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Home My Public Portal AboutStormwater Management Update PresentationStormwater Advisory Committee Presentation January 21, 2021 6 "Minimum Control Measures" 1. Public Education 2. Public Involvement 3. Illicit Discharge Detection &Elimination (IDDE) 4. Construction Runoff Control 5. Post -construction Stormwater Management 6. Pollution Prevention Plus TMDL requirements (including Charles River Phosphorus Control Plan) Plan finalized in July 2019 Minor updates were made in September 2020 based on review during Year 2 Annual Report preparation ' Reference additional documents that were prepared ' Reference completed tasks ' Additional interconnection added https://www.watertowndpw.org/162/NPDES-Program Year 2 Activities ' Web -site for public education: https://www.watertowndpw.orb/161/Stormwater-Management Town Manager newsletter Press releases Winter deicing brochure ' Guide to the planting strip ' Automotive brochure mailed to 22 industrial businesses ' Dumpster maintenance brochure for commercial businesses Year 3 Activities ' Continue Year 2 activities ' Increase social media presence ' Provide permitting information to developers/contractors Year 2 Activities 1_ ._ - RAIN GARDENS ' Stormwater Advisory Committee met 6 times 10 150 catch basins stenciled ' 16 rain barrels sold 10 Stormwater tour cancelled due to COVID Year 3 Activities 10 10 Continue Stormwater Advisory Committee meetings, as needed Continue other programs in light of COVID i I . 4 HOUSEHOLD WASTEWATER SANITARY SEWER dill'—il' OPT' 7,� ■ ��; —� �;. ,II. -� � J STORM , -v- 1 DRAINi► CATCH BASIN ,ft WATERWAY https://www.watertowndpw.org/181/Illicit-Discharge-Detection-Elimination- Year 2 Activities Requested permission from EPA to use information from Administrative Order to meet catchment prioritization requirements 10 Requested permission to use current IDDE Plan for compliance with Permit requirements 10 Updated IDDE Plan as needed for consistency with Permit requirements (completed during Year 1) fir !, %242""o tw t .ti llei-3-4 I!, Pm, "l lci-4-3 11a�i-17 r a 7 lla 3L7 - :�-i -15, 'may �' °�� • � - • - -- .s1 V WATERTOWN NN'rm rofftbli=works Year 2 Activities Continued manhole testing in priority outfall areas (6, 8, 11, 18, 20, 99, 109, and 6 E L) Additional investigations in o u tf a I I areas 1, 41 71 91 12, 17, 37, and 38 x ,, A r, �" ;k. r �� ` � g �*,, ,awg - r { '.3.�1� wy� pk- g_ Alper era 4 % „ z by � 'e an xe9 � a.,ry,i kn 4 r. nd r ..I r... a: H.' �F•etq Y 'P r,l �i4lrl CYl j _ a us Y 11yrg'rnl n� qf�� :YIIII.lY4� RIII.J d p' a,l F�+ p lr�Rn ip pU NfM1vn.r Lan 81oaa11 o- �' ild II'�„i. 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Y.i ... 0 0.1]5 035 CFF PS •++�1�` � •• FIGURE r1i�19` Fei.m 'i' .i a'r Aa4 g f „o*-- r Vr IYi1r.LRi IlW^ TOWN OF WATERTOWN, MA r .w Ar .�'I J' y � �C•• N �' .. �I �i�iFn1 r�.N�! � H•�rtn ' P'; I'°III �a 'Qvn�l a„ nor n Fannwl `h. rN +I�r,.,, PRIORITYCATCHMENT AREAS n�hP 7Lrnx S` dp° o �4a 1 ll.il JANLIARY2021 SGALE: NOTED s H�wM 0s` Saurcr;S: E- ER E, s n 15G5, I!,[elmap 1WREMENT P1'7i3'=an: Esn Jal _ Geutl'+I 2 h'qy Kn.�„ p,lr DperF'tieeWap' d]Re G7571ser Community F r `sompson Weston Year 2 Activities IV Four illicit discharges identified 10 Ten illicit discharges removed 10 Estimated 924 gallons per day of sewage removed from drainage system COVI D Impacts / Yea r 3 Activities ' COVID has made finding illicit discharges more difficult 41 Building dye testing has been suspended since March WK11 ' Investigations have continued 41 Dry and wet weather testing is Manhole testing 41 Better access to high traffic areas 41 Sewer and drain pipe inspections 41 Sewer and drain capital projects 2 i � ;g u 1 A Project Areas i, Y'rr Construction Site Impacts and Erosion and Sediment Control Requirements 1 Watertown o�o�!,�rnor Pu�bllcoIAS nr aii abuvt [his town.W Watertown Departmentof Public Works 124Orchard Street Watertown, MA 02472 TeL 617-972-6420 WATERTOWN Oeponmem ojN�6lic works Complete Streets/Green Streets 10 10 Stormwater Tree Trenches installed in Year 2 • Chandler Street (1) • Mangano Court (1) is Piermont Street (5) is Downey Street (1) is Katherine Road (2) Complete Streets/Green Streets ' Common Street bioretention basin completed in Year 3 10 4 Stormwater Tree Trenches installed on Frank Street and Louise Street in Year 3 10 2021 Road Program work plan 16 Stormwater Tree Trenches 8 drywells Mystic Stormwater Technical Assistance 10 EPA Technical Assistance Grant focused on nutrient control Collaboration with EPA, DEP, UNH, Cambridge, Lexington and Reading How communities are incorporating green infrastructure 10 Review and comparison of regulatory approaches 10 Discussion of Operation and Maintenance Plans Inflowr 1 Debris screen ■ r 1" Weep holes Sump Native soil Concrete weir wall Manhole Pavement Filter media Geotextile 1" Weep holes (Optional) Stone 0� �0 0 Extendable 4' section 12" Bypass r^ 112-1" Weep holes 12" (Typ•) Outlet pipe WATERTOWN OeNamem of ftblic works Year 3 Activities ' Review and update Ordinance and Rules and Regulations ' Working group formed with Horsley Witten assisting Reviewing existing practices ' Incorporate recommendations in Stormwater Management Plan Year 2 Activities ' Developed Stormwater Pollution Prevention Plans (SWPPPs) Standard Operating Procedures Continued street sweeping and catch basin cleaning .11,111,111,1111iiiii,it —1 Year 3 Activities 40 Implementation of SWPPPs Standard Operating Procedures Continue developing catch basin optimization plan I �_ Additional permit requirements for discharges to the Charles River (Total Maximum Daily Loads (TMDLs) for phosphorus and bacteria) Phase 1 of the Written Phosphorus Control Plan (PCP) must be in place by June 30, 2023 Watertown must reduce current phosphorus loading to the Charles River by 1,550 Ibs/yr over a 15-year period to meet Waste Load Allocation (WLA) under the TMDL Legal Analysis Analysis of existing regulatory mechanisms to identify any barriers to phosphorous removal or implementation of Low Impact Development (LID) practices Barriers, gaps and incentives identified in Watertown's regulations relating to the implementation of the PCP Phosphorus Reduction from Structural BMPs 10 Analyzed 20 private developments & 29 municipal parcels/right-of-way improvements ' EPA BATT Tool used for phosphorus removal calculations. Inputs include: BMP Type Area Treated by BMP (land use, impervious coverage) ' Design Storage Volume Phosphorus Reduction from Non -Structural BMPs 10 Phosphorus reduction credit can be obtained through catch basin cleaning and street sweeping is Calculations being performed to determine potential credit, based upon: Land use • Impervious coverage • Frequency of street sweeping/catch basin cleaning operations • Equipment utilized Identifying Areas for Future BMP Retrofits Used GIS to identify areas in town most suitable for the installation of green infrastructure Similar analysis previously conducted by the Horsley Witten Group on public parcels and rights -of -way under a 604b- funded project ' High -Priority characteristics include: Land Use (Commercial, Industrial, right-of-way) Soil Type (HSG A & 6 preferred) Lot size & percent impervious coverage Age of existing development Work currently underway g Areas for future H �'`yl n e r'4 �� Y iiT+f r. [iiti � hrrx� yr r•ai fie Y` y' Y il■ • � � y � - ,�• , 4y�9 r• tF1 �tIOJi ,}'4Y i F � Il..r,r ■a f S �Iwrl- ' a ; r Y -I •'JY t^�R Ci r.ey a tl' �u r `a�a•o./ F ri 5 ■ 5 Legend Ca nracAeas �.X'r■'I Fl .4. P6Drdy MurIbkppi SLIM •' PW.g- N W. YS Da. ' �.. -, , mil• �---, f, sax.. a■, Il:,Yr„[a _ t .., r■iYx.: suti av r.` G6 u■r' P. x-•" erg 4LII.�ri� N�' CO-_r 46mmimb 1 ?�v V WATERTOWN DoNamem of Public works Public Sites Identified on Slide 29 (by Horsley Witten) 1A- Library Parking Lot 113 —Town Hall 2 — Main St between Waverly Ave & Town Hall 6 — Porter St/Boylston St Intersection 7 — Worcester St/Springfield St Intersection 8 — Grove St/Kondazian St Intersection 9A — Lowell School @ Orchard St 9B — Lowell School 10 — Beacon Park at Arsenal St 12 — Common St Improvements 15 — Hosmer School 17 — Middle School Rear Parking Lot 20 — O'Connell Park Parking Lot 21— DPW Facility