attachment 3 Table 3- 29: Performance Table for Conversion of Low Permeable Pervious Area to High Permeable Pervious Area based on Hydrological Soil Group Cumulative Reduction in Annual SW Phosphorus Load from Pervious Area Conversion of Conversion of Conversion of Conversion of Conversion of Land Cover pervious area pervious area pervious area pervious area pervious area HSG D to HSG D to HSG D to HSG C to HSG C to pervious area- pervious area- pervious area- pervious area- pervious area- HSG A HSG B HSG C HSG A HSG B Developed Pervious 92.7% 68.3% 41.5% 83.5 ° 79.5 ° /°/0 Land Page 65 of 67 Appendix F Attachment 3 Table 3-30 Method for determining stormwater control design volume (DSV) (i.e., capacity) using Long-term cumulative performance curves Applicable Structural Equation for calculating Design Storage Stormwater Control Description Stormwater Control Capacity for Estimating Cumulative Type Performance Curve Reductions using Performances Curves Infiltration Trench Provides temporary storage of runoff using the void spaces within the soil/sand/gravel Infiltration Trench (6 infiltration DSV = void space volumes of gravel and sand layers mixture that is used to backfill the trench for subsequent infiltration into the rates: 0.17, 0.27, 0.52, 1.02, 2.41 and DSV = (L x W x Dstone x nsmne )+ (L x W x D—d x n—d) surrounding sub -soils. 8.27 inches per hour) Subsurface Infiltration Provides temporary storage of runoff using the combination of storage structures (e.g., Infiltration Trench (6 infiltration DSV = Water storage volume of storage units and void galleys, chambers, pipes, etc.) and void spaces within the soil/sand/gravel mixture that rates: 0.17, 0.27, 0.52, 1.02, 2.41 and space volumes of backfill materials. Example for is used to backfill the system for subsequent infiltration into the surrounding sub -soils. 8.27 inches per hour) subsurface galleys backfilled with washed stone: DSV = (L x W x D) n is + (L x W x Donne x netene) Surface Infiltration Provides temporary storage of runoff through surface pending storage structures (e.g., Infiltration Basin (6 infiltration DSV = Water volume of storage structure before bypass. basin or swale) for subsequent infiltration into the underlying soils. rates: 0.17, 0.27, 0.52, 1.02, 2.41 and Example for linear trapezoidal vegetated swale 8.27 inches per hour) DSV = (L x ((Wbottem+Wte Durex /2) x D Rain Garden/Bio- Provides temporary storage of runoff through surface pending and possibly void spaces Infiltration Basin (6 infiltration DSV = Ponding water storage volume and void space retention (no within the soil/sand/gravel mixture that is used to filter runoff prior to infiltration into rates: 0.17, 0.27, 0.52, 1.02, 2.41 and volumes of soil filter media. Example for raingarden underdrains) underlying soils. 8.27 inches per hour) DSV = (Arend x Dpond) + (Aaoil x Mind x neod mix) Tree Filter (no Provides temporary storage of runoff through surface pending and void spaces within Infiltration Trench (6 infiltration DSV = Pending water storage volume and void space underdrain) the soil/sand/gravel mixture that is used to filter runoff prior to infiltration into rates: 0.17, 0.27, 0.52, 1.02, 2.41 and volumes of soil filter media. underlying soils. 8.27 inches per hour) DSV = (L x W x Dponding) + (L x W x Deoii x nsoil mix) Bio-Filtration Provides temporary storage of runoff for filtering through an engineered soil media. The Bio-filtration DSV = Ponding water storage volume and void space (w/underdrain) storage capacity includes void spaces in the filter media and temporary pending at the volume of soil filter media. Example of a linear biofilter: surface. After runoff has passed through the filter media it is collected by an under- DSV = (L x W x Dpend;ng)+ (L x W x Deed x m ii) drain pipe for discharge. Manufactured or packaged bio-filter systems such as tree box filters may be suitable for using the bio-filtration performance results. Gravel Wetland Based on design by the UNH Stormwater Center (UNHSC). Provides temporary Gravel Wetland DSV = pretreatment volume + pending volume + void surface pending storage of runoff in a vegetated wetland cell that is eventually routed to space volume of gavel ISR. an underlying saturated gravel internal storage reservoir (ISR) for nitrogen treatment. DSV = (A r,emunnent x DpmTrexbnent)+ (A wedxnd x Dpending)+ Outflow is controlled by an elevated orifice that has its invert elevation equal to the top (AisR x Dgravel x ngre el) of the ISR layer and provides a retention time of at least 24 hours. Porous Pavement with Provides filtering of runoff through a filter course and temporary storage of runoff Infiltration Trench (6 infiltration DSV = void space volumes of gravel layer subsurface infiltration within the void spaces of a subsurface gavel reservoir prior to infiltration into subsoils. rates: 0.17, 0.27, 0.52, 1.02, 2.41 and DSV = (L x W x Dstone x nstene ) 8.27 inches per hour) Porous pavement w/ Provides filtering of runoff through a filter course and temporary storage of runoff Porous Pavement Depth of Filter Course = D Fc impermeable underliner within the void spaces prior to discharge by way of an underdrain. w/underdrain Wet Pond Provides treatment of runoff through routing through permanent pool. Wet Pond DSV= Permanent pool volume prior to high flow bypass DSV=A and x D and (doe—tinclude retreatment-lum ) Extended Dry Detention Provides temporary detention storage for the design storage volume to drain in 24 hours Dry Pond DSV= Pending volume prior to high flow bypass Basin through multiple out let controls. DSV=Rend x Druid (does not include pretreatnxnt w4 ) Dry Water Quality Based on MA design standards. Provides temporary surface pending storage of runoff Grass swale DSV = Volume of Swale at full design depth Swale/Grass Swale in an open vegetated channel through permeable check dams. Treatment is provided by DSV=Lswale x Aswale filtering of runoff by vegetation and check dams and infiltration into subsurface soils. Definitions: DSV= Design Storage Volume = physical storage capacity to hold water; VSV = Void Space Volume; L = length, W = width, D = depth at design capacity before bypass, n = porosity fill material, A= average surface area for calculating volume; Infiltration rate = saturated soil hydraulic conductivity Page 66 of 67 MA MS4 General Permit Appendix G Appendix G Massachusetts Small MS4 Permit Monitoring Requirements For Discharges into Impaired Waters - Parameters and Methods Pollutant Causing Impairment Monitoring Parameter EPA or Approved Method No. Aluminum Aluminum, Total 200.7; 200.8; 200.9 Ammonia (Un-ionized) Ammonia - Nitrogen 3 S 0.1 Arsenic Arsenic, Total 200.7; 200.8; 200.9 Cadmium Cadmium, Total 200.7; 200.8; 200.9 Chlordane NMR 608; 625 Chloride Chloride 300 Chromium (total) Chromium, Total 200.7; 200.8; 200.9 Copper Copper, Total 200.7; 200.8; 200.9 DDT NMR 608; 62S DEHP (Di-sec-octyl phthalate) NMR --- Dioxin (including 2,3,7,8-TCDD) NMR 613; 1613 Dioxin (2,3,7,8-Tetrachlorodibenzo-p-dioxin only) NMR 613 Lead Lead, Total 200.7; 200.8; 200.9 Mercury in Water Column NMR unless potentially present such (e.g., salvage yards crushing vehicles with Hg switches) 200.7; 200.8; 200.9 Nitrogen (Total) Nitrogen, Total 351.1/351.2 + 353.2 Pentachlorophenol (PCP) NMR --- Petroleum Hydrocarbons Oil and Grease 1664 Phosphorus (Total) Phosphorus, Total 365.1; 365.2; 365.3; SM 4500-P-E Polychlorinated biphenyls NMR --- Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems) PAHs 610; 1625 Sulfide -Hydrogen Sulfide NMR --- Mercury in Fish Tissue NMR --- PCB in Fish Tissue NMR --- Total Dissolved Solids Total Dissolved Solids 160.1 Total Suspended Solids (TSS) Total Suspended Solids 160.2, 180.1 Turbidity Total Suspended Solids and Turbidity 160.2, 180.1 Secchi disk transparency Total Suspended Solids 160.2 Sediment Screening Value (Exceedence) Total Suspended Solids 160.2 Pagel of 3 MA MS4 General Permit Appendix G Sedimentation/Siltation Total Suspended Solids 160.2 Bottom Deposits Total Suspended Solids 160.2 Color NMR pH, High pH 150.2 pH, Low pH 150.2 Taste and Odor NMR --- Temperature, water NMR --- Salinity Specific Conductance 120.1 1106.1; 1600; Enterococcus Enterococcus Enterolert° 12 22. 1103.1; 1603; Colilert° 12 16, Colilert-181 12 Escherichia coli E. coli 15 16.; mColiBlue- 24017. Fecal Coliform Fecal Coliform 1680; 1681 Enterococcus (marine 1106.1; 1600 Organic Enrichment (Sewage) Biological Indicators waters) or E. coli (freshwater) Debris/Floatables/Trash NMR or Foam/Flocs/Scum/Oil Slicks Contact MassDEP 1103.1; 1603 Oil and Grease Oil and Grease --- Total Phosphorus --- (freshwater) Chlorophyll-a Total Nitrogen (marine 1664 waters) Total Phosphorus 365.1; 365.2; 365.3 (freshwater) Nutrient/Eutrophication Biological Indicators Total Nitrogen (marine 351.1/351.2 + 353.2 waters) Dissolved Oxygen 365.1; 365.2; 365.3 Temperature 351.1/351.2 + 353.2 BODS 360.1; 360.2 Dissolved oxygen saturation / Oxygen, Dissolved Total Phosphorus SM-2550 (freshwater) Total Nitrogen (marine SM-5210 waters) Total Phosphorus 365.1; 365.2; 365.3 (freshwater) Excess Algal Growth Total Nitrogen (marine 351.1/351.2 + 353.2 waters) Aquatic Plants (Macrophytes) NMR -- Page 2 of 3 MA MS4 General Permit Appendix G Abnormal Fish deformities, erosions, lesions, tumors (DELTS) NMR --- Abnormal Fish Histology (Lesions) NMR --- Estuarine Bioassessments Contact MassDEP --- Fishes Bioassessments Contact MassDEP --- Aquatic Macroinvertebrate Bioassessments Contact MassDEP --- Combined Biota/Habitat Bioassessments Contact MassDEP --- Habitat Assessment (Streams) Contact MassDEP --- Lack of a coldwater assemblage Contact MassDEP --- Fish Kills Contact MassDEP --- Whole Effluent Toxicity (WET) Contact MassDEP --- Ambient Bioassays -- Chronic Aquatic Toxicity Contact MassDEP --- Sediment Bioassays -- Acute Toxicity Freshwater Contact MassDEP --- Sediment Bioassays -- Chronic Toxicity Freshwater Contact MassDEP --- Fish-Passage Barrier NMR --- Alteration in stream -side or littoral vegetative covers NMR --- Low flow alterations NMR --- Other flow regime alterations NMR --- Physical substrate habitat alterations NMR --- Other anthropogenic substrate alterations NMR --- Non-Native Aquatic Plants NMR --- Eurasian Water Milfoil, Myriophyllum spicatum NMR --- Zebra mussel, Dreissena polymorph NMR --- Other Contact MassDEP --- Notes: NMR" indicates no monitoring required "Total Phosphorus (freshwater)" indicates monitoring required for total phosphorus where stormwater discharges to a water body that is freshwater "Total Nitrogen (marine water)" indicates monitoring required for total nitrogen where stormwater discharges to a water body that is a marine or estuarine water Page 3 of 3 MA MS4 General Permit Appendix H [APPENDIX H Requirements Related to Discharges to Certain Water Quality Limited Waterbodies Table of Contents Discharges to water quality limited waterbodies and their tributaries where nitrogen is thecause of the impairment.............................................................................................. I II. Discharges to water quality limited waterbodies and their tributaries where phosphorus is the cause of the impairment..........................................................................................5 III. Discharges to water quality limited waterbodies where bacteria or pathogens is the causeof the impairment....................................................................................................8 IV. Discharges to water quality limited waterbodies where chloride is the cause of the impairment......................................................................................................................10 V. Discharges to water quality limited waterbodies and their tributaries where solids, oil and grease (hydrocarbons), or metals is the cause of the impairment ............................13 Attachment 1- Nitrogen Reduction Credits For Selected Structural BMPs I. Discharges to water quality limited waterbodies and their tributaries where nitrogen is the cause of the impairment 1. Part 2.2.2.a.i. of the permit identifies the permittees subject to additional requirements to address nitrogen in their stormwater discharges because they discharge to waterbodies that are water quality limited due to nitrogen, or their tributaries, without an EPA approved TMDL. Permittees identified in part 2.2.2.a.i of the permit must identify and implement BMPs designed to reduce nitrogen discharges in the impaired catchment(s). To address nitrogen discharges each permittee shall comply with the following requirements: a. Additional or Enhanced BMPs The permittee remains subject to all the requirements of part 2.3. of the permit and shall include the following enhancements to the BMPs required by part 2.3 of the permit: Part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (April/May) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow -release fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the Fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual Page 1 of 14 MA MS4 General Permit Appendix H message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of nitrogen to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part II and III as well as Appendix F part A.III, A.IV, A.V, B.I, B.II and B.III where appropriate. 2. Part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for nitrogen removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs to reduce nitrogen discharges. Part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: establish requirements for use of slow release fertilizers on permittee owned property currently using fertilizer, in addition to reducing and managing fertilizer use as provided in 2.3.7.1; establish procedures to properly manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increase street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a minimum of two times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1 — Dec 1; following leaf fall). b. Nitrogen Source Identification Report Within four years of the permit effective date the permittee shall complete a Nitrogen Source Identification Report. The report shall include the following elements: 1. Calculation of total MS4 area draining to the water quality limited water segments or their tributaries, incorporating updated mapping of the MS4 and catchment delineations produced pursuant to part 2.3.4.6, 2. All screening and monitoring results pursuant to part 2.3.4.7.d., targeting the receiving water segment(s) 3. Impervious area and DCIA for the target catchment 4. Identification, delineation and prioritization of potential catchments with high nitrogen loading 5. Identification of potential retrofit opportunities or opportunities for the installation of structural BMPs during redevelopment ii. The final Nitrogen Source Identification Report shall be submitted to EPA as part of the year 4 annual report. c. Potential Structural BMPs Page 2 of 14 MA MS4 General Permit Appendix H Within five years of the permit effective date, the permittee shall evaluate all permittee-owned properties identified as presenting retrofit opportunities or areas for structural BMP installation under permit part 2.3.6.d.ii. or identified in the Nitrogen Source Identification Report that are within the drainage area of the impaired water or its tributaries. The evaluation shall include: 1. The next planned infrastructure, resurfacing or redevelopment activity planned for the property (if applicable) OR planned retrofit date; 2. The estimated cost of redevelopment or retrofit BMPs; and 3. The engineering and regulatory feasibility of redevelopment or retrofit BMPs. ii. The permittee shall provide a listing of planned structural BMPs and a plan and schedule for implementation in the year 5 annual report. The permittee shall plan and install a minimum of one structural BMP as a demonstration project within the drainage area of the water quality limited water or its tributaries within six years of the permit effective date. The demonstration project shall be installed targeting a catchment with high nitrogen load potential. The permittee shall install the remainder of the structural BMPs in accordance with the plan and schedule provided in the year 5 annual report. iii. Any structural BMPs listed in Table 3 of Attachment 1 to Appendix H already existing or installed in the regulated area by the permittee or its agents shall be tracked and the permittee shall estimate the nitrogen removal by the BMP consistent with Attachment 1 to Appendix H. The permittee shall document the BMP type, total area treated by the BMP, the design storage volume of the BMP and the estimated nitrogen removed in mass per year by the BMP in each annual report. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix H part I.1. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The receiving water and all downstream segments are determined to no longer be impaired due to nitrogen by MassDEP and EPA concurs with such determination. ii. An EPA approved TMDL for the receiving water or downstream receiving water indicates that no additional stormwater controls for the control of nitrogen are necessary for the permittee's discharge based on wasteload allocations as part of the approved TMDL. b. In such a case, the permittee shall document the date of the determination provided for in paragraph a. above or the approved TMDL date in its SWMP and is relieved of any additional requirements of Appendix H part I.1. as of the applicable date and the permittee shall comply with the following: Page 3 of 14 MA MS4 General Permit Appendix H i. The permittee shall identify in its SWMP all activities that have been implemented in accordance with the requirements of Appendix H part I.1. as of the applicable date to reduce nitrogen in its discharges, including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix H part 1.1. required to be done prior to the date of determination or the date of the approved TMDL, including ongoing implementation of identified non- structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 4 of 14 MA MS4 General Permit Appendix H II. Discharges to water quality limited waterbodies and their tributaries where phosphorus is the cause of the impairment Part 2.2.2.b.i. of the permit identifies the permittees subject to additional requirements to address phosphorus in their stormwater discharges because they discharge to waterbodies that are water quality limited due to phosphorus, or their tributaries, without an EPA approved TMDL. Permittees identified in part 2.2.2.b.i. of the permit must identify and implement BMPs designed to reduce phosphorus discharges in the impaired catchment(s). To address phosphorus discharges each permittee shall comply with the following requirements: a. Additional or Enhanced BMPs The permittee remains subject to the requirements of part 2.3. of the permit and shall include the following enhancements to the BMPs required by part 2.3 of the permit: Part 2.3.2, Public education and outreach: The permittee shall supplement its Residential and Business/Commercial/Institution program with annual timed messages on specific topics. The permittee shall distribute an annual message in the spring (March/April) timeframe that encourages the proper use and disposal of grass clippings and encourages the proper use of slow -release and phosphorous -free fertilizers. The permittee shall distribute an annual message in the summer (June/July) timeframe encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee shall distribute an annual message in the fall (August/September/October) timeframe encouraging the proper disposal of leaf litter. The permittee shall deliver an annual message on each of these topics, unless the permittee determines that one or more of these issues is not a significant contributor of phosphorous to discharges from the MS4 and the permittee retains documentation of this finding in the SWMP. All public education messages can be combined with requirements of Appendix H part I and III as well as Appendix F part A.III, A.IV, A.V, B.I, B.II and B.III where appropriate. 2. Part 2.3.6, Stormwater Management in New Development and Redevelopment: the requirement for adoption/amendment of the permittee's ordinance or other regulatory mechanism shall include a requirement that new development and redevelopment stormwater management BMPs be optimized for phosphorus removal; retrofit inventory and priority ranking under 2.3.6. Lb shall include consideration of BMPs that infiltrate stormwater where feasible. Part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: Establish procedures to properly manage grass cuttings and leaf litter on permittee property, including prohibiting blowing organic waste materials onto adjacent impervious surfaces; increased street sweeping frequency of all municipal owned streets and parking lots subject to Permit part 2.3.7.a.iii.(c) to a Page 5 of 14 MA MS4 General Permit Appendix H minimum of two times per year, once in the spring (following winter activities such as sanding) and at least once in the fall (Sept 1— Dec 1; following leaf fall). b. Phosphorus Source Identification Report Within four years of the permit effective date the permittee shall complete a Phosphorus Source Identification Report. The report shall include the following elements: 1. Calculation of total MS4 area draining to the water quality limited receiving water segments or their tributaries, incorporating updated mapping of the MS4 and catchment delineations produced pursuant to part 2.3.4.6, 2. All screening and monitoring results pursuant to part 2.3.4.7.d., targeting the receiving water segment(s) 3. Impervious area and DCIA for the target catchment 4. Identification, delineation and prioritization of potential catchments with high phosphorus loading 5. Identification of potential retrofit opportunities or opportunities for the installation of structural BMPs during redevelopment, including the removal of impervious area ii. The phosphorus source identification report shall be submitted to EPA as part of the year 4 annual report. c. Potential Structural BMPs Within five years of the permit effective date, the permittee shall evaluate all permittee-owned properties identified as presenting retrofit opportunities or areas for structural BMP installation under permit part 2.3.6.d.ii or identified in the Phosphorus Source Identification Report that are within the drainage area of the water quality limited water or its tributaries. The evaluation shall include: 1. The next planned infrastructure, resurfacing or redevelopment activity planned for the property (if applicable) OR planned retrofit date; 2. The estimated cost of redevelopment or retrofit BMPs; and 3. The engineering and regulatory feasibility of redevelopment or retrofit BMPs. ii. The permittee shall provide a listing of planned structural BMPs and a plan and schedule for implementation in the year 5 annual report. The permittee shall plan and install a minimum of one structural BMP as a demonstration project within the drainage area of the water quality limited water or its tributaries within six years of the permit effective date. The demonstration project shall be installed targeting a catchment with high phosphorus load potential. The permittee shall install the Page 6 of 14 MA MS4 General Permit Appendix H remainder of the structural BMPs in accordance with the plan and schedule provided in the year 5 annual report. iii. Any structural BMPs installed in the regulated area by the permittee or its agents shall be tracked and the permittee shall estimate the phosphorus removal by the BMP consistent with Attachment 3 to Appendix F. The permittee shall document the BMP type, total area treated by the BMP, the design storage volume of the BMP and the estimated phosphorus removed in mass per year by the BMP in each annual report. 2. At any time during the permit term the permittee may be relieved of additional requirements in Appendix H part II.1. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The receiving water and all downstream segments are determined to no longer be impaired due to phosphorus by MassDEP and EPA concurs with such determination. ii. An EPA approved TMDL for the receiving water or downstream receiving water indicates that no additional stormwater controls for the control of phosphorus are necessary for the permittee's discharge based on wasteload allocations as part of the approved TMDL. b. In such a case, the permittee shall document the date of the determination provided for in paragraph a. above or the approved TMDL date in its SWMP and is relieved of any additional requirements of Appendix H part II.1. as of the applicable date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities that have been implemented in accordance with the requirements of Appendix H part II.1. as of the applicable date to reduce phosphorus in its discharges, including implementation schedules for non structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix H part 11.1. required to be done prior to the date of determination or the date of the approved TMDL, including ongoing implementation of identified non- structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications. Page 7 of 14 MA MS4 General Permit Appendix H III. Discharges to water quality limited waterbodies where bacteria or pathogens is the cause of the impairment 1. Consistent with part 2.2.2.c.i. of the permit, permittees that discharge to waterbodies that are water quality limited due to bacteria or pathogens, without an EPA approved TMDL, are subject to the following additional requirements to address bacteria or pathogens in their stormwater discharges. 2. Additional or Enhanced BMPs a. The permittee remains subject to the requirements of part 2.3. of the permit and shall include the following enhancements to the BMPs required by part 2.3 of the permit: Part 2.3.2. Public Education and outreach: The permittee shall supplement its Residential program with an annual message encouraging the proper management of pet waste, including noting any existing ordinances where appropriate. The permittee or its agents shall disseminate educational materials to dog owners at the time of issuance or renewal of a dog license, or other appropriate time. Education materials shall describe the detrimental impacts of improper management of pet waste, requirements for waste collection and disposal, and penalties for non-compliance. The permittee shall also provide information to owners of septic systems about proper maintenance in any catchment that discharges to a water body impaired for bacteria or pathogens. All public education messages can be combined with requirements of Appendix H part I and II as well as Appendix F part A.III, A.IV, AN, B.I, B.II and B.III where appropriate. ii. Part 2.3.4 Illicit Discharge: The permittee shall implement the illicit discharge program required by this permit. Catchments draining to any waterbody impaired for bacteria or pathogens shall be designated either Problem Catchments or HIGH priority in implementation of the IDDE program. 3. At any time during the permit term the permittee may be relieved of additional requirements in Appendix H part III.2. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The receiving water is determined to be no longer impaired due to bacteria or pathogens by MassDEP and EPA concurs with such a determination. ii. An EPA approved TMDL for the receiving water indicates that no additional stormwater controls are necessary for the control of bacteria or pathogens from the permittee's discharge based on wasteload allocations as part of the approved TMDL. iii. The permittee's discharge is determined to be below applicable water quality criteria' and EPA agrees with such a determination. The permittee shall submit data to EPA that accurately characterizes the concentration of bacteria or pathogens in their discharge. The characterization shall include water quality ' Applicable water quality criteria are the state standards that have been federally approved as of the effective date of this permit and are compiled by EPA at hlW://www.epa.gov/waterscience/standards/wgslibrar� Page 8 of 14 MA MS4 General Permit Appendix H and flow data sufficient to accurately assess the concentration of bacteria or pathogens in all seasons during storm events of multiple sizes and for the duration of the storm events including the first flush, peak storm flow and return to baseflow. b. In such a case, the permittee shall document the date of the determination, date of approved TMDL or date of EPA concurrence that the discharge meets water quality criteria in its SWMP and is relieved of any additional requirements of Appendix H part II1.2. as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix H part III.2. to date to reduce bacteria or pathogens in its discharges, including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs ii. The permittee shall continue to implement all requirements of Appendix H part II1.3. required to be done prior to the date of determination date, date of approved TMDL, or date of EPA concurrence that the discharge meets water quality criteria, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications Page 9 of 14 MA MS4 General Permit Appendix H IV. Discharges to water quality limited waterbodies where chloride is the cause of the impairment 1. Consistent with part 2.2.2.c.i. of the permit, permittees that discharge to waterbodies that are water quality limited due to chloride, without an EPA approved TMDL, are subject to the following additional requirements to address chloride in their stormwater discharges. 2. Permittees discharging to a waterbody listed as impaired due to chloride in categories 5 or 4b on the Massachusetts Integrated Report of waters listed pursuant to Clean Water Act sections 303(d) and 305(b) shall develop a Salt Reduction Plan that includes specific actions designed to achieve salt reduction on municipal roads and facilities, and on private facilities that discharge to its MS4 in the impaired catchment(s). The Salt Reduction Plan shall be completed within three years of the effective date of the permit and include the BMPs in part IVA. below. The Salt Reduction Plan shall be fully implemented five years after the effective date of the permit. Permittees that, during the permit term, become aware that their discharge is to a waterbody that is impaired due to chloride must update their Salt Reduction Plan within 60 days of becoming aware of the situation to include salt reduction practices targeted at lowering chloride in discharges to the impaired waterbody. If the permittee does not have a Salt Reduction Plan already in place, then the permittee shall complete a Salt Reduction Plan that includes the BMPs in part IV 4) below within 3 years of becoming aware of the situation and fully implement the Salt Reduction Plan within 5 years of becoming aware of the situation. 4. Additional or Enhanced BMPs a. For municipally maintained surfaces: Tracking of the types and amount of salt applied to all permittee owned and maintained surfaces and reporting of salt use beginning in the year of the completion of the Salt Reduction Plan in the permittee's annual reports; ii. Planned activities for salt reduction on municipally owned and maintained surfaces, which shall include but are not limited to the following unless the permittee determines one or more of the following is not applicable to its system and documents that determination as part of the Salt Reduction Plan: • Operational changes such as pre -wetting, pre -treating the salt stockpile, increasing plowing prior to de-icing, monitoring of road surface temperature, etc.; • Implementation of new or modified equipment providing pre - wetting capability, better calibration rates, or other capability for minimizing salt use; • Training for municipal staff and/or contractors engaged in winter maintenance activities; • Adoption of guidelines for application rates for roads and parking lots (see Winter Parking Lot and Sidewalk Maintenance Page 10 of 14 MA MS4 General Permit Appendix H Manual (Revised edition June 2008) http://www.pca.state.mn.us/publications/parkinglotmgEpAl.pdf, and the application guidelines on page 17 of Minnesota Snow and Ice Control: Field Handbookfor Snow Operators (September 2012) http://www.mnitap.unm.edWpublications/handbooks/documents /snowice.pdf for examples); • Regular calibration of spreading equipment; • Designation of no -salt and/or low salt zones; • Measures to prevent exposure of salt stockpiles (if any) to precipitation and runoff; and • An estimate of the total tonnage of salt reduction expected by each activity. b. For privately maintained facilities that discharge to the MS4: i. Establish an ordinance, bylaw, or other regulatory mechanism requiring measures to prevent exposure of any salt stockpiles to precipitation and runoff at all commercial and industrial properties within the regulated area. ii. Part 2.3.2. Public Education and Outreach: The permittee shall supplement its Commercial/Industrial education program with an annual message to private road salt applicators and commercial and industrial site owners on the proper storage and application rates of winter deicing material. The educational materials shall be disseminated in the November/December timeframe and shall describe steps that can be taken to minimize salt use and protect local waterbodies. iii. Part 2.3.6, Stormwater Management in New Development and Redevelopment — establish procedures and requirements to minimize salt usage and require the use of salt alternatives where the permittee deems necessary. c. The completed Salt Reduction Plan shall be submitted to EPA along with the annual report following the Salt Reduction Plan's completion. Each subsequent annual report shall include an update on Plan implementation progress, any updates to the Salt Reduction Plan deemed necessary by the permittee, as well as the types and amount of salt applied to all permittee owned and maintained surfaces. 5. At any time during the permit term the permittee may be relieved of additional requirements in Appendix H part IV as follows: a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The receiving water is determined to be no longer impaired due to chloride by MassDEP and EPA concurs with such a determination. ii. An EPA approved TMDL for the receiving water indicates that no additional stormwater controls are necessary for the control of chloride from the Page 11 of 14 MA MS4 General Permit Appendix H permittee's discharge based on wasteload allocations as part of the approved TMDL. iii. The permittee's discharge is determined to be below applicable water quality criteria' and EPA agrees with such a determination. The permittee shall submit data to EPA that accurately characterizes the concentration of chloride in their discharge during the deicing season (November — March). The characterization shall include water quality and flow data sufficient to accurately assess the concentration of chloride in the deicing season during storm events of multiple sizes and for the duration of the storm events including the first flush, peak storm flow and return to baseflow and include samples collected during deicing activities. b. In such a case, the permittee shall document the date of the determination, date of approved TMDL or date of EPA concurrence that the discharge meets water quality criteria in its SWMP and is relieved of any additional requirements of Appendix H part IV as of that date and the permittee shall comply with the following: i. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix H part IV to date to reduce chloride in its discharges, including implementation schedules for non- structural BMPs ii. The permittee shall continue to implement all requirements of Appendix H part IV required to be done by the date of determination date, date of approved TMDL, or date of EPA concurrence that the discharge meets water quality criteria, including ongoing implementation of identified non-structural BMPs ' Applicable water quality criteria are the state standards that have been federally approved as of the effective date of this permit and are compiled by EPA at hlW://www.epa.gov/waterscience/standards/wgslibrar� Page 12 of 14 MA MS4 General Permit Appendix H V. Discharges to water quality limited waterbodies and their tributaries where solids, oil and grease (hydrocarbons), or metals is the cause of the impairment 1. Consistent with part 2.2.2.c.i. of the permit, permittees that discharge to waterbodies that are water quality limited due to solids, metals, or oil and grease (hydrocarbons), without an EPA approved TMDL, are subject to the following additional requirements to address solids, metals, or oil and grease (hydrocarbons) in their stormwater discharges. 2. Additional or Enhanced BMPs a. The permittee remains subject to the requirements of part 2.3. of the permit and shall include the following enhancements to the BMPs required by part 2.3 of the permit: Part 2.3.6, Stormwater Management in New Development and Redevelopment: stormwater management systems designed on commercial and industrial land use area draining to the water quality limited waterbody shall incorporate designs that allow for shutdown and containment where appropriate to isolate the system in the event of an emergency spill or other unexpected event. EPA also encourages the permittee to require any stormwater management system designed to infiltrate stormwater on commercial or industrial sites to provide the level of pollutant removal equal to or greater than the level of pollutant removal provided through the use of biofiltration of the same volume of runoff to be infiltrated, prior to infiltration. ii. Part 2.3.7, Good House Keeping and Pollution Prevention for Permittee Owned Operations: increased street sweeping frequency of all municipal owned streets and parking lots to a schedule determined by the permittee to target areas with potential for high pollutant loads. This may include, but is not limited to, increased street sweeping frequency in commercial areas and high density residential areas, or drainage areas with a large amount of impervious area. Prioritize inspection and maintenance for catch basins to ensure that no sump shall be more than 50 percent full. Clean catch basins more frequently if inspection and maintenance activities indicate excessive sediment or debris loadings. Each annual report shall include the street sweeping schedule determined by the permittee to target high pollutant loads. 3. At any time during the permit term the permittee may be relieved of additional requirements in Appendix H part V.2. applicable to it when in compliance with this part. a. The permittee is relieved of its additional requirements as of the date when one of the following criteria are met: i. The receiving water is determined to be no longer impaired due to solids, metals, or oil and grease (hydrocarbons) by MassDEP and EPA concurs with such a determination. ii. An EPA approved TMDL for the receiving water indicates that no additional stormwater controls are necessary for the control of solids, metals, or oil and grease (hydrocarbons) from the permittee's discharge based on wasteload allocations as part of the approved TMDL. Page 13 of 14 MA MS4 General Permit Appendix H iii. The permittee's discharge is determined to be below applicable water quality criteria and EPA agrees with such a determination 3. The permittee shall submit data to EPA that accurately characterizes the concentration of bacteria or pathogens in their discharge. The characterization shall include water quality and flow data sufficient to accurately assess the concentration of bacteria or pathogens in all seasons during storm events of multiple sizes and for the duration of the storm events including the first flush, peak storm flow and return to baseflow. b. In such a case, the permittee shall document the date of the determination, date of approved TMDL or date of EPA concurrence that the discharge meets water quality criteria in its SWMP and is relieved of any additional requirements of Appendix H part V.2. as of that date and the permittee shall comply with the following: iv. The permittee shall identify in its SWMP all activities implemented in accordance with the requirements of Appendix H part V.2. to date to reduce solids, metals, or oil and grease (hydrocarbons) in its discharges, including implementation schedules for non-structural BMPs and any maintenance requirements for structural BMPs v. The permittee shall continue to implement all requirements of Appendix H part V.3. required to be done by the date of determination date, date of approved TMDL, or date of EPA concurrence that the discharge meets water quality criteria, including ongoing implementation of identified non-structural BMPs and routine maintenance and replacement of all structural BMPs in accordance with manufacturer or design specifications 3 Applicable water quality criteria are the state standards that have been federally approved as of the effective date of this permit and are compiled by EPA at http://www.epa.gov/waterscience/standards/wgslibrgr / Page 14 of 14 Attachment 1 to Appendix H ATTACHMENT 1 TO APPENDIX H The estimates of nitrogen load reductions resulting from BMP installation are intended for informational purposes only and there is no associated permittee-specific required nitrogen load reduction in the Draft Permit. Nitrogen load reduction estimates calculated consistent with the methodologies below may be used by the permittee to comply with future permit requirements providing the EPA determines the calculated reductions are appropriate for demonstrating compliance with future permit requirements. This attachment provides the method and an example to calculate the BMP nitrogen load as well as methods to calculate nitrogen load reductions for structural BMPs in an impaired watershed. BMP N Load: The BMP N Load is the annual nitrogen load from the drainage area to each proposed or existing BMP used by permittee. This measure is used to estimate the amount of annual nitrogen load that the BMP will receive or treat (BMP N Load). To calculate the BMP N Load for a given BMP: 1) Determine the total drainage area to the BMP and sort the total drainage area into two categories: total impervious area (IA) and total pervious area (PA); 2) Calculate the nitrogen load associated with impervious area (N Load 1A) and the pervious area (N Load PA) by multiplying the IA and PA by the appropriate land use -based nitrogen load export rate provided in Table 1; and 3) Determine the total nitrogen load to the BMP by summing the calculated impervious and pervious subarea nitrogen loads. Table 1: Annual nitrogen load export rates Nitrogen Load Nitrogen Load Nitrogen Source Category by Land Surface Export Rate, Export Rate, Land Use Cover lbs/ac/ r k /ha/ r All Impervious Cover Impervious 14.1 15.8 *Developed Land Pervious (DevPERV)- HSG A Pervious 0.3 0.3 *Developed Land Pervious (DevPERV)- HSG B Pervious 1.2 1.3 *Developed Land Pervious (DevPERV) — HSG C Pervious 2.4 2.7 *Developed Land Pervious (DevPERV) - HSG C/D Pervious 3.0 3.4 *Developed Land Pervious (DevPERV) - HSG D Pervious 3.7 4.1 Notes: For pervious areas, if the hydrologic soil group (HSG) is known, use the appropriate value from this table. If the HSG is not known, assume HSG C/D conditions for the nitrogen load export rate. Page 1 of 12 Attachment 1 to Appendix H Example 1 to determine nitrogen load to a proposed BMP when the contributing drainage area is 100% impervious: A permittee is proposing a storm water infiltration system that will treat runoff from 1.49 acres of impervious area. Table 1-1: Design parameters for Bio-filtration w/ ISR systems for Example 1 Components of representation Parameters Value Ponding Maximum depth 0.33 ft Surface area 645 ft Soil mix Depth 2.0 ft Porosity 0.24 Hydraulic conductivity 2.5 inches/hour Stone Reservoir (ISR) Depth 2.50 ft Porosity 0.42 Hydraulic conductivity 500 inches/hour ISR Volume: System Storage Volume Ratio 0.56 Orifices Diameter 12 in Installed 2.5 above impermeable soil layer Determine: A) Percent nitrogen load reduction (BMP Reduction %-N) for the specified bio-filtration w/ISR system and contributing impervious drainage area; and B) Nitrogen reduction in pounds that would be accomplished by the bio-filtration w/ISR system (BMP-Reduction lbs-N) Solution: 1) The BMP is a bio-filtration w/ISR system that will treat runoff from 1.49 acres of impervious area (IA = 1.49 acre); 2) The available storage volume capacity (ft) of the bio-filtration w/ISR system (BMP- Volume BMP-ft3) is determined using the surface area of the system, depth of ponding, the porosity of the filter media and the porosity of the stone reservoir: BMP-Volume BMP-ft' =Surface area x (pond maximum depth + (soil mix depth x soil mix porosity) + stone reservoir depth x gravel layer porosity)) =520ft2x(0.33 ft + (2.Oft x 0.24) + (2.5 ftx0.42)) = 1,200 ft3 3) The available storage volume capacity of the bio-filtration w/ISR system in inches of runoff from the contributing impervious area (BMP-Volume IA -in) is calculated using equation 1: BMP-Volume IA -in = (BMP-Volume ft3/ IA (acre) x 12 in/ft x 1 acre/43560 ft2 (Equation 1) Page 2 of 12 Attachment 1 to Appendix H Example 1 Continued: BMP-Volume iA_;,,= (1,200 ft3/1.49 acre) x 12 in/ft x 1 acre/43560 ft2 = 0.22 in 4) Using the Regional Performance Curve shown in Figure 1 for a bio-filtration w/ ISR system, a 61% nitrogen load reduction (BMP Reduction %-N) is determined for a bio- filtration w/ ISR systems sized for 0.22 in of runoff from 1.49 acres of impervious area; and 5) Calculate the nitrogen load reduction in pounds of nitrogen for the bio-filtration w/ISR system (BMP Reduction lb,-N) using the BMP Load calculation method shown above in Example 1 and the BMP Reduction %-N determined in step 4 by using equation 2. First, the BMP Load is determined as specified in Example 1: BMP Load = IA (acre) x 14.1 lb/ac/yr = 1.49 acres x 14.1 lbs/acre/yr = 21.0lbs/yr BMP Reduction ibs_N = BMP Load x (BMP Reduction %-N/100) (Equation 2) BMP Reduction ibs-N = 21 lbs/yr x (61/100) =12.8 lbs/yr Page 3 of 12 Attachment 1 to Appendix H Method to determine the nitrogen load reduction for a structural BMP with a known storage volume when the contributing drainage area has impervious and pervious surfaces Start 1. Determine BMP type and identify contributing impervious drainage area (IA) and pervious drainage area (PA) in acres 2. Calculate available BMP storage volume (BMP- Volumeft3) in cubic ft 3. Convert BMP storage volume into runoff from contributing impervious area (BMP-VolumePA-in) in inches 4. Calculate runoff volume from all pervious surfaces (BMP-VolumePA ft3) in cubic ft for an event with the size of BMP-VolumePA_,,, 5. Calculate BMP volume available for treating only impervious runoff by subtracting BMP-VolumePAft3 from BMP-Volumeft3, and convert BMP volume into inches of impervious surface runoff (BMP-Volume(,A-in)a) 6. Calculate percentage of differences between BMP- Volume(,A_ i„)a and BMP-VolumeiA_i„ Yes 7. Use BMP performance curve to determine the percentage of N load 8. Calculate the cumulative N load reductions by proposed BMP (BMP-Reductionjbs_N) in lbs Update the value of BMP-VolumePA_,,, with that of BMP- VolumepA_i„)a No Less than coi o Page 4 of 12 Attachment 1 to Appendix H Flow Chart 2 (previous page). Method to determine the nitrogen load reduction for a BMP with known storage volume when both pervious and impervious drainage areas are present. 1) Identify the type of structural BMP and characterize the contributing drainage area to the structural BMP by identifying the following information for the impervious and pervious surfaces: Impervious area (IA) - Area (acre) and export rate (Table 1) Pervious area (PA) - Area (acre) and runoff depth based on hydrologic soil group (HSG) and size of rainfall event. Table 2 provides values of runoff depth for various rainfall depths and HSGs. Soils are assigned to an HSG based on their permeability. HSG categories for pervious areas in the Watershed shall be estimated by consulting local soil surveys prepared by the National Resource Conservation Service (NRCS) or by a storm water professional evaluating soil testing results from the Watershed. If the HSG condition is not known, a HSG D soil condition should be assumed. Table 2: Developed Land Pervious Area Runoff Depths based on Precipitation depth and Hydrological Soil Groups (HSGs) Rainfall Depth, Inches Runoff Depth, inches Pervious HSG A/B Pervious HSG C Pervious HSG D 0.10 0.00 0.00 0.00 0.20 0.00 0.01 0.02 0.40 0.00 0.03 0.06 0.50 0.00 0.05 0.09 0.60 0.01 0.06 0.11 0.80 0.02 0.09 0.16 1.00 0.03 0.12 0.21 1.20 0.04 0.14 0.39 1.50 0.11 0.39 0.72 2.00 0.24 0.69 1.08 Notes: Runoff depths derived from combination of volumetric runoff coefficients from Table 5 of Small Storm Hydrology and Why it is Important for the Design of Stormwater Control Practices, Pitt, 1999 and using the Stormwater Management Model (SWMM) in continuous model mode for hourly precipitation data for Boston, MA, 1998-2002. 2) Determine the available storage volume (ft) of the structural BMP (BMP-Volume e) using the BMP dimensions and design specifications (e.g., maximum storage depth, filter media porosity); Page 5 of 12 Attachment 1 to Appendix H 3) To estimate the nitrogen load reduction of a BMP with a known storage volume capacity, it is first necessary to determine the portion of available BMP storage capacity (BMP- Volume ft3) that would treat the runoff volume generated from the contributing impervious area (IA) for a rainfall event with a depth of i inches (in). This will require knowing the corresponding amount of runoff volume that would be generated from the contributing pervious area (PA) for the same rainfall event (depth of i inches). Using equation 3 below, solve for the BMP capacity that would be available to treat runoff from the contributing imperious area for the unknown rainfall depth of i inches (see equation 4): BMP-Volume ft3 = BMP-Volume (iA_ft3)i + BMP-Volume (PA_ft3)i (Equation 3) Where: BMP-Volume ft3 = the available storage volume of the BMP BMP-Volume (IA_ft3)i = the available storage volume of the BMP that would fully treat runoff generated from the contributing impervious area for a rainfall event of size i inches BMP-Volume (PA-ft3)i = the available storage volume of the BMP that would fully treat runoff generated from the contributing pervious area for a rainfall event of size i inches Solving for BMP-Volume (IA_ft3)i: BMP-Volume (Ia_ft3)i = BMP-Volume ft3 - BMP-Volume (PA-ft3), (Equation 4) To determine BMP-Volume (IA_ft3)i, requires performing an iterative process of refining estimates of the rainfall depth used to calculate runoff volumes until the rainfall depth used results in the sum of runoff volumes from the contributing IA and PA equaling the available BMP storage capacity (BMP-Volume ft). For the purpose of estimating BMP performance, it will be considered adequate when the IA runoff depth (in) is within 5% IA runoff depth used in the previous iteration. For the first iteration (1), convert the BMP-Volume ft3 determined in step 2 into inches of runoff from the contributing impervious area (BMP Volume (IA-in)i) using equation 5. BMP-Volume (IA-in)i = (BMP-Volumeft3/ IA (acre)) x (12 in/ft /43,560 ft2/acre) (Equation 5); For iterations 2 through n (2...n), convert the BMP Volume (IA-ft3)2...n, determined in step 5a below, into inches of runoff from the contributing impervious area (BMP Volume (IA-in)2...n) using equation 6. BMP-Volume (IA_in)2...n= (BMP-Volume (IA_ft3)2...n / IA (acre)) x (12 in/ft /43,560 ft2/acre) (Equation 6); 4) For 1 to n iterations, use the pervious runoff depth information from Table 2 and equation 7 to determine the total volume of runoff (ft) from the contributing PA (BMP Volume Page 6 of 12 Attachment 1 to Appendix H PA_ft3) for a rainfall size equal to the sum of BMP-Volume (IA-in)i, determined in step 3. The runoff volume for each distinct pervious area must be determined. BMP Volume (PA-ft3)I... n = A f3 i(((f ), .. (, /acre -in) (Equation 7) 5) For iteration 1, estimate the portion of BMP Volume that is available to treat runoff from only the IA by subtracting BMP-Volume PA-ft3, determined in step 4, from BMP-Volume ft3, determined in step 2, and convert to inches of runoff from IA (see equations 8 and 9): BMP-Volume (,A_ft3)2 = ((BMP-Volumeft3- BMP Volume (PA_ft3)1) (Equation 8) BMP-Volume (IA_in)2 = (BMP-Volume (iA_ft3)2/IA (acre)) x (12 in/ft x 1 acre/43,560 ft2) (Equation 9) If additional iterations (i.e., 2 through n) are needed, estimate the portion of BMP volume that is available to treat runoff from only the IA (BMP-Volume (1,_in)3..n+i) by subtracting BMP Volume (PA-ft3)2..n, determined in step 4, from BMP Volume (IA-ft3)3..n+I, determined in step 5, and by converting to inches of runoff from IA using equation 9): 6) For iteration A (an iteration between 1 and n+1), compare BMP Volume (IA-in)a to BMP Volume (IA-in)a-i determined from the previous iteration (a-1). If the difference in these values is greater than 5% of BMP Volume (IA-in)a then repeat steps 4 and 5, using BMP Volume (IA-in)a as the new starting value for the next iteration (a+1). If the difference is less than or equal to 5 % of BMP Volume (IA-in)a then the permittee may proceed to step 7. 7) Determine the % nitrogen load reduction for the structural BMP (BMP Reduction %-N) using the appropriate BMP curve on Figure 1 or 2 and the BMP-Volume (IA-in)n calculated in the final iteration of step 5; and 8) Calculate the nitrogen load reduction in pounds of nitrogen for the structural BMP (BMP Reduction ibs-N) using the BMP Load as calculated above in Example 1 and the percent nitrogen load reduction (BMP Reduction %-N) determined in step 7 by using equation 10: BMP Reduction lbs-N = BMP Load x (BMP Reduction %-N/100) (Equation 10) Example 2: Determine the nitrogen load reduction for a structural BMP with a known design volume when the contributing drainage area has impervious and pervious surfaces A permittee is considering an infiltration basin to capture and treat runoff from a portion of the Watershed draining to the impaired waterbody. The contributing drainage area is 16.55 acres and is 71% impervious. The pervious drainage area (PA) is 80% HSG D and 20% HSG C. An infiltration basin with the following specifications can be placed at the down -gradient end of the contributing drainage area where soil testing results indicates an infiltration rate (IR) of 0.28 in/hr: Page 7 of 12 Attachment 1 to Appendix H con Bottom Top Maximum Design Infiltration Structure area surface pond depth storage Rate (acre) area (acre) (ft) volume (ft3) (in/hr) Infiltration basin 0.65 0.69 1.65 48,155 0.28 Determine the: A) Percent nitrogen load reduction (BMP Reduction %-N) for the specified infiltration basin and the contributing impervious and pervious drainage area; and B) Nitrogen reduction in pounds that would be accomplished by the BMP (BMP- Reduction lbs_N) Solution: 1) A surface infiltration basin is being considered. Information for the contributing impervious (IA) and pervious (PA) areas are summarized in below. Impervious area characteristics ID % Impervious Area (acre) IA1 100 11.75 Pervious area characteristics ID Area (acre) Hydrologic Soil Group (HSG) PA1 3.84 D PA2 0.96 C 2) The available storage volume (ft) of the infiltration basin (BMP-Volume ft) is determined from the design details and basin dimensions; BMP-Volume ft3 = 48,155 ft3. 3) To determine what the BMP design storage volume is in terms of runoff depth (in) from IA, an iterative process is undertaken: Solution Iteration 1 For the first iteration (1), the BMP-Volumeft3 is converted into inches of runoff from the contributing impervious area (BMP Volume (I,_in)1) using equation 5. BMP Volume (IA_in)i = (48,155 W/ 11.75 acre) x (12 in/ft /43,560 ft2/acre) = 1.13 in Page 8 of 12 Attachment 1 to Appendix H Solution Continued: 4-1) The total volume of runoff (ft3) from the contributing PA (BMP Volume PA-ft3) for a rainfall size equal to the sum of BMP Volume (IA-in)i determined in step 3 is determined for each distinct pervious area using the information from Table 2 and equation 7. Interpolation was used to determine runoff depths. BMP Volume (PA-ft3)I = ((3.84 acre x (0.33 in) + (0.96 acre x (0.13 in)) x 3,630 ft3/acre-in = 5052 ft3 5-1) For iteration 1, the portion of BMP Volume that is available to treat runoff from only the IA is estimated by subtracting the BMP Volume (PA-ft3)I, determined in step 4-1, from BMP Volumeft3, determined in step 2, and converted to inches of runoff from IA: BMP Volume _ft3) 2 = 48,155 ft3 — 5052 ft3 = 43,103 ft3 BMP Volume (IA -in) 2 = (43,103 ft3/11.75 acre) x (12 in/ft x 1 acre/43,560 ft2) = 1.01 in 6-1) The % difference between BMP Volume (IA -in) 2, 1.01 in, and BMP Volume (IA-in)I, 1.13 in is determined and found to be significantly greater than 5%: % Difference = ((1.13 in — 1.01 in)/1.01 in) x 100 = 12% Therefore, steps 4 through 6 are repeated starting with BMP Volume (IA -in) 2 = 1.01 in. Solution Iteration 2 4-2) BMP-Volume (PA-ft3)2= ((3.84 acre x 0.21 in) + (0.96 acre x 0.12 in)) x 3,630 ft3/acre-in = 3,358 ft3 5-2) BMP-Volume (IA-ft3) 3 = 48,155 ft3 — 3,358 ft3 = 44,797 ft3 BMP-Volume (IA -in) 3 = (44,797 ft3/11.75 acre) x (12 in/ft x 1 acre/43,560 ft2) = 1.05 in 6-2) % Difference = ((1.05 in —1.01 in)/1.05 in) x 100 = 4% The difference of 4% is acceptable. Page 9 of 12 Attachment 1 to Appendix H Solution Continued: 7) The % nitrogen load reduction for the infiltration basin (BMP Reduction Rio-N) is determined by using the RR treatment curve in Figure 2 and the treatment volume (BMP- Volume Net is -in = 1.05 in) calculated in step 5-2 and is BMP Reduction pro-N = 56%. 9) The nitrogen load reduction in pounds of nitrogen (BMP-Reduction ibs-N) for the propo: infiltration basin is calculated by using equation 11 with the BMP Load (as determined by the procedure in Example 4-1) and the N target of 56%. BMP-Reduction ms-N = BMP N Load x (N target /100) (Equation 11) Following example 1, the BMP load is calculated: BMP N Load = (IA x impervious cover nitrogen export loading rate) + (PAxsG n x pervious cover nitrogen export loading rate, HSG D + (PAxsG c x pervious cover nitrogen export loading rate, HSG C) = (16.55 acre x 15.4 lbs/acre/yr) + (3.84 acre x 3.7 lbs/acre/yr) + (0.96 acre x 2.4 lbs/acre/yr) = 271.4 lbs/yr BMP-Reduction ibs_N = 275.13 lbs/yr x 56/100 152.0 lbs/yr Page 10 of 12 Attachment 1 to Appendix H Figure 1: Regional BMP Performance Curve for Annual Nitrogen Load Removal: System Design by the University of New Hampshire Stormwater Center (UNHSWC) 40 G U E Regiona0 oNMlp performance Curve. oio-fiitration with Mernai storage Reservoir QISR3 MR Vdume e 56 ToW System Stowage 10096 - - 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Physical Storage Capacity - Inches Runoff Depth from Impervious Area 21 Page 11 of 12 Attachment 1 to Appendix H Table 3. Classification of BMP to Determine Nitrogen Reduction) Structural BMP Classification Infiltration Trench Runoff Reduction (RR) Infiltration Basin or other surface infiltration practice Runoff Reduction (RR) Bioretention Practice Runoff Reduction (RR) Gravel Wetland System Stormwater Treatment (ST) Porous Pavement Runoff Reduction (RR) Wet Pond or wet detention basin Stormwater Treatment (ST) Dry Pond or detention basin Runoff Reduction (RR) Water Quality Swale Runoff Reduction (RR) 'Recommendations of the Expert Panel to Define Removal Rates for New State Stormwater Performance Standards http:Hchesapeakestormwater.net/wp-content/plugins/download-monitor/download.php?id=25, Retrieved 12/14/2012 1o0°a a5% 9000, 8.5% 80% 75% C 65, i 'r O 60°o j d 45% 4U°0 z 35% r 0 30 =s% '?O°o 1� 1090 5% 00. Figure 2: Total Nitrogen Removal for RR and ST Practices Q 0.1 0.2 01 0.4 ().5 0.6 0.7 0.8 0. g 1 1.1 1.2 1.3 1.4 15 16 1 - 18 1 q ` 2.1 2.2 2.1 2..} 2.5 Runoff Depth Captured per Impei- ions Are (inches) Adopted from: Final CBP Approved Expert Panel Report on Stormwater Retrofits http://chesgpeakestormwater.net/M-content/plugins/download-monitor/download.php?id=25, Retrieved 12/14/2012 Page 12 of 12 APPENDIX D 2016 MS4 Notice of Intent .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Notice of Intent (NOI) for coverage under Small MS4 General Permit Page 1 of26 Part I: General Conditions General Information Name of Municipality or Organization: Watertown State: MA EPA NPDES Permit Number (if applicable): MAR041083 Primary MS4 Program Manager Contact Information Name: Matthew Shuman Title: Town Engineer Street Address Line 1: 124 Orchard Street Street Address Line 2: Watertown State: MA Zip Code: 02472 Email: mshuman@watertown-ma.gov Phone Number: (617) 972-6420 Fax Number: (617) 972-6402 Other Information Stormwater Management Program (SWMP) Location To Be Completed During Permit Year 1 and Posted to Town Website (2018-2019). Eligibility Determination Endangered Species Act (ESA) Determination Complete? Yes Eligibility Criteria (check all that apply): ❑ A ❑ B 0 C National Historic Preservation Act (NHPA) Determination Complete? Yes Eligibility Criteria (check all that apply): 0 A ❑ B ❑ C 0 Check the box if your municipality or organization was covered under the 2003 MS4 General Permit MS4 Infrastructure (if covered underthe2003 permit) Estimated Percent of Outfall Map Complete? 100% If 100% of 2003 requirements not met, enter an (Part 11,111, W or V, Subpart B.3.(a.) of2003 permit) estimated date of completion (MM/DD/YY): Jeb address where MS4 map is published: outfall map is unavailable on the internet on electronic paper copy of the outfall map must be included with OI submission (see section V for submission options) http://www.watertowndpw.org/DocumentCenterNiew/I 55/Drainage-Outfa I I-M a p- PDF?bidld= Regulatory Authorities (if covered under the 2003 permit) Illicit Discharge Detection and Elimination (IDDE) Authority Adopted? Yes Effective Date or Estimated 05/11 /11 (Part 11,111, W or V, Subpart B.3.(b.) of2003 permit) Date of Adoption (MM/DD/YY): Construction/Erosion and Sediment Control (ESC) Authority Adopted? Yes Effective Date or Estimated 02/23/16 (Part II,III,IV or V, Subpart B.4. (a.) of 2003 permit) Date of Adoption (MM/DD/YY): Post- Construction Stormwater Management Adopted? 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O i O O — Q Qro Q Q i i O C C C " a Y Y Y c a) cr 0- O ++ O Y O Y L � L C N p1 O 7 � G t a R V � Q- 41 m Q Q N V) � U> " � 41 � N V i N � � O L L Ll Ll- J V % \ k 2 / � � / E � � CY t 4-1 2 41 41 � cc « E & E a) m � D 3 % k 4- � § � ƒ ( ƒ E g§e c c w \/E k£/ f2\ /kCL 2 f § ¢52 2 t +1 �ƒ# y � a 2t2 § [ � y § \±� f o E Q-\/ x E g $ e cc, /E2 ±/ �kk w k § 2Et 2 � k ( \ r E / / k § 0 kfg0 U. t«' � E 2 » e 3 » =�$2 40 f Om4 � ƒ \ \ ■ 6 ) / e ® o mo o LA/ƒ / / 2 R E [ ƒ�/$ § a 55/$ _L. / $ 2 �/ �\ E - �\ p ° } ■ 2 6 2 2 - � /\ - U � / ( � f 2 L Ll L Ll L LU L LU L LLI LIULI c I \ \ � § / � \ & v \ \ 5 e 3 { \ k a 0 — /\ M \ \ 2 t\ ■ \\ \ \ \cc § $ 2 � \ Notice of Intent (NOI) for coverage under Small MS4 General Permit Page 25 of26 Part IV: Notes and additional information Use the space below to indicate the part(s) of 2.2.1 and 2.2.2 that you have identified as not applicable to your MS4 because you do not discharge to the impaired water body or a tributary to an impaired water body due to nitrogen or phosphorus. Provide all supporting documentation below or attach additional documents if necessary. Also, provide any additional information about your MS4 program below. Through consultation with the US Fish & Wildlife, it was determined that the only threatened species within Watertown is the northern long-eared bat. Actions currently proposed within this Notice of Intent will not affect this species. As Best Management Practices are constructed in the future, the Town will consult with US Fish & Wildlife prior to construction activities. The Town does not have any direct discharges to an unnamed tributary to the Charles River locally known as Laundry Brook (MA72-30), which has impairments for phosphorus and turbidity/TSS requiring the development of a TMDL and is therefore not subject to the requirements of Part III, Actions for Meeting Requirements Related to Impaired Waters for the impairments associated with this receiving water. Notice of Intent (NOI) for coverage under Small MS4 General Permit Page 26 of 26 Part V: Certification 1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, I certify that the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Name: Michael J. Driscoll Title: Town Manager Date: OC`� S Signature: [To be signed according to Appendix B, Subparagraph B.11, Standard Conditions] Note: When prompted during signing, save the document under a new file name h FYSJi &WkkJ)U&*. Na -" United States Department of the Interiorxa FISH AND WILDLIFE SERVICE %o New England Ecological Services Field Office 'aRCH 3�,e 70 Commercial Street, Suite 300 Concord, NH 03301-5094 Phone: (603) 223-2541 Fax: (603) 223-0104 http://www.fws.,2ov/newen le and In Reply Refer To: August 16, 2018 Consultation Code: 05EINE00-2018-SLI-2777 Event Code: 05E1NE00-2018-E-06504 Project Name: General BMP installation and MS4 permit compliance Subject: List of threatened and endangered species that may occur in your proposed project location, and/or may be affected by your proposed project To Whom It May Concern: The enclosed species list identifies threatened, endangered, proposed and candidate species, as well as proposed and final designated critical habitat, that may occur within the boundary of your proposed project and/or may be affected by your proposed project. The species list fulfills the requirements of the U.S. Fish and Wildlife Service (Service) under section 7(c) of the Endangered Species Act (Act) of 1973, as amended (16 U.S.C. 1531 et seq.). New information based on updated surveys, changes in the abundance and distribution of species, changed habitat conditions, or other factors could change this list. Please feel free to contact us if you need more current information or assistance regarding the potential impacts to federally proposed, listed, and candidate species and federally designated and proposed critical habitat. Please note that under 50 CFR 402.12(e) of the regulations implementing section 7 of the Act, the accuracy of this species list should be verified after 90 days. This verification can be completed formally or informally as desired. The Service recommends that verification be completed by visiting the ECOS-IPaC website at regular intervals during project planning and implementation for updates to species lists and information. An updated list may be requested through the ECOS-IPaC system by completing the same process used to receive the enclosed list. The purpose of the Act is to provide a means whereby threatened and endangered species and the ecosystems upon which they depend may be conserved. Under sections 7(a)(1) and 7(a)(2) of the Act and its implementing regulations (50 CFR 402 et seq.), Federal agencies are required to utilize their authorities to carry out programs for the conservation of threatened and endangered species and to determine whether projects may affect threatened and endangered species and/or designated critical habitat. 08/16/2018 Event Code: 05E1NE00-2018-E-06504 2 A Biological Assessment is required for construction projects (or other undertakings having similar physical impacts) that are major Federal actions significantly affecting the quality of the human environment as defined in the National Environmental Policy Act (42 U.S.C. 4332(2) (c)). For projects other than major construction activities, the Service suggests that a biological evaluation similar to a Biological Assessment be prepared to determine whether the project may affect listed or proposed species and/or designated or proposed critical habitat. Recommended contents of a Biological Assessment are described at 50 CFR 402.12. If a Federal agency determines, based on the Biological Assessment or biological evaluation, that listed species and/or designated critical habitat may be affected by the proposed project, the agency is required to consult with the Service pursuant to 50 CFR 402. In addition, the Service recommends that candidate species, proposed species and proposed critical habitat be addressed within the consultation. More information on the regulations and procedures for section 7 consultation, including the role of permit or license applicants, can be found in the 'Endangered Species Consultation Handbook" at: http://www.fws.gov/endangered/esa-library/Pdf/TOC-GLOS.PDF Please be aware that bald and golden eagles are protected under the Bald and Golden Eagle Protection Act (16 U.S.C. 668 et seq.), and projects affecting these species may require development of an eagle conservation plan (http://www.fws.gov/windenergy/ eagle_guidance.html). Additionally, wind energy projects should follow the wind energy guidelines (http://www.fws.gov/windenergy/) for minimizing impacts to migratory birds and bats. Guidance for minimizing impacts to migratory birds for projects including communications towers (e.g., cellular, digital television, radio, and emergency broadcast) can be found at: http:// www.fws.gov/migratorybirds/CurrentBirdlssues/Hazards/towers/towers.htm; http:// www.towerkill.com; and http://www.fws.gov/migratorybirds/CurrentBirdIssues/Hazards/towers/ comtow.html. We appreciate your concern for threatened and endangered species. The Service encourages Federal agencies to include conservation of threatened and endangered species into their project planning to further the purposes of the Act. Please include the Consultation Tracking Number in the header of this letter with any request for consultation or correspondence about your project that you submit to our office. Attachment(s): • Official Species List 08/16/2018 Event Code: 05E1NE00-2018-E-06504 Official Species List This list is provided pursuant to Section 7 of the Endangered Species Act, and fulfills the requirement for Federal agencies to "request of the Secretary of the Interior information whether any species which is listed or proposed to be listed may be present in the area of a proposed action". This species list is provided by: New England Ecological Services Field Office 70 Commercial Street, Suite 300 Concord, NH 03301-5094 (603)223-2541 08/16/2018 Event Code: 05E1NE00-2018-E-06504 2 Project Summary Consultation Code: 05EINE00-2018-SLI-2777 Event Code: 05E1NE00-2018-E-06504 Project Name: General BMP installation and MS4 permit compliance Project Type: LAND - MANAGEMENT PLANS Project Description: Determination of criterion C for NOI compliance under the 2016 small MS4 permit. Project Location: Approximate location of the project can be viewed in Google Maps: https: www.aooale.com/maps/place/42.37249415257323N71.1758948834296W r --: - 1410C1TOCd i r- on7ervill - W 7 b�� igl rz Newton . t ; Counties: Middlesex, MA I Suffolk, MA 08/16/2018 Event Code: 05E1NE00-2018-E-06504 Endangered Species Act Species There is a total of 1 threatened, endangered, or candidate species on this species list. Species on this list should be considered in an effects analysis for your project and could include species that exist in another geographic area. For example, certain fish may appear on the species list because a project could affect downstream species. IPaC does not display listed species or critical habitats under the sole jurisdiction of NOAA Fisheriesl, as USFWS does not have the authority to speak on behalf of NOAA and the Department of Commerce. See the "Critical habitats" section below for those critical habitats that lie wholly or partially within your project area under this office's jurisdiction. Please contact the designated FWS office if you have questions. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an office of the National Oceanic and Atmospheric Administration within the Department of Commerce. Mammals NAME STATUS Northern Long-eared Bat Myotis septentrionalis Threatened No critical habitat has been designated for this species. Species profile: https://ecos.fws. oe v/ecp/species/9045 Critical habitats THERE ARE NO CRITICAL HABITATS WITHIN YOUR PROJECT AREA UNDER THIS OFFICE'S JURISDICTION. 's E0 STg2Z w o Q �Tqt PROZEG� VIA EMAIL May 30, 2019 Michael J. Driscoll Town Manager And; UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 1 Matthew Shuman Town Engineer 124 Orchard Street Watertown, MA. 02472 mshuman@watertown-ma.gov 5 POST OFFICE SQUARE, SUITE 100 BOSTON, MA 02109-3912 Re: National Pollutant Discharge Elimination System Permit ID #: MAR041083, City of Watertown Dear Matthew Shuman: The 2016 NPDES General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems in Massachusetts (MS4 General Permit) is a jointly issued EPA-MassDEP permit. Your Notice of Intent (NOI) for coverage under this MS4 General Permit has been reviewed by EPA and appears to be complete. You are hereby granted authorization by EPA and MassDEP to discharge stormwater from your MS4 in accordance with the applicable terms and conditions of the MS4 General Permit, including all relevant and applicable Appendices. This authorization to discharge expires at midnight on June 30, 2022. For those permittees that certified Endangered Species Act eligibility under Criterion C in their NOI, this authorization letter also serves as EPA's concurrence with your determination that your discharges will have no effect on the listed species present in your action area, based on the information provided in your NOI. As a reminder, your first annual report is due by September 30, 2019 for the reporting period from May 1, 2018 through June 30, 2019. Information about the permit and available resources can be found on our website: https://www.epa.gov/npdes-permits/massachusetts-small-ms4- eg neral-permit. Should you have any questions regarding this permit please contact Newton Tedder at tedder.newtonkepa.gov or (617) 918-1038. Sincerely, Thelma Murphy, Chief Stormwater and Construction Permits Section Office of Ecosystem Protection United States Environmental Protection Agency, Region 1 and; Lealdon Langley, Director Wetlands and Wastewater Program Bureau of Water Resources Massachusetts Department of Environmental Protection APPENDIX E 2003 MS4 Annual Reports Reference .................................................................................................................................................................. westonandsampson.com Weston ® Sampson 2003 MS4 PERMIT ANNUAL REPORTS REFERENCE Year 2 Annual Report (2004-2005) https://www3.epa.gov/region 1 /npdes/stormwater/assets/pdfs/ma/reports/2005/Watertownma05rpt. jDdf Year 3 Annual Report (2005-2006) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2006/Watertown06ar.pdf Year 4 Annual Report (2006-2007) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2007/Watertown07.pdf Year 5 Annual Report (2007-2008) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2008/Watertown08.pdf Year 6 Annual Report (2008-2009) httos://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2009/Watertown09.odf Year 7 Annual Report (2009-2010) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2010/Watertownl 0.pdf Year 8 Annual Report (2010-2011) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2011 /Watertown 11. pdf Year 9 Annual Report (2011-2012) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2012/Watertown12.pdf Year 10 Annual Report (2012-2013) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2013/Watertown13.pdf Year 11 Annual Report (2013-2014) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2014/Watertown14.pdf Year 12 Annual Report (2014-2015) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2015/Watertown15.pdf Year 13 Annual Report (2015-2016) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2016/Watertown16.pdf Year 14 Annual Report (2016-2017) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2017/Watertown17.pdf Year 15 Annual Report (2017-2018) https://www3.epa.gov/regionl /npdes/stormwater/assets/pdfs/ma/reports/2018/Watertown18.pdf APPENDIX F MS4 Checklists by Permit Year .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Checklist for Year 1 MS4 Permit Requirements — Watertown, MA Completion Permit Requirement Task Section for Completed? Due Date Reference 10/1/2018 Notice of Intent (NOI) Prepare and Submit NOI for 1.7.2 & Yes Permit Coverage 90 days from Appendix E the permit effective date 6/30/2019 Stormwater Management Plan Develop written SWMP 1.10 (SWMP) 6/30/2019 Charles River Implement public education F.A.Ill.1.a.i.1 Pathogens TMDL initiatives; Rank tributary catchments as high for IDDE Investigation 6/30/2019 Public Education Fulfill public education initiatives aimed at target audiences as 2.3.2 outlined in the Town's NOI and this SWMP 6/30/2019 Public Participation Fulfill public participation initiatives aimed at target 2.3.3 audiences as outlined in the Town's NOI and this SWMP 6/30/2019 Sanitary Sewer Document all SSOs that have 2.3.4.4.b Overflow (SSO) occurred in the last 5 years Inventory 6/30/2019 Illicit Discharge Update existing written IDDE Detection and plan as needed to satisfy permit 2.3.4.6 Elimination (IDDE) requirements. Plan 6/30/2019 Catchment Delineate outfall & 2.3.4.5 Yes Delineation interconnection catchment areas. 6/30/2019 Catchment Assess and rank the potential for 2.3.4.7 Yes Prioritization & all catchments to have illicit Ranking discharges. 6/30/2019 IDDE Continue to prohibit illicit Yes Ordinance/Bylaw discharges as outlined in the 2.3.4.a Town's Illicit Discharge Ordinance, and take enforcement actions as needed. 6/30/2019 IDDE Employee Continue to train municipal Yes Training employees on illicit discharge 2.3.4.11 detection and monitoring. 6/30/2019 Construction Site Create written procedures for Runoff Control inspection of construction sites Regulatory for proper sediment & erosion 2.3.5.c Updates/SOPs controls, and conducting site plan reviews. Incorporate requirements for waste control. Reference Stormwater Manual for Sediment & Erosion Control BMPs. 6/30/2019 Construction Standard Continue to make standard ESC Specifications and erosion and sediment control Detailed Drawings details available on the DPW 2.3.5.c website and distribute as needed, and continue to inspect construction sites for compliance. 6/30/2019 Street Sweeping Sweep streets a minimum of 2.3.7.a.iii.3 once a year in the spring. Include miles cleaned or volume or mass of material removed in the annual report. 6/30/2019 Catch Basin Cleaning Clean catch basins annually to 2.3.7.a.iii.3 ensure the no catch basin is more than 50% full. Report catch basins cleaned and volume of material removed annually. 6/30/2019 Winter Road Develop and implement winter 2.3.7.a.iii.5 Maintenance SOP road maintenance procedures including use and storage of sand/salt, and snow storage practices. 6/30/2019 Stormwater BMP Inspect all stormwater 2.3.7.a.iii.6 Inspection & treatment structures (BMPs) at Maintenance least annually and conduct maintenance as necessary. Track number of structures maintained and inspected annually. 6/30/2019 Update Emergency Review and update Emergency N/A Management Plan Management Plan as appropriate 6/30/2019 Integrated Pest Exclude pesticide use on Town N/A Management Program Properties Checklist for Year 2 MS4 Permit Requirements — Watertown, MA Completion Permit Requirement Task Section for Completed? Due Date Reference 6/30/2020 Stormwater Management Plan Update written SWMP 1.10 (SWMP) 6/30/2020 Charles River Perform legal analysis to ensure F.A.I Table Phosphorus TMDL authority to implement F-1 Item 1-1 Phosphorus Control Plan 6/30/2020 Charles River Implement public education F.A.Ill.1.a.i.1 Pathogens TMDL initiatives 6/30/2020 Charles River Oil & Ordinance to require spill Grease Impairment containment isolation for H.V.2.a.i Commercial/Industrial properties 6/30/2020 Public Education Fulfill public education initiatives aimed at target audiences as 2.3.2 outlined in the Town's NOI and this SWMP 6/30/2020 Public Participation Fulfill public participation initiatives aimed at target 2.3.3 audiences as outlined in the Town's NOI and this SWMP 6/30/2020 Update Drainage Map Update town -wide MS4 mapping 2.3.4.5 to include impaired waters, BMPs, interconnections, and open channel conveyances. 6/30/2020 IDDE Continue to prohibit illicit Ordinance/Bylaw discharges as outlined in the 2.3.4.a Town's Illicit Discharge Ordinance, and take enforcement actions as needed. 6/30/2020 IDDE Employee Continue to train municipal Training employees on illicit discharge 2.3.4.11 detection and monitoring. 6/30/2025 IDDE Investigation of Begin investigation of problem 2.3.4.8.a Problem Catchments catchments 6/30/2020 Post -Construction Update existing stormwater Stormwater Runoff regulations as needed to include 2.3.6.a.ii Control Regulatory compliance with the Stormwater Updates Management Standards, to meet retention and treatment requirements, to meet as -built requirements and provide for long term operation & maintenance of BMPs. 6/30/2020 Inventory of Develop an inventory of all 2.3.7.a.ii Municipal Facilities permittee-owned facilities. 6/30/2020 Operation and Develop a written set of O&M 2.3.7.a.i & Maintenance procedures for municipal 2.3.7.a.iii Procedures facilities, activities and MS4 infrastructure 6/30/2020 Stormwater Pollution Develop written SWPPPs for 2.3.7.b Prevention Plans municipal waste handling (SWPPP) facilities. 6/30/2020 Street Sweeping Sweep streets a minimum of 2.3.7.a.iii.3 once a year in the spring. Include miles cleaned or volume or mass of material removed in the annual report. 6/30/2020 Catch Basin Cleaning Develop and implement a catch Optimization basin cleaning schedule with a goal of ensuring no catch basin is 2.3.7.a.iii.2 more than 50 % full. Document catch basins inspected and cleaned, including total mass removed and proper disposal. 6/30/2020 Stormwater BMP Inspect all stormwater treatment Inspection & structures (BMPs) at least Maintenance annually and conduct 2.3.7.a.iii.6 maintenance as necessary. Track number of structures maintained and inspected annually. 6/30/2020 Update Emergency Review and update Emergency N/A Management Plan Management Plan as appropriate 6/30/2020 Integrated Pest Exclude pesticide use on Town N/A Management Properties Program 6/30/2020 Employee Training - Continue to provide annual General Stormwater training to employees on Topics pollution prevention and good 2.3.7.b housekeeping practices. Provide training on SWPPPs developed for municipal waste handling facilities. Checklist for Year 3 MS4 Permit Requirements — Watertown, MA Completion Requirement Task Permit Section Completed? Due Date for Reference 6/30/2021 Stormwater Management Plan Update written SWMP 1.10 (SWMP) 6/30/2021 Charles River Perform Funding Assessment F.A.I Table F-1 Phosphorus TMDL to provide for implementation Item 1-2 of Phosphorus Control Plan 6/30/2021 Charles River Implement public education F.A.III.1.a.i.1 Pathogens TMDL initiatives 6/30/2021 Public Education Fulfill public education initiatives aimed at target 2.3.2 audiences as outlined in the Town's NOI and this SWMP 6/30/2021 Public Participation Fulfill public participation initiatives aimed at target 2.3.3 audiences as outlined in the Town's NOI and this SWMP 6/30/2021 Update Drainage Update town -wide drainage 2.3.4.5 Map mapping as needed to include MS4 infrastructure. 6/30/2021 IDDE Continue to prohibit illicit Ordinance/Bylaw discharges as outlined in the 2.3.4.a Town's Illicit Discharge Ordinance, and take enforcement actions as needed. 6/30/2021 IDDE Employee Continue to train municipal Training employees on illicit discharge 2.3.4.11 detection and monitoring. 6/30/2021 Dry Weather Outfall Sample all outfalls and 2.3.4.7.b Screening and interconnections (excluding Sampling problem outfalls and excluded outfalls) for dry weather flow and sample flow if present. 6/30/2021 Update Catchment Update catchment ranking and 2.3.4.7.b.iii.c.iii Ranking prioritization based on dry weather outfall sampling data. 6/30/2025 Continue IDDE Continue investigation of 2.3.4.8.a Investigation of problem catchments Problem Catchments 6/30/2028 Begin IDDE Begin investigation of high and 2.3.4.8.a Investigation of High low priority catchments and Low Priority Catchments 6/30/2021 Street Sweeping Sweep streets a minimum of 2.3.7.a.iii.3 once a year in the spring. Include miles cleaned or volume or mass of material removed in the annual report. 6/30/2021 Catch Basin Cleaning Clean catch basins annually to 2.3.7.a.iii.3 ensure the no catch basin is more than 50% full. Report catch basins cleaned and volume of material removed annually. 6/30/2021 Stormwater BMP Inspect all stormwater Inspection & treatment structures (BMPs) at Maintenance least annually and conduct 2.3.7.a.iii.6 maintenance as necessary. Track number of structures maintained and inspected annually. 6/30/2021 Update Emergency Review and update Emergency N/A Management Plan Management Plan as appropriate 6/30/2021 Integrated Pest Exclude pesticide use on Town N/A Management Properties Program 6/30/2021 Employee Training - Continue to provide annual General Stormwater training to employees on Topics pollution prevention and good 2.3.7.b housekeeping practices. Provide training on SWPPPs developed for municipal waste handling facilities. Checklist for Year 4 MS4 Permit Requirements — Watertown, MA Completion Permit Requirement Task Section for Completed? Due Date Reference Stormwater 6/30/2022 Management Plan Update written SWMP 1.10 (SWMP) 6/30/2022 Charles River Define scope of Phosphorus F.A.I Table Phosphorus TMDL Control Plan F-1 Item 1-3 6/30/2022 Charles River Implement public education F.A.111.1.a.i.1 Pathogens TMDL initiatives 6/30/2022 Public Education Fulfill public education initiatives aimed at target audiences as 2.3.2 outlined in the Town's NOI and this SWMP 6/30/2022 Public Participation Fulfill public participation initiatives aimed at target 2.3.3 audiences as outlined in the Town's NOI and this SWMP 6/30/2022 Update Drainage Map Update town -wide drainage 2.3.4.5 mapping as needed to include MS4 infrastructure. 6/30/2022 IDDE Continue to prohibit illicit Ordinance/Bylaw discharges as outlined in the 2.3.4.a Town's Illicit Discharge Ordinance, and take enforcement actions as needed. 6/30/2022 IDDE Employee Continue to train municipal Training employees on illicit discharge 2.3.4.11 detection and monitoring. 6/30/2025 Continue IDDE Continue investigation of 2.3.4.8.a Investigation of problem catchments Problem Catchments 6/30/2028 Continue IDDE Continue investigation of high 2.3.4.8.a Investigation of High and low priority catchments and Low Priority Catchments 6/30/2028 Begin Wet Weather Begin sampling outfalls and 2.3.4.8.c Outfall Screening and interconnections with System Sampling Vulnerability Factors during wet weather 6/30/2022 Street Design and Develop a report assessing 2.3.6.b Parking Lot Guidelines requirements that affect the creation of impervious cover to determine if design standards for streets and parking lots can be modified to support low impact design options. 6/30/2022 Green Infrastructure Develop a report assessing the 2.3.6.c Practices barriers and incentives for Green Infrastructure/LID techniques. 6/30/2022 BMP Retrofit Identify 5 permittee-owned 2.3.6.d Identification properties that could be retrofitted with stormwater BMPs. 6/30/2022 Street Sweeping Sweep streets a minimum of 2.3.7.a.iii.3 once a year in the spring. Include miles cleaned or volume or mass of material removed in the annual report. 6/30/2022 Catch Basin Cleaning Clean catch basins annually to 2.3.7.a.iii.3 ensure the no catch basin is more than 50%full. Report catch basins cleaned and volume of material removed annually. 6/30/2022 Stormwater BMP Inspect all stormwater treatment Inspection & structures (BMPs) at least Maintenance annually and conduct 2.3.7.a.iii.6 maintenance as necessary. Track number of structures maintained and inspected annually. 6/30/2022 Update Emergency Review and update Emergency N/A Management Plan Management Plan as appropriate 6/30/2022 Integrated Pest Exclude pesticide use on Town N/A Management Properties Program 6/30/2022 Employee Training - Continue to provide annual General Stormwater training to employees on Topics pollution prevention and good 2.3.7.b housekeeping practices. Provide training on SWPPPs developed for municipal waste handling facilities. Checklist for Year 5 MS4 Permit Requirements — Watertown, MA Completion Permit Requirement Task Section for Completed? Due Date Reference Stormwater 6/30/2023 Management Plan Update written SWMP 1.10 (SWMP) 6/30/2023 Charles River Define written Phase I of F.A.I Table Phosphorus TMDL Phosphorus Control Plan F-1 Items 1- including Structural and Non- 4 through Structural Controls, O&M Plan, 1-8 Implementation Plan & Cost Estimate 6/30/2023 Charles River Implement public education F.A.Ill.1.a.i.1 Pathogens TMDL initiatives 6/30/2023 Public Education Fulfill public education initiatives aimed at target audiences as 2.3.2 outlined in the Town's NOI and this SWMP 6/30/2023 Public Participation Fulfill public participation initiatives aimed at target 2.3.3 audiences as outlined in the Town's NOI and this SWMP 6/30/2023 Update Drainage Map Update town -wide drainage 2.3.4.5 mapping as needed to include MS4 infrastructure. 6/30/2023 IDDE Continue to prohibit illicit Ordinance/Bylaw discharges as outlined in the 2.3.4.a Town's Illicit Discharge Ordinance, and take enforcement actions as needed. 6/30/2023 IDDE Employee Continue to train municipal Training employees on illicit discharge 2.3.4.11 detection and monitoring. 6/30/2025 Continue IDDE Continue investigation of 2.3.4.8.a Investigation of problem catchments Problem Catchments 6/30/2028 Continue IDDE Continue investigation of high 2.3.4.8.a Investigation of High and low priority catchments and Low Priority Catchments 6/30/2028 Continue Wet Begin sampling outfalls and 2.3.4.8.c Weather Outfall interconnections with System Screening and Vulnerability Factors during wet Sampling weather 6/30/2023 Street Sweeping Sweep streets a minimum of 2.3.7.a.iii.3 once a year in the spring. Include miles cleaned or volume or mass of material removed in the annual report. 6/30/2023 Catch Basin Cleaning Clean catch basins annually to 2.3.7.a.iii.3 ensure the no catch basin is more than 50% full. Report catch basins cleaned and volume of material removed annually. 6/30/2023 Stormwater BMP Inspect all stormwater treatment Inspection & structures (BMPs) at least Maintenance annually and conduct 2.3.7.a.iii.6 maintenance as necessary. Track number of structures maintained and inspected annually. 6/30/2023 Update Emergency Review and update Emergency N/A Management Plan Management Plan as appropriate 6/30/2023 Integrated Pest Exclude pesticide use on Town N/A Management Properties Program 6/30/2023 Employee Training - Continue to provide annual General Stormwater training to employees on Topics pollution prevention and good 2.3.7.b housekeeping practices. Provide training on SWPPPs developed for municipal waste handling facilities. APPENDIX G Public Education Materials .................................................................................................................................................................. westonandsampson.com Weston ® Sampson Town of Watertown 2019 Rain Barrel Program Did you know that using a rain barrel to collect precious rainwater not only conserves energy and you may even save money on your next water bill? Watertown DPW has partnered with The Great American Rain Barrel Company to provide rain barrels at a discount to its residents. They are heavy duty and come with a choice of two ports to use with either a watering can or a garden hose. Each barrel holds 60 gallons of rain water. As a Watertown resident, you are eligible to purchase rain barrels at the discounted rate of $65 and optional flow diverter at $16. The retail price is $119! Some Facts about Thn ilrnnt Amer'i-nn Quin Barrel • 100% re -purposed rain barrels produced in Massachusetts. • Most durable and reliable Rain Barrels on the market: 3/16" wall thickness. • Lasts for years when properly drained & stored for winter. • Screen filter to keep mosquitoes out. • Several rain barrels can be linked together — easy 5-minute setup Order and pickup year-round at: Watertown DPW 124 Orchard Street 617-972-6420 * Cash or check only 7 Watertown nf PrrbliGor'ks We're all a4aur ti+is raven' The Great American Rain Barrel Co rrtpany TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS (P) 617-972-6420 124 ORCHARD STREET (F) 617-972-6402 WATERTOWN MA 02472 Gerald S. Mee Jr. Superintendent FOR IMMEDIATE RELEASE Contact: Matthew I. Shuman, P.E. April 17, 2019 Town Engineer DPW has partnered with the Great American Rain Barrel Company in Hyde Park, MA to offer recycled rain barrels at a discounted price to residents as part of its water conservation and stormwater management programs. "We are thrilled to be offering this simple and inexpensive device to our residents to bring down their water costs and help us protect the Charles River," says Matthew Shuman, P.E., Watertown Town Engineer. "Like the recycling bin, we hope rain barrels become a standard in each and every home." In New England residential water usage can increase as much as 60% during the spring, summer and fall seasons from outdoor watering needs such as watering gardens, lawns, filling pools and, washing cars. Rain barrels can offset that usage, saving homeowner's money and helping the community manage water supplies. Also, stormwater from the Town's drainage system flows directly to the Charles River without treatment and is one of many contributors to pollution in the river. Rain barrels can help reduce stormwater runoff. Suzanne Gebelein, owner of the Great American Rain Barrel Company comments, "We have been selling barrels for 20 years and we are seeing a very positive trend. More and more communities nationwide, like Watertown, are bringing large scale programs to their towns, encouraging more residents to conserve water but also helping their town mitigate stormwater pollution on a larger scale." Homeowners can easily connect the barrels to their downspouts and significantly offset their watering needs. In this region there is typically 16" of rain from May 1st — September 30th. For every inch of rainfall a 1,000 square foot surface can collect 620 gallons of water, which means that over the course of the extended summer months an average roof of 2,400 square feet could see more than 20,000 gallons of fresh rainwater passing over its surface from May through September. That is a pretty significant source of water that homeowners could be tapping into for free. Just keeping a small 10' x 10' garden irrigated during the summer months can mean using up to 1,700 gallons of water. Based on the average roof size, more than two 60 gallon rain barrels would fill for every 1/10" of rainfall. The Great American Rain Barrel Company recommends one barrel for every 100 square feet garden. NNMESWain BarreA2019 Watertown Rain Barrel Press Release - Copy.doc Rain barrels can be purchased directly at the DPW year-round at a cost of $65 versus the retail price of $119. An optional flow diverter is also available for $16. Each barrel holds 60 gallons of rain water. To take advantage of this community program discount please contact DPW at 617-972-6420. For additional information about DPW, please refer to the DPW web -site, at www.watertowndpw.org. IMMESWain BarreA2019 Watertown Rain Barrel Press Release - Copy.doc BEST MANAGEMENT PRACTICES Snow & Ice Removal: Use mechanical means before applying deicers. Deicer Application: Follow manufacturer's instructions and use only enough to break the ice/pavement bond. Do not apply on vegetation or near waterways. Use less harmful deicers such as Calcium Magnesium Acetate or Sodium/Potassium Acetate. Snow & Ice Disposal: Do not dispose of snow & ice in wetlands or catch basins or directly on top of storm drains or ditches. FOR MORE INFORMATION For more information about ways to prevent stormwater pollution, please visit the Town's website: http://www.watertowndpw.org/161/Stormw ater-Management This brochure made in collaboration with Mystic River WATERSHED ASSOCIATION www.mysticriver.org Brochure adapted from Port Jefferson's Storm water Management Program Town of Watertown Snow and Ice Removal Requirements Businesses are required by law to clear their sidewalks within 2 hours of the end of a storm, or by the beginning of the next business day (see zoning language below). Businesses are subject to a fine of $100 for the first offense, $200 for the second offense, and $300 for the third offense. "SNOW/ICE REMOVAL ORDINANCE -- Every person in charge or control of any building or lot of land within a business district and used for business purposes in the City, fronting on or abutting a paved sidewalk, shall remove and clear away, snow and ice from a patch of at least 36-inches in width from that portion of the sidewalk, which abuts any side of the building or lot of land. Such snow and/or ice shall be removed within 2-hours after the cessation of any fall of snow, sleet, or freezing rain during business hours or by the beginning of business hours of the next business day following such fall." The Town also requests that residents clear their sidewalks, to allow neighbors to safely move around town. This includes the many children who use our sidewalks to get to school. For more information about the requirements, contact the Zoning/Code Enforcement Office at 617-972-6427. WINTER MAINTENANCE AND DE-ICING Proper Use of Deicers for Property & Business Owners WatertownTF /"a ntor We're all about ... this town."' OVERVIEW Snow and ice on roads, parking lots, driveways, and sidewalks can create hazardous conditions. Snow and ice removal is best done non -chemically with plows and shovels but, admittedly, the results are not always adequate to ensure safety. Chemical ice melters and/or sanding is often part of a comprehensive strategy to make winter's passage a safe one. IMPACTS OF SALT & SAND Salt and sand have traditionally been perceived as the cheapest and most effective materials for de-icing driving and walking surfaces. However, many people do not realize that they have hidden impacts that can detract from their overall effectiveness. Even in small quantities, salt can: - Deplete the oxygen supply needed by aquatic animals and plants; - Leach into the ground and change soil composition, making it hard for plants to survive; - Contaminate groundwater and surface waters; and, - Deteriorate paved surfaces, buildings, infrastructures, and the environment. Similarly, sand can: - Bury the aquatic floor life, fill in habitats, and cloud the water; - Cause premature deterioration of floor surfaces as it is tracked into buildings; Lose its effectiveness after becoming embedded in snow and ice; - Enter catch basins, storm drains, and surface waters if it is not swept up each spring; and, - Contribute to clogged storm drains, which can cause flooding. HOW DEICERS WORK Generally, chemical ice melters depress the freezing point of snow and ice and turn the mixture into a liquid or semi -liquid slush. Solid chemical salts bore through ice or snow and form a strong brine solution. This brine spreads under the ice or hard -packed snow and undercuts, breaking the bond to the surface. Once loose, the ice or snow is easily removed. PROPERTIES OF DEICERS Sodium Chloride: Also known as rock salt, it provides adequate, economical performance at temperatures at or just below 32F; though it loses most of its effectiveness when temperatures fall below 22F. It can be corrosive to steel, is harmful to roadside vegetation, and can contaminate surface water and drinking water. Calcium and Magnesium Chloride: Though they cost 2-3 times more than rock salt, they are effective at lower temperatures, less corrosive to metals, and less harmful to roadside vegetation. They leave a white residue on surfaces when dry. Potassium Chloride: Though it costs about 10 times more than rock salt, it is effective at lower temperatures, less corrosive to metals, and considered to be more environmentally - friendly than other salts because of its lower chloride content. Sodium or Potassium Acetate: Though they cost about 8 times more than rock salt, they are effective at lower temperatures, are not corrosive to metals since they contain no chlorides, and are safer for the environment. Calcium Magnesium Acetate: Though it cost about 5 times more than rock salt, it is effective at lower temperatures, it is not corrosive to metals, and is one of the most environmentally -friendly ice melting compounds. NOTES ABOUT SAND Sand is an abrasive that does not have any ice melting capacity. It can provide traction for walking or driving. It is typically mixed with a deicer to prevent its clumping. Sand is non -corrosive and inexpensive. However, sand will accumulate and will clog catch basins and stormwater systems. Sand can also create problems with dust when it dries. If you use sand on a commercial parking lot of driveway, make sure to have your parking lot swept and catch basins cleaned at the end of the season. 10 grow prolifically because they are `fertilized' by excess phosphorus in the Charles. Definitions Nutrient: a substance an organism needs to live, which must be obtained from its external environment. Stormwater runoff. rainwater that runs along impervious surfaces, collecting pollutants and then flowing into local waterways. Combined sewer overflow (CSO): overflow of raw, or partially treated, sewage combined with rainwater runoff flowing into a water body, usually during heavy rain. Cyanobacteria (blue-green algae): Photosynthetic bacte- ria that live and grow in aquatic environments. These or- ganisms can produce toxins which are harmful to humans and other mammals in high doses. These organisms can give the water a green paint -like appearance (as pictured on the front cover) when present in large numbers. Charles River Watershed Association 190 Park Road Weston, MA 02493 www.charlesriver.org 781-788-0007 This project is funded by the Massachusetts Environmental Trust. References and Additional Resources Cyanobacteria advisory sign courtesy of Massachusetts Depart- ment of Conservation and Recreation, http://www.mass.gov/dcr/. Final Total Maximum Daily Load for Nutrients in the Lower Charles River Basin, Massachusetts. MassDEP and US EPA, June 2007. Massachusetts Department of Public Health (MDPH) Guidelines for cyanobacteria in freshwater recreational water bodies in Massachu setts. Nonpoint Pollution of Surface Waters with Phosphorus and Nitro- gen. In Issues in Ecology, Summer 1998. http://www.epa.gov/watertrain/pdf/issue3.pdf. Organization for the Assabet River. http://www.assabetriver.org/ take-action/prevent-pollution/detergents. Streamflow, Water Quality, and Contaminant Loads in the Lower Charles River Watershed, Massachusetts, 1999-2000. USGS Water - Resources Investigations Report 02-4137. Occurrence of Cyanobacterial Toxins (Microcystins) in Surface Waters of Rural Bangladesh: Pilot Study Report, May 2004. World Health Organization. http://www.who.int/water_sanitation_health/ emergi ng/wsh04O6. pdf. i� Printed on recycled paper with soy -based inks Phosphorus in the Charles River: What You Should Know! Information about the consequences of too much phosphorus entering the Charles. Charles River MASSALHUSETT Watershed Association NVIRONM RUST TRUS What is phosphorus? Phosphorus is a naturally -occurring element present in rock, soil, and organic matter. Plants require phosphorus during photosynthesis. Aquatic plants obtain this nutrient from the water around them. Where does phosphorus come from? How does it get into the Charles River? Phosphorus naturally enters rivers and other water bodies through erosion of rocks and soils and decomposition of organic matter. Today, human activities add a large amount of extra phosphorus to the Charles River. High phosphorus levels are causing problems for the human and wildlife populations that depend on the Charles. Phosphorus is carried by stormwater runoff from fertilizers, sediment, automobile exhaust and animal waste. Phosphorus also enters our waterways through wastewater treatment facility discharge and combined sewer overflows (CSOs). Due to human activities and natural abundance, phosphorus is ubiquitous in the environment. The larger the volume of ad of phosphorus it will carry with it. Phosphorus is everywhere in the environment. The larger the volume of stormwater runoff that enters the Charles River, the larger the load of phosphorus it will carry. phosphorus in theCnarieS rver. Phosphorus is not toxic to humans or animals, yet excess levels in a water body can have adverse health effects for YOU, your children, and your pets. Phosphorus feeds toxin - producing photosynthetic cyanobacteria, also known as blue-green algae. (See photo on front cover.) Too much phosphorus allows these organ- isms to flourish and produce 1 CA UT I M toxins which can be harmful to _ humans and animals through - --• �"� """ exposure by skin contact or in- gestion. When cyanobacteria�,, presents a potential danger in ^ the Charles, CRWA works with w...�.�-H r..�.�... state agencies and other organi- zations to post advisory signs to notify the public (at right). ��-=�-=-- ••• Annual Phosphorus Inputs by Source to the Lower Charles River Basin C50 Industrial 6% 14% Commercial 9% Residential Wastewater 40% Treatment Facilities 17% Other 11% Agriculture 3% What are the ec much phosphorus in the Charles River? Adding phosphorus to a river or lake essentially fertilizes the aquatic system. As phosphorus is typically the nutrient limiting plant growth in fresh water systems, the addition of phosphorus allows more plants to grow. Algae, photosynthetic cyanobacteria and aquatic weeds can grow in abundance, altering the natural balance of the aquatic ecosystem. What can I do to prevent excess phosphorus from entering the Charles River? There are many things you can do to reduce the amount of phosphorus that enters our local environment and reduce overall stormwater runoff volume to the Charles: • Test your soil to determine if it requires additional fertilizers; many local soils do not. • If your soil requires additional nutrients, use compost instead of store-bought fertilizer or choose "slow -release" organic fertilizer. • Walk, bike or take the T to nearby destinations. • Do not feed wild animals, especially geese 11111111 ducks. • Reduce and/or treat stormwater runoff f= your own property as much as possible. ConM planting a rain garden or green roof, using ram barrels or dry wells and replacing impervious areas, such as driveways and patios, with permeable pavers or porous pavement. • Visit a car wash, where water is treated anq recycled, instead of washing your car in your driveway. • Perform regular maintenance on your septil system to prevent backups. • Reduce areas of exposed soil on your prop= this is especially important during renovation • Do not dispose of grass clippings in rivers, streams, or on their banks. • Pickup aft posh the waste in t mpoM 0, Opp, rorl Kle ore I K/ N I Licensing Your Dog You may obtain, in person or by mail, a Dog License from the Watertown Town Clerk's Office, at the Town Hall, 149 Main Street. The Town Clerk's office provides dog licenses on Monday, Wednesday, Thursday, Friday 8:30 AM-5:00 PM, and Tuesday 8:30 AM-7:00 PM. Along with the application you must provide the dog's current rabies vaccine certificate, and evidence that the dog has been spayed or neutered, if applicable. To access the Dog License Application, visit the Town of Watertown's website at: www. watertown-ma.gov • Click on Document Center in the upper right hand corner of the web page. • Click on Town Clerk and Elections folder. • Click on the Dog or Cat License Application link on the right. The license fees per dog are $10.00, $5.00 for owners 60+, or $35.00 if the dog is not spayed or neutered. Watertown Dog Park Rules Currently there are two Off -Leash Dog Parks available to Watertown residents: • How Park, Pleasant Street & Bacon Street • Alta at the Estate, 100 Woodview Lane" The use of the Watertown Dog Park owned by Watertown is restricted to Watertown residents. The Watertown owned Dog Park is subject to the following rules, which are needed for the safe and lawful enjoyment of Watertown's open space by everyone: • Dogs must display current WATERTOWN DOG LICENSE at all times. • Dogs must be leashed when entering and exiting the fenced area. • Adhere to posted park hours. • Dogs must never be left unattended. • Owners must pick up and dispose of all dog waste immediately. • Each person is limited to 3 dogs. • No food or smoking allowed in the park. • Park use is at your own risk. The Town of Watertown is not responsible for injury or damage arising from use of the park. • Violators of these rules are subject to removal from the area and/or fines. Fines start at $25.00-$50.00 and increase for subsequent offenses. "Alta at the Estate is privately owned and has established its own park rules. The above rules are not applicable to this park. For all Watertown owned Dog Park maintenance issues contact: parksrecgwatertown-ma.gov Dog Walking Rules and Etiquette RESTRAINT: All dogs must be leashed and controlled, no matter how friendly or obedient the dog is. This law is especially important in our dense community. Leash laws protect our dogs and the public at large from harm. CURB YOUR DOG: Unless permission is specifically granted by a property owner, keep your dog off private property. This includes front lawns! PICK UP THE POOP! For health and sanitary reasons, always remove dog waste immediately. Please dispose of dog waste bags in your OWN garbage. NEVER place dog waste in a storm drain. This water is not sent to a treatment facility and is released directly into our waterways. Lai■ now ■ ■7r■ ■11■. DOGS MUST BE ON LEASH AND UNDER CONTROL AT ALL TIP.9E S OWNER MU ST REPROVE DOG WASTE IMMEDIATELY For current dog park locations please visit www.watertown-ma.gov Animal Control Please be advised of the following state laws and municipal ordinances relating to dogs: The Watertown Animal Control Officer is part of the Town of Watertown's Health Department. The Animal Control Officer was established under Massachusetts General Law (M.G.L.), Chapter 140, Sections 136-174. The Animal Control Officer is responsible for: ■ Responding to all calls about sick, injured or dangerous animals. ■ Enforcing ordinances regarding animals including cruelty to animals, abandoned or loose animals and animals in Town parks. Quarantining animals that have bitten or been bitten, filing mandated bite reports and following through with any necessary prosecution. Contact: Karen O'Reilly Animal Control Officer/Animal Inspector Watertown Administration Building Health Department 149 Main Street Watertown, MA 02472 koreilly(a)watertown-ma. gov 617-972-6446 For emergencies only please call the Watertown Police Department at 617-972-6500 ■ All dogs must be licensed by the Town Clerk's Office, and licenses must be renewed each year in January (M.G.L. Ch. 140, Sec. 137). ■ All dogs must be vaccinated against rabies (M.G.L. Ch. 140, Sec. 145B). ■ All dogs must be leashed at all times while on a public way (Watertown Animal Control Ordinance 91.16). ■ No dogs are allowed on school property (Watertown Animal Control Ordinance 91.16) or in cemeteries maintained by the Town of Watertown. ■ No dogs are allowed in Town parks except those designated for dog use (Watertown Animal Control Ordinance 91.16). ■ All dog owners must pick up after their dogs and dispose of waste properly at all times (Watertown Animal Control Ordinance 91.17). ■ No pet waste may be disposed of in storm drains (Watertown Stormwater Ordinance 97.07). ■ All dog owners must follow all dog park rules which are subject to change. Each offense is subject to a fine of $25. 00- $50. 00. Fines increase with subsequent offenses. RESPONSIBLE DOG OWNERSHIP IN WATERTOWN 1630 Watertown Animal Control P Health Department Administration Building 149 Main Street 617-972-6446 WATERTOWN RAIN DRAIN PAIN Where does the rain go? Have you ever wondered where all the water goes when it rains or after the snow melts? Some of it seeps into the ground or evaporates, but most of it runs off over the land and into our catch basins and storm drains. Nearly all Watertown's storm drains empty into the Charles River. Not to a treatment plant. The runoff water from rain and snow is called "stormwater." Stormwater can pick up litter, leaves, sand, bacteria, oil and other chemicals as it flows over the land, washing these pollutants into our streams, ponds, river, and wetlands. WHEN IT RAINS IT DRAINS What you do in your yard or on your property affects the health of our neighborhoods and everyone downstream. We all need clean water for drinking and for protecting wildlife. And we all want clean water for swimming, fishing, and boating. Flip this — the other side shows how to prevent rain drain pain. Department of Public Works 617-972-6420 Watertown DPW.org Stormwater Advisory Committee WatertownStormwater.org FLIP Illicit Discharges — What A Pain! Anything put into the drainage system that is not 100% stormwater is an illicit discharge. Examples: • car wash wastewater • gas and motor oil on8 W@ • kitchen grease/oil • household cleaners • paints Please Don't Mix[ • pesticides • solventsroil • vehicle spills• weed killers p � • pet waste 7.7911-1 These pollutants in the drains cause serious health and water quality problems. NEVER put ANYTHING down a storm drain! Add to the solution, not to the pollution. Leaves don't I! MAY � W6 F belong in the stormdrain , ..Hu# Ids sEll Ik6er. More ways you can help: • Recycle motor oil, antifreeze, tires & batteries. • Use a commercial car wash or wash your car on the lawn so water can seep into the soil. • Cover soil piles with tarps; replant bare areas. • Go easy on fertilizer, pesticides and herbicides. • Clean up spills immediately — use kitty litter or sawdust to absorb the spill, then sweep up and dispose in your trash. • Don't block storm drains with refuse or debris. • Remove debris from stormdrain grates near your home. • Pick up after your pet and dispose of droppings in the trash. • And please, don't let your leaves and grass clippings wash into the drains. Town of Watertown Summer 2018 Newsletter Issued by Michael J. Driscoll, Town Manager Watertown Town Council Mark S. Sideris, President Vincent J. Piccirilli, Vice President Caroline Bays, At -Large Anthony J. Donato, At -Large Susan G. Falkoff, At -Large Anthony Paloma, At- Large Angeline B. Kounelis, District A Lisa J. Feltner, District B Kenneth M. Woodland, District D Town of Watertown, Massachusetts 149 Main Street Watertown, Massachusetts 02472 www.watertown-ma.gov Changes Planned for Mt. Auburn Street Mt. Auburn Street is undergoing a major re -design that will improve facilities for pedestrians and bicyclists while maintaining vehicle mobility. Special attention is going to the Coolidge Square area to improve the environment for shoppers, transit riders and other people who frequent the Square. Design and engineering are currently underway with construction anticipated in 2022 based on availability of state funding. To learn more and become involved, visit hiips://mountaubumstreet.com. In the more immediate future, small changes are planned to improve bus travel time and reliability, known as the Bus Priority Pilot, in both Watertown and Cambridge. A dedicated bus and bike lane will appear between Cottage Street and Fresh Pond Parkway, so that buses will no longer pull in and out of traffic. At Walnut Street and School Street, a new combined Right -Turn and Queue Jump Lane will help buses and right -turning vehicles get through the intersections faster. This project is anticipated for Fall 2018. For more information go to www.cambridgema.gov/mtaubumbuspriority. Bike Sharing Comes to Watertown You may notice bright green or orange free-standing bikes in and around Watertown. These are part of a new program called "Bike Sharing", which allows short-term, one-way bike rental. Watertown is working with a group of 16 communities surrounding Boston to bring this service to its residents. The bikes are self-locking, and are accessed through a smart phone app. Rides cost $1.00 for the first half hour. This service is expected to reduce congestion by replacing some short car rides in and around Watertown and the surrounding communities. For more information, contact Senior Transportation Planner Laura Wiener at lwienergwatertown-ma.gov. Tax Break for Owner -Occupied Homes (Residential Exemption) Historically, the Watertown Town Council has voted each year to exempt a fixed amount of the assessment of every owner -occupied residential property. Applications are in the mail for all new home owners that purchased their property during calendar year 2017 and to anyone that doesn't already have it in place who appears to qualify. Please fill out the application upon receipt. The Council votes on the amount in the fall and the exemption is applied to the Jan 1, 2019 bill for Fiscal Year 2019 (July 1, 2018 — June 30, 2019). Please call the Assessors' Office with any questions 617.972.6410. Senior Property Tax Work Off Program This program allows for up to ten Watertown homeowners (age 60 and older) a $1,500 deduction from their property tax bill in exchange for 136 hours of work for a Town department from July 1, 2018 until March 31, 2019. Participants should be retired and must own and occupy the property for which the taxes are deducted. In addition, the applicant's skills must match those needed by the participating Town departments. Past participants have worked in the Library, Recreation, School, or Public Health Departments, and at the Senior Center. Preference is given to applicants whose annual income is 300% of the 2018 Federal Poverty level or less ($36,420 for single, $49,380 for married couple), and then other applicants will be considered. Call the Senior Center at (617) 972-6490 for an application. Department of Public Works Plastic bags are not accepted in the recycling toter. Please do not place recyclables in a plastic bag! Yard waste collection now on your trash day the weeks of: 6/25-6/29, 7/9-7/13, 7/23-7/27, 8/6-8/10, 8/20-8/24, 9/17-9/21, 1011-1015, 10/15-10/19, 10/29-11/2, 11-5-11/9, 11/26-11/30, 12/10-12/14 Protect the Charles River! What you do in your yard or on your property affects our river's health. The Town's storm drains send rainwater and pollutants directly into the Charles River; they don't go to a treatment plant. Therefore, never put anything down a catch basin or storm drain -- especially oils, chemicals, pet waste, trash, or leaves. To learn more about how you can help protect the River and how the Town manages its stormwater, visit http://www.watertowndpw.org and click on our "Stormwater Management" page. Office of the Town Manager • 149 Main Street Watertown, MA 02472 •617-972-6465 # watertown-ma.,ov How Will You Find Out About Local Emergencies? Sign up for the Watertown emergency notification system. Go Online to — http://www.ci.watertown.ma.us/ and click on the Emergency Watertown Alert button to sign up. Overgrown Vegetation The Town's Vegetation Overgrowth Ordinance creates a safe and attractive neighborhood to live and play. Please maintain your property to prevent blight and hazardous conditions by ensuring that: 1. Vegetation does not intrude into public sidewalks by more than 6-inches, except at a height of 8-feet or above the public sidewalk (i.e., tree limbs); 2. A clear view/sightline is maintained at intersections, and adjacent to driveways, by keeping vegetation, hedges, fences, etc. below 3- feet; 3. Any parcel of land, vacant or otherwise, is maintained so that such parcel of land is free from overgrown vegetation and standing water. Watertown Free Public Library Need a new summer hobby? Discover Hatch Makerspace, a Watertown Free Public Library initiative. Laser cutting, 3D printing, sewing, robotics: make what you dream. Take a workshop or just drop in, it's always free. Learn more at watertownlib.org/hatch If you or a loved one is visually impaired, and would like to learn more about where to find and how to use assistive technology, please sign up for a free one-on-one session with a VIBRANT trainer. VIBRANT = Visually Impaired Blind Recipients Accessing New Technology. One -hour private sessions will be available July 23 and August 20, from 1-5 p.m. at the library. Registration is required at the library, over the phone or online, and will begin 3 weeks before the session. Take it from your librarians: the source of your news really does matter! Get past the paywall with the library's online subscription to NYTimes.com - see watertownlib.org/nytimes for details. Did you know the library offers computer and technology classes for free? Learning a new skill could lead you to a bright new career. Registration is required at the library, over the phone or online, and will begin 3 weeks before each class. Here are some upcoming classes! Monday 7/23 and 7/30: Introduction to Programming, Using Python Saturday 9/8: Intro to Computers for Absolute Beginners Tuesday 9/11: Intro to the Internet Wednesday 9/12: Intro to Social Media Free Summer Concert Series The Town of Watertown is proud to bring another year of spectacular talent to Saltonstall Park. Every Thursday for 8 weeks starting June 28th through August 16'b. 6:30pm to 8pm. Snow cones, popcorn and water will be served free of charge courtesy of Watertown Savings Bank, Belmont Savings Bank and Stop & Shop. For this year's line-up, please visit: httn://www. ci.watertown.ma.us/DocumentCenterNiew/25182/2018-Summer-Concerts-Flver. Family Movie Nights When: Friday, July 20th and Friday, Aug 10 b. Where: The park at 552 Main Street, behind the Police Station. Time: 6:30pm-10:00pm Bring your family out for a night of fun and excitement! From 6:30-8:00pm there will be games, face painting, popcorn, pizza, and refreshments. The movie will begin at 8:00pm! Hosted by the Watertown Police & Recreation Departments. Administration Building and Senior Center Summer Hours through Tuesday, September 4. The Administration Building and Senior Center Summer hours of operation on Mondays, Wednesdays and Thursdays are 8:30am to 5pm; Tuesdays from 8:30am to 7pm and Fridays from 8:30am to 2pm. The Building Inspectors' Office is open at 7:30am until 5pm or 7pm, when all offices in the Administration Building are open. Payments after business hours may be placed in the drop-off box located on Thaxter Street (between Library and Administration Building). Boards, Commissions and Committees By serving on a Town Board/Commission/Committee you'll make a valuable contribution to the community of Watertown and meet other residents who share similar interests. Even if you cannot serve on a committee all Watertown residents are welcome to attend any of the many committee meetings held. Interested applicants should submit a letter of interest accompanied by a resume by email to townmgr@watertown-ma.gov or Town Manager's Office, 149 Main Street. You can view upcoming meetings and events on the Town's website. www.watertown-ma.gov. Office of the Town Manager • 149 Main Street Watertown, MA 02472 •617-972-6465 # watertown-ma.gov Town of Watertown Winter 2018 Newsletter Issued by Michael J. Driscoll, Town Manager Watertown Town Council Mark S. Sideris, President Vincent J. Piccirilli, Vice President Caroline Bays, At -Large Anthony J. Donato, At -Large Susan G. Falkoff, At -Large Anthony Paloma, At- Large Angeline B. Kounelis, District A Lisa J. Feltner, District B Kenneth M. Woodland, District D Town of Watertown, Massachusetts 149 Main Street Watertown, Massachusetts 02472 www.watertown-ma.gov Overnight Parking Ban Watertown Chief of Police Michael P. Lawn has announced the 2018-2019 Winter Parking Ban dates. Effective November 26, 2018 and continuing to April 1, 2019 the Winter Parking Ban will be in effect and strictly enforced. The regulation reads in part; "No vehicle may remain on any public way for more than one hour between the hours of lAM and 6AM all days of the week". For residents who lack sufficient off-street parking, the Town allows for temporary parking at any municipal parking lot and other locations noted: • The police station at 552 Main Street (visitor's parking lot only) • Any public school parking lot • Marion Road parking lot at Victory Field • O'Connell Park, (lot at the corner of Boylston Street and Mt Auburn Street) Please note that these locations may be used free of charge, however vehicles may only use available spaces after 7PM and must be moved/removed by 7AM the following day. Vehicles must be removed from school property no later than 6AM. Violators may be towed. Please remember that parking your vehicle upon any sidewalk is prohibited. Your cooperation in keeping the streets clear of overnight parking and your sidewalks clear of snow and ice will make for safer driving and walking conditions and at the same time, allow the opportunity for the Public Works Department to perform necessary street cleaning and maintenance. Snow and Ice Removal Clearing the snow and ice from your sidewalk helps keep Watertown accessible for all pedestrians, all winter long. Businesses are required by law to clear their sidewalks within 2 hours of the end of a storm, or by the beginning of the next business day (see zoning language below). Businesses are subject to a fine of $100 for the first offense, $200 for the second offense, and $300 for the third offense. The Town also requests that residents clear their sidewalks, to allow neighbors to safely move around town. This includes the many children who use our sidewalks to get to school. "SNOW/ICE REMOVAL ORDINANCE -- Every person in charge or control of any building or lot of land within a business district and used for business purposes in the City, fronting on or abutting a paved sidewalk, shall remove and clear away, snow and ice from a patch of at least 36-inches in width from that portion of the sidewalk, which abuts any side of the building or lot of land. Such snow and/or ice shall be removed within 2-hours after the cessation of any fall of snow, sleet, or freezing rain during business hours or by the beginning of business hours of the next business day following such fall. " For more information about the requirements, contact Michael Mena, Zoning Enforcement Officer, at mmenakwatertown- ma. gov. Office of the Town Manager • 149 Main Street Watertown, MA 02472 •617-972-6465 # watertown-ma. pov Parking Study Underway for Watertown Square and Coolidge Square Most people would agree that our parking meters are outdated and could use an upgrade. But aside from that, are there ways that we can use our parking supply to support healthy commercial centers? Can we better manage our parking, both on -street and in parking lots? Those questions will be answered as part of a new Parking Management Plan, now underway. The Project Team needs help from the public to fully understand current parking needs. There are two ways you can participate. One is to attend one of two public meetings where the Town's consultant, Stantec, will present data on current parking supply and use, and seek input on improving parking management. The second way is to take a survey, at www.watertownnarkinizsurvev.com. Public meetings will be open house style. Although there are 2 nights, one designated for each of the two commercial centers, you can come to either one to share your thoughts. The meetings are as follows: Wednesday January 23 (for Coolidge Square) and Thursday January 24 (for Watertown Square) from 5:00 PM to 8:00 PM at the Watertown Free Public Library (Watertown Savings Bank Room). There will be a future public meeting with presentation of findings and draft recommendations for public input. To learn more about the Parking Study, view the Parking Study webpage, at https://www.watertown-ma.gov/950/Parking, or contact Laura Wiener, Senior Transportation Planner, at lwiener(cbwatertown-ma.gov. LimeBike Bike -Sharing Goes into Winter Mode Dockless bike sharing was a popular way to travel through Watertown this summer and fall. More than 14,000 rides were taken, including on both manual and electric -assist bicycles. Over 5,000 riders rode a total distance of 14,150 miles since Watertown launched the program along with 15 neighboring communities. Now that winter is approaching, Lime has reduced its fleet and will be removing the bikes until spring. Adopt an Island Program The Town of Watertown's "Adopt an Island" program provides opportunities for companies, civic groups, institutions, and individuals to adopt a traffic island or other designated public spaces and create attractive, welcoming "oases" throughout the Town. For more information, please visit www.watertowndpw.org under news and announcements. Christmas Tree Collection Information Watertown Public Works collects Christmas trees curbside throughout the month of January. For collection, place your tree out at the curb on your normal trash day and remove all tinsel, lights, decorations, tree stands and plastic bags from Christmas trees. Please also ensure trees do not become stuck or frozen in snow banks. Protect the Charles River! What you do in your yard or on your property affects our river's health. The Town's storm drains send rainwater and pollutants directly into the Charles River; they don't go to a treatment plant. Therefore, never put anything down a catch basin or storm drain -- especially oils, chemicals, pet waste, trash, or leaves. To learn more about how you can help protect the River and how the Town manages its stormwater, visit www.watertowndpw.org and click on our "Stormwater Management" page. School Crossing Guards The Town of Watertown seeks to hire School Crossing Guards to assist school children crossing the streets, while providing for the orderly movement of traffic. Wage starts at $14.90 per hour. For more information see full ad on www.watertown-ma.gov or call 1-617-972-6443 at the Personnel Office for an application. Library Donate your used books to the Watertown Free Public Library! We know, it's painful to let go of those trusted friends, your books. You can rest easy when you send them our way -we'll put them to use. Books that make the cut will be put in the Red Leaf Caf6 book sale, which helps to fund library programs. Occasionally, books in excellent condition will be added to the library collection. To donate, bring your used books to the Circulation Desk. We hope you'll join us for the 7th annual Winter Concert Series at Watertown Free Public Library: JOSHUA PECKINS, classical violin recital and lecture on the music of J.S. Bach. Sunday, 1/6 12 PM WOMEN IN WORLD JAZZ, Music from around the world mixed with jazz favorites. Sunday, 2/3 1 2 PM THE KELLY GIRLS, Rousing songs rooted in the Celtic tradition. Sunday, 3/3 12 PM Office of the Town Manager • 149 Main Street Watertown, MA 02472 •617-972-6465 # watertown-ma.gov AT \ 9 . ■ Regulatory Mechanisms .................................................................................................................................................................. westonandsampson.com Weston ® Sampson r_ Watertown Town Council Administration Building 149 Main Street Watertown, MA 02472 Phone; 617-972-6470 ELECTED OFFICIALS: Mark S. Slderls, ORDINANCE # 23 0-2011-23 Council President Stephen P. Corbett, ADOPTION OF AN ORDINANCE REGARDING THE PROHIBITION OF Vice President ILLICIT DISCHARGES TO THE STORM DRAINAGE SYSTEM John A. Donohue, Councilor At Large Whereas, the purpose of this ordinance is to provide for the Susan G. Falkoff, health, safety, and general welfare of the citizens of Watertown through Councilor At Large the regulation of all discharges to the storm drainage system, and Anthony Palomba, Councilor Al Large Whereas, the National Pollutant Discharge Elimination System (NPDES) permit process requires adoption of an ordinance to prohibit Angeline B. Kounelis, District A Councilor illicit discharges into out stormwater system, and Cecilia Lank, Whereas, adoption of the ordinance regarding the prohibition of District B Councilor illicit discharges to the storm drainage system will help to protect the Vincent J. Piccirilli, Jr., Watertown municipal separate storm sewer system in accordance with the District C Councilor following objectives John J. Lawn, Jr., District D Councilor (1) To prevent the contribution of pollutants to the MS4 by stormwater discharges by any user (2) To prohibit Illicit Connections and Discharges to the municipal separate storm sewer system (3) To establish legal authority to carry out all inspection, surveillance, monitoring and enforcement procedures necessary to ensure compliance with this ordinance (4) To require the removal of all such illicit connections (6) To comply with state and federal statutes and regulations relating to stormwater discharges, and Whereas, several public meetings have been conducted to discuss the merits of adopting this ordinance, including meetings of the Stormwater Advisory Committee, and the Public Works Subcommittee of the Town Council, and Whereas, the Town Council of Watertown has conducted a public heating on these amendments on May 11, 2011, and NOW THEREFORE BE IT ORDAINED by the Town Council of the City known . as Town of Watertown that the Watertown Code of Ordinances, Chapter 97: Stormwater Regulations, is hereby amended by adding Sections 97.01 - 97.17 as follows: Prohibition ®f Illicit Discharges t® the Storm Drainage System. Watertown, Massachusetts 97.01 PURPOSE/INTENT The purpose of this ordinance is to provide for the health, safety, and general welfare of the citizens of Watertown through the regulation of all discharges to the storm drainage system. This ordinance establishes methods for controlling the introduction of pollutants into the municipal separate storm sewer system (MS4) in order to comply with requirements of the National Pollutant Discharge Elimination System (NPDES) permit process. The objectives of this ordinance are: (2) To prevent the contribution of pollutants to the M84 by stonnwater discharges by any user (2) To prohibit Illicit Connections and Discharges to the municipal separate storm sewer system (3) To establish legal authority to carry out all inspection, surveillance, monitoring and enforcement procedures necessary to ensure compliance with this ordinance (4) To require the removal of all such illicit connections (5) To comply with state and federal statutes and regulations relating to stormwater discharges, 97.02 DEFINITIONS For the purposes of this ordinance, the following shall mean:' Authorized Enforcement Agency The Watertown Department of Public Works and its employees and agents designated to enforce this ordinance. Best Management Practices (BMPs}: any measure that reduces the quantity or improves the quality of stormwater runoff including, but not limited to: schedules of activities, prohibitions of practices, general good house keeping practices, pollution prevention and educational practices, maintenance procedures, and other management practices to prevent or reduce the discharge of pollutants directly or indirectly to stormwater, receiving waters, or stormwater conveyance systems. BMPs also include treatment practices, operating procedures, and practices to control site runoff, spillage or leaks, sludge or water disposal, or drainage from raw materials storage. Clean Water Act. The federal Water Pollution Control Act (33 U.S.C. § 1251 et seq.), and any subsequent amendments thereto. Construction Activity. Activities subject to NPDES Construction Permits. These include construction projects resulting in land disturbance of 1 acre or more. Such activities include but are not limited to clearing and grubbing, grading, excavating, and demolition._ Hazardous Materials, Any material, including any substance, waste, or combination thereof, which because of its quantity, concentration, or physical, chemical, or infectious characteristics may cause, or significantly contribute to, a substantial present or potential hazard to human health, safety, property, or the environment when improperly treated, stored, transported, disposed of, or otherwise managed. Illicit Discharge. Any direct or indirect non-stormwater discharge to the storm drain system, except as exempted in Section 7 of this ordinance. Illicit Connections. An illicit connection is defined as either of the following: (1) Any drain or conveyance, whether on the surface or subsurface, which allows an illicit discharge to enter the storm drain system including, but not limited to any conveyances which allow any non-stormwater discharge including sewage, process wastewater, and wash water to enter the storm drain system and any connections to the storm drain system from indoor drains and sinks, regardless of whether said drain or connection had been previously allowed, permitted, or approved by an authorized enforcement agency before the effective date of this ordinance, (2) any drain or conveyance connected from a commercial or industrial land use to the storm drain system which has not been documented in plans, maps, or equivalent records and approved by an authorized enforcement agency. Industrial Activity. Activities subject to NPDES Industrial Permits as defined in 40 CFR, Section 122.26 (b) (14) . _National Pollutant Discharge Elimination System (NPDESi Stormwater Discharge Permit. A permit issued by EPA (or by a State under authority delegated pursuant to 33 USC § 1342(b)) that authorizes the discharge of pollutants to waters of the United States, whether the permit is applicable on an individual, group, or general area -wide basis. Non-Stormwater Discharge. Any discharge to the storm drain system that is not composed entirely of stormwater. Person : An individual, partnership, association, firm, company, trust, corporation, agency, authority, department or political subdivision of the Commonwealth or the federal government, to the extent permitted by law, and any officer, employee, or agent of such person. Pollutant, Any element or property of sewage, agricultural, industrial or commercial waste, runoff, leachate, heated effluent, or other matter, in whatever form and whether originating at a point or major non -point source, which is or may be discharged, drained or otherwise introduced into any sewerage system, treatment works, or waters of the Commonwealth, Pollution. The presence in the environment of pollutants in quantities or characteristics which are or may be injurious to human, plant or animal life or to property or which unreasonably interfere with the comfortable enjoyment of life and property throughout such areas as may be affected thereby. Premises. Any building, lot, parcel of land, or portion of land whether improved or unimproved including adjacent sidewalks and parking strips. _Municipal Separate Storm Sewer System (MS4) or Municipal Storm Drain System. Publicly -owned facilities by which stormwater is collected and/or conveyed, including but not limited to any roads with drainage systems, municipal streets, gutters, curbs, inlets, piped storm drains, pumping facilities, retention and detention basins, natural and human -made or altered drainage channels, reservoirs, and other drainage structures that together comprise the storm drainage system owned or operated by the Town of Watertown. Stormwater. Any surface flow, runoff, and drainage consisting entirely of water from any form of natural precipitation, and resulting from such precipitation. Stormwater Pollution Prevention Plan: A document which describes the Best Management Practices and activities to be implemented by a person to identify sources of pollution or contamination at a site and the actions to eliminate or reduce pollutant discharges to Stormwater, Stormwater Conveyance Systems, and/or Receiving Waters to the Maximum Extent Practicable. Wastewater means any water or other liquid, other than uncontaminated stormwater, discharged from a facility. Watercourse. A natural or man-made channel through which water flows or a stream of water, including a river, brook or underground stream. Waters of the Commonwealth. All waters within the jurisdiction of the Commonwealth, including, without limitation, rivers, streams, lakes, ponds, springs, impoundments, estuaries, wetlands, coastal waters, and groundwater. 97.03 APPLICABILITY This ordinance shall apply to flows entering the municipally owned storm drainage system, a watercourse, and any waters of the Commonwealth located within the boundaries of the Town of Watertown. 97.04 AUTHORITY This ordinance is adopted under authority granted by the Home Rule Amendment of the Massachusetts Constitution, the Home Rule statutes, and pursuant to the regulations of the federal Clean Water Act found at 40 CFR 122.34. 97,O5 RESPONSIBILITY FOR ADMINISTRATION The Watertown Department of Public Works shall administer, implement, and enforce the provisions of this ordinance. Any powers granted or duties imposed in compliance with this Ordinance may be delegated in writing by the Superintendent of Public Works to persons or entities acting in the beneficial interest of or as the authorized agent of the Department of Public Works. 97.06 ULTIMATE RESPONSIBILITY The standards set forth herein and promulgated pursuant to this ordinance are minimum standards; therefore compliance with the requirements of this ordinance or regulations promulgated thereunder shall not relieve a person from being subject to such enforcement actions as may be required to correct contamination, pollution, and/or unauthorized discharge of pollutants. 97.07 DISCHARGE PROHIBITIONS Prohibition of Illicit Discharges. No person shall discharge or cause to .be discharged into the municipal storm drain system or watercourses any materials, including but not limited to pollutants or waters containing any pollutants that cause or contribute to a violation of applicable water quality standards, other than stormwater. The commencement, conduct or continuance of any illicit discharge to the storm drain system is prohibited. Discharges or flow resulting from fire fighting activities are exempt. The following discharges are also exempt provided they are not significant sources of pollution: (a)Water line flushing or other potable water sources, landscape irrigation or lawnwatering, diverted stream flows, rising ground water, ground water infiltration to storm drains, uncontaminated pumped ground water, foundation or footing drains (not including active groundwater dewatering systems), crawl space pumps, air conditioning condensation, springs, non- commercial washing of vehicles, natural riparian habitat or wetland flows, swimming pools (provided the water is left untreated for one week prior to draining), and any other water source not containing Pollutants. (b) Discharges specified in writing by the authorized enforcement agency as being necessary to protect public health and safety or the environment. (e)Dye testing is an allowable discharge, but requires a verbal notification to the authorized enforcement agency prior to the time of the test. (d) Street sweeping activities that use water spray to suppress dust. (e)The prohibition shall not apply to any non-stormwater discharge permitted under an NPDES permit, waiver, or waste discharge order issued to the discharger and administered under the authority of the federal Environmental Protection Agency or the Department of Environmental Protection, provided that the discharge is in frill compliance with all requirements of the permit, waiver, or order and other applicable laws and regulations, and provided that written approval has been granted for any discharge to the storm drain system. Prohibition of Illicit Connections. (a)The construction, use, maintenance or continued existence of illicit connections to the storm drain system is prohibited. (b) This prohibition expressly includes, without lunitation, illicit connections made in the past, regardless of whether the connection was permissible under law or practices applicable or prevailing at the time of connection. (c) A person is considered to be. in violation of this ordinance if the person connects a line conveying sewage to the storm drainage system, or allows such a connection to continue. 97.08 SUSPENSION OF MS4 ACCESS Suspension due to Illicit Discharges in Emergency Situations The Watertown Department of Public Works may, without prior notice, suspend access to the MS4 when such suspension is necessary to stop an actual or threatened discharge which presents or may present imminent danger to the environment, the health or welfare of persons, the MS4. or Waters of the Commonwealth. If the violator fails to comply with a suspension order issued in an emergency, the authorized enforcement agency may take such steps as deemed necessary to prevent or minimize damage to the MS4 or Waters of the Commonwealth, or to minimize danger to persons or the environment. Suspension or Termination due to the Detection of Illicit Discharge Any person discharging to the MS4 in violation of this ordinance may have their MS4 access suspended or terminated if such action would abate or reduce an illicit discharge, A person commits an offense if the person reinstates MS4 access to premises terminated pursuant to this Section, without the prior approval of the authorized enforcement agency. 97.09 INDUSTRIAL OR CONSTRUCTION ACTIVITY DISCHARGES Any person subject to an industrial or construction activity NPDES stormwater discharge permit shall comply with all provisions of such permit. Proof of compliance with said permit may be required in a form acceptable to the Watertown Department of Public Works prior to the allowing of discharges to the MS4. 97.10 MONITORING OF DISCHARGES A, Applicability. This section applies to industrial facilities that are regulated and are required to have a permit to discharge under the EPA Multi -Sector General Permit (MSGP) and have stormwater discharges -impacting or suspected of impacting on the Watertown MS4, It also applies to any person subject to obtaining a NPDES Permit for construction activities. B. Access to Facilities. (a)To the extent permitted by state law and if probable cause exists, or if authorized by the owner or other party in control of the property, the Watertown Department of Public Works shall be permitted to enter and inspect facilities subject to regulation under this ordinance for the purpose of performing their duties under this ordinance as often as may be necessary to determine compliance with this ordinance, If a discharger has security measures in force which require proper identification and clearance before entry into its premises, the discharger shall make the necessary arrangements to allow access to representatives of the authorized enforcement agency. (b) Under the conditions for access stated in Section 10(13) (a) above, facility operators shall allow the Watertown Department of Public Works ready access to all pants of the premises for the purposes of inspection, sampling and examination and copying of records that must be kept under the conditions of an NPDES permit to discharge stormwater, and the performance of any additional duties as defined by state and federal law. (c)The Watertown Department of Public Works shall have the right to set up on any permitted facility such devices as are necessary in the opinion of the authorized enforcement agency to conduct monitoring and/or sampling of the facility's stormwater discharge. (d) The Watertown Department -of Public Works has the right to require the discharger to install monitoring equipment as necessary. The facility's sampling and monitoring equipment shall be maintained at all times in a safe and proper operating condition by the discharger at its own expense. All devices used to measure stormwater flow and quality shall be calibrated to ensure their accuracy. (e)Any temporary or permanent obstruction to safe and easy access to the facility to be inspected and/or sampled shall be promptly removed by the operator at the written or oral request of the Watertown Department of Public Works and shall not be replaced. The costs of clearing such access shall be bonne by the operator. (f)Unreasonable delays in allowing the Watertown Department of Public Works access to a permitted facility is a violation of this ordinance. The operator of a facility required to have a NPDES permit to discharge stormwater associated with industrial activity commits an offense if the person denies the Town reasonable access to the permitted facility for the purpose of conducting any activity authorized or required by this ordinance. (g) If the Watertown Department of Public Works has been refiised access to any part of the premises from which storm-vvater is discharged, and he/she is able to demonstrate probable cause to believe that there may be a violation of this ordinance, or that there is a need to inspect and/or sample as part of a routine inspection and sampling program designed to verify compliance with this ordinance or any order issued hereunder, or to protect the overall public health, safety, and welfare of the community, then the authorized enforcement agency may seek issuance of a search warrant from any court of competent jurisdiction, 97.11 WATERCOURSE PROTECTION Every person owning property through which a watercourse passes, or such person's lessee, shall keep and maintain that part of the watercourse within the property free of trash, debris, excessive vegetation, and other obstacles that would pollute, contaminate, or significantly retard the flow of water through the watercourse. In .addition, the owner or lessee shall maintain existing privately owned structures within or adjacent to a watercourse, so that such structures will not become a hazard to the use, function, or physical integrity of the watercourse. 97.12 NOTIFICATION OF SPILLS Notwithstanding other requirements of law, as soon as any person responsible for a facility or operation, or responsible for emergency response for a facility or operation has information of any known or suspected release of materials which are resulting or may result in illicit discharges or pollutants discharging into stormwater, the storm drain system, or Waters of the Commonwealth said person shall take all necessary steps to ensure the discovery, containment, and cleanup of such release. In the event of such a release of oil or hazardous materials said person shall immediately notify the Watertown Fire Department and the Massachusetts Department of Environmental Protection of the occurrence via emergency dispatch services. In the event of a release of non -hazardous materials, said person shall notify the Watertown Department of Public Works in person or by phone or facsimile no later than the next business day. Notifications in person or by phone shall be confirmed by written notice addressed and mailed to the Watertown Department of Public Works within three business days of the phone notice. If the discharge of prohibited materials emanates from a commercial or industrial establishment, the owner or operator of such establishment shall also retain an on -site written record of the discharge and the actions taken to prevent its recurrence. Such records shall be retained for at least three years. 97.13 ENFORCEMENT The Watertown Department of Public Works or an authorized agent of the Department shall enforce the provisions of this Ordinance and any regulations promulgated hereunder and may issue and prosecute violation notices and enforcement orders and may pursue all civil and criminal remedies for such violations. A. Civil Relief The Department of Public Works may seek injunctive relief in a court of competent jurisdiction to restrain a person from continued violations of the provision of this Ordinance or the regulations promulgated hereunder, or any notices, orders or written approvals or to compel said person to abate or remediate the violations hereunder. B. Orders The Department of Public Works or an authorized agent of the Department may issue a written order to enforce the provisions of this Ordinance and the regulations promulgated hereunder, which may include: (a) Elimination of illicit connections or discharges to the MS4; (b) Performance of monitoring, analysis, and reporting (c)That unlawful discharges, practices, or operations shall cease and desist; (d) Remediation of contamination in connection therewith; (e)Payment of a fine to cover administrative and remediation costs; and (f) Implementation of source control or treatment BMPs. If the enforcing person determines that abatement or remediation of contamination is required, the order shall set forth a deadline by which such abatement or remediation must be completed. Said order shall further advise that, should the violator or property owner fail to abate or perform remediation within the specified deadline, the Watertown Department of Public Works may, at its option, undertake such work, and expenses thereof shall be charged to the violator. C. Criminal Penalty Any person who violates any provision of this Ordinance, the regulations promulgated hereunder, or an order or written approval issued hereunder shall be subject to a fine after an Order or Notice of Violation is given up to $300.00 per violation. Each day or part thereof that such violation occurs or continues shall constitute a separate offense. D.Non-Criminal Disposition As an alternative to criminal prosecution or civil action, the Town may elect to utilize the non -criminal disposition procedure. set forth in M.G.L. c. 40, §211) and Section 35.05 of the Code of Ordinances. E. Appeals The decisions or orders of the Superintendent of Public Works shall be final, Further relief shall be to a court of competent jurisdiction. F. Remedies Not Exclusive The remedies listed in this section are not exclusive of any other remedies available under any applicable federal, state or local law. 97.14 SEVERABILITY The provisions of this Ordinance are hereby declared to be severable. If any provision, paragraph, sentence, or clause of this ordinance or application thereof to any person, establishment, or circumstances shall be held invalid, such invalidity shall not affect the other provisions or application of this Ordinance. 97.15 REGULATIONS The Watertown Department of Public Works may promulgate rules and regulations to effectuate the purposes of this ordinance. Failure to promulgate such rules and regulations shall not have the effect of suspending or invalidating this ordinance. 97.16 TRANSITIONAL PROVISIONS Residential property owners shall have sixty (60) days from the effective date of this ordinance to comply with its provisions, provided good cause is shown for the failure to comply with its provisions during that period. 97.17 ADOPTION OF ORDINANCE This ordinance shall be in full force and effect 15 days after its final passage and adoption. All prior ordinances and parts of ordinances in conflict with this ordinance are hereby repealed. t Council Member I hereby certify that at a regular meeting of the Town Council for which a quorum was present, the above Ordinance was adopted by unanimoyt-s)vgte on May 11, 2011. 9 aG!� Valerie Papas, Council Clerk Mark S. Siderls, Council President Mark S. Sideris, Council President ORDINANCE # 0-2018 — 7F9 Vincent J. Picciril Ii, Jr., Vice President Caroline Bays, ANIMAL CONTROL ORDINANCE Councilor At Large AnthWHEREAS, Title IX, Chapter 91, Animals, of the Watertown' Code of Ordinances Council rAtLar a addresses the keeping and management of�dogs, cats, and other animals in the interest Councilor At Large of protecting public health at>d safety as well as the health and safety of the subject Susan a, ralkok animals; and (Councilor At Large AnthonyPalomba, WHEREAS, the provisions of G.L. c, 140, W36A through 174FE-and associated Councilor At Large regulations Of the Cpmtnonwealth of Massachusetts ►'elative to the keeping of dogs and Angeline 13. Kounelis, other animals have been revised to better address public health and safety; and District A Councilor WHEREAS, it has been determined .to revise the Watertown Animal Control District B Coutner,ncilor Ordinance to be Consistent With the provisions of the laws of the Commonwealth and to District B Councilor address issues of public health and safety in the best interest of the Town. Kenneth M. Woodland, District D Councilor NOW THEREFORE BE IT ORDAINED by the Town Council of the.City Known as the Town of Watertown that Title IX, Chapter 91, Animals, of the Watertown Code of Ordinances, is hereby amended by deleting the language thereof in its entirety and inserting in its place, the following language: CHAPTER 91: ANIMALS §91.01 ; INTRODUCTION Acting under Massachusetts General Law and pursuant 0 Chapter 140, Section 136A through 174FE inclusive and under any other applicable laws -and regulations, tlio City of Watertown, known as the Town of Watellown, hereby adopts this ordinance in the interest of protecting the health and safoty of its Citizens, dogs, cats and wildlife, §91.02 - DEFINITIONS ANIMAL CONTROL AGENT: Any duly authorized employee or agent of the Town of Watertown who may enforce the provisions of tl►e Watertown Animal Control Ordinance; ANIMAL CONTROL OFFICER: An appointed, duly authorized employee of the Town of Watertown whose primary responsibility is to enforce the provisions of the Watertown A►►ltnal Control Ordinance and Massachusetts General Law, Chapter 140, Sections 136A-174F&inclus1vc. ANIMALS: All mammals, fowl and reptiles, except human beings. AT LARGE: Off the premises of tihe owner or keeper and not tinder the control of the owner or keeper either by leash, cord, chain or otherwise. DANGEROUS CAT: a cat that eitlid, (I) without justification, attacks a person off• domestic animal causing physical injury or death; or (ii) behaves in a manner that a reasonable person would believe poses an unjustified imminent threat of physical injury or death to a person or to a domestic or owned animal. DANGEROUSDOG. a dog that either: (I) without justification, attacks a person or domestic animal causing physical injury or death; or (ii) behaves in a manner that a reasonable person would believe poses an unjustified imminent threat of physical injury or death to a person or to a domestic or owned animal. DOMESTIC ANIMALS: An animal that has been domesticated by humans so as to live and breed in a tame condition and depends on lhuthhankind for survival; any animal listed in 321 Commonwealth of Massachusetts Regulations (CMR) 9.02(3), except as provided in 321 CMR 9.02(2)(d). FERAL CAT: A domestic cat who has been born and raised without contact to humans, or a domestic cat who has not had contact with humans for a significant period of time and has become un-socialized to humans; a Feral Cat is fearful of humans, may depend on humans for survival by means of a caretaker who provides food and a shelter, and is not likely to ever become an indoor cat. IMPOUND: Take into the custody of the Animal Control Officer or Animal Control Agent. INDOOR CAT: A domestic cat that lives in a dwelling or home, has a litter box, food, shelter, etc. provided by the keeper or owners and is never allowed outdoors; an Indoor Cat is dependent on humans for survival. KEEPER OR OWNER; Any person owning, possessing, controlling, harboring or having custody of an animal, LEASH. A restraint which shall be of an appropriate length and made of a sturdy, unfrayed material suitable to allow the dog owner or keeper to maintain control over the dog. A leash is used to restrain the dog when upon the streets, sidewalk or any public areas or to restrain the dog from entering these said areas. NUISANCE DOG: A dog that: (1) By excessive barking or other disturbance, is a source of annoyance to a sick person residing in the vicinity; or (2) By'excessive barking, causing damage or other interference, a reasonable person would find such behavior disruptive to one's quiet and peaceful enjoyment; or (3) Has threatened or attacked livestock, a domestic animal or a person, but such threat or attack was not a grossly disproportionate reaction under all the circumstances. OUTDOOR CAI: A domestic cat that lives in a dwelling or home; has a litter box, .food, shelter. etc. provided by the keeper or owner, but is also allowed outdoors for oily length of time during the clay; all Outdoor Cat is dependent on (humans for survival, SERVICE ANIMAL: In acco►•dance with the Americans with Disabilities Act (ADA) 28 Code of Federal Regulations Part 36.104, any dog that is individually trained to do work or perform tasks for the benefit of an individual with a disability, including a physical, sensory, psychiatric, intellectual,'or other mental disability. Service Animals must be harnessed, leashed or tethered, unless these devices interfere with the Service Animal's work or the individual's disability prevents using these devices. In that case, the individual must maintain control of tite animal through voice, signal, or other effective controls. Service anutials are allowed to accompany people with disabilities in all areas where public is allowed to go. Other species of animals, whether wild or domestic animals, trained or untrained, are not service animals'for the purpose of this definition. Dogs whose sole function is to provide comfort, emotional support, well-being or companionship do not qualify as service animals tinder the ADA. STRAY CAT: A domestic cat who is socialized to humans who has lived as a pet in a domestic home but has been abandoned, lost, or has left its domestic home; a Stray Cat is dependent on htimaps for survival. TOWN: The City known as the Town of Watertown, Massachusetts. UNCONFINED: Not securely confined indoors, or in a securely enclosed snd locked. pen or dog run area on the premises of the owner or keeper. WATERTOWNPOLICE OFFICER: Any duly authorized employee of the Watertown Police Departmet►t'who may enforce the provisions of the Watertown Animal Control Ordinance. WILDANIMAL: Any animal not kept as a domesticated animal and is indigenous to this area of the State, including but not limited to coyotes, raccoons, beavers, wild turkey, skunks, opossums, fishers, squirrels, chipmunks, t.odents, and more. §91..03 - DOG LICENSING (A) ANNUAL DOG LICENSING TEE: No person shall own or keep a dog, six months of age or older, Within the Town unless -an amtual license for such dog is obtained from the Town Clerk. The fee for such a license shall be $10.00 for each dog. The licensing period shall be from January 1st through December 31st. The license fee for each dog owned or kept by persons who are aged 60 or older shall be $5.00. The provisions of this Ordinance shall not apply to veterinary establishments that are subject to kennel licensing. Pursuant to MOL Ch. 140, section 139(c), no licensing fee shall be charged for a Service Animal. (B) RABIES VACCINATION' No dog shall be licensed titiless a valid rabies vaccination certificate is presented to the Town Clerk at the time of licensing. All dogs shall be vaccinated against rabies in accordance with MGL Ch. 140 section 145B. (C) ADDITIONAL RL UIRLMENTS:• No dog six months of age or older shall be licensed unless there is presented to the Town Clerk at the time of licensing either: (1) proof that the dog has been spayed or neutered, or (2) a statement sighed by a veterinarian stating a reason wlty spaying or neuterhtg Itas been delayed, or (3) a statement sigiied by the owner or keeper of the dog that a decision has been made not to spay or neuter the dog, or . (4) a statement signed by a veterinarian or the aithnal control officer that the animal appears to have been spayed or neutered in the past (D) BREEDER'S LICENSE: An annual breeder's license shall be obtained for any dog with respect to which a statement is presented that a decision has been made not to spay or neuter. The fee for such a breeder's license shall be $25.00 for each dog and such fee shall be in addition to the fee imposed pursuant to this Ordinance, Section 91.03 (A). (E) NUMBER O.i, LICENSED DOGS Not more than three dogs over six monntlns of age shall be kept in a household. Any variance to this number of licensed animals must first be approved by the Board of Health. (I%) LICENSE TAGS: All dogs shall display a dog license on their collar. The dog owner and/or keeper shall present the dog license.tag when request is made by the Animal Control Officer, Animal Control Agent, or Police Officer. Dogs not displaying dog licenses are subject to impoundment until licensure is attained. §91.04 - RESTRAINT OF DOGS Any person owning or keeping a dog shall not suffer or allow it to run at large in any of the streets or public ways, or places in the Town,w upon the premises of anyone other than the owner or keeper; unless the owner or occupant of such premises grants permission.. Under no circumstances shall a dog, even on a leash, be allowed on private property, unless specific permission has been granted. No dog shall be permitted in any public place or street within the Town of Watertown unless it is effectively restrained by a chain or leash, except at a Town designated dog park pursuant to Section 91.09 (E) of this chapter.. §91.05 - Restricted Areas BE,ESTRICTED AREAS: (1) No dog shall be on school property, in cemeteries, or in public parks maintained by the Town. Service Animals are exempt from this provision. (2) Notwithstanding the provisions'of Section 91.05 (1) above, dogs on leashes shall be permitted on marked or paved walking paths on Wl►itney Hill Park, Saltonstall Park, Arsenal Park, Linear Park, Filippello Park, Howe Pork and the park behind 552 Main Street, exclusive of athletic tracks and tot lot surfaces. (3) Notwithstanding the provisions of Section 91,05 (1).and 91.05 (2), dogs shall be permitted inside Town designated dog parks pursuant to Section 91.09 (E) of this chapter. §91.06 - RE, MOVAL Op' DOG WASTE (A) REMOVAL OT DOG WASTE RROMPUBLICAND PRIVATE, PROPERTY: Each person who owns or keeps a dog within the Town, shall immediately remove and dispose of any feces left by such dog on any sidewalk, planting strip, street, park or other public area, or on any private property which is ` not owned or occupied by such person. Any such dog is to be accompanied by a person carrying a device which is suitable fai picking up and containing feces, unexposed to such person and to the general public. (B) METHOD OF DOG WASTE DISPOSAL: Dag waste or feces may only be disposed of in a sanitary manner. Dog waste shall not be disposed of in catch basins, (C) EXEMPTIONS TO THE REMOVAL OF DOG WASTES. Section 91.06 (A) and 91.06 (B) shall not apply to a Service Animal accompanying any individual with a disability, who, by reason of a disability, is physically unable to comply with the requirements of said sections, §91.07 - IMPOUNDNMNT (A) NOTICE OFIMPOU11iDMENT. (1) it shall be the duty of any Animal Control Officer or his/her designee to apprehend any dog found running at large and/or any unlicensed dog in any street or public place within the Town and to impound such dog in the place provided therefore. (2) The owner or keeper of any dog so impounded may reclaim such dog within 7 days and upon paymeht of the license fee, if unpaid, all outstanding citations, boarding fees for each day the dog was held, all veterinary costs, and all other associated costs as applicable. (B) UNCLAIMED DOGS. The Animal Control Officer shall make reasonable efforts to determine the identity. of the owner or keeper of any dog, If any dog is impounded pursuant to this chapter and its owner and/or keeper cannoi be identified within seven days, the dog'may be put up for adoption or humanely euthanized, provided that the Animal Control Officer determines that all reasonable efforts have been made to locate the owner and/or keeper And there are no reasonable. alternatives to such action. §91.09 - CATS (A) CAT LICENSWG FEE: No person shall own or keep a cat, six months of age or older, within the Town unless fin annual license,for such cat is obtained from the Town Clerk, The fee for such a license shall be $10.00 for each cat. The licensing fee for each cat owned or kept by persons who are aged 60 or older shall be $5.00. (B)NUMBER OFLICENSED CATS: Not more than five cats over six months of age shall be kept in a household. Any yariance to this number of licensed animals must first be approved by the Board of Health. The provisions of this Ordinance shall not apply to veterinary cstabl 1 shments that are subjcot to kennel licensing, - (C) RABIES VACCINATION: No cat shall be licensed unless a valid rabies vaccination certificate, is presented to the Town Clerk at the time of licensing, All cats shall be vaccinated against rabies in accordance with MOL Ch. 140 section 145B. (D) OUTDOOR CATREQUMEM,NTS: (1) All cats allowed or found outdoors for any length oftime. shall be outfitted with a microchip. All cats allowed outdoors shall be spayed or neutered. Any cat found at- large that cannot be immediately identified shall be deemed a stray. (2) Exemptions _ This section shall not apply to a cat with a high likelihood of suffering serious bodily harm or death if spayed, neutered, or microchipped, due to age or infirmity. The owner or custodian must obtain written confirmation of this fact from a Massachusetts Licensed Veterinarian, -If 'the cat is able to be safely spayed, neutered, or microchipped at a later date, that date must be stated in the written confirmation. (E) STRAY CATS: Any.rescue group, humane society or other person or organization picking up stray eats shall notify the Animal Control Officer with all relevant information of each cat and the location found, (F) FERAL CATS: Any person or organization that traps and releases feral cats shall report such activity to the Animal Control Officer including information of description and numbers of cats trapped and name of caretaker. The caretaker is expected to take full responsibility for the duration of ti►e cat's life. All feral cats shall be car tipped. All feral cats shall be spayed or neutered. (G) DANGEROUS CATS: . The Animal Control Officer may at any time issue an order of confinement for any cat deemed a Dangerous Cat. §91.09 - MISCELLANEOUS (A)ANIMAL BITE PROCEDURE; All bites by dogs, cats or other domestic animals or wild or exotic animals shall be reported to the Health Department and the Aninial Control Officer as soon as possible by the person bitten or by the owner or keeper of the aninial, or both, (B) MOTOR VEHICLE OPERATOR RESPONSIBILITY. The'operator of a motor vehicle that -strikes, injures, or kills any animal within the Town shall report such incident to the pet's owner or keeper, custodian or to a Watertown Police Officer, (C)FEEDING OF WILDANIMALS. No person within the Town shall feed any wild animals, including without limitation, ducks, geese and raccoons, or any homeless dogs or cats, except birds fed within the confines of his /her private property, provided that no threat to public health or safety is thereby created. Persons feeding their own domestic animals shall do so only in a sheltered space inaccessible to wild or roaming animals.' This Section, 91.09 (C), shall not apply to the feeding of homeless dogs or cats if done in a sheltered place inaecessible,to wild or roaming animals with the express purpose of befriending the dog or cat in order to have it vaccinated, spayed, neutered and ultimately adopted. (D) WILD AND EXOTICANIMALS: No person within the Town shall possess, maintain, propagate, cultivate or deal with wild or exotic animals within the meaning of Chapter 131, Section 23, of the Massachusetts General Laws unless notice thereof has been filed with the Board of Health and all permits required by said Section 23 or otherwise have been obtained, (E) TOWNDOG PARKS (1) Owners and/or Keepers using a Town Dog Park must adhere to posted Dog Park Rules referenced on Town website and posted at each Town Dog Park. (2) Dog Pack Rules are enforced under the provisions of this' Ordinance, Any change in Dog Park Rules shall be communicated to (lie Town Council. (F) NUISANCE AND DANGEROUSDOGS• In accordance with the provisions of Chapter 140, Section 157 of the Massachusetts General Laws, any person may file written complaint to the Board of Health that a dog owned or kept in the Town is a nuisance or a dangerous dog. Tiie Board ofHealtli who has been appointed as the Hearing Authority shall process the complaint, hold a public hearing and make decision on the written complaint. (G) GENERAL PROHIBITION: No person shall own or keep in the Town any dog, cat or other household pet which by biting, barking, howling, scratching or crying, or'in any other manner, disturbs the peace and quiet of any neighborhood, destroys private property or endangers the safety of any person. §91.10 - ENFORCEMENT OF THE ANIMAL CONTROL ORDINANCE (A) CRIMINAL COMPLAINT: Any person whoMolates any provision of this Ordinance may be. penalized by indictment or on complaint brought in district court. Each day on which any violation or offense continues shall be. deemed to be a separate violation or offense. (B) NONCRIMINAL DISPWhoever violates any provision of this Ordinance, the violation of which is subject to a specific.penalty, may be penalized by the non -criminal method of disposition as provided in General Laws, Chapter 40, Section 21D. Each day on which any violation exists shall be deemed to be a separate offense. Penalty: $ 50.00 for first offense $ 100,00 for second offense $ 200.00 for third offense and thereafter (C) ENFORCING PLRSONS.,.Animal Control Officer, Animal Control Agent or any Watertown Police Officer. Any violations of this Ordinance that occur within Town parks or recreation areas are also enforceable by the Director of Parks and Recreation and/or his/her designee. (D) OTHER: Any person who violates any provision of this Ordinance is also subject, at the discretion of the Animal Control Officer, Animal Control Agent or Watertown Police Officer to any other legal or equitable enforcement remedy available. §91.11- ANIMAL CONTROL FUND All monies collected under the provisions of this ordinance, other than monies collected as penalties referenced in Section 91.10 (B), shall be deposited in a•revolving hind to be known as the Animal. Control Fund, established pursuant to the provisions of MGL Ch. 44, section 53E1/2. This revolving fund shall be accounted for separately froth all other monies in the Town, and expenditures may be made from the revolving fund without further appropriation. The Director of Public Health with the approval of the Town Manager shall be authorized to expend money from the Animal Control Fund, with such expenditures to be used only for programs and activities within the jurisdiction and authority of the Animal Control Program. The Animal Control Fund shall be established not later than the beginning of the fiscal year in which the fund shall begin. The limit on the total amount that may be expended from the Animal Control Fund shall be determined by Town Council on or before July X of each year. i hereby certify that at a regular meeting of the To-waXouneii for which a quorum, was present, the above Ordinance was adopted by a roll call vote of for, 0 against, present on °10 e 1,�jtLi " 20�8 I lylarilyr , Pronov st, Councl Clerk IvSar S. Slderls, CaUncll President Watertown Town Council ELECTED OFFICIALS: Mark S. Sideris, ORDINANCE # Council President Administration Building 149 Main Street Watertown, MA 02472 Plione: 617-972-6470 O-2016- �% Vincent J. Picniriui' Jr., AN ORDINANCE ESTABLISHING REQUIREMENTS FOR Vice President STORMWATER MANAGEMENT AND EROSION CONTROL Michael F. Dattoli, Councilor At Large Whereas, the establishment of minimum requirements and procedures to Aaron P. Dusbku, regulate land disturbance associated with construction activities serves the public Councilor At Large interest by reducing the adverse impacts of soil erosion and sedimentation from Susan G. Falkof, stormwater runoff; and Councilor At Large Anthony Palomba, Whereas, such regulation serves the objective of preventing pollutants Councilor At Large from entering into, and discharging from, the Town of Watertown's storm Angeline B. drainage system; and Kounelis, District A Councilor Whereas, the Town wishes to ensure that best management practices for stormwater controls, including long-term operation and maintenance practices for Lisa J. Feltner, District $Councilor stormwater facilities, are incorporated into land development and redevelopment' and Kenneth M. Woodland, District D Councilor 1> } Whereas, regulations adopted b y the United States Environmental Protection Agency under the Federal Clean Water Act require the Town to regulate stormwater runoff related to construction and post -construction activities, as a condition of the federal General Permit for Municipal Separate Storm Sewer Systems. NOW THEREFORE BE IT ORDAINED by the Town Council of the City Known as the Town of Watertown that Title 1X of the Watertown Code of Ordinances, "Business Regulations," is Hereby amended by the insertion of a new Chapter 98 as follows: CHAPTER 98: STORMWATER MANAGEMENT AND EROSION CONTROL CHAPTER 98: STORMWATER MANAGEMENT AND EROSION CONTROL §98.01 GENERAL PROVISIONS (A) Purpose The purpose of this Ordinance is to control storrnwater runoff into the Town of Watertown's Municipal Separate Storm Sewer System (MS4) and local water bodies to minimize stormwater runoff and prevent pollution. Specifically, the objectives are: (1) To protect, maintain, and enhance the public safety, environment, health, and general welfare by establishing minimum requirements and procedures to reduce the adverse impacts of soil erosion and sedimentation and manage stormwater runoff; (2) To control and prevent soil erosion and sedimentation resulting from construction site stormwater runoff; (3) To promote infiltration and the recharge of groundwater in order to minimize flooding; (4) To prevent pollutants from entering the Town's MS4 and to minimize discharge of pollutants from the MS4; (5) To ensure that stormwater management techniques, including Best Management Practices, are incorporated into the land disturbance, development, and redevelopment planning and design process in order to control soil erosion and sedimentation and stormwater runoff; (b) To ensure that the adequate long-term Operation and Maintenance of Best Management Practices (BMPs) is incorporated into the land disturbance, development, and redevelopment process and implemented in the future so that they work as designed; and (7) To comply with state and federal statutes and regulations relating to storrnwater runoff discharges. This Ordinance establishes the Town's legal authority to ensure compliance with the provisions of this Ordinance through permitting, inspection, maintenance, and enforcement. (B) Applicability A Stormwater Management and Erosion Control Permit shall be required prior to undertaking any alteration or land disturbance activity that: 2 (1) Will result in land disturbances of 5,000 square feet of total area or more, or smaller activities that are part of a larger common development plan that will disturb 5,000 square feet or more; (2) Will cause a net increase in site impervious surface area by more than 500 square feet; (3) Proposes to create or modify a direct connection to the MS4; or (4) In the opinion of the Department of Public Works, may result in an adverse impact on the MS4 or water resources of the Town of Watertown. (C) Exemptions The following activities are exempt from the requirements of this Ordinance, provided that such work must utilize the best practical measures to avoid any negative impacts on storrawater quality or runoff rate or volume: (1) Repairs to any stormwater treatment practice that are deemed necessary by the Department of Public Works. (2) Normal maintenance and improvement of land for the primary purpose of agriculture, horticulture, floriculture, or viticulture, or the use, expansion, or reconstruction of existing structures for the primary purpose of agriculture, horticulture, floriculture, or viticulture, to the extent protected under the Zoning Act, M.G.L Chapter 40A, Section 3. (3) Normal maintenance of landscaping, gardens, or lawn areas. (4) Reclamation and replacement of lawfully located, existing pavement at single-family or two-family residences, as well as reclamation and replacement of lawfully located, existing pavement at any parking lot containing fewer than 10 spaces. (5) Overlaying of existing pavement, with no increase in impervious area, (6) Construction of a fence or wall that does not alter the existing terrain or drainage patterns. (7) Emergency activities necessary for the protection of the health and safety of the public, provided that (a) the work is to be performed by or has been ordered by an agency of the Commonwealth of Massachusetts or a political subdivision thereof, (b) advance notice, oral or written, has been given to the Department of Public Works prior to commencement of work or within 24 hours after commencement, (c) the Department of Public Works or its duly authorized designee certifies the work as an emergency activity, and (d) the work is performed only for the time and place certified by the Department of Public Works for the limited purposes necessary to abate the ernergency. (8) Maintenance, repair or replacement of an existing and lawfully located structure or facility used in the service of the public to provide electric, gas, water, telephone, telegraph or other telecommunication services, provided that (a) there is no alteration in the terrain, ground cover or drainage patterns; and (b) written notice has been given to the Department of Public Works prior to commencement of work, (9) Maintenance, repair or replacement of existing drainage infrastructure, provided that (a) there is no alteration of the existing terrain or drainage patterns; (b) there is no increase in the size or capacity of the pipe; (c) there is no change in the drainage area contributing to the pipe; and (d) best practical measures are utilized to avoid any negative impacts on storinwater quality or runoff rate or volume. (10) Operation and maintenance of stormwater Best Management Practices, in accordance with an approved Operations and Maintenance Plan. (11) ' Normal maintenance of Town -owned public land, right-of-ways, public utilities, and appurtenances, including roadway reconstruction. (D) Simplified Permit The Department of Public Works shall have the authority to develop a Simplified Permit for specific types of projects. (1) The purpose of the Simplified Permit is to streamline the permitting process under this Ordinance by waiving certain submission requirements, provided a set of predetermined design standards are met. (2) The predetermined design standards shall be outlined in the Rules and Regulations authorized in accordance with Section 3.3 of this Ordinance. (3) By meeting the predetermined requirements and performance standards, the proposed project will be presumed to rnect the requirements and intent of this Ordinance. (E) Compatibility with Other Permit and Ordinance Requirements This Ordinance is not intended to interfere with, abrogate, or annul any other Ordinance, Rule or Regulation, Statute, or other provision of law in whole or in pant. The requirements of this Ordinance should be considered minimum requirements, and where any provision of this Ordinance imposes restrictions different from those imposed by any other Ordinance, Rule or Regulation, Statute or other provision of law, whichever 4 provisions are more restrictive or impose higher protective standards for human health or the environment shall be considered to take precedence. §98.02 DEFINITIONS Alter or Alteration: Any activity, which will change the ability of a ground surface to absorb water or will change existing surface drainage patterns. Alter may also be referred to as "alteration of drainage characteristics," and "conducting land disturbance activities." Applicant, Any person, as defined in this Ordinance, who has filed an application for a Stormwater Management and Erosion Control Permit. Best Management Practice (BMP): A structural or nonstructural technique for managing storrnwater to prevent or reduce nonpoint source pollutants from entering surface waters or ground waters, A structural stormwater Best Management Practice includes a basin, discharge outlet, swale, rain garden, filter, or other stormwater treatment practice or measure either alone or in combination, including without limitation any overflow pipe, conduit, weir control structure that: (a) is not naturally occurring; (b) is not designed as a wetland replication area; and (c) has been designed, constructed, and installed for the purpose of conveying, collecting, storing, discharging, recharging, or treating stormwater. Nonstructural stormwater Best Management Practices include source control and pollution prevention measures. Conveyance: Any structure or device, including pipes, drains, culverts, curb breaks, paved s,,vales and man-made swales, natural and man-made channels, and ditches designed or utilized to move or direct stormwater runoff or existing water flow; any impervious surface/sheet flow utilized to remove rainfall (for example, a parking lot) which drains directly onto a vegetated surface or public road without any curbing or drainage system to intercept the flow. Erosion Control: The prevention or reduction of the movement of soil particles or rock fragments due to stormwater runoff. Impervious Surface or Area: Any material or structure on or above the ground that prevents water from infiltrating through the underlying soil. Impervious surface is defined to include, without limitation: paved surfaces (parking lots, sidewalks, driveways, etc.), roof tops, swimming pools, and patios, as well as paved, gravel, and compacted dirt surfaced roads. Infiltration: Percolation of water into the subsurface. Also referred to as "Recharge." Land Disturbance Activity: Any activity that causes a change in the position or location of soil, sand, rock, gravel, or similar earth material. Low Impact Development (LID): A site design strategy for managing stormwater by 5 maintaining or replicating the predevelopment hydrologic functions through the use of design techniques to create a functionally equivalent hydrologic landscape. Maintenance: Maintenance of a stormwater management system rneans the work necessary to keep a stormwater management system functional and in good repair so that it may continue to operate as originally designed. Maintenance of a stormwater management system does not include work that (a) reduces the capacity of the system to treat stormwater, provide recharge, or attenuate peak flow; (b) increases the total or peak rate or volume of the stormwater managed by the system; (c) directs additional stormwater discharges to the system; or (d) results in reduced use of above ground stormwater Best Management Practices. Massachusetts Stormwater- Management Standards: The Standards issued by the Massachusetts Department of Environmental Protection (DEP), codified in regulations at 310 CMR 10.05(6)(k)-(q) and further defined and specified in the Massachusetts Stormwater Handbook, Volumes 1 through 3, issued by the DEP. The Standards address stormwater impacts through implementation of performance standards that reduce or prevent pollutants frorn reaching water bodies and control the quantity of runoff frorn a site. Municipal Separate Storm Server System (MS4): The system of conveyances designed or used for collecting or conveying stormwater, including any road with a drainage system, street, gutter, curb, inlet, piped storm drain, pumping facility, retention or detention basin, natural or man-made or altered drainage channel, reservoir, and other drainage structures that together comprise the storm drainage system owned or operated by the Town of Watertown. Operation and Maintenance Plan: A plan setting up the functional, financial, and organizational mechanisms for the ongoing operation and maintenance of a stormwater management system to ensure that it continues to function as designed. Overlay of Pavement: The placement of pavement on top of an existing impervious surface. The underlying surface is sometimes milled (partially ground down in thickness) before the overlay is placed. Owner: A person with a legal or equitable interest in land, structures, or equipment. Permittee: The person who is issued a permit by the Watertown Department of Public Works pursuant to this Ordinance. Person: An individual, partnership, association, firm, company, trust, corporation, agency, authority, department, or political subdivision of the Commonwealth or the federal government, to the extent permitted by law, and any officer, employee, or agent of such person. Pollutant; Any substance, either man-made or man -induced, that alters the chemical, physical, biological, or radiological integrity of water. Reclamation of Pavement: A procedure whereby existing pavement is broken and pounded into small fragments. Redevelopment: Development, replacement, rehabilitation, expansion, demolition, or phased projects that disturb the ground surface on previously developed sites. Sediment: Mineral or organic soil material that is transported by wind or water from its origin to another location; the product of erosion processes. Sedimentation: The process or act of depositing sediment. Simplified Permit: A permit issued for ail application that meets a set of predetermined standards adopted by the Department of Public Works in accordance with Section 98.01(B) of this Ordinance. Stormwater Management and Erosion Control Permit: A permit issued by the Department of Public Works, after review of an application, plans, calculations, and other supporting documents, in accordance with the provisions of this Ordinance. Stormwater Management Plan: A plan submitted as part of an application for a Stormwater Management and Erosion Control Permit, as required by Section 98.04(A) of this Ordinance. Stormwater Management SMtetn: the collective system for conveying, collecting, storing, discharging, recharging, or treating stormwater on -site, including stormwater Best Management Practices and any pipes and outlets intended to transport and discharge stormwater to the groundwater, a surface water, or a municipal separate storm sewer system. Also referred to as "drainage." Stormwater Runoff: Flow over the ground surface resulting from precipitation or snow and ice melt or through a drainage system. §98.03 AUTHORITY AND ADMINISTRATION (A) Authority This Ordinance is adopted under authority granted by the Hoene Rule Amendment of the Massachusetts Constitution, and the Home Rule Statutes and pursuant to the regulations of the federal Clean Water Act found at 40 CFR 122.34. (B) Administration 7 The Watertown Department of Public Works shall administer, implement, and enforce this Ordinance. Any powers granted to or duties imposed upon the Department of Public Works may be delegated to the Department's employees or agents. (C) Rules and Regulations The Town Manager may adopt, and periodically amend, Rules and Regulations relating to the detailed requirements, procedures, and administration of this Ordinance, including application and inspection fees. Failure by the Town Manager to promulgate such Rules and Regulations, or a declaration of their invalidity by a court of law, shall not have the effect of suspending or invalidating the provisions of this Ordinance or any permit issued hereunder. Such Rules and Regulations (or amendments thereto) shall become effective five days after being filed with the Town Clerk. (D) Appeals A decision of the Department of Public Works shall be final. A request for relief of a decision of the Department of Public Works shall be reviewable in the Superior Court in an action filed within 60 days thereof. §98.04 PERMIT PROCEDURES (A) Perinit Required No land disturbance activity that meets the criteria specified in Section 98.01(B) may commence prior to issuance of a Stormwater Management and Erosion Control Permit subject to this Ordinance. (B) Procedures and Requirements Permit procedures and requirements -- including but not limited to application, fee schedules, actions, right -of -entry, Stormwater Management Plan contents, technical requirements, inspections, and project closeout — shall be included as part of the Rules and Regulations promulgated under Section 98.03(C) of this Ordinance. §98.05 PERFORMANCE STANDARDS Criteria for Stormwater Management and Erosion Control Performance Standards shall be defined and included as part of the Rules and Regulations promulgated under Section 3.3 of this Ordinance. §98.06 ENFORCEMENT The Department of Public Works shall have authority to enforce this Ordinance and resulting Rules and Regulations, and shall issue orders, violation notices, and enforcement orders, and may pursue all available civil and criminal remedies for such 8 violations. (A) Notices and Orders (1) The Department of Public Works may issue a written order to enforce the provisions of the Stormwater Management and Erosion Control Ordinance or the Rules and Regulations, which may include requirements to: (a) Cease and desist from construction or land disturbance activity until there is compliance with the Stormwater Management and Erosion Control Ordinance and the Stormwater Management and Erosion Control Permit; (b) Repair, maintain, or replace the storinwater management system or portions thereof in accordance with the approved Operation and Maintenance Plan; (c) Perform monitoring, analyses, and reporting; and/or (d) Remediate adverse impacts resulting directly or indirectly from malfunction of the stormwater management system. (2) If the Department of Public Works determines that abatement or remediation of adverse impacts is required, the order shall set forth a deadline by which such abatement or remediation must be completed. (3) If a person violates the provisions of this Ordinance, regulations, permit, notice, or order issued thereunder, the Department of Public Works may seek injunctive relief in a court of competent jurisdiction restraining the person from activities which would create further violations or compelling the person to perform abatement or remediation of the violation. (B) Penalties Pursuant to Section 10.99 of the Town Code, any person who violates any provision of the Stormwater Management and Erosion Control Ordinance, or order or permit issued thereunder, may be ordered to correct the violation and/or shall be punished by a fine of not more than $300.00 per violation, excluding the cost of damages. Each day or part thereof that such violation occurs or continues shall constitute a separate violation. (C) Non -Criminal Disposition As an alternative to criminal prosecution, the Department of Public Works may elect to utilize the non -criminal disposition procedure set forth in M.G.L. c. 40, § 21D, which has been adopted by the Town in § 35.05 of the Town Code, for which purpose the Director of the Department of Public Works and the Department's employees shall be enforcing persons. The specific penalties under this provision shall be (a) $25 for the first offense, (b) $50 for the second offense, and (c) $100 for the third and any subsequent offense. 9 Notwithstanding the foregoing, the enforcing person shall have the discretion to issue a warning in Iieu of the citation for $25 for the first offense. (D) Appeals The decisions or orders of the Department of Public Works shall be final. Further relief shall be to a court of competent jurisdiction. (E) Remedies Not Exclusive The remedies listed in this Ordinance are not exclusive of any other remedies available under any applicable federal, state, or local law. §98.07 SEVERABILITY Any finding of the invalidity of any section, provision, paragraph, sentence, or clause of this Ordinance shall not invalidate any other section, provision, sentence, or clause thereof, nor shall it invalidate any permit or determination that has been previously issued under this Ordinance. AND FURTHER BE IT ORDAINED that the Watertown Code of Ordinances, Title IX, Chapter 97, is hereby amended by changing the title of said Chapter 97 from "Stormwater Regulations" to "Regulation of Discharges to the Municipal Storm Sewer System". 0,4) Council Member I hereby certify that at a regular meeting of the Town Council for which a quorum was present, the above Ordinance was adopted by a roll call vote of for, Q against, a present on February 23, 2016. Manly . Pronov st, Council Clerk 10 "'�J--7 Mark S. Sideris, Council President Town of Watertown Stormwater Management and Erosion Control Rules and Regulations Watertown Stormwater and Erosion Control Regulations Approved and Adopted by Town Manager Michael J. Driscoll, Watertown Town Manager Date Approved and Adopted Page 1 of 32 Town of Watertown Rules and Regulations for Stormwater Management and Erosion Control 1.0 Purpose The purpose of these Rules and Regulations is to preserve, maintain, and enhance the public health, safety, environment, and general welfare of the Town of Watertown by establishing minimum requirements and procedures to control the adverse effects of erosion and sedimentation, uncontrolled stormwater runoff, decreased groundwater infiltration, and nonpoint source pollution, as more specifically addressed in the Stormwater Management and Erosion Control Ordinance. 2.0 Definitions Agricultural Use: The cultivation and tillage of the soil; dairying; the production, cultivation, growing, and harvesting of any agricultural, aquacultural, floricultural, or horticultural commodities; the growing and harvesting of forest products upon forest land; the raising of livestock including horses; the keeping of horses as a commercial enterprise, the keeping and raising of poultry, swine, cattle, and other domesticated animals used for food and other agricultural purposes, including bees and fur -bearing animals; and any forestry or lumbering operations performed by a farmer, who is hereby defined as one engaged in agriculture or farming as herein defined, or on a farm as an incident to or in conjunction with such farming operations, including preparations for market, delivery to storage or to market or to carriers for transportation to market. Alter or Alteration: Any activity that will change the ability of a ground surface to absorb water or will change existing surface drainage patterns. Alter may also be referred to as "alteration" and "land disturbance activities." Applicant: Any person who has filed a Stormwater Management and Erosion Control Permit Application in accordance with these Rules and Regulations. Best Management Practice (BMP): A structural or nonstructural technique for managing stormwater to prevent or reduce nonpoint source pollutants from entering surface waters or groundwater. A structural stormwater Best Management Practice includes a basin, discharge outlet, Swale, rain garden, filter or other stormwater treatment practice or measure either alone or in combination including without limitation any overflow pipe, conduit, weir control structure that: (a) is not naturally occurring; (b) is not designed as a wetland replication area; and (c) has been designed, constructed, and installed for the purpose of conveying, collecting, storing, discharging, recharging, or treating stormwater. Nonstructural stormwater Best Management Practices include source control and pollution prevention measures, such as street/parking lot sweeping, catch basin cleaning, public education/outreach, etc. Approved and Adopted Page 2 of 32 Biofiltration: The process of reducing pollutant concentrations, particularly nutrients, in stormwater runoff by filtering through vegetative areas and organic media, allowing pollutants to be removed through the processes of sedimentation and biological action. Convey: Any structure or device, including pipes, drains, culverts, curb breaks, paved swales and man-made swales, natural and man-made channels, and ditches designed or utilized to move or direct stormwater runoff or existing water flow; any impervious surface/sheet flow utilized to remove rainfall (for example a parking lot) which drains directly onto a vegetated surface or public road without any curbing or drainage system to intercept the flow. Design Storm: A precipitation event of specified return frequency and duration (e.g., a storm that occurs only once every 2 years with 24 hour duration) that is used to calculate the stormwater runoff volume and peak discharge rate. Detention: The regulation and control of stormwater runoff by slowing the rate of discharge to reduce impacts downstream. Easement: A right in land acquired by a party to use or enter the property of another party for access, stormwater management, utilities, or other purpose. Engineer: A registered Professional Engineer (PE) licensed to practice professional engineering in the Commonwealth of Massachusetts. Erosion Control: The prevention or reduction of the movement of soil particles or rock fragments due to stormwater runoff. Erosion and Sediment Control Plan: A plan that shows the location and construction detail(s) of the erosion and sediment reduction controls to be utilized for a construction site during and after construction. Floodplain: Any land area susceptible to being inundated by floodwaters from any source which will theoretically result from the statistical 100-year frequency storm. The boundary shall be that determined by reference to the Flood Insurance Rate Map (FIRM) for the Town of Watertown, published by the Federal Emergency Management Agency (FEMA). If such data is unavailable, the boundary shall be the maximum lateral extent of floodwater which has been observed or recorded. Floodplain Contingency Plan: A plan establishing procedures for response to areas that have flooded or may be jeopardized by potential flooding. Floodway: The channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the 100-year frequency storm without cumulatively increasing the water surface elevation more than a designated height. The boundary shall be that determined by Approved and Adopted Page 3 of 32 reference to the Flood Insurance Rate Map (FIRM) for the Town of Watertown, published by the Federal Emergency Management Agency (FEMA). Impervious Surface or Area: Any material or structure on or above the ground that prevents water from infiltrating through the underlying soil. Impervious surface is defined to include, without limitation: paved surfaces (parking lots, sidewalks, driveways, etc.), roof tops, swimming pools, and patios, as well as paved, gravel and compacted dirt surfaced roads. Infiltration: Percolation of water into the subsurface. Also referred to as "Recharge." Land Disturbance Activity: Any activity that causes a change in the position or location of soil, sand, rock, gravel, or similar earth material. Low Impact Development LID): A site design strategy for managing stormwater by maintaining or replicating the predevelopment hydrologic functions through the use of design techniques to create a functionally equivalent hydrologic landscape. Maintenance: Maintenance of a stormwater management system means the work necessary to keep the system functional and in good repair so that it may continue to operate as originally designed. Maintenance of a stormwater management system does not include work that (a) reduces the capacity of the system to treat stormwater, provide recharge, or attenuate peak flow; (b) increases the total or peals rate or volume of the stormwater managed by the system; (c) directs additional stormwater discharges to the system; or (d) results in reduced use of above ground stormwater Best Management Practices. Massachusetts Stormwater Management Standards: The Standards issued by the Massachusetts Department of Environmental Protection (DEP), codified in regulations at 310 CMR 10.05(6)(k)-(q) and further defined and specified in the Massachusetts Stormwater Handbook, Volumes 1 through 3, issued by the DEP. The Standards address stormwater impacts through implementation of performance standards that reduce or prevent pollutants from reaching water bodies and control the quantity of runoff from a site. Maximum Extent Practicable: As defined in Section 8.2 of these Rules and Regulations. M.G.L.: Massachusetts General Laws. Municipal Separate Storm Sewer System MS4): The system of conveyances designed or used for collecting or conveying stormwater, including any road with a drainage system, street, gutter, curb, inlet, piped storm drain, pumping facility, retention or detention basin, natural or man- made or altered drainage channel, reservoir, and other drainage structures that together comprise the storm drainage system owned or operated by the Town of Watertown. National Pollutant Discharge Elimination System NPDES Discharge Permit: A permit issued by the United States Environmental Protection Agency or jointly with the Commonwealth of Approved and Adopted Page 4 of 32 Massachusetts that authorizes the discharge of pollutants to waters of the United States or Commonwealth. Operation and Maintenance Plan: A plan setting up the functional, financial, and organizational mechanisms for the ongoing operation and maintenance of a stormwater management system to ensure that it continues to function as designed. Overlay of Pavement: The placement of pavement on top of an existing impervious surface. The underlying surface is sometimes milled (partially ground down in thickness) before the overlay is placed. Owner: A person with a legal or equitable interest in land, structures, or equipment. Permittee: The person who is issued a permit by the Watertown Department of Public Works pursuant to these Rules and Regulations. Person: An individual, partnership, association, firm, company, trust, corporation, agency, authority, department, or political subdivision of the Commonwealth or the federal government, to the extent permitted by law, and any officer, employee, or agent of such person. Pollutant: Any substance, either man-made or man -induced, that alters the chemical, physical, biological, or radiological integrity of water. Reclamation of Pavement: A procedure whereby existing pavement is broken and pounded into small fragments. Recorded: Recorded in the Middlesex South District Registry of Deeds; if registered land is affected, filed with the recorder of the Land Court of Massachusetts. Redevelopment: Development, replacement, rehabilitation, expansion, demolition, or phased projects that disturb the ground surface on previously developed sites. Responsible Party: Any person or entity holding fee title to the property or acting as the Owner's representative, including any person, firm, corporation, or other entity performing services, contracted, subcontracted, or obligated by other agreement to design, implement, inspect, verify, or maintain the BMPs and other approved elements of stormwater management plans and permits. Retention: The process of collecting and holding stormwater runoff with no surface outflow. Sediment: Mineral or organic soil material that is transported by wind or water from its origin to another location; the product of erosion processes. Sedimentation: The process or act of depositing sediment. Approved and Adopted Page 5 of 32 Sheet Flow: A component of stormwater runoff in the form of an unconcentrated, overland flow or downslope movement of water as a thin, continuous film over relatively smooth soil, rock, or paved surfaces. Simplified Permit: A permit issued for an Application that meets a set of predetermined standards adopted by the Department of Public Works in accordance with Section 1.4 of the Stormwater Management and Erosion Control Ordinance. Stormwater Management and Erosion Control Permit: A permit issued by the Department of Public Works, after review of an application, plans, calculations, and other supporting documents, in accordance with the provisions of the Stormwater Management and Erosion Control Ordinance. Stormwater Management Plan: A plan submitted as part of an application for a Stormwater Management and Erosion Control Permit, in accordance with Section 7.0 of these Rules and Regulations. Stormwater Management System: The collective system for conveying, collecting, storing, discharging, recharging, or treating stormwater on -site, including stormwater Best Management Practices and any pipes and outlets intended to transport and discharge stormwater to the groundwater, a surface water, or a municipal separate storm sewer system. Also referred to as "drainage." Stormwater Pollution Prevention Plan (SWPPP): A site -specific document or collection of documents that identifies the potential sources of stormwater pollution, describes stormwater control measures, such as BMPs, to reduce or eliminate the identified pollutants, and identifies procedures operators will implement to comply with specific permit conditions. Stormwater Runoff. Flow over the ground surface resulting from precipitation or snow and ice melt or through a drainage system. Survey: A Professional Land Surveyor registered to practice land surveying in the Commonwealth of Massachusetts. Total Suspended Solids (TSS): Total suspended solids, as used in the context of the Massachusetts Stormwater Management Standards. Utilities: Private or municipal services, including, without limitation, telecommunications, cable, light and power, gas, sanitary sewers, drainage, water mains, and appurtenances. Zoning Enforcement Officer: The person responsible for enforcing the Town of Watertown Zoning Ordinance. Approved and Adopted Page 6 of 32 3.0 Authority The Rules and Regulations contained herein have been adopted by the Department of Public Works in accordance with Section 3.3 of the Town of Watertown Stormwater Management and Erosion Control Ordinance. 4.0 Administration The Watertown Department of Public Works shall administer, implement, and enforce these Rules and Regulations. Any powers granted to or duties imposed upon the Department of Public Works may be delegated to the Department's employees or agents. 5.0 Applicability All activities subject to the Stormwater Management and Erosion Control Ordinance (as set forth in Section 1.2 of the Ordinance) must obtain a Stormwater Management and Erosion Control Permit. 6.0 Permit Procedures and Requirements Projects requiring a Stormwater Management and Erosion Control Permit shall be required to submit the materials specified in this Section and are required to meet the Performance Standards specified in Section 8.0. 6.1 Application Requirements An Applicant seeking to perform a land disturbance activity subject to the Stormwater Management and Erosion Control Ordinance shall submit to the Department of Public Works a Stormwater Management and Erosion Control Permit Application on a form provided for that purpose. Except as provided for in Section 12.0, an application must be accompanied by the following: • a Stormwater Management Plan meeting the requirements of Section 7.0; and • a non-refundable Application Review Fee, as provided in Section 6.4.2. The Stormwater Management and Erosion Control Permit Application must be signed by an Engineer, who will verify that the design of all stormwater management practices meet the requirements of these Rules and Regulations. No Stormwater Management and Erosion Control Permit shall be issued until a satisfactory Stormwater Management Plan that meets the requirements of Section 7.0 and Performance Standards of Section 8.0 has been reviewed and approved by the Department of Public Works. 6.2 Application Procedure 6.2.1 An application for a Stormwater Management and Erosion Control Permit may be filed with the Department of Public Works on any regular business day. Approved and Adopted Page 7 of 32 6.2.2 Permit applications shall include two copies of the Stormwater Management Plan, including all documents required in accordance with Section 7.0 of these Rules and Regulations, and the Application Review Fee, in accordance with Section 6.4.2. 6.2.3 Within 45 days of the receipt of a complete permit application, including all documents as required herein, the Department of Public Works shall inform the Applicant whether the Stormwater Management and Erosion Control Permit has been approved or disapproved, in accordance with Section 6.5. 6.2.4 If the permit application or one or more of the required plan components is disapproved, the Applicant may make the necessary revisions and resubmit the application. The Department of Public Works shall have 45 days from the date the additional information or revised application is received to inform the Applicant that the application and required plans are either approved or disapproved, in accordance with Section 6.5. 6.3 Right -of -Entry for Inspection During the application process, the Department of Public Works, its employees and agents (including consultants) may conduct site visits of the project site to review the information presented in the application. As provided in Section 10.0 of these Rules and Regulations, inspections shall be required during the construction of the project. To the extent permitted by law, or if authorized by the owner or other party in control of the property, the Department of Public Works, its agents and employees may enter upon the site of a completed project at reasonable times and in a reasonable manner for the purpose of ensuring continuing compliance with the terms and requirements of the Ordinance, these Rules and Regulations, or an approved Stormwater Management and Erosion Control Permit. 6.4 Application Review Fees and Technical Review 6.4.1 General The Department of Public Works shall obtain with each submission an Application Review Fee established by the Department to cover expenses connected with the review of an application and issuance of a Stormwater Management and Erosion Control Permit. A Technical Review Fee, sufficient to cover professional review services for the project, may also be required in accordance with Section 6.4.3. 6.4.2 Application Review Fee 1. A non-refundable Application Review Fee of the larger of $50.00 or $0.0030 per square foot of land area that will be disturbed by activities authorized by the Stormwater Management and Erosion Control Permit shall be due and payable to the Town of Watertown at the time an application is filed. 2. These fees are in addition to any other local or state fees that may be charged under any other law, regulation, or local ordinance. Approved and Adopted Page 8 of 32 6.4.3 Technical Review Some permit applications may require the Department of Public Works to engage the employment of outside consultants for specific expert services deemed necessary by the Department to come to a final decision on the application. These services may include, but are not limited to, wetland survey and delineation, hydrologic and drainage analysis, hydrogeologic analysis, stormwater quality analysis, site inspections, as -built plan review, and analysis of legal issues. 1. The consultant shall be chosen by, and report only to, the Department of Public Works. The fee charged by the consultant shall be paid for by the Applicant. 2. The Department of Public Works shall give written notice to the Applicant of the selection of an outside consultant, which notice shall state the identity of the consultant and the fee to be charged. Such notice shall be deemed to have been given on the date it is mailed or hand delivered. 3. The Applicant shall provide written confirmation to the Department of Public Works that such fee shall be paid for by the Applicant. The consultant may require that a retainer be paid prior to initiating work. Failure by the Applicant to confirm acceptance of the consultant fee and pay the retainer, if required, within ten (10) business days of written notice by the Department of Public Works shall be cause for the Department to determine that the application is incomplete. 4. The services of the consultant shall be paid in full by the Applicant prior to issuance of a Stormwater Management and Erosion Control Permit. 6.5 Actions The action of the Department of Public Works, rendered in writing, shall consist of one of the following: 1. Approval of the Stormwater Management and Erosion Control Permit Application based upon determination that the proposed plan • meets the Performance Standards in Section 8.0; • will adequately protect the water resources of the community; and • is in compliance with the requirements set forth in these Rules and Regulations; 2. Approval of the Stormwater Management and Erosion Control Permit Application subject to written conditions, modifications, or restrictions required by the Department of Public Works that will ensure that the project meets the Performance Standards in Section 8.0 and adequately protects the water resources of the community, as set forth in these Rules and Regulations; 3. Disapproval of the Stormwater Management and Erosion Control Permit Application based upon a determination that the proposed plan, as submitted, is incomplete, does not meet the Application Requirements in Section 7.0 or the Performance Standards in Section 8.0, or does not adequately protect the water resources of the community, as set forth in these Rules and Regulations; or Approved and Adopted Page 9 of 32 4. Disapproval of an Application "without prejudice" where an Applicant fails to provide requested additional information that, in the opinion of the Department of Public Works, is needed to adequately describe the proposed project. 6.6 Failure of the Department of Public Works to take action upon receipt of an application accepted by the Department as complete within 45 days (or such additional period that is agreed to in writing by the Applicant) shall be deemed to be approval of said application. 6.7 Lapse of Permit A Stormwater Management and Erosion Control Permit granted in accordance with the provisions of these Rules and Regulations shall lapse one (1) year from the date of issuance, if land disturbance activities have not begun by such date except for good cause, as determined by the Department of Public Works. 6.8 Project Changes The Permittee, or its agent, shall notify the Department of Public Works in writing of any change or alteration in an approved Stormwater Management Plan before any change or alteration occurs. If the Department of Public Works determines that the change or alteration is significant, based on the standards referred to in Section 8.0 and accepted construction practices, the Department of Public Works may require that an amended Stormwater Management and Erosion Control Permit Application be filed. If any change or deviation from the Stormwater Management and Erosion Control Permit occurs during a project, the Department of Public Works may require the installation of interim measures before approving the change. 6.9 Project Completion 6.9.1 Upon completion, the Permittee is responsible for certifying that the completed project is in accordance with the approved plans and specifications by submitting As -built Plans to the Department of Public Works as described in Section 11.0. 6.9.2 Upon written request by the Permittee, the Department of Public Works shall assess whether the work has been completed in substantial conformance with the approved Stormwater Management Plan and any conditions of the Stormwater Management and Erosion Control Permit. Upon satisfactory completion of the work and submittal of the As -built Plans, the Department of Public Works shall issue a letter indicating that all required certifications have been submitted and all required inspections have been completed. 6.10 Maintenance Responsibility The Responsible Party shall ensure that all components of the proposed Stormwater Management Plan are functioning according to manufacturer or design specifications. All components shall be maintained in good condition and promptly repaired, in accordance with the approved Operation Approved and Adopted Page 10 of 32 and Maintenance Plan. This shall constitute a perpetual condition of any Stormwater Management and Erosion Control Permit issued under these Rules and Regulations. 7.0 Stormwater Management Plan The Stormwater Management Plan shall contain sufficient information for the Department of Public Works to evaluate the environmental impact, effectiveness, and acceptability of the measures proposed by the Applicant for preventing adverse impacts from stormwater. All Stormwater Management Plans submitted for consideration shall contain the following minimum components: 1. Existing Conditions Plan; 2. Proposed Conditions Plan; 3. Erosion and Sediment Control Plan; 4. Construction Detail Plan; 5. Stormwater Management Report; and 6. Operation and Maintenance Plan. More information than the minimum required herein may be required, provided such information is reasonably necessary for the proper evaluation of the Stormwater Management Plan. Additional plans, such as but not limited to utility plan, landscaping plan, etc., may be required for more complex projects. Plans shall be prepared to fully detail and explain the intentions of the Applicant. Plans shall be prepared at a standard scale (1" = 20', 1" = 40', or 1" = 80', whichever is appropriate to the size of the proposal). All plans shall include a reasonable numbering system with an appropriate title block, North arrow, signature block, and legend identifying any representative symbols used on the sheet in question. Design Certification: Each plan sheet shall show the seal and signature of an Engineer or a Surveyor, or both, as appropriate to the data. 7.1 Existing Conditions Plan The Existing Conditions Plan shall contain all the necessary information to convey existing surface features and drainage patterns. It shall contain a topographical survey plan prepared by a Surveyor, including the following information: Name, seal, and signature of the Surveyor who performed the survey. Date(s) of the survey. Reference to all deeds, plans of record, and other information used to establish the existing property lines, the layout of all streets and ways, and easements, including deed references to the abutting lots. Approved and Adopted Page 11 of 32 • Locus Plan, prepared at a scale not smaller than 1" = 1200' and a minimum extent of one mile diameter. Major streets, buildings, brooks, streams, rivers, or other landmarks should be shown on the Locus Plan with sufficient clarity to be easily discernible. • Existing property lines, easements, and road layouts with bearings and distances. All distances shall be in feet and decimals of a foot and all bearings shall be given to the nearest ten seconds. The error of closure shall not exceed one to ten thousand. • Boundary of the entire parcel held in common ownership by the Applicant regardless of whether all or part is being developed at this time. • Acreage of the parcel(s) to the nearest tenth of an acre. • Existing monuments. • Location and name of all abutters as they appear on the most recent tax list, including owners of the property on the opposite side of all streets abutting the property. • Location, names, status (i.e., public or private), and present widths of streets and sidewalks bounding, approaching, or within reasonable proximity of the property, showing both roadway widths and right-of-way width. • Location of all test pits, borings, percolation tests, or similar, in or adjacent to the development. Logs of observed groundwater elevations and other test data shall be included in the Stormwater Management Report. • Location of all existing buildings and structures on the property and within reasonable proximity of the perimeter of the property. • Location of all existing wells and septic systems that can be observed and/or are on file with the Health Department, on the property and within reasonable proximity of the perimeter of the property. • Site features within and abutting the property, including but not limited to, waterways, water bodies, drainage ditches, streams, brooks, stone walls, fences, curbing, walkways and other paths (paved or unpaved), utility and light poles, buildings and other structures, ledge outcrops, wooded areas, public shade trees and all other trees greater than six inches in caliper, and historic sites. • Location and identification of resource areas regulated under the Massachusetts Wetlands Protection Act or the Watertown Wetlands Ordinance, as amended, including areas located within the property and areas outside of the property with buffer zones or offsets that may intersect the property. This shall include wetlands and associated offsets and buffer zones, isolated lands subject to flooding (ILSF), bordering land subject to flooding (BLSF), and riverfront protection areas. If a currently valid delineation for the property does not exist, wetland boundaries shall be delineated in the field with numbered flags by a qualified wetlands specialist, surveyed, and shown on the plan(s) with reference to the Rag numbers. The date of any Resource Area Delineation, Determination of Applicability, Order of Conditions, or other applicable decision from the Watertown Conservation Commission shall be indicated on the plans. • Location of all existing above- and below -ground utilities and all associated appurtenances within and abutting the property. All utility pipe types, sizes, lengths, and slopes shall be provided, as well as utility structure information, including rim and invert elevations. • Existing topography within the property and within reasonable proximity of the perimeter of the property. Topography shall be provided at a minimum one -foot contour intervals. Approved and Adopted Page 12 of 32 The plan survey datum shall be the National American Vertical Datum 1988 (NAVD88), and this reference shall be identified on the plans. • Stormwater flow direction. 7.2 Proposed Conditions Plan The Proposed Conditions Plan shall indicate all proposed site improvements, including but not limited to structures, buildings, sidewalks, handicap ramps, parking areas, curb type and limits, walls, fences, landscaped areas, and the proposed location of all utilities, as described below: • All applicable information from the Existing Conditions Plan. The proposed improvements shall be overlaid on the existing conditions and shown in a darker line weight. • The boundaries of the site, the outline or footprint of all proposed buildings, structures, parking areas, walkways, loading facilities, or significant landscaping features shall be shown. • All means of vehicular access for ingress and egress to and from the site onto the public streets. Plans should show the size and location of driveways and curb cuts. • The location and type of all above -ground and below -ground utilities. • The existing and proposed stormwater management system, with pipe sizes, lengths, slopes, and materials including conveyances, catch basins, manholes, culverts, headwalls, detention and/or retention basins, treatment units, infiltration systems, and outlet pipes/structures. Rim and invert elevations shall be provided for all structures and other appurtenant features. • Proposed contours indicating the finished grades of all proposed construction in the property. The plan shall show how the proposed grades will tie in to the existing grades within and outside of the property. The grades should be provided at a minimum one -foot contour intervals. Walls, curbing and any other features creating a break in grade shall be shown, including proposed top and bottom grades. • Stormwater flow direction. 7.3 Erosion and Sediment Control Plan The Erosion and Sediment Control Plan shall contain sufficient information to demonstrate that erosion will be minimized and sediment contained as part of a land disturbance activity, including the following: • All applicable information from both the Existing and Proposed Conditions Plans. The proposed development information shall be shown in a darker line weight. • Location of the proposed limit of work, to be lined by a row of hay bales and silt fencing in downgradient areas and along all resource areas. • Location of anti -tracking area at each construction entrance. • Hay bale and silt fence protection and/or silt sacks at all existing and proposed drainage structures. • Seeding, sodding, or revegetation plans and specifications for all unprotected or unvegetated areas. Approved and Adopted Page 13 of 32 • Location and design of all structural erosion and sediment control measures, such as grade stabilization structures, temporary drainage swales, and temporary sedimentation basins. • Location of all proposed construction stockpiling areas with appropriate erosion and sediment control measures. • Notes detailing the proposed operation, maintenance, and inspection schedule for all erosion and sedimentation control measures, including proposed schedule for street sweeping of adjacent roadways and paved areas. • Where a project is proposed to be constructed in phases, requires demolition, includes significant cuts and fills, or requires excavation of contaminated soils, the Department of Public Works may require that the Erosion and Sediment Control Plan be separated into phases targeted to each activity. • Where a site is located in whole or in part within the floodplain, a Floodplain Contingency Plan shall be included with the Erosion and Sediment Control Plan. The Floodplain Contingency Plan shall describe the steps necessary to stabilize the site during construction in the event of a possible flood. A possible flood shall be defined as the period of time that a flood watch is declared for the Charles River by the National Weather Service. • Where a project is also subject to coverage under a National Pollutant Discharge Elimination System (NPDES) Discharge Permit issued by the EPA, submission of the Stormwater Pollution Prevention Plan (SWPPP) shall be required prior to commencement of land disturbance activities. 7.4 Construction Detail Plan The Construction Detail Plan should provide information regarding the component parts of the construction, illustrating how they fit together. The plan shall show the following: • Typical construction details of all proposed stormwater management system devices, including but not limited to conveyances, catch basins, manholes, headwalls, sub -drains, detention and retention systems, and other stormwater management system structures. • Landscaping details including, but not limited to, tree plantings, shrubs, perennials, fences, walls, guard rails, street furniture, and other specialty items, if applicable. • Construction details for all hard surfaces, including but not limited to, roadways, sidewalks, driveways, loading docks, handicap ramps, permeable pavers, and curbing. • Erosion and sediment control details that implement the Erosion and Sediment Control Plan. • Where site constraints or differing conditions require work that deviates from "typical details," specific construction details shall be provided. 7.5 Stormwater Management Report A separate Stormwater Management Report shall be submitted with the Stormwater Management and Erosion Control Permit Application. It shall be prepared and stamped by an Engineer, and shall contain the following information: Approved and Adopted Page 14 of 32 Narrative describing existing and proposed soil conditions (including Hydrologic Soils Group [HSG] classification published by the National Resources Conservation Service [MRCS]), land use, surface cover, estimated high groundwater elevations, design points, drainage patterns, and proposed stormwater management practices. Narrative describing the proposed stormwater management system, including all proposed LID techniques and BMPs incorporated in the project design. Description of all soil testing conducted in the study area, including sieve analyses, tests for saturated hydraulic conductivity, test pits, or soil borings. Soils information shall be based on field investigations by a Soil Evaluator approved by the Commonwealth of Massachusetts, or by an Engineer. Testing shall be performed in accordance with Volume 3 of the Massachusetts Stormwater Handbook (dated February 2008, as amended) and these Rules and Regulations. Raw test data shall be provided in an appendix to the report. Narrative describing the methodology used to conduct the hydrologic and hydraulic analyses of the site, estimates of the existing and proposed stormwater runoff peak rates and volumes, and the design of the proposed stormwater management system. Tables comparing existing and proposed impervious areas, peak stormwater runoff rates, and total stormwater runoff volumes for each design point and for the 2-, 10-, 25-, and 100-year design storms. Narrative and calculations demonstrating compliance with the Massachusetts Stormwater Management Standards, including: o Estimates of annual required recharge volume and recharge volume provided. o Estimates of average annual Total Suspended Solids (TSS) removal. o Narrative describing the Erosion and Sediment Control Plan, including a detailed construction sequence plan, source control and pollution prevention measures, description of BMPs provided to address soil erosion and sedimentation, stabilization measures, inspection and maintenance requirements, and record keeping. o Narrative describing the Operations and Maintenance Plan, as described in Section 7.6. • Description of any impacts to the floodplain and floodway and a summary of compensatory flood storage calculations, if appropriate. • Description of existing and proposed groundwater recharge on the site, including quantitative summary of existing and proposed recharge volumes, and summary of groundwater mounding analysis, if applicable. • Map(s) showing pre- and post -development drainage areas, including any off -site contributions, and time of concentration travel flow -paths. Study design points should be indicated on the plan. • If applicable, a map showing the location of the site overlaid on the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Map (FIRM) for the Town of Watertown, or other appropriate information pertaining to location of the floodplain and floodway boundaries in relation to the site. • Appendix containing all drainage calculations for existing and proposed conditions, including hydrologic analysis of the site, hydraulic analysis of the proposed drainage system, and calculations supporting the design of all BMPs that will control stormwater runoff peak rates and total volumes. Approved and Adopted Page 15 of 32 7.6 Operation and Maintenance Plan An Operation and Maintenance (O&M) Plan, in accordance with the Massachusetts Stormwater Management Standards, shall be included with the Stormwater Management Plan. The purpose of the plan is to identify the actions necessary to ensure that stormwater management systems and BMPs function as designed, in perpetuity. 7.6.1 Minimum Requirements At a minimum, the O&M Plan shall contain: • A plan that is prepared to scale and shows the location of all stormwater management system components and all discharge points. • A. description of all BMPs, including proper operating parameters and how the Owner will determine if a BMP is not functioning properly. • A description of long-term source control and pollution prevention measures. • An inspection log and a description of all inspection and maintenance procedures, responsibilities, and frequencies. • Snow storage procedures and locations in accordance with the MassDEP Snow Disposal Guidance, dated March 8, 2001, as amended. • The name(s) of the Owner of all components of the system, and the name(s) and address(es) of the Responsible Party for O&M of each component, if different from the Owner. • A list of easements held to access any BMPs. • A copy of the As -built Plan prepared in accordance with Section 11.0, upon project completion. • An estimated O&M budget. 7.6.2 Record Keeping Parties responsible for the O&M of the Stormwater management system and BMPs shall keep records of all inspections, maintenance, and repairs and shall retain the records for at least five (5) years. These records shall be made available to the Department of Public Works during inspection of the stormwater management structure or system and at other reasonable times upon request. The Town reserves the right to request written records, including receipts of inspection or cleaning services, documenting the maintenance of the system, and/or to physically inspect the systems to ensure that the proper maintenance has been carried out. The failure of the Responsible Party or Owner to maintain the stormwater management system in reasonable order and condition, in conformance with the approved Operation and Maintenance Plan, shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 6.0 of the Ordinance. Approved and Adopted Page 16 of 32 7.6.3 Changes to Operation and Maintenance Plans The Owner(s) of the stormwater management system must notify the Department of Public Works of changes in ownership or assignment of financial responsibility for O&M of the stormwater infrastructure and management system or any changes to the Operation and Maintenance Plan. This shall be an on -going requirement of any Stormwater Management and Erosion Control Permit issued. 8.0 Performance Standards At a minimum, all projects shall comply with the performance standards of the Massachusetts Stormwater Management Standards, except as hereafter amended in these Rules and Regulations. 8.1 Retention Standard For all new development and redevelopment projects, stormwater management systems must be designed such that all stormwater runoff is retained on -site to the Maximum Extent Practicable (MEP). The purpose of this policy is to provide reductions in stormwater flows to enhance the function of the MS4, to reduce the loading of pollutants in the MS4, to support compliance with the Final Phosphorous Total Maximum Daily Load (TMDL) Report for the Charles River Basin, and to reduce water quality impairments. The intent of this standard is to provide on -site stormwater retention measures (such as infiltration) for all storm events up to and including the 100-year, 24-hour storm. 8.2 Maximum Extent Practicable For the purposes of these Rules and Regulations, the Maximum Extent Practicable shall mean: • Applicants have demonstrated that they have made all reasonable efforts to meet the applicable requirements; • Applicants have made a complete evaluation of possible stormwater management measures which could be used on -site, including environmentally sensitive site design that minimizes land disturbance and impervious surfaces, employs LID techniques, and implements stormwater BMPs; and • If not in full compliance with the applicable requirements, Applicants are implementing the highest practicable level of stormwater management. 8.3 Factors Affecting Retention Potential The Town of Watertown recognizes that site constraints may make it difficult to retain all stormwater on -site. These constraints include: • Lack of space: The ability to provide infiltration BMPs on -site may be limited on small parcels or in densely developed areas. Sites may be located in areas of high land costs, where full compliance would result in a significant loss of development value. In some Approved and Adopted Page 17 of 32 zoning districts, the Town's desire to encourage density development may conflict with the goal of retaining all stormwater on -site. In densely developed areas, infiltration BMPs may also have a negative impact on groundwater elevations on adjacent properties. • Soils: The presence of bedrock, clay, or can limit the effectiveness of infiltration BMPs. • Groundwater: Depth to high groundwater may also limit the effectiveness of infiltration BMPs. • Prior contamination: Many redevelopment sites have a history of documented environmental contamination that limits the type of infiltration BMPs that may be employed. • Underground utilities: The presence of underground utilities can greatly reduce the amount of land available for on -site stoimwater management controls. 8.4 Criteria for Determining Maximum Extent Practicable The Town shall determine that the retention standard has been met to the Maximum Extent Practicable when the following criteria have been met: 8.4.1 Factors affecting retention potential, as described in Section 8.3 of these Rules and Regulations, have been identified on -site and preclude the ability to fully meet the retention standard. 8.4.2 Appropriate measures to reduce stoimwater runoff from the site have been provided through better site design practices, such as removing extraneous parking, reconfiguring required parking, minimizing the use of impervious materials, and providing enhanced vegetation. 8.4.3 Appropriate measures have been taken to disconnect roof runoff from direct discharge to the drainage system. 8.4.4 Appropriate measures have been taken to disconnect other existing paved areas from direct discharge to the drainage system, allowing controlled flow over pervious areas or through BMPs providing at least partial recharge. 8.4.5 Appropriate measures have been taken to apply LID techniques for runoff reduction. Measures such as, but not limited to, porous pavement, green roofs, rain gardens, bioretention areas, and rainwater harvesting and reuse have been considered. 8.4.6 There shall be a documented reduction in the rate and volume of runoff. In no instance shall there be an increase in the rate or volume of runoff from a redeveloped site. 8.4.7 The design provides for treatment of all runoff from existing (as well as new) impervious areas to achieve the 80% TSS removal rate specified in the Massachusetts Stoimwater Management Policy. 8.4.8 All other elements of the Massachusetts Stoimwater Management Policy are met. 8.5 Documentation of Maximum Extent Practicable It shall be the responsibility of the Applicant to show that on -site stormwater management control measures have been provided to the Maximum Extent Practicable according to the above criteria. Approved and Adopted Page 18 of 32 Additional information shall be provided in the form of both a narrative and supporting documentation, to be included in the Stormwater Management Report: A description of the site -specific conditions that affect the ability to retain stormwater runoff, An alternatives analysis of all LID techniques and BMPs considered to reduce and manage stormwater runoff; Hydrologic and hydraulic estimates of stormwater runoff peals rates and total volumes from the site for the 2-, 10-, 25-, and 100-year design storms, demonstrating compliance with criteria 8.4.6. A narrative explaining the degree to which stormwater runoff will be contained on -site shall accompany the estimates. 8.6 Off -site Work In the event that all stormwater runoff cannot be retained on -site, the Department of Public Works may permit BMPs to be implemented at other locations, preferably within the same drainage area as the original project. The Department shall identify priority areas in which projects can be completed. Provisions for off -site work in lieu of full on -site retention may be made only for redevelopment projects. 8.7 Retention Waiver 8.7.1 The requirement for retention may be waived in its entirety only in the following instances: 1. The site has been classified as contaminated; 2. Contamination has been capped in place; 3. An Activity and Use Limitation (AUL) precludes infiltrating runoff to the groundwater pursuant to Massachusetts General Law, Chapter 21 E and the Massachusetts Contingency Plan, 310 CMR 40; 4. The site contains a solid waste landfill as defined in 310 CMR 19; or 5. Groundwater from the recharge area flows directly towards a solid waste or 2 1 E site. 8.7.2 Where a recharge waiver is granted, the Department of Public Works may require other BMPs, such as detention systems, to provide temporary storage of stormwater runoff to reduce peak flows in the drainage system. 9.0 Stormwater Management and Erosion Control — Technical Requirements Stormwater management systems shall be designed in accordance with the Massachusetts Stormwater Management Standards (except as stricter regulations outlined herein apply), regardless of the size of the development and whether or not it falls within the jurisdiction of the Massachusetts Wetlands Protection Act. Approved and Adopted Page 19 of 32 9.1 Precipitation Data: Unless specified, all design storms shall have a 24-hour duration and all drainage analyses shall use the following precipitation data, adopted from the web tool "Extreme Precipitation in New York and New England" developed jointly by the Northeast Regional Climate Center (NRCC) at Cornell University and the Natural Resources Conservation Service (MRCS), as available at http://precip.eas.comell.edu/ for the Town of Watertown centered at Department of Public Works, 124 Orchard Street, as accessed on July 15, 2014 and summarized in the table below: Design Storm 24-Hour Precipitation (Inches) 2-year 3.2 10-year 4.9 25-year 6.2 100-year 8.9 9.2 Hydrologicalysis Methodology: Existing and proposed stonnwater runoff peal',rates and total volumes shall be estimated using the methods described in Technical Release No. 20 (TR-20) and Technical Release No. 55 (TR-55), where applicable, published by the National Resources Conservation Service (MRCS), United States Department of Agriculture (USDA). 9.2.1 Common design point(s) shall be used for comparison between existing and proposed conditions. 9.2.2 The total length of "sheet flow" in the calculation of Time of Concentration for a subcatchment shall be limited to 100 feet or less for pre -developed conditions, and 50 feet or less for post -developed conditions. The minimum permissible Time of Concentration is 5.0 minutes. 9.2.3 The surface of all ponds, rivers, detention/retention ponds, and other waterbodies shall be assumed to be impervious for the purpose of calculating ground cover. 9.2.4 For purposes of computing runoff, all pervious lands in the site prior to the development shall be assumed to be in good condition regardless of conditions existing at the time of computation. 9.2.5 Stormwater analyses shall be performed using an NRCS (formerly Soil Conservation Service — SCS) Type III 24-hour rainfall distribution. The use of computer modeling techniques, such as HydroCAD, is strongly preferred. 9.2.6 For computer models that have the ability to adjust the time period of the storm analysis, the storm shall be analyzed from time 0.0 (the start of the storm) to at least 30 hours after the start of the storm event. The time increment between analysis points shall be 0.02 hours. 9.2.7 The size of the overall drainage area analyzed in the pre -development and post - development analyses shall be the same. 9.3 Closed Drainage System: LID practices are encouraged when feasible. Where closed drainage networks are proposed, calculations shall be provided in accordance with the following requirements: 9.3.1 Design Storms: The proposed drainage system shall be designed to accommodate a 25-year design storm. Bridges and culverts shall be designed for a 50-year Approved and Adopted Page 20 of 32 design storm, with consideration being given to avoiding damage during a 100- year design storm. Stormwater BMPs for peak rate and volume control shall be designed for 2-, 10-, 25-, and 100-year design storms, in accordance with the Performance Standards of Section 8.0. The effects of bypass (i.e., stormwater flow which bypasses a catch basin when the inflow capacity of the catch basin is exceeded) and tailwater shall be accounted for in the design of these BMPs. 9.3.2 Design Methodology: The Rational Method shall be used to determine peak flows of runoff for the design of the closed drainage system. The Rational Method cannot be used to determine runoff volumes. The Manning Formula shall be used for the sizing of drain pipe and other drainage conveyance swales. A worksheet similar to that provided in Exhibit 8-49 of the Massachusetts Highway Department (MHD) Project Development and Design Guide (2006 edition) shall be provided for the design of each closed drainage network. The effect of tailwater conditions at the end of the drainage system shall be taken into account. Documentation shall be provided to show how tailwater elevations were obtained for the respective design storms. 9.3.3 Catch Basins: In general, catch basins shall be required on both sides of roadways at intervals of not more than 300 feet, at all low points in grade, near the corners of roadways at intersecting streets, and at all other locations as required by the Department of Public Works. Catch basins are not allowed in front of driveway openings. Catch basin -to -catch basin connections are not allowed (including landscape area drain -to -catch basin connections). Each catch basin shall be connected to a manhole. All catch basins shall have a minimum four -foot sump and a floatables control hood on the outlet pipe. All grate openings shall be of a design and placement that will not trap or divert bicycle wheels. Catch basins shall be designed such that the grate capacity of each is not exceeded; double catch basin grates and curb inlets may be used as needed. No catch basin which collects runoff from roadways shall be designed to infiltrate stormwater runoff without providing pre-treatment in accordance with the Massachusetts Stormwater Management Standards. 9.3.4 Drain Pipe: All drain pipes shall be laid in a straight line and grade. A manhole shall be provided at every change in pipe size, material, direction, and/or grade. In no case shall drain manholes be spaced at a distance greater than 300 feet. Pipes shall be designed to operate without building up hydraulic pressure head under design flow conditions. The minimum allowable full flow pipe velocity shall be 3 feet per second (fps) when flowing at a depth of approximately one-third of the pipe diameter. The maximum allowable full flow pipe velocity shall be 10 fps. 9.3.5 Drain Pipe Materials: Drain pipes shall be either reinforced concrete pipe (RCP) or high -density polyethylene pipe (HDPE). Ductile iron pipe shall be used in areas with less than two feet of cover. 9.3.6 Outfall Protection: Pipe inlets or outfalls with a diameter of 15 inches or greater shall be fitted with a protective barrier, suitable in the opinion of the Department of Public Works, to prevent access by children. Said barrier shall be removable for maintenance purposes. Masonry headwalls and flared end -sections shall be installed, as approved by the Department of Public Works, to prevent erosion. Ground surfaces at all drainage outfalls shall be stabilized with rip -rap or other Approved and Adopted Page 21 of 32 means to prevent erosion from stormwater flows up to the design capacity of the discharging conveyance. Design calculations for rip -rap splash pads or other proposed outfall protection may be required at the discretion of the Department of Public Works. 9.4 Stormwater Infiltration System Design and Calculations: All stormwater infiltration systems shall be designed in accordance with the design standards listed in Volume 3 of the Massachusetts Stormwater Management Standards, except as modified herein: 9.4.1 Documentation of Soil Conditions and Estimated Seasonal High Groundwater: For all projects proposing infiltration BMPs, the Applicant shall provide documentation of the soil conditions and seasonal high groundwater conditions at the proposed site of the infiltration facility or facilities. At a minimum, existing Estimated Seasonal High Groundwater (ESHGW) elevation shall be documented at each location where an infiltration -type stormwater management practice is proposed. The soils on -site shall be classified according to the NRCS Hydrologic Soil Groups (HSG), and a soil textural analysis consistent with USDA methodologies shall be conducted where the HSG classification is inconclusive. Seasonal high groundwater shall be estimated based on redoximorphic features in the soil or, ideally, based on monitoring well observations taken in April or May, when groundwater is typically at its highest levels. 9.4.2 Storage Volume Sizing: the static, simple dynamic, or dynamic field methods shall be used to estimate sizing. The use of the Rational Method to size infiltration systems is strictly prohibited. 9.4.3 Infiltration Rates: When the static or simple dynamic methods are used, the infiltration rate for each system shall be estimated based on the rates specified by Rawls et al. 1982. For the "dynamic field" method, saturated hydraulic conductivity rates shall be determined at the actual location and soil layer (i.e., elevation) where infiltration is proposed. A Title 5 percolation test does not provide an acceptable estimate of the infiltration rate on the site using any of the three design methods. The Applicant also shall identify the depth to bedrock or other restrictive layer in the vicinity of proposed infiltration systems. Compaction of soils in designated infiltration areas shall be minimized during and after construction. 9.4.4 Groundwater Separation: 1. The bottom of stormwater infiltration systems shall be a minimum of 2 feet above the estimated seasonal high groundwater elevation. 2. Where a project proposes to attenuate the peals discharge from a 10-year, 24-hour design storm or higher, the bottom of the infiltration system shall be a minimum of 4 feet above the estimated seasonal high groundwater elevation. 3. A groundwater mounding analysis may be required, at the discretion of the Department of Public Works, to ensure that the infiltration system will not cause groundwater to break out above land surface, seep into basements of nearby buildings, or cause other problems. All infiltration systems shall be designed to drain within 72 hours. Approved and Adopted Page 22 of 32 4. At the discretion of the Department of Public Works these requirements may be waived. 9.5 Detention/Retention Basins: Detention/retention basins shall be designed to have a minimum of 1 foot of freeboard during the 100-year design storm. The volume of sediment forebays (if applicable) shall not be counted towards the storage volume of the detention/retention basin. For design purposes, it shall be assumed that there will be no infiltration of stormwater within the drainage basin unless the basin is designed as an infiltration basin in accordance with the Massachusetts Stormwater Management Standards. Detention/retention basins and associated forebays shall be required to drain with 72 hours. Basins shall be designed with an emergency overflow device, such as a weir, to safely pass the 100-year design storm to prevent overtopping and potential erosion of the berm, assuming the primary outlet is not functioning. The bottom of any sediment forebay shall be constructed of concrete or grass that may be mowed, for ease of maintenance; a rip -rap base shall not be allowed. Depending on the depth and size of the basin, the Department of Public Works may require fencing or other effective measures to be installed to prevent unauthorized persons and vehicles from entering the basin. The Department of Public Works also may require landscaping, consisting of evergreen trees and native shrubs, in the area surrounding the basin as a method of screening. 9.6 Maintenance Access: Adequate access shall be provided to all BMPs. Where such facilities are not located on property under ownership of the Permittee, an easement shall be obtained to provide adequate access to the BMP. A maintenance access driveway of 10 feet minimum width and 12 percent maximum slope shall be provided to any outlet control structure. Subsurface BMPs must be provided with easily accessible clean -outs and inspection ports. 9.7 Routing of Overflows: The site shall be designed to ensure that all stormwater runoff from the site up to the maximum design storm for the particular structure or BMP will actually enter the control structure. For example, the control structure may be designed for the 100-year design storm, while the closed drainage system connecting to that structure may be designed to convey only the 25-year design storm, with larger events flooding the system and traveling overland. This overland flow, or overflow, must be directed into the peak control structure; any bypass flow shall be accounted for in the hydraulic estimates for the project. 9.8 Connection to the MS4: Direct connections to the MS4 shall be avoided. If such a connection is proposed, the Applicant must provide an analysis to demonstrate that the closed drainage system can accept the proposed stormwater runoff (both peak rate and volume). If the capacity of the MS4 is not adequate to accommodate the entire proposed amount, then only that portion thereof which can be adequately accommodated shall be connected and/or the Applicant shall be required to improve the downstream system to provide adequate capacity. Connections to the MS4 shall occur at a manhole. If no manhole exists at the point of connection, one shall be installed. Approved and Adopted Page 23 of 32 9.9 Drainage Easements: It shall be the responsibility of the Applicant to make any necessary agreements/easements with any abutter(s) where any aspect of the proposed stormwater management system is to be conveyed beyond the boundaries of the site. Such agreements/easements shall be presented to the Department of Public Works, in recordable form, prior to issuance of the Stormwater Management and Erosion Control Permit. The Applicant is responsible for recording the easements. 9.10 Water Quality: The use of retention or biofiltration shall be the preferred method of water quality treatment for the purpose of meeting Standard 4 of the Massachusetts Stormwater Management Policy. If proprietary manufactured stormwater treatment separators are proposed, the Standard Method shall be used to estimate the required water quality volume, in accordance with the policy published by Massachusetts Department of Environmental Protection (MassDEP), dated September 10, 2013, as amended. 9.11 Erosion Control: The Erosion and Sediment Control Guidelines for Urban and Suburban Areas, published by the MassDEP, originally dated March 1997, as amended, shall be used as the technical reference guide for the implementation of plans to control construction -related impacts, including erosion, sedimentation, and other pollutant sources during construction and land disturbance activities. 10.0 Construction Inspections 10.1 Notice of Construction Commencement The Permittee must notify the Department of Public Works at least 14 days prior to the commencement of construction. In addition, the Permittee must notify the Department of Public Works a minimum of 14 days in advance of construction of critical components of any stormwater management facility or BMP. 10.2 The Department of Public Works shall inspect the project site at the following stages, at a minimum: 1. Initial Site Inspection: prior to approval of any plan; 2. Erosion Control Inspection: An inspection to ensure that erosion control practices are in accordance with the approved Erosion and Sediment Control Plan. Such inspection must be made prior to commencement of any earth moving activity; 3. Completion of site clearing; 4. Close of the construction season; 5. Stormwater Management System Inspection: An inspection will be made of the completed stormwater management system, prior to backfilling of any underground drainage or stormwater conveyance structures; and Approved and Adopted Page 24 of 32 6. Final Inspection: After completion of all work and stabilization of all soils, the Department of Public Works or an authorized agent shall perform an inspection of the system. 10.3 Inadequacy of System 10.3.1 If any component of the erosion and sediment control measures or stormwater management system is found to be inadequate by virtue of physical evidence of operational failure, including evidence of erosion or sedimentation on adjacent properties, rights -of -ways, the MS4, wetland, or watercourse, even if it was built in accordance with the approved Stormwater Management Plan, it shall be corrected by the Permittee. Failure of the Permittee to take corrective action shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 6.0 of the Ordinance. 10.3.2 Any activity that fails to comply with the conditions of the approved Erosion and Sediment Control Plan shall be considered a violation of these Rules and Regulations and subject to enforcement action in accordance with Section 6.0 of the Ordinance. 11.0 As -built Plan Requirements 11.1 No later than one year following completion of work, the Permittee, or its agent, shall submit to the Department of Public Works a final As -built Plan showing the actual as -built location and profile of all streets, ways, and utilities, including those installed by others, such as the gas, electric, telephone, and cable companies. The final plan must, at a minimum, contain the following information. The Department of Public Works may require the inclusion of additional information not set forth herein when deemed reasonably necessary. At a minimum, the following shall be included: • Name, seal, and signature of the Surveyor who performed the survey; • Date(s) of the survey; • Reference to the approved site plan, if any, including information regarding whether the plan is on record at the Middlesex South County Registry of Deeds or Land Court; • All streets, ways, and utilities, including those installed by others; • Rim elevation, location, size, length, slope type, and inverts for all drainage and sewer structures and pipes, including roof drains; • Location, size, and type of all structural BMPs, including, where applicable, the number and bottom elevation of infiltration units or stormwater storage chambers; the bottom elevation depth, length, and width of crushed stone surrounding underground infiltration systems; location of all clean -outs; the actual dimensions of any inlet/outlet control structures, and the invert elevation, size, slope, and type of all orifices, weirs, inlet and outlet pipes, structures, and headwalls; • Final, stabilized site topography, at a minimum of one -foot contour intervals. Approved and Adopted Page 25 of 32 • Location and topography at one -foot contour intervals for all surface retention/detention basins, drainage swales, or other stormwater management facilities. Additional spot grades should be provided as appropriate to confirm that the systems are constructed as designed. The invert elevation, size, and type of all orifices, weirs, inlet and outlet pipes, headwall structures, and emergency spillways also shall be provided, as well as the actual dimensions for any inlet/outlet control structures; • Location of all buildings, structures, pervious and impervious surfaces, roads, driveways, sidewalks, patios, walls, fences, trees, and other significant landscaping features; • Curbing type; and • Any other features that are deemed required to ensure compliance with any conditions imposed by the Department of Public Works. 11.2 Certification: All As -built Plans shall contain the following statement: "I certify, based on field verification, that this set of as -built plans accurately reflects the conditions as they exist on the property. I further certify that the development has been constructed substantially in accordance with the approved Stormwater Management Plan and meets the requirements of the Stoimwater Management and Erosion Control Permit." This certification shall be accompanied by the signature and stamp of an Engineer and a Surveyor. 11.3 Electronic copies of all As -built Plans, in addition to paper copies, are required. 12.0 Simplified Permits In accordance with Section 1.4 of the Stormwater Management and Erosion Control Ordinance, the following activities (if subject to permitting requirements under Section 1.2 of the Ordinance) shall be eligible for Simplified Permits. The Simplified Permit Application procedure shall be in accordance with Section 6.0 of these Rules and Regulations, except as modified below. 12.1 Raised Decks 12.1.1 Eligibility Construction of a raised deck associated with an existing single- or two-family house. 12.1.2 Performance Standards 1. The ground area beneath the proposed deck shall not be paved or otherwise impervious if it is presently bare ground or landscaped, including lawn. 2. If the ground area is presently paved or impervious, it may remain so after construction of the deck and will still qualify for a Simplified Permit. 3. There shall be no roof constructed over the proposed deck. Should a roof be constructed over the deck in the future, a full permit will be required. 4. The proposed deck shall be constructed in such a manner to allow rainfall to pass through to the ground below. An example of this is the typical wooden deck with Approved and Adopted Page 26 of 32 expansion spaces between the boards that form the deck surface. 12.1.3 Permitting Requirements Plan showing the location of the deck and a description of surface and construction materials to demonstrate compliance with the performance standards in Section 12.1.2. 12.2 Patios 12.2.1 Eligibility Construction of a patio associated with an existing single- or two-family house. 12.2.2 Performance Standards 1. The patio shall be constructed of brick, stone, or other materials in such a fashion to permit infiltration of rainfall to the soil below. 2. The patio surface shall not create a concentrated runoff discharge point for stormwater that is not infiltrated through the surface. Stormwater runoff must flow evenly off the edge(s) of the patio. 12.2.3 Permitting Requirements Plan showing the location of the patio and direction of stormwater runoff flow to demonstrate that stormwater runoff will not create concentrated discharge. 12.3 Swimming Pools 12.3.1 Eligibility Construction of a swimming pool associated with an existing single- or two-family house. 12.3.2 Performance Standards Prior to draining, the pool water shall meet the requirements of Section 97.07(a) of the Town of Watertown Code of Ordinances. 12.3.3 Permitting Requirements Plan showing the location of the pool, including accessory structures, such as decks and sidewalks. The plan should address discharge of water from the pool. Approved and Adopted Page 27 of 32 12.4 Driveway Expansion 12.4.1 Eligibility 1. Expansion of an existing driveway for an existing single- or two-family house; 2. The location has been approved by the Zoning Enforcement Officer; 3. No Stormwater Management and Erosion Control Permit or Simplified Permit for Driveway Expansion has been issued previously; and 4. No direct connections to the MS4 are present or proposed. 12.4.2 Performance Standards 1. The use of brick, stone, pervious pavers, or other materials has been considered to permit infiltration of rainfall. 2. The driveway shall not create a concentrated runoff discharge point. The expanded area shall flow to a pervious (e.g., grass, landscaping, etc.) surface. 3. Expansion of the driveway surface shall not result in additional stormwater runoff flowing to the MS4. 4. Sand shall not be used as a de-icing material on the driveway. 12.4.3 Permitting Requirements 1. Plan showing the location of the existing driveway, proposed expansion, and direction of stormwater runoff flow to demonstrate that stormwater runoff will not create concentrated discharge. 2. Area calculation of existing and proposed driveway surface area. 12.5 Residential Construction 12.5.1 Eligibility 1. Construction of a new single- or two-family residence, including demolition of an existing structure and construction of a new structure on the same lot; 2. Proposed work is not located in a resource area protected by the Massachusetts Wetlands Protection Act or the Watertown Wetlands Ordinance; and 3. No direct connections to the MS4 are proposed. 12.5.2 Performance Standards 1. All roof runoff shall be conveyed to a system of drywells or an infiltration system. 2. Driveways shall be graded to flow towards pervious areas. 3. Appropriate erosion and sediment controls are provided. 4. Sand shall not be used as a de-icing material on the driveway. Approved and Adopted Page 28 of 32 12.5.3 Permitting Requirements 1. Design Standards • Documentation of soil conditions and estimated seasonal high groundwater must be performed prior to submission of the permit application. • At the discretion of the Department of Public Works, documentation of soil conditions and estimated seasonal high groundwater prior to submission of the permit application may be waived provided such documentation is obtained in conjunction with building demolition or other initial land disturbance activities. In the event that the actual soil conditions vary from those assumed during engineering design of the infiltration system, the Applicant shall redesign the system to account for the observed soil conditions. The redesign shall be reviewed and approved by the Department prior to installation. • Abbreviated stormwater calculations: The Applicant shall utilize the design methodology described in Section 9.0 of these Rules and Regulations. Stormwater calculations shall be provided for the 100-year design storm. The drainage area shall comprise the total impervious area of the proposed building footprint. No deduction shall be made for existing conditions. A hydrograph shall be generated and hydraulically routed through the proposed infiltration system. Calculations shall demonstrate that no overflow occurs during the 100-year design storm. 2. Abbreviated Stormwater Management Report: • Include a copy of the soil conditions, including Hydrologic Soils Group (HSG) classification published by the National Resources Conservation Service (MRCS). • Include documentation of soil conditions and seasonal high groundwater. • Include calculations meeting the technical requirements of Section 9.0 are provided for the existing and proposed conditions for the 100-year design storm, demonstrating no overflow of the infiltration system. • Include an Operations and Maintenance Plan. 3. The requirements of Sections 7.1, 7.2, 7.3, and 7.4 may be met on a single 24" x 36" sheet. 4. The As -built Plan requirements of Section 11.0 are a condition of the Simplified Permit. 12.6 Driveway and Parking Lot Reclamation or Overlay with Direct Connection to MS4 12.6.1 Eligibility 1. Existing closed drainage system with connection to the MS4. Approved and Adopted Page 29 of 32 2. No increase in impervious area or modification to the drainage system, except if required to meet the performance standards of the Simplified Permit. 12.6.2 Performance Standards 1. The drainage system provides 80% removal of the average annual load of Total Suspended Solids, in accordance with Standard 4 of the Massachusetts Stormwater Management Standards. If the existing drainage system does not meet the performance standard, then additional water quality controls shall be installed to meet the standard. 2. Appropriate erosion and sediment controls are provided during the paving process. 12.6.3 Permitting Requirements 1. An As -built Plan shall be submitted demonstrating compliance with the performance standards. 2. If additional work is required to meet the TSS removal performance standard, then documentation of proposed work, including TSS removal calculations, shall be provided. 3. Proposed erosion controls shall be noted on plan or narrative. 4. An Operations and Maintenance Plan, if not already in place, shall be implemented. 12.7 Driveway and Parking Lot Reclamation or Overlay with Sheet Flow to MS4 12.7.1 Eligibility 1. There is no direct connection to the MS4, but surface runoff is directed to the MS4 by means of sheet flow. 2. There is no increase in impervious area or modification to the stormwater management system or MS4, except if required to meet the performance standards of the Simplified Permit. 12.7.2 Performance Standards 1. The Applicant shall take steps to provide increased water quality treatment of stormwater runoff prior to discharge to the MS4. Examples include, but are not limited to, providing vegetated filter strips, rain gardens, or reducing overall impervious area. The installation of a closed drainage or treatment system is expressly not required. 2. Appropriate erosion and sediment controls are provided during the paving process. 12.7.3 Permitting Requirements 1. Plan of parking lot showing existing and proposed pavement limits and noting proposed improvements. Approved and Adopted Page 30 of 32 2. Proposed erosion controls shall be noted on plan or narrative. 13.0 Waivers The Department of Public Works may waive strict compliance with any requirement of these Rules and Regulations where: • Such action is allowed by federal, state, and other local statutes and/or regulations; • Such action is in the public interest; • Such action is not inconsistent with the purpose and intent of these Rules and Regulations and the Stormwater Management and Erosion Control Ordinance; and • Meeting the minimum on -site management requirements is not feasible due to the natural or existing physical characteristics. Any Applicant may submit a written request to be granted such a waiver. Such a request shall be accompanied by an explanation or documentation supporting the waiver request and demonstrating that strict application of the Stormwater Management and Erosion Control Ordinance and these Rules and Regulations does not further the purposes or objectives of the Ordinance and these Rules and Regulations. The Department of Public Works will provide a written statement of its findings and the reasons for granting or denying a waiver. 14.0 Severability The invalidity of any section, provision, paragraph, sentence, or clause of these Rules and Regulations shall not invalidate any other section, provision, paragraph, sentence, or clause thereof, nor shall it invalidate any permit determination that has been previously issued. Approved and Adopted Page 31 of 32 DPW Site Plan Number: TOWN OF WATERTOWN, MASSACHUSETTS DEPARTMENT OF PUBLIC WORKS STORMWATER MANAGEMENT AND EROSION CONTROL PERMIT APPLICATION Please fill out in full. Incomplete forms will be rejected. Property address: (number) (Street) (Assessor's Info) Owner: (name) (address) (phone) Applicant: (name) (address) (phone) Engineer/Surveyor: (name) (address) (phone) Primary Contact: (name) (phone) (e-mail) Stormwater Management and Erosion Control Permit criteria The proposed project will have the following impacts (check all that apply): o New single family residential construction O New two-family residential construction or residential addition with new unit O New commercial or multi -unit residential construction o Net increase in site impervious surface area by more than 500 square feet o Land disturbance of 5,000 square feet of total area or more (includes driveway and parking lot excavation, reclamation, milling) O Land disturbance of 1 acre or greater (If YES, project additionally requires USEPA Construction General Permit) O Preliminary site investigation activities that will be part of a larger common development plan that will disturb 5,000 square feet of total area or more O Create or modify a direct connection to the MS4 (Town of Watertown Stormwater system) If any of the above criteria is checked, the project requires a Stormwater Management and Erosion Control Permit. A Stormwater Management and Erosion Control Permit does not constitute Zoning approval or a Building Permit. Applicant is hereby advised to consult with other Town Departments to determine if other permits are required. April 2019 Page 1 of 1 TOWN OF WATERTOWN, MASSACHUSETTS DEPARTMENT OF PUBLIC WORKS As -Built Requirements Instructions: Submit As -Built Plans certified by the Engineer and the Professional Land Surveyor (PLS) for DPW sign off required for occupancy permitting. One 24"x 36" plot and one electronic copy (PDF) shall be provided to Department of Public Works for review. DPW requires minimum 10-days to review As -Built plans prior to acceptance. As -Built Plans to include the following information: 1. DPW Site Plan No.; 2. Name, seal, and signature of the Surveyor who performed the survey; 3. Date(s) of the survey; 4. Certification statement from Engineer stating, "I certify, based on field verification, that this set of as -built plans accurately reflects the conditions as they exist on the property. I further certify that the development has been constructed substantially in accordance with the approved Stormwater Management Plan and meets the requirements of the Stormwater Management and Erosion Control Permit." 5. Location of all buildings, structures, pervious and impervious surfaces, roads, driveways, sidewalks, curbing, patios, walls, fences, trees, and other significant landscaping features; 6. Locations of any other features that are deemed required to ensure compliance with any conditions imposed by the Department of Public Works; 7. Rim elevation, location, size, length, slope, and inverts for all drainage and sewer structures and pipes, including roof drains; 8. Indicate size and type of all water piping; 9. Location, size, and type of all structural BMPs, including, where applicable, the number and bottom elevation of infiltration units or stormwater storage chambers; the bottom elevation depth, length, and width of crushed stone surrounding underground infiltration systems; location of all clean -outs; the actual dimensions of any inlet/outlet control structures, and the invert elevation, size, slope, and type of all orifices, weirs, inlet and outlet pipes, structures, and headwalls; 10. Final, stabilized site topography, at a minimum of one -foot contour intervals; 11. Location and topography at one -foot contour intervals for all surface retention/detention basins, drainage swales, or other stormwater management facilities. Additional spot grades should be provided as appropriate to confirm that the systems are constructed as designed. The invert elevation, size, and type of all orifices, weirs, inlet and outlet pipes, headwall structures, and emergency spillways also shall be provided, as well as the actual dimensions for any inlet/outlet control structures; 12. Swing ties to cut and cap of existing water service(s) at the main and new connections, including all installed corporations, curb stops, gates, hydrants, bends, and connections to main; 13. Swing ties to cut and cap of existing sewer service(s) at the main, new connections, fittings, etc.; and 14. Swing ties to installed infiltration system access port(s). For questions, contact: Matthew I. Shuman, P.E. Town Engineer E-mail: mshuman@watertown-ma.gov April 2019 Page 1 of 1 DPW Site Plan Number: TOWN OF WATERTOWN, MASSACHUSETTS DEPARTMENT OF PUBLIC WORKS SITE PLAN REVIEW CHECKLIST for SINGLE and TWO-FAMILY CONSTRUCTION Please fill out in full. Incomplete forms will be rejected. Property address: (number) (Street) (Assessor's Info) Owner: (name) (address) (phone) Applicant: (name) (address) (phone) Engineer/Surveyor: (name) (address) (phone) Primary Contact: (name) (phone/fax) (e-mail) Instructions: This Site Plan Review Checklist shall be completed by the Engineer/Surveyor and submitted with each DPW site plan review application. Applicants shall provide all supporting documentation with each submittal. Please select all applicable items by checking "Yes" or "No". If item is "Not Required (NR)" or "Not Applicable (NA)" record in comment section with explanation. Explanations may be submitted on separate sheets if needed. Item Description of • .Comments General: 1 Original signed, dated, and stamped site plan by PE and PLS 2 Use 24"x36" sheet at scale 1"=10' or 1"=20' with North Arrow 3 Separate existing and proposed conditions plans (may be on same sheet) 4 Site topography with F contour intervals for existing conditions in addition to supplemental spot grades (include reference datum and benchmark information) 5 Provide complete survey (entire Right of Way) along frontage and/or Limit(s) of Work 6 Property lines (Bearings and Distances) certified by PLS 7 Owner and Abutter's information (Now or Formerly) 8 Lot size (square feet) and Assessor's Block and Lot information 9 Proposed Street Sideline, curb and gutter grades 10 Existing and finish grades of the site (incl. spot grades at foundation) 11 Location and dimensions of driveway(s),curb cuts, parking areas 12 Name and widths of abutting streets and ways (public and private) 13 All easements (public and/or private) with desc. of restrictions, if any 14 All public sidewalks and curbing (label width and type) 15 Location and size of public and private trees or statement of none 16 Building foundation location, dimensions, and elevations (finished floor, basement, and below grade parking) 17 Entrances to all units are clearly visible from front of property for addressing purposes; indicate proposed addresses April 2019 Page 1 of 3 DescriptionItem of •Comments 18 Reference to flood zone based on Flood Insurance Rate Map 19 Existing and proposed impervious area (square feet) noted on plan 20 Standard notes included on plan (see Page 3) Water and Sewer Mains and Services: 1 Location, size, and type of existing and proposed mains, services, and structures 2 For two-family residences, separate water services are provided 3 For two-family residences, separate sewer services are provided (may discharge to a common manhole) 4 10' offset water (domestic and fire) from sanitary sewer; 5' offset for all other utilities 5 Distance shown from existing manhole for new sewer connections 6 Curb stops located a minimum of 18-inches before property line 7 Include profile of proposed sewer services from the house to the main (show length, slope (minimum 2% / maximum 6%), invert elevation at both ends, and utility crossings) 8 Location and type of fittings, bends, restraints, backflow devices, and meters (show location of meter at "point of entry" in the building) 9 Water service connection detail, showing 5-foot minimum burial depth for water service, corporation at main, 1-inch Type K copper pipe 10 Sewer service connection detail is provided, showing method of connection (core or install new tee-wye) 11 Sewer pipe is 6-inch minimum diameter SDR-35 pipe, installed in a bed of 3/a-inch stone Drainage and Stormwater Management: 1 All runoff from all impervious surfaces directed to an infiltration system for design storm with no overflow 2 Computations signed and stamped by a registered P.E. to support stormwater management design, based upon a design storm of 8.9- inches of precipitation in 24-hours (i.e., a 100-year, 24-hour, Type III Rainfall, as defined by the U.S. Soil Conservation Service) 3 Test pit showing sub -surface soil conditions and estimated seasonal high groundwater noted on plan 4 Infiltration system designed using the Static, Simple Dynamic, or Dynamic Field method 5 If saturated hydraulic conductivity testing has not been performed, the Rahl's rate has been used 6 Report including soils map and test pit information, input data, hydrographs, and hydraulic routing information, and summary table 7 Includes calculation estimating exfiltration rate from drywells and dewatering time 8 Catch basins and trench drains have 4-foot sumps and hoods 9 Location, size, and type of stormwater management structures shown on plan. All devices a minimum of 5-feet from property lines (10-feet preferred) 10 Erosion controls shown on plan; i.e., hay bales and silt fence, catch basin protection 11 Stormwater management construction details provided, including dimensions and inverts of all drywells/infiltration systems April 2019 Page 2 of 3 DescriptionItem of Comments 12 Operation and Maintenance Plan provided Highway: 1 Upgrades to sidewalk and curbing, in accordance with Chapter 55 of the Town Ordinances (VA-4 curbing along frontage with 2-foot Type A corner blocks at driveways and concrete sidewalks) 2 Proposed driveway opening widths are noted. Widths must be in accordance with Zoning requirements 3 Trench patch locations are shown 4 All castings a minimum of 2-feet from property line 5 Tree protection detail for work around public shade trees Standard notes to be included on all site plans: Highway 1. Concrete mix: 4,000 psi concrete, 3/4-inch stone, 2 'h-lbs lampblack per cubic yard. 2. Asphalt patches shall have a minimum depth of 5-inches, or match existing road depth. 3. All curbing and sidewalk work shall be inspected by the DPW prior to pouring. 4. All work shall comply with ADA requirements. 5. Flowable fill required as backfill in the public way. Water and Sewer 6. Cut and cap existing water and sewer services at the main prior to any building demolition. 7. Use of fire hydrants for demolition or construction is not permitted unless approved beforehand by the Department of Public Works. 8. Water pipes shall be installed at a minimum depth of 5-feet. 9. A minimum separation of 5-feet is required between all utilities. Drainage and Stormwater Mana eg ment 10. All erosion and sediment controls shall be installed and inspected by DPW prior to commencement of any earth moving activities. 11. The Engineer -of -record shall witness installation of any sub -surface infiltration system. If sub -surface soil conditions differ from that shown on the plan, the design shall be modified and resubmitted to the Town for approval prior to continuing installation. As -built 12. Upon completion of the work, as -built drawings shall be submitted in both paper and electronic format. The drawings shall be based upon a field survey of actual as -built locations, and shall be stamped by a Professional Land Surveyor registered in the Commonwealth of Massachusetts. The as -built drawing shall depict all buildings, paved surfaces, topography, and major landscape features. Water, sewer, and drainage features, as well as other underground utilities installed by others, shall be located on the plan, including size and material. All stormwater management controls, both structural and non-structural, designed to manage the stormwater associated with the completed site shall also be included. For questions, contact: Matthew I. Shuman, P.E. Town Engineer E-mail: mshuman@watertown-ma.gov April 2019 Page 3 of 3 Gerald S. Mee Jr. Superintendent TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS (P) 617-972-6420 124 ORCHARD STREET (F) 617-972-6402 WATERTOWN MA 02472 Water Quality Retrofit Requirements for Parking Lots Per the Town's Code of Ordinances, Section 98.01(B), a Stormwater Management and Erosion Control Permit is required for any activity that will result in land disturbances of 5,000 square feet of total area or more, or smaller activities that are part of a larger common development plan that will disturb 5,000 square feet or more. Projects that simply overlay existing pavements are exempted from this requirement, provided there is no increase in impervious area. Projects that include excavation, reclamation, or pavement milling and are 5, 000 square feet in area or greater require a Stormwater Management and Erosion Control Permit. If the project site / pavement area contains a stormwater management (drainage) system, such as catch basins, which discharge to the Town's drainage system, then water quality treatment must be provided before the point(s) of connection with the Town's system. • The drainage system must provide 80% removal of the average annual load of Total Suspended Solids, in accordance with Standard 4 of the Massachusetts Stormwater Management Standards. If the existing drainage system does not meet the performance standard, then additional water quality controls shall be installed to meet the standard. • Appropriate erosion and sediment controls are provided during reclamation, grading, and paving. • If additional work is required to meet the TSS removal performance standard, then documentation of proposed work, including TSS removal calculations, shall be provided. • An Operations and Maintenance Plan, if not already in place, shall be implemented. • An As -built Plan shall be submitted demonstrating compliance with the performance standards. If the project site / pavement area does NOT contain a stormwater management (drainage) system and stormwater discharges to the street through sheet / overland flow, then steps shall be taken to provide increased water quality treatment of stormwater runoff prior to discharge to the Town's system. Examples include, but are not limited to, providing vegetated filter strips, rain gardens, or reducing overall impervious area. The installation of a closed drainage or treatment system is expressly not required. Appropriate erosion and sediment controls must be provided during road reclamation, grading, and paving. Consultation with DPW is recommended prior to applying for a Permit. A DPW Street Opening / Paving permit will not be issued until a Stormwater Management and Erosion Control Permit is issued for subject properties. Please consult with various other departments to determine if other permits are required. IAStormwater Ordinance\Driveway Retrofits\Driveway Stormwater Retrofits.doc REV.: 3/14/18 DPW Site Plan Number: TOWN OF WATERTOWN, MASSACHUSETTS DEPARTMENT OF PUBLIC WORKS SITE PLAN REVIEW CHECKLIST for RESIDENTIAL AND COMMERCIAL CONSTRUCTION (except Single Family and Two -Family Construction) Please fill out in full. Incomplete forms will be rejected. Property address: (number) (Street) (Assessor's Info) Owner: (name) (address) (phone) Applicant: (name) (address) (phone) Engineer/Surveyor: (name) (address) (phone) Primary Contact: (name) (phone/fax) (e-mail) Instructions: This Site Plan Review Checklist shall be completed by the Engineer/Surveyor and submitted with each DPW site plan review application. Applicants shall provide all supporting documentation with each submittal. Please select all applicable items by checking "Yes" or "No". If item is "Not Required (NR)" or "Not Applicable (NA)" record in comment section with explanation. Explanations may be submitted on separate sheets if needed. Checklist: DescriptionItcm of Site Plan Requirement "Yes "No" Comments General: 1 Original signed, dated, and stamped site plan(s). All plans shall be stamped by Commonwealth of Massachusetts registered Professional Engineer, Professional Land Surveyor, or Landscape Architect. 2 Electronic pdf of all plans 3 Use 24"06" sheets only. Plans to be at scale 1"=40' (or less) with North Arrow indicated. 4 Cover Sheet with: Project Name/Plan Index/Revision Log/Locus Map/Engineer and Owner contact information (name, address, and phone number) 5 Separate existing and proposed conditions plans 6 Survey information including date(s) completed 7 Site topography with F contour intervals for existing conditions in addition to supplemental spot grades (include reference datum and benchmark information) 8 Provide complete survey (entire Right of Way) along frontage and/or Limit(s) of Work 9 Property lines (Bearings and Distances) certified by PLS 10 Owner and Abutter's information (Now or Formerly) 11 Lot size (square feet) and Assessor's Block and Lot information April 2019 Page 1 of 4 DescriptionItem of • 12 Overhead and underground utility information including adequate off -site utility information to verify all proposed utility connections. 13 Test pits performed located on plan(s) including groundwater elevation 14 Legend for existing and proposed plans 15 Proposed Street Sideline, curb and gutter grades 16 Finish grades of the site (incl. spot grades at foundations) 17 Location and dimensions of driveway(s), curb cuts, parking areas 18 Name and widths of abutting streets and ways (public and private) 19 All easements (public and/or private) with desc. of restrictions, if any 20 All public sidewalks and curbing (label width and type) 21 Signage and pavement markings adjacent to site 22 Location and size of public street trees and private trees or statement of none 23 Building foundation location, dimensions, and elevations (finished floor, basement, and below grade parking) 24 Proposed building(s) address indicated Note: Street name used for the official building address will be based on the roadway that the location of the main building entrance is located. 25 Reference to flood zone based on Flood Insurance Rate Map 26 Existing and proposed impervious area (square feet) noted on plan(s) 27 Standard notes included on plan (see Page 4) 28 Subsequent submission of plans shall be clearly noted as such with revision cloud, revision number and revision date shown on the plan(s) 29 Transportation Analysis and Impact Assessment (Coordinate scope of study with DPW and DCDP prior to submission) Water and Sewer Mains and Services: 1 Location, size, and type of existing and proposed mains, services, and structures 2 10' offset water (domestic and fire) from sanitary sewer; 5' offset for all other utilities 3 Distance shown from existing manhole for new sewer connections 4 Curb stops located a minimum of 18-inches before property line 5 Include profile of proposed sewer services from the building to the main (show length, slope (minimum 2% / maximum 6%), invert elevation at both ends, and utility crossings) 6 Location and type of fittings, bends, restraints, backflow devices, and meters (show location of meter at "point of entry" in the building) 7 Water service connection detail, showing 5-foot minimum burial depth for water service, For services 2" or less, corporation at main, 1-inch (min.) Type K copper pipe. For services greater than 2", tapping sleeve at main, gate valve (with valve box and cover), ductile iron pipe class 52 (or greater). 8 Location of building fire department connection(s) 9 Sewer service connection detail is provided, showing method of connection (install new tee-wye) 10 Sewer pipe is 6-inch minimum diameter SDR-35 pipe, installed in a bed of 3/4-inch stone April 2019 Page 2 of 4 DescriptionItem of •Comments Drainage and Stormwater Management: 1 All runoff from all impervious surfaces directed to an infiltration system for design storm with no overflow 2 Computations signed and stamped by a registered P.E. to support stormwater management design, based upon a design storm of 8.9- inches of precipitation in 24-hours (i.e., a 100-year, 24-hour, Type III Rainfall, as defined by the U.S. Soil Conservation Service) 3 Test pit showing sub -surface soil conditions and estimated seasonal high groundwater noted on plan 4 Infiltration system designed using the Static, Simple Dynamic, or Dynamic Field method 5 If saturated hydraulic conductivity testing has not been performed, the Rahl's rate has been used 6 Report including soils map and test pit information, input data, hydrographs, and hydraulic routing information, and summary table 7 Includes calculation estimating exfiltration rate from drywells and dewatering time 8 Catch basins and trench drains have 4-foot sumps and hoods 9 Location, size, and type of stormwater management structures shown on plan. All devices a minimum of 5-feet from property lines (10-feet preferred) 10 Erosion controls shown on plan; i.e., hay bales and silt fence, catch basin protection, etc. 11 Stormwater management construction details provided, including dimensions and inverts of all drywells/infiltration systems 12 Operation and Maintenance Plan provided Highway: 1 Upgrades to sidewalk and curbing, in accordance with Chapter 55 of the Town Ordinances (VA-4 curbing along frontage with 2-foot Type A corner blocks at driveways and concrete sidewalks) 2 Proposed driveway opening widths are noted. Widths must be in accordance with Zoning requirements 3 Trench patch locations are shown 4 All castings a minimum of 2-feet from property line 5 Tree protection detail for work around public shade trees Landscaping: 1 Plan and schedule for all proposed trees and plantings. Street tree sizing and species to be coordinated with Watertown Tree Warden prior to submission. 2 Indicate areas to be locmed and seeded 3 Tree protection detail and indication of trees to be protected on plan 4 Proposed irrigation 5 Identify existing street trees. Street trees must be identified and located on survey plans to be submitted. April 2019 Page 3 of 4 Standard notes to be included on all site plans: General 1. The Contractor must contact the appropriate private utility companies and "DIGSAFE" at least 72-hours prior to any excavation work being completed. The contractor is hereby notified that some public and private utility companies are not part of DIGSAFE and may have additional notification requirements. 2. Any work and material to be placed within the Town right-of-way shall conform to the Town of Watertown requirements. 3. The Contractor shall obtain a street opening permit prior to any construction within the Town right-of-way. 4. Any damage in the Town right-of-way, as a direct or indirect result of the Contractor's operations, shall be repaired by the Contractor at no expense to the Town. Highway 5. Concrete mix: 4,000 psi concrete, 3/4-inch stone, 2 'h-lbs lampblack per cubic yard. 6. Asphalt patches shall have a minimum depth of 5-inches, or match existing road depth. 7. All curbing and sidewalk work shall be inspected by the DPW prior to pouring. 8. All work shall comply with ADA and MAAB requirements. 9. Flowable fill required as backfill in the public way. Water and Sewer 10. Cut and cap existing water and sewer services at the main prior to any building demolition. 11. Use of fire hydrants for demolition or construction is not permitted unless approved beforehand by the Department of Public Works. 12. Water pipes shall be installed at a minimum depth of 5-feet. 13. 10' offset water (domestic and fire) from sanitary sewer. All other utilities require minimum 5-feet separation from other utilities. 14. All gate valves shall "open right". Drainage and Stormwater Management 15. All erosion and sediment controls shall be installed prior to commencement of any earth moving activities. 16. The Contractor shall keep on site, at all times, additional siltation fencing and filter fabric for installation as directed by the Town to mitigate any emergency conditions. 17. The Engineer -of -record shall witness installation of any sub -surface infiltration system. If sub -surface soil conditions differ from that shown on the plan, the design shall be modified and resubmitted to the Town for approval prior to continuing installation. 18. Upon completion of all site work, the Contractor shall inspect all on -site and off -site catch basins (that received catch basin protection) and drainage manholes and remove all sediment and debris that has accumulated during the course of construction. As -built 19. Upon completion of the work, as -built drawings shall be submitted in both paper and electronic format. The drawings shall be based upon a field survey of actual as -built locations, and shall be stamped by a Professional Land Surveyor registered in the Commonwealth of Massachusetts. The as -built drawing shall depict all buildings, paved surfaces, topography, and major landscape features. Water, sewer, and drainage features, as well as other underground utilities installed by others, shall be located on the plan, including size and material. All stormwater management controls, both structural and non-structural, designed to manage the stormwater associated with the completed site shall also be included. For questions, contact: Matthew I. Shuman, P.E. Town Engineer E-mail: mshuman@watertown-ma.gov April 2019 Page 4 of 4 APPENDIX I Standard Operating Procedures westonandsampson.com Weston ®Sampson APPENDIX J 2016 MS4 Annual Reports westonandsampson.com Weston ®Sampson