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Home My Public Portal About604b Final ReportWATERTOWN GREEN INFRASTRUCTURE STRATEGY 2015-02/604 2015-2017 FINAL REPORT PREPARED BY: TOWN OF WATERTOWN PREPARED FOR: MASSACHUSETTS DEPARTMENT OF ENVIRONMENTAL PROTECTION BUREAU OF WATER RESOURCES _►9 U.S. ENVIRONMENTAL PROTECTION AGENCY REGION 1 w Irr,1,y s � Watertown c . !1 Department of Pualiorks We're all about ... this town" WATERTOWN GREEN INFRASTRUCTURE STRATEGY 2015-02/604 2015-2017 -- A WARTWey-im TOWN OF WATERTOWN PREPARED FOR: MASSACHUSETTS DEPARTMENT OF ENVIRONMENTAL PROTECTION BUREAU OF WATER RESOURCES AND U.S. ENVIRONMENTAL PROTECTION AGENCY REGION 1 MASSACHUSETTS EXECUTIVE OFFICE OF ENERGY and ENVIRONMENTAL AFFAIRS Matthew A. Beaton, Secretary DEPARTMENT OF ENVIRONMENTAL PROTECTION Martin Suuberg, Commissioner BUREAU OF WATER RESOURCES Douglas Fine, Assistant Commissioner DIVISION OF MUNICIPAL SERVICES Steven J. McCurdy, Director This project has been financed partially with federal funds from the US Environmental Protection Agency (USEPA) to the Massachusetts Department of Environmental Protection (MassDEP) under a 604(b) Competitive Grant. The contents do not necessarily reflect the views and policies of EPA or of MassDEP, nor does the mention of trade names or commercial products constitute endorsement or recommendation for use. Table of Contents INTRODUCTION........................................................................................................................................1 ProjectGoals..........................................................................................................................................1 ProjectPartners....................................................................................................................................10 ProjectStakeholders...........................................................................................................................10 PROJECTAPPROACH..........................................................................................................................12 ProjectKick-off.....................................................................................................................................12 Identified High Priority Drainage Sub-areas....................................................................................12 Graphical Information System (GIS) Analysis of Non -Point Source Loading (phosphorous)..13 Review of Historic Bacteria Data.......................................................................................................18 GIS Analysis of Priority Stormwater Subcatchments to Screen Potential BMP Sites...............18 Prioritized Sites for BMP Implementation.........................................................................................21 SiteEvaluations....................................................................................................................................23 Convened Meetings with External Stakeholders and Developed Final List...............................24 Surveyed Sites to Verify Feasibility of Preferred BMPs and Collected Design Data ................27 Prepared Conceptual Designs, Cost Estimates and Pollutant Removal Efficiencies ...............27 Further Review of Two Additional Sites...........................................................................................29 Developed Graphical Information System (GIS) Tool....................................................................32 RESULTS.................................................................................................................................................. 33 CONCLUSIONS.......................................................................................................................................34 EXECUTIVE SUMMARY Watertown is one of the most densely developed communities in the Commonwealth, and the EPA estimates that about 49 percent of its land area is impervious. Nearly the entire Town drains to the Charles River, with a small portion draining to the Mystic River via Wellington Brook. The Charles River is classified by the EPA as impaired for a wide range of pollutants including pathogens, (E. coli), n utri ents/e utro phi cation, oil and grease, total phosphorus and other pollutants. Over 80 percent of the Town's area consists of land uses that are shown by modeling to contribute high phosphorus loads to stormwater runoff. With an extensive piped drainage system, most stormwater runoff from the Town is discharged directly to the receiving water bodies with little to no treatment. Thus, the Town's stormwater runoff contributes to non -point source (NPS) pollution. The overall project goal was to increase Watertown's capacity to address stormwater quality issues using green infrastructure (GI). Green infrastructure practices are generally defined as structural stormwater management facilities that mimic natural hydrologic and biological processes to slow, cleanse and infiltrate rainwater where it falls. The project led the Town through a process of: identifying what areas are likely to contribute the most to NPS pollution; identifying where GI is likely to be feasible based on physical conditions; prioritizing potential projects that could implement GI throughout Town; developing conceptual designs for two potential projects; and educating Town staff, volunteer Boards and Commission members, and the general public about stormwater issues and the benefits of GI practices. This project resulted in several outcomes that will assist the Town in planning community -wide GI implementation, as well as prepare it to respond to opportunities as they arise: • High priority outfalls, where annual phosphorus loading is estimated to be highest, were identified using GIS tools. • A list of 22 sites was developed to target green infrastructure implementation. • Conceptual designs were created for two locations to carry through to final design and construction. • Two community meetings were held to discuss green infrastructure that were attended by the general public The Town has already used the potential green infrastructure project list to partner with a local developer to construct green infrastructure at Beacon Park and to incorporate green infrastructure elements into its Common Street road reconstruction project. INTRODUCTION Located six miles west of Boston, Watertown is a densely developed urban community of approximately 35,000 residents. The total land area of the Town is about 4.1 square miles, of which about 49 percent is impervious. Over 80 percent of the Town's area consists of existing land uses that are shown by modeling to contribute high phosphorus loads, including commercial (23%), industrial (7%) and high -density residential (52%) land uses. The Town is serviced by separate sanitary sewer and stormwater drainage systems. Nearly the entire town is tributary to the Charles River, with a small north -central section draining to the Mystic River via Wellington Brook in Belmont. Key water features in Watertown include the Charles River, Sawins Pond and Walker Pond. The remainder of the Town's water resources is buried in approximately 63 miles of drain pipe, ranging in size from 6-inches to 6-feet in diameter. Extensive stormwater runoff both overland and through Watertown's drainage system contributes substantial non -point source (NPS) pollution to the river and to local streams and ponds. Water quality issues in the Charles River are well documented; the segment of the Charles River bordered by Watertown is classified as impaired for a wide range of pollutants common to urban rivers, including pathogens (E. coli), oil & grease, nutrient/eutrophication, low dissolved oxygen, high pH, Chlorophyll -a, DDT, Total Phosphorus, and acute sediment toxicity. Furthermore, a Total Maximum Daily Load (TMDL) has been developed for phosphorus in the Charles River basin and a pathogen TMDL lists a number of locations in Watertown as high priorities for reductions. Watertown is required to reduce its annual stormwater phosphorous load by 52% in accordance with the Massachusetts Small Municipal Separate Storm Sewer System (MS4) General Permit effective July 1, 2018. Project Goals There are significant challenges in reducing NPS pollution from densely -developed urban communities like Watertown. Green infrastructure (GI) practices can offer a cost-effective way to meet those challenges. Given that the Town is already highly developed, it is likely that a variety of GI projects, undertaken on both public and private properties, will be needed to meet Watertown's NPS pollution reduction goals. The project had a number of goals: • Determine where GI could have the most impact by identifying where water quality improvements are most needed and where GI practices are most likely to be effective in pollutant removal. • Develop a list of potential high priority sites for future GI investments. • Identify two potential pilot projects and develop 30% designs. • Increase the general understanding of the public, Town staff and Town board and committee members that stormwater is an issue and GI is a potential solution. There are a number of steps necessary to determine how NPS pollutant loads are distributed throughout Town and where GI could help achieve pollutant removal goals. To have a better understanding of where water quality improvements are most needed, the areas of highest pollutant load were investigated first. Areas were identified that are contributing the heaviest bacteria loads, based on the Town's quarterly outfall monitoring along the Charles River, which has been conducted since 2006. The outfall data was combined with the results of the TMDL study to identify where water quality improvements will have the greatest impact. A large portion of the town drains to outfalls with high pollutant loadings. The next step was to determine where GI practices are likely to be most effective in addressing these problems, based on opportunities and constraints on the use of GI. There are a number of obstacles to siting GI projects, including unfavorable soil and subsurface conditions (such as high groundwater levels, poor soil conditions, or prior contamination) and existing land use patterns (limited rights -of -way, small parcels, and proximity to other structures). Second, a list of potential high -priority areas for GI projects was developed to guide future GI investments. This included integrating GI planning into the town's on -going road reconstruction program and other capital projects for publicly -owned properties. Third, to test and demonstrate the benefits of GI in pilot projects, public input was solicited on the choice of two pilot projects and 30% designs were developed. Discussions included developing a funding and implementation plan for each project. The stakeholders agreed that the pilot projects would be on public property, considering the installation of one pilot project in conjunction with a town road reconstruction project, a highly visible property, or at a school. Finally, to ensure that GI opportunities are realized in the future, planning for GI must be embedded in the Town's regular decision -making. This included increasing the understanding of GI practices among a number of key decision makers, including the Watertown's Planning Department, Department of Public Works (DPW), Planning Board, Zoning Board of Appeals, the Conservation Commission, and the Town Council. As well as raising awareness of GI benefits and opportunities among residents, developers, small and large businesses, school administrators, the Recreation Department, and all other public and private stakeholders whose decisions affect Watertown's land use planning. 2 Table 1: Scope of Services and Deliverables Task Description Deliverable 1: Identify Opportunities This task involves three components — and Constraints for GI in a. Applying GIS mapping approaches that have been developed in Watertown other 604b-funded projects to assess factors that affect GI effectiveness, to develop maps for Watertown; b. Compiling information on planned projects that offer significant opportunities for GI investments; and c. Using this information to select target areas for further investigation. 1.a Compile data on the 1. Identification of areas contributing highest NPS pollutant loads Series of maps showing factors that determine — with priority given to outfalls with highest bacteria levels identified factors affecting Green Infrastructure based on past municipal monitoring and land use -derived benefits, costs, opportunities feasibility and loading coefficients for phosphorus (based on analyses and constraints. effectiveness; and prepare conducted to develop the Lower Charles TMDL); maps illustrating the data 2. GIS analysis of locational characteristics that enhance or limit GI BMP performance, including slope, soil characteristics, depth to groundwater/bedrock, and location of prior contaminated sites; 3. Property characteristics (type of ownership — public vs private, business vs residential, by type). The GIS analysis will use ESRI ArcGIS. Data sources include MassGIS data layers, USGS, NRCS SSURGO and Town of Watertown data. 1. b Identify and map 1. Review the current Watertown Pavement Management Plan to Description of decision Table 1: Scope of Services and Deliverables Task Description Deliverable information of likely identify programmed road repair projects that are candidates criteria for selecting high opportunities for Green for green infrastructure retrofits. These are projects planned priority locations and Infrastructure investments for the next five years that are located in high -potential areas candidate GI projects. identified in Task 1.a and that could involve reducing street width, located along corridors with significant redevelopment activity, or otherwise offering opportunities for siting GI projects. 2. Review the Watertown Capital Investment Plan to identify planned projects at town parks, schools, parking lots and other facilities that could incorporate GI. Confer with the School, Library, and Recreation Departments to assess interest. 3. Compile and map a current list of proposed or expected redevelopment projects, to identify areas where rapid redevelopment activity is likely to create opportunities for GI projects. The most likely target areas are the Arsenal Street, Pleasant Street, and Mt. Auburn Street corridors. 1.c Investigate target areas Select up to five geographic areas for detailed investigation, based on List of candidate projects, to identify candidate sites physical site characteristics identified in Task 1.a and expected with descriptions of location, and projects opportunities for GI investments identified in Task 1.b. Horsley Witten pros and cons, and expected will investigate these areas in detail and prepare a list of up to 12 NPS pollution reduction candidate projects. Sites will be retained and ranked for further benefits consideration based factors such as, size of contributing catchment, ease of implementation, public education visibility, and property ownership. Data will be collected using tablet computers to confirm drainage area, utility constraints, traffic -related constraints, permitting requirements, adjacent land -use compatibility, and community acceptance potential. Table 1: Scope of Services and Deliverables Task Description Deliverable This list will provide the basis for soliciting public input and creating a list of candidate projects for future implementation (Tasks 2 and 3) and for selecting pilot projects for further design and development (Task 4). Task 2: Conduct Training on Two workshops on Green Infrastructure basics will be conducted for . Conduct 2 workshops (with Green Infrastructure for three key stakeholder groups: videotaping by local cable Town Boards, Staff & Public 1. Town staff (DPW, Planning Department, etc.); accesss) 2. Officials and Boards (Town Council, Planning Board, Zoning • Post presentation materials Board of Appeals, Conservation Commission, Stormwater on town website Advisory Committee, etc.); and . Compile attendance lists and 3. Developers, local businesses and other landowners, and the summary of public input general public (jointly with advocacy groups — Watertown . Prepare expanded list of Citizens and Sustainable Watertown). high -priority areas and To encourage participation, we will hold one workshop during daytime potential pilot projects work hours and the other in the evening or on a weekend. The purposes of the workshops are to: 1. Educate stakeholders about the benefits of and options for GI in Watertown and other urban areas, 2. Provide the information needed for stakeholders to participate in selecting pilot projects, and 3. Invite additional ideas for pilot projects and obtain preliminary feedback on the list of candidate projects. Table 1: Scope of Services and Deliverables Task Description Deliverable These workshops will build on the substantial public interest in planning for Watertown's future, as reflected in the town's recent Comprehensive Plan development, numerous public meetings regarding specific development proposals, and an active public debate about the town's new Design Standards. In designing the workshops, we will confer with town staff responsible for previous 604b-funded projects in Arlington, Belmont, and other communities suggested by the DEP project officer to identify factors that contributed to successful workshops and charrettes in those communities. The workshops will be videotaped for broadcast on local cable access, and the presentations will be posted on the town's website. Task 3: Conduct Public We will conduct a public charrette to review green infrastructure . Conduct public charrette Charrette to Identify Priority priority location maps, identify any additional opportunities, and apply Post presentations on Projects decision criteria to prioritize candidate projects. The meeting with be website publicized and in some cases co -sponsored by the DPW, CDPD, the SAC and local groups (Watertown Citizens, Sustainable Watertown, . Post expanded candidate list the local Chamber of Commerce, and others). Public officials (Town of sites and projects with Council and Boards), residents and major developers, businesses, results of voting developers of proposed projects and other landowner (e.g. Perkins Create and maintain a master School and Mt. Auburn Cemetery representatives) will be invited. "lessons list of projects for future Again, we will take advantage of learned" by Arlington, consideration in town capital Belmont and other communities in conducting similar charrettes. planning The combined input from the Task 2 workshops and the Task 3 charrette will be a master list of candidate projects that will be considered in selecting pilot projects in Task 4. In addition, this list will be maintained and supplemented over time by the DPW, as new road projects and public property improvements are considered in the Table 1: Scope of Services and Deliverables Task Description Deliverable town's capital planning projects. The CDPD will contribute candidate projects that may be identified as possible public -private partnerships in the course of development proposals. Maintenance of this list will ensure that the town continues to identify GI opportunities as capital projects and developments proceed. Task 4: Select and Develop Task 4a: Select pilot projects . Preliminary designs for two Preliminary Design and Based on results of the charrette, and incorporating any additional pilot projects. Implementation Plan for 2 Pilot GI Projects input provided b town departments and Boards, we will select two p p y p List of potential funding pilot projects for implementation. Horsley Witten will conduct field sources (with next steps for reconnaissance to finalize the selection and verify feasibility. While it pursuing.) is too early in the planning process to definitively describe the characteristics of the two pilot projects, we will strive to select sites Implementation plan for each that that can demonstrate: project • Green street techniques (for a street scheduled for major rebuild) • A highly -visible green infrastructure project on a public property (e.g. on library property along bike -pedestrian path). Task 4b: Develop preliminary designs for selected projects For each of the selected projects, we will develop preliminary designs and a funding and implementation plan, with a goal of executing the two projects within the next five years. • Develop 30% design plans and preliminary cost estimates. • Identify potential funding sources for pilot project implementation. Table 1: Scope of Services and Deliverables Task Description Deliverable • Prepare implementation plan and schedule. Task 5: Develop Tracking Recognizing that "We manage what we measure", Watertown will Tracking system, with initial System for Green design a tracking system to compile information on green inventory based on work Infrastructure Projects infrastructure investments on an on -going basis. The system will completed in 2014-2015 include responsible party, location, type of project and any estimate of anticipated and actual impacts on NPS pollution loads. Projects tracked will include town -funded projects on road rights -of -way and public properties, any projects on public land funded by private developers, green infrastructure components of new development and redevelopment projects (based on site plan review and as -built documents), and any residential or commercial green infrastructure projects that the town identifies through building permit applications or other means. DPW and CDPD will update the inventory each year, and work with the SAC to publicize the results as part of its continuing outreach and education efforts. The initial tracking database will include projects completed during 2014-2015. The intent is that the database would be expanded by incorporating previously constructed projects on file with DPW and CDPD to create a more comprehensive accounting of GI infrastructure in town, as time and resources permit. Task 6: Project Reporting Quarterly Reports — reporting progress on specific tasks plus memo describing preliminary results • Draft Project Report — report on the results of all tasks, including the methodologies used and the results of all Table 1: Scope of Services and Deliverables Task Description Deliverable stakeholder meetings • Final Project Report, incorporating MA DEP comments on draft documents (10 copies — 6 printed and 4 CDs — plus an electronic copy of each document). Table 1: provides an overview of the project scope and deliverable for each task. Project Partners The project described in this report was a collaborative effort of the Town of Watertown, the Watertown Stormwater Advisory Committee (SAC), the Charles River Watershed Association (CRWA) and the Horsley Witten Group (HW). This project aimed to engage municipal staff from a range of departments, including engineering, public works, conservation, planning, and health. The project also worked to engage stakeholders within the communities to play an active role in identifying potential best management practice (BMP) locations. Starting with the kickoff meeting, these stakeholders were invited into the process to share perspectives, information, and decision -making. The following individuals from each organization contributed directly to this project: • Town of Watertown: Matt Shuman, P.E. (Town Engineer), Gerald S. Mee, Jr. (Superintendent of Public Works), Steven Magoon (Director of Community Development and Planning), Christopher Hayward (Conservation/Preservation Agent and Tree Warden), and Gideon Schreiber (Senior Planner). • Watertown Stormwater Advisory Committee: Nancy Hammett, David Stokes, Ernesta Kraczkiewicz, Janet Buck, David Jay, and Brian Pizzi. • Charles River Watershed Association: Elisabeth Cianciola (Aquatic Scientist). • Horsley Witten Group: Richard Claytor, P.E. (President) and Janet Carter Bernardo, P.E. (Senior Project Manager). Project Stakeholders The prominent stakeholder group involved in the project was the Watertown Stormwater Advisory Committee (SAC). The Committee is comprised of three staff members and four citizens at large. A major objective of the SAC is to develop educational programs to increase public awareness of stormwater management. It also advocates for stormwater planning and funding. In addition to its "hands-on" role in the selection and ranking of potential green infrastructure projects, the SAC provided assistance in advertising the meetings and reaching additional community groups, such as Watertown Citizens for Peace, Justice and the Environment, Trees for Watertown, Sustainable Watertown, Watertown Concerned Citizens Group, and Watertown - Belmont Chamber of Commerce. Another stakeholder group included the various Town staff and members of the volunteer Town Boards and Commissions that are involved in a decision making capacity when reviewing development projects. This included the Department of Public Works (DPW) and the Department of Community Development and Planning (DCDP) staff, as well as members of the Watertown Planning Board, Zoning Board of Appeals, and Conservation Commission. The project team involved Town staff directly in the various grant activities and also reached out to the Board and Commission members to invite them to participate in the community meetings. Finally, the development and construction community was considered to be a stakeholder. Although the grant focused mainly on identifying green infrastructure opportunities on public property, it was acknowledged that developers have the ability to implement these practices on their own properties as part of site development to improve stormwater management. The diffuse nature of this group made direct outreach difficult, however as discussed below, the group and its needs were considered in selecting the projects for conceptual design. 10 ELL d u c u 4 f� 0 D Legend Horsley Wine:. -.::.., p 0 * Outfalk to the iCharEes River in Watertown ��— Suhcatchment Areas MassGIS Suhcatchment Areas and Town of Watenown OutfaMs to the Charter River 4 1,251] Watertown, MA 1" = 1,350 ipet oiler:r,+.±a— F'C. . Figure 1: Watertown Subcatchment Areas and Outfalls 11 PROJECT APPROACH There were five components to the project approach: 1. Applying proven analytic and planning methods to identify opportunities and constraints for green infrastructure projects in Watertown, 2. Educating key decision -makers about the benefits and practicalities of green infrastructure projects; 3. Developing a list of priority sites and projects for town road, parks and other public property improvements. 4. Engaging in a broad stakeholder effort to select and develop preliminary designs and implementation plans for two pilot projects for initial implementation. 5. Developing a reporting process to track GI components of future developments and redevelopments on both public and private property by either the property owner or the town. Project Kick-off The project began with a kickoff meeting on November 24, 2015 to discuss the scope of work, timeline and project management. The meeting was held with representatives from the Watertown DPW, DCDP, HW, MassDEP, and CRWA. As one of the objectives of the grant was to integrate the use of GI practices into long-term planning, a primary topic of discussion was the Town's current short and long-term capital plans. This included the Town's Pavement Management Plan and other planned road projects, as well as planned utility work and capital projects. During discussions the Team identified a number of potential opportunities to incorporate GI practices. These included the Watertown Public Works site, Common Street, Mount Auburn Street, and Beacon Park. The materials associated with the kickoff meeting are available in Appendix 1. Identified High Priority Drainage Sub -areas Areas of highest pollutant load were identified, to better understand where water quality improvements are most needed in Watertown. The Charles River is impaired for phosphorus and bacteria, the TMDL requires a 52% TP reduction, and a variety of data has been collected and analyzed; therefore, these two pollutants were used to prioritize drainage areas. As part of the Town's illicit discharge detection and elimination (IDDE) and Municipal Separate Storm Sewer System (MS4) programs, the Town has already been subdivided into smaller drainage sub -areas, based on the location of stormwater outfalls or interconnections with adjacent communities. The Massachusetts Bay Transportation Authority (MBTA) and the Department of Conservation and Recreation (DCR) own properties in Watertown and each respective stormwater system is operated by its owner. These areas were excluded from the analysis. 12 Graphical Information System (GIS) Analysis of Non -Point Source Loading (phosphorous) A TMDL analysis of the Charles River has already been performed and accepted by the Environmental Protection Agency (EPA), technical information already exists to model phosphorus loading. The Project Partners used this information and existing MassGIS land use data to estimate phosphorus loading in each sub -area. The land use data available from MassGIS and the Town of Watertown included impervious area and land use type. The Project Partners assigned a phosphorous export coefficient to each land use type using data obtained from the 2014 MS4 Draft Permit Appendix FAttachment 1 — Table 1-1, Annual Composite Phosphorous Load Export Rates. Table 2 below illustrates the land use categories and export coefficients utilized in the Watertown analysis. MassGIS Land Use Category Composite Phosphorus Load Export Rates (lb/ac/yr) Cemetery 0.33 Commercial 1.16 Cropland 0.45 Forest 0.12 Forested Wetland 0.12 Golf Course 0.45 High Density Residential 1.07 Industrial 1.29 Marina 1.16 Multi -Family Residential 1.07 Non -Forested Wetland 0.12 Participation Recreation 0.33 Transitional 0.33 Transportation 0.78 Urban Public/Institutional 1.16 Water 0.45 Cemetery 0.33 Table 2: Land Use and Phosphorous Export Coefficient. 13 The Project Partners then calculated the total phosphorous loading within each individual sub- area by multiplying the land use type area determined from GIS data determined from MassGIS and the Town of Watertown with the phosphorous export coefficient listed in Table 2 above. Table 3 illustrates the phosphorous loading per subcatchment area. Catchment Area Acres Total Phosphorous Ibs/year Total Phosphorous Ibs/acre/year 0 18.91 18.67 0.987 1 89.94 69.06 0.768 2 0.68 0.88 1.290 2/3 4.84 5.13 1.060 4 18.54 23.50 1.267 5 24.17 27.93 1.156 6 169.30 173.33 1.024 7 2.43 2.79 1.148 8 63.41 67.75 1.068 9 14.81 14.36 0.969 9/10 5.76 6.33 1.099 11 31.87 33.64 1.056 11 a 190.42 200.92 1.055 11 b 70.31 74.13 1.054 11 c 188.66 179.81 0.953 11 d 39.87 37.28 0.935 11 e 110.72 116.47 1.052 12 106.00 117.27 1.106 14 13 2.19 2.26 1.033 13/14 4.10 3.49 0.850 14 7.44 6.68 0.897 15 12.14 12.60 1.038 15a 2.44 1.53 0.627 16 8.72 7.59 0.871 17 3.42 3.31 0.969 18 104.00 116.11 1.116 19 19.02 14.15 0.744 20 39.42 42.95 1.090 20a 62.92 56.58 0.899 20b 194.64 212.69 1.093 20c 265.49 248.55 0.936 20d 83.47 75.36 0.903 28 0.79 1.01 1.279 29 1.69 2.19 1.290 31 5.97 6.96 1.167 32 6.17 5.94 0.963 33 50.76 49.89 0.983 34 3.88 4.01 1.032 35 0.76 0.81 1.063 36 1.12 1.20 1.071 15 37 11.96 13.83 1.157 38 17.72 20.20 1.140 99 87.35 83.80 0.959 109 61.62 59.40 0.964 A 0.88 1.14 1.290 B 1.34 1.73 1.290 Belmont 36.28 38.87 1.071 C 1.68 2.17 1.290 Cambridge 19.32 19.61 1.015 D 4.24 3.07 0.724 Newton 7.43 8.35 1.123 Table 3: Watertown Phosphorous Loading per Subcatchment Area Utilizing the data calculated in Table 3, the Project Partners created Figure 2 to illustrate which sub -areas have the highest phosphorous loads per year. The darkest colors clearly indicate that subcatchments 11 a, 11 c, 20 b, and 20c have the highest loads contributing to outfalls 11 and 20. These sub -areas include some of the most densely developed and commercial/industrial land uses in Town. 16 - - WALi14Ah1 . i yew •w6 11a 6 11 a 20C 20h `. GAPAH - AO afi mr - IL WatertDwn Phosphorus Loading ; utfall + I I 7own of Watertown, MA 200-250 Figure 2: Watertown Phosphorous Loading per Subcatchment Area 17 Review of Historic Bacteria Data The Town has been performing water quality sampling, including E. coli counts, at its outfalls for over 15 years. The E.coli median value was calculated for each outfall using the total data -set obtained (which includes both dry weather and wet weather events). Table 4 illustrates the E.Coli median values recorded per outfall determined from the total samples collected by the Town and the following bar graph provides a clear visual of the extreme difference between the outfalls utilizing the same data. The median value for each catchment area was then compared with the MassDEP Surface Water Quality Standard for recreational use in Class B water, which is 235 CFU/100 ml, as well as a more typical value for urban stormwater, listed in the EPA Results of the Nationwide Urban Runoff Program as being in the range of 10,000 CFU/100 ml. The highest median E. coli levels were observed at Outfall 11 and Outfall 12, both located in Watertown Square. The Town also noted that Outfalls 20, 99, and 109 were prioritized as part of its ongoing IDDE Program, based on dry weather bacteria levels. 40,000,00 35, 000.00 30,000.00 25,000.00 20,000.00 15, 000.00 10, 000.00 5,000.00 E.Coli median Total Samples - Watertown ❑utfaIIs ri N N V Ifl �D f� W m ri N /1 V Ifl �D M1 W Q� O ri N M V Ifl �D f� W m m ❑ ❑ ❑ O ❑ ❑ ❑ ❑ 0 c ❑ ❑ a ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ a a o ❑ a ❑ o u u M O Table 4: E.Coli Median Levels Recorded per Outfall Bar Graph ■ E.coli Median GIS Analysis of Priority Stormwater Subcatchments to Screen Potential BMP Sites The numerous stormwater sub -areas were evaluated utilizing MassGIS and town mapping resources discussed above. Taking into consideration impervious area, land use, soils, topography, historical bacteria data, and total phosphorous loads, four sub -areas were identified as being priority watersheds. They are: 11 a, 11 c, 20b, and 20c. 19 Soils A soils map was created utilizing aerial imagery from MassGIS 2013 and GIS Data from the Town of Watertown and MassGIS. The Soils figure includes designations of soils categorized by hydrologic soil groups (HSG), A, B, and C, as well as Udorthents, Urban Land, and Water. HSG A has a high rate of infiltration and low runoff potential, HSG B represent soils that have moderate infiltration capacity, while C represents soils with low infiltration capacity. Udorthents, though typically well drained soils, and Urban Land do not have hydrologic soil groups associated with them and therefore require field soil testing to confidently determine if a location will allow stormwater to infiltrate. A majority of the Town is listed as Urban Land which consists mostly of buildings, paved roads, and parking lots. Most areas are in intensely built up portions of the Town. Figure 3 illustrates the Soils map created and also denotes slopes steeper than 15%. It is difficult to construct infiltration practices on steep slopes; therefore these areas have been excluded from potential green infrastructure locations. 19 eax 5� so5 655 82M 14zm i 2S7 6 223A i 1 651 C 65s Legend 1. warer 2549 - Merrimac 621E-560 cuoem-ro.a was r Horsley Witten Group ! Outtall LJ Town Boundaries 2A-Pootatuek 2606-Sudbury 623C-Waodbridge s.•, 3 Drainage Area 11-Ile Hydro Group I039-Charlton mml- Paxton 6248-Haven Drainage � A � udorthents 223A - 5do 3250 - hlewpvrt 6268 - Merrimac 655-Udvrthents IN656- Soils Map - Outfallll B Urban land 2C3238-Stia 2538-Hinckley 3358-Rolabow 340S-8raadbraok 627C- Urban land 62K-Canton Udvrthents Watertown Square and Parcels Town of Watertown Parcels C ;^later 2530- Hinckley 42a8 - Canton 63IC- Charlton U 1.aou Common Street Town of Watertown 340d - 8roodhrook 602 -urban land 633 - tldorthents f l" Potential Locations for Green Infrastructure C3 >Is% Slopes 415C - Nurrrrgansett 603 - Urban land 654 - Udorthents = I'm hot oete: z j13f2o1s rfPu r Figure 3: Hydrologic Soil Groups for Outfall 11 in Watertown 20 Prioritized Sites for BMP Implementation The Project Partners met on March 17, 2016 to identify town properties or upcoming projects that could be appropriate for green infrastructure. A number of criteria were used, including; • Streets that were being prioritized as part of the Town's Road Reconstruction Program; • Road corridors that could be reconstructed as part of future capital projects; • Roads and other surfaces with excessive road width or impervious area that could be reconfigured or removed as part of future capital projects; and • Town -owned properties, where space could potentially be set aside for future GI installation. The Town Hall complex (including Town Hall, the library, and Saltonstall Park), the Main Street and Common Street corridors, and Lowell School were identified as potential locations to install GI practices, as well as numerous road locations and intersections, such as the Beacon Park intersection with Arsenal Street and the Grove Street and Kondazian Street intersection. A kick-off meeting was also held with the SAC at its March 17, 2016 meeting. A draft GIS map was presented that included the following information: aerial photographic map of Watertown, town parcels, drainage catchment sub -areas, and locations of outfalls, street names, water bodies, wetlands, drainage structures, topography, and AUL sites. Three other draft maps were also provided to illustrate the catchment areas, soils, and slopes greater than 15%. The SAC reviewed the maps and placed pins on the map providing input about potential GI locations. In all, the Project Partners identified 21 potential sites for further evaluation as illustrated in Figure 4 below. The materials associated with the March 17, 2016 meeting are available in Appendix 2. 21 s jo OV 117 a � ^ A l M.+1fwi�MNiw Mw�.YRw W.wnM.� Ise . .M..0 fii.uau.r...��fs�tiuwui.• � � � iNx'fai�rMnrr L rw n.m.n � `4�r• { - � 1l ra.�wryPnl•Y.N:.. PN�r.n...{Ya+r SrYr.,. a�r.Mn -00 - - it MIA. M1.M 7] Legend '^ �^� "'°��, Homey vvlt" Group -' ivs rwa Y.n xvxnwn a wYris Sw.r•wn i...n..r�..Y�i W�mw Potenllal iocatlons fix "•°°.�� Gran nrrysfructum O ier Parcels (,yrneter�. i Park Town 6ounddry Potential Locations for Housing Parking J�GreenInfrastructure �Ir+eer + 7 `1 t{rtr PrlLaie n SA8 MunicipLO Budding School i-=son fFH. Gitf-2f1l17013 flpYMe Figure 4: Potential Locations for Green Infrastructure in Watertown 22 Site Evaluations Site visits were conducted at each of the 21 potential sites and each location was evaluated for suitability for GI using the following criteria: • mapped soils and topography; • public visibility; • potential to capture sizable impervious area; • cost to design and install the required stormwater infrastructure; • location within a priority sub -area, • future maintenance needs; and • whether public improvement design was in process. By utilizing the maps created, those areas contributing the highest NPS pollutant loads were identified and then each of the 21 potential sites was categorized based on the evaluation criteria to determine which locations may be the most effective in reducing NPS pollutants into the Charles River. Based on this analysis, the Project Partners prioritized the original list of 21 potential locations to 12 candidate sites to be further discussed with the Town and the stakeholders. Figures were created to discuss the candidate sites and to assist the stakeholders in making informed decisions. An example of the two figures created for the Beacon Park intersection at Arsenal Street is provided below. Similar figures were presented to the stakeholders at a public meeting and can be found in Appendix 3. Bacon Park @ Arsenal St. Location Beacon Park at Arsenal St. Id. No. 10 Impervious Area 0.4acres Public VAsibfflty Medium coat Medium Priority Watershed No Maintenance Law PI Design in Process Yes Potential BMP Sioretention Area 23 Convened Meetings with External Stakeholders and Developed Final List Community Meeting #1 The first community meeting was held on June 21, 2016. The meeting was scheduled on an evening that Town Hall was open late so that Town staff would be able to attend the meeting in addition to the general public. The objective of the meeting was to provide participants with an overview of: • what sources of stormwater pollution exist in Watertown; • how stormwater impacts the Charles River; • what green infrastructure practices are and how they treat stormwater; and • where they could be implemented in Watertown. At this meeting, the discussions involved the prioritization process and the detailed descriptions of the 12 candidate sites. Table 5 and Figure 5 illustrate the 12 candidate sites prioritized for GI practices. As part of the presentation, detailed information about each site was provided to assist stakeholders in selecting pilot projects. At the end of the workshop, feedback on the candidate sites was solicited. A couple of additional sites were added to the potential list of sites, including Bishops Walk. The stakeholders agreed on the top five priority sites based on visibility, cost, maintenance, location within a priority watershed area, and future public improvement projects. 24 ...ti.. �'t4• � � �R': �pw �Js a'A Nnrtlgn Ac >ka`gnar' h{J1y5' ey a 4 Aaw'4'�'rYRrfn tir ad I.ru„ �.nni.kn s 2 V!d°u5s5 JL ° P Wpw"r'S�dN K. Std v flat" iiii.. ,} *n• dp 45 I'RIIIgmrq n LNG• a L 4 • i.. . ri •y.� i 1.F'T5 45 rrd[ SZ 11MMA.liir a pV' Hd M x -3aw 91 .4r II" �,• ��,. 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[r �T i 4' �yAhr Arc d' S ' ^'aa ku s �4,." d Noy �5� p *v r �,. o- lfanrti,.,, v a,u•r s Pro B fr'nrh : Y6'Pr m q 4 K a C rid d 4"dA a a C a,P7f H� Pr l e a 6r ur to b r -- G'~ ' 'p i L ph am 51 , r+rW.... n b p N b R �.6a � � � + �qy 9�kn � • � LSahSSrkpN 4� if � t �kyr an I.,r ��i}ri m c de w � �f a` � r, �Pa 9}$ s cgrf R � � n 6 mr,�re ANewmu �rwwlrrr` gas '•,� 3 +i By; y BSI S ,� � q�pM p r rywd °w rl� h I a hear ,s e" yi da r4 5 - rhrv. s 5 `�^ fi0 .w4e�vFa birllli. -4, q ZF� �Marere �l •y F'1JrN; A W at,� }r! W n % .�' r.T`• .}$ f �, sr 9 ■�� 40 0 u wi 41 fi F s 5 lirnm 7l sr 1 P s +rr ve .. e 6 ,� 4 ff* g q I, ,FI,IpF.lk. T. r' hnf �'re�rrra r 'lrr { ....i !k Oil, v, �i weo.w� i }' _ . R� cyp—. 816 1' Caliir„., ttllrlmnio yl ld—n Rd i, ��.. a 1 v...- Hr""rb' AV. A u N x.q,l $ a«8 a" s Ara ar W hlnn bl J+I. C I t �' &w Morranprm w `� �p4l r rHHsl �.r "r, �.avr k .I._ .. +f n r rrami4r f s Lbcsms�r r'a'n. rf k5;}2crs37i�:5 � i5 i49tzrfe.r AtCai �SC.SII,H�sl7dd.: d F'caY,a�,ac-- : ,; Legend Horsley Witten GroupWor Library Parking Lot 0 St.fSpr ngfeld SL Intersectiesteron Intersection 0 Beacon Park at Arsenal St. �� iEr7e1 Hosnter School Entrance Department of Public Works +r; mnarxwenrirmimenfyisnrnxn_r lP - " �� N'T N � i �� frl:i Town Hall Grove SLIKondazian St. Common SI. Corridor GL1:i Hosmer School Intersection G Main St. between 0 Lowell School at � Common SUSpring St. � Middle school Rear Parking Lot In of Candidate Sites Ta�vn of Watertown, MA n, '14'averlykve. &Ton;r Hall prchard St, Intersection U ' 250 0 Porter StJBoylstor :. Intersection Lowell School Common StlOrchard St. Intersection 4'Connelt Park -Parking Lot 1" = 1,250 feete-a+��6te [uat Figure 5: Candidate Sites for Green Infrastructure 25 I In pervious Priority Area(acres) Outfafl Catchment Potential Comments Regarding Pubilic Watershed Initial P-1blic r-I:lav=inert No. Location to Proposed Number Area BMP Potential BMP VisibWity Cost 111a. 11c, Maintenance Ranking Design Comments f.ct=s BMP 206 2flc - .".-- -_- -:. 1 -1 Po:ert al: PAay be Bic-i t : - - - inco•porated into a v,h — e 1A Library Parking Lai 0.34 11 1_a - _- _. - ... - - -.-_ .c H-;t Medium Yes Lnty Lo'x rampus•edesign. Potential: May be _" incorporated into a v.1•; e 1B Town Hall 0.01 11 1L Rain garder-::rtc-. Huh Low Na Lnty Lo'x nampusredesign. Tree Road narrowing design in Main St. betty Waverly Trenches and bl— rr,. , -_ _ .- _ .s.rai � concept phase. Have 2 Ave. &Town Hall 0.85 TL 11 Bioswales . �-�� - H;h Medium No LOW Medium design plan Mt. Auburn road design in Power St.f Boylston St. Bioretentim _ . F_ _ . _ __ _ , _ progress. Hawe design 6 Intersecdon 0.S5 20 20c Area rc�::::.:,,a:narx. Low High Yes Law Low plans.sheet 10of19- WorcesnerSt.[Springfield 5Ts s...:.......... ._ 7 St. Intersection OA9 11 Llc Rain garden rtaa:y tar: ;, r,s :_- n Low Medium Yes Law Low New water hne Grcue St- 6a dmian St Bioretention vet— b-ee, ;Je 4Sr.N�d,e 8 Intersection 0.54 20 20b Area cma�rdr—p. Low High Yes Low Low KG Loweli School at Orchard Biore:ert=on ,im.ie xuamaa!mrer 4A St. and George St. 0.1s 11 Lir Area C.0—r.a2err2m&ureast— High Low Yes Low High No 46 towel,School 0.04 11 11r Rain Barrels "in mr— et hrm— {mN n]u-s, Eesr r-r,ro—rrt High Low Yes Latu Hi h Na Bioretention 41dtl {apterc PGrt� of M'J[AW y`a em 10 9eacanPark atArsenal St. 0.40 18 18 Area r.—, h61 Med;um Medium No Low Medium Developer redesigning Common St.j5pring5t Bioretention irmorP3wtct'o-,Un6x 6.5pin6 Have a design plan, the 12A InWrsectian 0.48 11 11e Area srlmsrrwrst'slxc High Medium No Low High I des%nismoving forward. Tree Trenches andccrrr:xnsr-tmrr—z,,m; n Have adesiEn the rrtici�xy trnrwla mclrxerk rdlin plan. g Fdesign 12B Common St. Corridor OAS 11 11e Bioswales r�rrcrserivcmtw High Med;un No Laty Medium is moving forward. Tree Common St. (Orchard St. Trenches and 0`—Etre mmmr bars Have a design plan, the 12C Intersecvcm 0.07 11 iie Bioswales rrr.,nemn+.e High Med:um No Law Medium design ismoving forward. 614reterliVO?7 Gr- xee near hart d— pxtiq a r6—be 131 ai rt:e :erex.1 1SA "osmerSchool Entlance 0.14 20 20c Area dperd,5b:. High Medium Yes Loty Medium No E «was- aaaont to prrgoaaa — 15B Hosmer School 0.23 20 24c Bioswale -rpct" Medium Medium Yes Law Low No Middle School Rear Eetlk'�5�.xe-ar::h»t-Fe,cabat [ahh xs R rr.rc tip eei.--:c 17 Parking Lot 0.19 11 1la Bioswale trdsr,.z-:are Medsum Low Yes I Low Medium ING O'CanneLlPark- Parking Permeable G000a]»tJitlTur.'eratselG 20 lot 0.12 20 21k I Pavement r—m—. Medium High Y'es Medium Low No D artmentofPubbi Biore:e1-te tas'`t'aYY'a,exeetlpmmtta 21 Works I -7.4€ 11 11" e: :::c:::::= High Low Yes Low High No Table 5: Candidate Sites for Green Infrastructure KI The five priority sites included: • Lowell School at Orchard Street intersection • The Department of Public Works (DPW) parking lot on Orchard Street • The intersection of Common Street and Spring Street • The entrance of Hosmer School • The intersection of Beacon Park and Arsenal Street At the September 15, 2016 SAC meeting, the top five priority sites were reviewed and discussed in greater detail to further prioritize the top two locations that would be carried to the (30%) conceptual design stage. It was decided that a high priority for selecting the two sites was visibility. Committee members were interested in selecting sites that would be seen by the public to provide an educational opportunity and showcase how GI could provide aesthetic benefits in addition to stormwater benefits. The SAC also desired the potential projects to be spread geographically throughout Town. The SAC selected the DPW site as one of the locations to continue through conceptual design. Although the site is less visible to the general public (unless they visit the DPW building on business), the site is highly visible to developers and contractors, who often attend meetings or perform business at the office. Developers and contractors are a significant target audience for GI practices, since they have the ability to incorporate them into their stormwater management programs. The SAC also agreed that a school would be a good choice for the second conceptual design. The Town's schools are highly visible community assets and would also allow for incorporation of green infrastructure and stormwater management into the school curricula. The Committee selected the Hosmer School site to proceed to conceptual design. The meeting materials are included in Appendix 4. Also included is a copy of an electronic newspaper article published about the meeting. Surveyed Sites to Verify Feasibility of Preferred BMPs and Collected Design Data To develop the conceptual designs for the DPW and Hosmer School sites, topographic/land surveys were compiled and soil test pit evaluations were conducted to determine the depth to seasonal high groundwater and verify the soil types in these locations. In December 2016 and January 2017 soil testing was conducted at the DPW and the Hosmer School. Concurrently soil testing was conducted on Common Street as a roadway improvement project was underway and there was an opportunity to include green infrastructure during the design phase. In March of 2017 a land survey of the DPW parking lot was conducted by Bryant Surveying, because as -built information was unavailable. At the same time HW digitized an existing as -built plan originally prepared for the Hosmer School. The land survey plans and the soil testing were utilized to develop the 30% conceptual plans for the two sites. The plans were presented to the SAC in June 2017 for their review and discussion. Prepared Conceptual Designs, Cost Estimates and Pollutant Removal Efficiencies As the final project task, Horsley Witten Group, Inc. (HW) completed two conceptual BMP designs. An initial set of conceptual designs was shared with municipalities to identify conflicts or aesthetic issues. Final conceptual designs were completed following a period of input. No 27 significant changes were requested by the municipalities. Included below are brief descriptions of each BMP design. The full conceptual design plans are included in Appendix 5. Department of Public Works Site The DPW site, located at 124 Orchard Street, contains nearly the entire DPW operation. The drainage area captured in the conceptual design included approximately 0.5-acres of the parking lot in the front of the site. In contrast to the heavy industrial use at the rear of the site, the front parking lot is mainly used by employees and visitors to the building. Runoff from the project area currently discharges to a single catch basin with a hood and deep sump. A particle separator provides further treatment prior to discharge from the site; however the treatment train provides no opportunity for stormwater infiltration and little total phosphorous removal, with the pollutant removal limited to sediment. The DPW is located in the prioritized outfall 11 drainage area. The conceptual design for the DPW parking lot includes removing approximately 500 square feet of the impervious asphalt surface currently containing two parking spaces and converting the area into a bioretention basin. A paved waterway has been proposed to capture stormwater runoff that currently flows into the single catch basin. A sediment forebay is included to capture and collect the sediment including debris or tracked sediment that is deposited on the parking lot. Stormwater will flow into the vegetated bioretention basin from the forebay over a stone check dam. The depth of the bioretention will allow stormwater to pond approximately 9-inches prior to overflowing into a beehive grate and back into the municipal closed drainage system beneath the parking lot. An underdrain will prevent long term ponding of water in the basin. A bioretention basin is a shallow landscaped depression designed to capture stormwater runoff for treatment and/or for infiltration through natural processes. A bioretention basin provides excellent benefits including runoff reduction and pollutant removal as well as being aesthetic pleasing with native landscape plants specifically chosen to tolerate drought conditions as well as periods with wet roots. The installation of a bioretention area typically has moderate cost with minimal maintenance needs. One issue that will need to be resolved during final design is the loss of two parking spaces. During peak use, the parking lot is occupied at full capacity. There may be an opportunity to mitigate the parking loss by reconfiguring the lot (i.e. restriping). Hosmer School Site The Hosmer Elementary School is addressed at 1 Concord Road; however the project area is limited to a portion of the driveway entrance off of Hancock Street. The drainage area from the driveway is approximately 0.14-acres in area, and runoff is collected through a catch basin with a deep sump and treated through a particle separator, similar to the configuration at the DPW site. The Hosmer site is located in the prioritized drainage area of outfall 20. W Figure 6: Existing Area at Hosmer School Targeted for Bioretention System The conceptual design for the Hosmer entrance area includes converting an existing grass island located between the entrance parking area and the Hancock Street sidewalk to a bioretention basin. A small portion of the east driveway will be regraded to relocate the low point from an existing catch basin to the curb at the island. A paved waterway will be installed to capture and direct the stormwater from the entrance driveway and parking lot into the bioretention basin. A sediment forebay is included to capture and collect the sediment that is deposited on the parking lot. Stormwater will flow into the vegetated bioretention basin from the forebay over a stone check dam. The depth of the bioretention will allow stormwater to pond approximately 9-inches prior to overflowing into a beehive grate and piped back to the existing catch basin located in the access driveway. An underdrain will prevent long term ponding of water in the bioretention area. Further Review of Two Additional Sites During the fall of 2016, opportunities to further develop and implement two additional priority GI projects outside of the grant scope developed and were undertaken by the Town. Beacon Park at Arsenal Street As noted during the project screening, the Town had worked with an adjacent developer to provide a road closure of Beacon Park at the intersection with Arsenal Street. The short segment of impervious road scoped to be removed was intended to be replaced with a small parklet. The initial steps proceeded in the fall of 2016, including the formal "discontinuance" of the road. However, the landscaping plans for the park had not been finalized. Using the information identified in the project screening, the Town approached the developer and requested that they implement a GI practice in conjunction with the park work. The developer agreed, and requested that the Town provide the design. The Town worked with HW to produce a construction level design that would implement the concept identified through the initial project screening. 29 It was observed during the site visit to the proposed parklet location that the Beacon Park roadway was sloped towards the parklet with existing catch basins approximately 100 feet upgradient and two existing catch basins located within the parklet. Stormwater runoff that was not intercepted by the upgradient catch basins would flow into the parklet and could be treated by a stormwater practice. After discussions with the Town and the Contractor it was agreed that the site lent itself well to a small bioretention system with native plantings and a bench. Figure 7: Constructed Bioretention System at Beacon Park and Arsenal Street The design included the installation of a granite curb along the Beacon Park edge of the parklet with two paved waterways on each corner to allow the stormwater to flow into the practice. The paved waterways discharge to stone swales creating a forebay area to capture the debris and sediment flowing off the roadway. A stone checkdam was installed to separate the forebay from the bioretention area. The grates of the two existing catch basins located within the parklet were raised slightly and replaced with beehive grates. Approximately 24 inches of soil within the bioretention area was excavated out and replaced with a layer of gravel, pea stone and 12 inches of bioretention soil. The bottom of the bioretention area was graded to be approximately 6-inches below the beehive grates so that stormwater can pond and infiltration through the soil. The bioretention area was planted with Thread -leaf Bluestar, Ruby Star Purple Coneflower, Blue Flag Iris, and Shenandoah Switch Grass. A bench was installed for the comfort of the neighborhood. An educational sign was also placed to bring attention to the stormwater benefits of the bioretention area. The design plans can be found in Appendix 6. Construction of the bioretention basin at Beacon Park was completed in the summer of 2017. Common Street The Common Street corridor was also identified during preliminary project screening as a likely candidate for GI because of planned road improvements being developed. During the fall of 30 2016, these plans became more concrete as a result of funding sources for the construction being identified and approval of conceptual plans. The Town engaged HW to work with its transportation engineering consultant to further review Common Street and design green infrastructure practices to fit into the road design. HW and Town staff conducted a site walk along Common Street and the adjacent neighborhood to determine the viability of installing GI practices along the Common Street corridor. The grade of the roadway and the location of numerous utilities including a large Massachusetts Water Resource Authority (MWRA) water main limited the opportunities, however it was agreed that two locations along Katherine Road and the island between Spring Street and Common Street appeared to have potential. While conducting soil testing at the DPW and Hosmer School sites, HW and the Town also conducted additional soil testing along Katherine Road and within the Spring Street Island. HW determined that two trenches were feasible for Katherine Road. One tree trench was designed at the intersection of Katherine Road and Common Street. The roadway radius in this area was being adjusted by the roadway designers allowing for sufficient areas off of the roadway and without any utilities conflicts to design a 400 square foot enhanced tree trench. A second location at the intersection of Katherine and Church Streets was chosen to design a 300 square foot enhanced tree trench. An enhanced tree trench utilizes a catch basin to collect the stormwater runoff in the roadway. A perforated pipe is installed as an outlet pipe lower in elevation than the primary outlet to the municipal system. The perforated pipe allows the stormwater in the catch basin to flow under the sidewalk through a trench of crushed stone approximately 30 inches deep, 8 feet wide and 40 or 50 feet long. A tree is planted above the crushed stone in tree planting soil approximately 30 inches deep, 30 inches wide and 7 feet long. The stormwater collected within the crushed stone is able to infiltrate through the soil beneath the stone or is taken into the roots of the tree above the stone removing pollutants that would have be sent directly into the municipal system and eventually being deposited into the Charles River. For the Spring Street Island it was agreed that a large bioretention area with a forebay would be designed that included educational signage, native plantings, trees, a walking path, benches, and large boulders. Stormwater flowing into two proposed catch basins on Common Street would be captured and directed via an 8-inch pipe into the forebay. The forebay will be lined with drivable concrete pavers to allow the Town DPW crew to easily remove the accumulated debris. A short segment of the pathway will serve as the overflow weir and will also be surfaced with the drivable concrete to prevent gullies and erosion of the side slope. A landscape design which incorporates plants and boulders within the bioretention depression has been developed to create an aesthetically pleasing and environmentally friendly stormwater feature. A beehive grate will capture the overflow and direct it back into the Town's municipal system. The preliminary design plans can be found in Appendix 7. Construction of Common Street is anticipated to begin in 2018. Community Meeting #2 At the June 22, 2107 SAC meeting the Project Partners reviewed the conceptual designs in greater detail. A second community meeting was then held on September 14, 2017. Entitled "Green Infrastructure in Action," the objective of the meeting was not only to discuss the two 31 conceptual designs in more detail, but also to update the public about the additional GI implementation opportunities that had arisen since the first meeting. The project team also recognized that many questions from the public were related to how developers implement GI and stormwater management on their own properties. Accounting for this, and the desire to further educate the stakeholders, the team also focused a part of the presentation on private development. The presentation included numerous local examples of BMPs, and also included a "case study," presented by a developer, of how stormwater was treated through one of its projects. Developed Graphical Information System (GIS) Tool A GIS tracking tool was developed utilizing AutoCAD drawings of recently constructed GI practices in Watertown. The locations of the practices were brought into GIS and overlaid on the current aerial image. A BMP shapefile was created and each practice was digitized by adding a point in the middle of the practice. The latitude and longitude coordinates were identified and added to the attribute spreadsheet. The other attribute information (address, date installed, BMP type, owner and responsible party) was entered manually. The BMP Types listed have each been given a specific symbol that appears on the BMP GIS layer and included as part of the Town of Watertown GIS data. FID Shape • Address Latitude Longitude Date Installed BMPType Owner Responsible Party 0 Point 78 Eden fie l� Aveu n e 42.373231 -71.1931152017 Eloretention Town of Watertown Town of Watertown 1 Point 64 Eden fie l] Aven u e 42.372696 -71.1934252017 Bloretention Town of Watertown Town of Watertown 3 Point 37 Eden fled Aven u e 42.372166 -71.1936052017 Bloretention Town of Watertown Town of Watertown 4 Point 3341) Eden feed Aven u e 42.371771 -71.1938362017 Bloretention Town of Watertown Town of Watertown S Point 21 Eden feed Aven u e 42.371376 -71.1941942017 Bloretention Town of Watertown Town of Watertown 9 Point 1101112 Eden fed Aven u e 42.374133 -71.1926&42017 Bloretention Town of Watertown Town of Watertown 10 Point I i)WG5 Eden fed Aven u e 42.373731 -71.1926922017 Bloretention Town of Watertown Town of Watertown 12 Point Beacon Park 42.364433 -71.175031 2017 Bloretention Town of Watertown Town of Watertown 15 Point 655 Mou nt Au bu rn Street 42.371532 -71.156387 2017 Bloretention Town of Watertown Town of Watertown 11 Point Beacon Park 42.364415 -71.175053 2017 Sediment Forebay Town of Watertown Town of Watertown 13 Point 65 Grove Street 42.369455 -71.1537542017 Subsurface Drainage System Town of Watertown Town of Watertown 14 Point 65 Grove Street 42369099 -71.154725 2017 Subsurface Drainage System Town of Watertown Town of Watertown 2 Point 4&50- 57154 Eden feed Aven u e 42.372256 -71.1936882017 Tree Trench Town of Watertown Town of Watertown 6 Point 24 Eden feed Aven u e 42.371331 -71.194OW 2017 Tree Trench Town of Watertown Town of Watertown 7 Point 32 Eden fed Aven u e 42.371751 -71.1939872017 Tree Trench Town of Watertown Town of Watertown B Point 1301132 Eden fed Aven ue 42.374694 -71.1925792017 1 Tree Trench Town of Watertown ITDwn of Watertown Table 6: GIS Tracking Attribute Data 32 RESULTS As noted in the introduction, the overall goal of this project was to better position participating municipalities to implement low impact development (LID) and green infrastructure (GI) practices within their communities. The project accomplished this goal with both tangible and intangible outcomes. The tangible products listed below will assist the Town in planning community -wide LID/GI implementation, as well as prepare them to respond to good opportunities as they arise: • Identify where water quality improvements are most needed. The project team analyzed historical water quality (bacteria) information. Using GIS mapping tools, the projects generated maps showing the estimated annual phosphorus loading for each outfall. This information was used to identify high priority outfalls for water quality improvements. • Develop a list of potential green infrastructure projects. Soils and groundwater available from MassGIS data were analyzed to estimate general suitability of soils for green infrastructure to help focus implementation efforts on the most suitable areas. Using staff knowledge and input from stakeholders, a list of 22 sites were identified to target green infrastructure implementation. • Develop two pilot projects for green infrastructure implementation. Conceptual designs were created for two locations to carry through to final design and construction. • Embed green infrastructure techniques in the Town's decision making. Two community meetings were held to discuss green infrastructure that were attended by the general public as well as Town staff and volunteer members of several Town Boards and Commissions. The Town has already used the potential green infrastructure project list to partner with a local developer to construct green infrastructure at Beacon Park and to incorporate green infrastructure elements into its Common Street road reconstruction project. 33 CONCLUSIONS The Watertown Green Infrastructure Strategy Project succeeded in accomplishing its goal of determining where water quality improvements are needed and identified locations suitable for GI and where GI will be effective in removal of non -point source pollutant, specifically concentrating on Total Phosphorous. The process identified two potential pilot projects and developed 30% GI designs for both sites and has equipped Town staff, decision makers, and residents with the information, experience, and tools necessary to move forward with GI implementation in the future. The Town has already used the results of the process to implement two GI projects at Beacon Park and Common Street (planned) included in the list of potential high priority sites for future GI. At the conclusion of this project, the Project Partners developed two conceptual GI designs that can be carried out through to final design and implementation. Recommended next steps include completing topographic surveys and soils investigations, confirming utility locations, and initiating the permitting process (e.g. filing notice of intent). A GIS tracking tool has been developed allowing the Town to maintain a list of private and public GI projects constructed in Watertown. 34 Appendix 1 Horsley Witten Group Sustainable Environmental Solutions 294 Washington Street • Suite 801 • Boston, MA 02108 857-263-8193 • horsleywitten.com MEETING SUMMARY PROJECT: Watertown On -Call Services Task Order A DATE: November 24, 2015 LOCATION: Watertown DPW PRESENT: Gideon Schreiber (Planning), Pallavi Mande (CRWA), Dennis Sheehan (DPW), Matt Shuman (DPW), Jerry Mee (DPW), Gary Gonyea (MassDEP), Richard Claytor (HW), Janet Bernardo (HW) A meeting was held at the Watertown Department of Public Works to discuss the 604b and 319 Grants that the Town and HW are working on together. The following is a brief meeting summary that highlights the major items discussed. CIIMMARV For the 604b grant we discussed outfalls in town to prioritize, including: • Outfall 20: Pond, East Watertown • Outfall 11: Watertown Square and Common Street (largest) • Outfall 12: Arsenal Street • Outfall 8: Edenfield Ave, Weir Street • Outfall 4: Pleasant Street • Town has as-builts from last few years, paper copies of design plans from 20 years • Community Support/Watertown High School • Spring Street has lots of green space • Mt. Auburn Street — redesigning 4 lanes to 2 lanes with bicycle & turning, may be good location, some funds already in place • Corner rounding, bump out areas to gain green space, reduce cross walk lengths, has support from citizens. • Curbing and grass strip is coming back, may require city ordinance. • Concrete block — xblock to reduce some paved areas • Different options, grass pavers okay, concrete with permeable • Outfalls 20, 11, 12 have high bacteria count should be priority • Impervious cover, soils, high GW • Arsenal Street and Pleasant street coordinate • LiDAR from State, HW, Watertown — no sidewalk layer. LiDAR may be better. • Prioritize locations with GIS • Pilot projects — municipal properties, Auburn Street parking lot, fire station H:AProjects\2015\15145 Watertown On -Call G1\15145A G1 Master Plan\Reports\Final Report\Version 6 HW\Appendices\Appendix 1 151124_Meeting notes.docx Watertown Meeting November 24, 2015 2 of 2 • Rank 12 sites • Victory Field, School Admin Parking lot, Town Hall — done with infiltration trenches • Rain Gardens 120/140 Pleasant Street, 192 Pleasant St, in flood plain. Parking Garage floods? • Arsenal Mall • Althea Health —Stantec has master plan • Do not like —Trapelo Road in Belmont, deep swale, tall grasses • Common Street —tanks not great • Infiltration under garages — not favorite • Mt. Auburn Hospital — swales in median work well • Gideon to provide data • City in process of updating Watertown Pavement Management Plan. The above meeting summary constitutes the general understanding by Horsley Witten Group, Inc. of the meeting content. 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Tk,FT A fr I I I A I t A - A 1 4 I I I Horsley Witten Group Sustainable Environmental Solutions 294 Washington Street • Suf a 801 - Boston, MA 02108 857-263-8193 • horsleywitten.com MEETING SUMMARY PROJECT: Watertown 604b Grant DATE: March 17, 2016 LOCATION: Watertown DPW PRESENT: Gideon Schreiber (Planning), Matt Shuman (DPW), Jerry Mee (DPW), Janet Bernardo (HW) A meeting was held at the Watertown Department of Public Works to discuss the 604b Grant that the Town and HW are working on together. The three draft GIS maps created by HW were provided to the Town, the maps include: aerial of town, town parcels, catchment areas, and locations of outfalls, street names, water bodies, wetlands, drainage structures, topography, and AUL sites. Three other draft maps were provided that include the catchment areas, soils, and slopes greater than 15%. The following is a list of the potential areas chosen by the Town where green infrastructure practices may be considered. Potential Locations to be Investigated Further 1. Town library, Town Hall, Saltonstall Park (Town is investigating creating a campus, eliminating the road and relocating parking — separate design by others) 2. Main Street corridor between Waverley Avenue and Town Hall — bump outs, traffic calming 3. Chauncey Street and Boylston Street — roadway bump outs 4. Russell Avenue —similar to Edenfield Ave. improvements 5. Winsor Avenue —similar to Edenfield Ave. improvements 6. Boylston Street corridor — Porter Street and Nichols Ave intersection 7. Worcester Street & Springfield Street intersection 8. Grove Street & Kondazian Street intersection 9. Lowell School corner of lot at Orchard Street — possible bioretention, ledge may be issue 10. Arsenal Street & Beacon Park — connection being cut off by others, dead end. 11. Senior Center and Administration Building — large parking lot, changes to parking lot at intersection Spring Street and Common Street (drawing on wall DPW) 12. Common Street corridor & front lawn of Watertown High School 13. How(e) Park (dog park) — corner of Bacon Street and Pleasant Street 14. Police Station/552 Main Street/Brown School Playground @ Acton Street side 15. O'Connell Park/Boylston Street/Hosmer School — dirt parking lot (3 sites) 16. Westminster Avenue - similar to Edenfield Ave. improvements 17. Community Park/Middle School/Moxley Playground 18. Casey Park — south side of Charles River, near outfall 33/Laundry Brook 19. Main Street & Lexington Street — wide pavement area (State roadway?) H:\Projects\2015\15145 Watertown On -Call GI\Background and Research\160317_Meeting notes.docx Watertown Meeting March 17, 2016 2of2 One goal is to remove sediment before it reaches ponds that are near Target and Watertown Mall, which is within Catchment 20 Filippello Park off Arlington Street was a land fill — do not use Sullivan Playground/Coolidge School — do not use ACTION ITEMS/NEXT STEPS • HW to identify areas contributing highest NPS pollutant loads. • Town to provide list of other areas would like HW to consider. • Reconfigure maps to include the entire town. Do not need to highlight specific catchment areas but keep labels for the outfalls and catchment areas. • HW to evaluate areas discussed and will prioritize. • As a separate request Matt and Gideon would like an aerial map to be used at presentations that includes: o Aerial o Street Names o Town Boundaries o Town Buildings and public properties labeled per Gideon's GIS parcel layer o Map should be created so can be printed with entire town on three panels each (3' x 5' ) o Hoping to use an MBE/WBE for the printing and/or mounting The above meeting summary constitutes the general understanding by Horsley Witten Group, Inc. of the meeting content. Please advise this office of any errors or omissions. H:\Projects\2015\15145 Watertown On -Call GI\Background and Research\160317—Meeting notes.docx Appendix 3 Impervious Priority Area (acres) Outfall Catchment Potential Comments Regarding Public Watershed Initial Public Improvement No. Location Cost Maintenance Notes to Proposed Number Area BMP Potential BMP Visibility (11a, 11c, Ranking Design Comments BMP 20b 200 End of middle row parking use striped Potential: May be Bioretention space and second space. To capture parking lot runoff with abioretention incorporated into a whole 1A Library Parking Lot 0.34 11 11a Area area. High Medium Yes Low Low campus redesign. Potential: May be Grass area near side door, capture roof incorporated into a whole runoff need to cross walkwalk with 1B Town Hall 0.01 11 11 Rain garden runnel, depress area for bioretention. High Low No Low Low campus redesign. Tree Road narrowing design in Main St. betw Waverly Trenches and Town has conceptual design to narrow roadway, add bumpouts, reduce concept phase. Have 2 Ave. &Town Hall 0.85 11 11 Bioswales sidewalk and expand grass berm. High Medium No Low Medium design plan Mt. Auburn road design in Porter St./Boylston St. Bioretention Realign corner of Porter Street, steep road, expensive option, probably does progress. Have design 6 Intersection 0.55 20 20c Area not capture much area. Low High Yes Low Low plans, sheet 10 of 19. Worcester St./Springfield Small area to fit bumpout/bio would 7 St. Intersection 0.09 11 11c Rain garden need to redesign intersection. Low Medium Yes Low Low New water line Grove St./Kondazian St. Bioretention Flat area for new island/bio. Need to 8 Intersection 0.54 20 20b Area consider driveways. Low High Yes Low Low No Lowell School at Orchard Bioretention Nice, large grass area at corner. 9A St. and George St. 0.15 11 11c Area Capture runoff from George Street. High Low Yes Low High No Rain barrels at broken downspouts. 9B Lowell School 0.04 11 11C Rain Barrels Easy improvement High Low Yes Low High No Bioretention Developer closing off Beacon Park stub. Could capture portion of roadways and 10 Beacon Park at Arsenal St. 0.40 18 18 Area houses with bio. Medium Medium No Low Medium Developer redesigning Common St./Spring St. Bioretention Incorporate bioretention in Spring Have a design plan, the 12A Intersection 0.48 11 11e Area St/Common St island High Medium No Low High design is moving forward. Tree Trenches and Common street corridor being redesigned, bioswales may work well in Have a design plan, the 12B Common St. Corridor 0.45 11 11e Bioswales front of senior Center High Medium No Low Medium design is moving forward. Tree Common St./Orchard St. Trenches and Common Street corridor being redesigned, bioswales and Tree Have a design plan, the 12C Intersection 0.07 11 11e Bioswales Trenches may work well High Medium No Low Medium design is moving forward. Bioretention Grass area near front door parking area, relocate low point to capture all 15A Hosmer School Entrance 0.14 20 20c Area of parking lot. High Medium Yes Low Medium No Bioswale adjacent to playground near 15B Hosmer School 0.23 20 20c Bioswale dumpsters. Medium Medium Yes Low Low No Middle School Rear Parking lot rear of school, open curb at catch basin, create bio and oveflow to 17 Parking Lot 0.19 11 11a Bioswale 2nd lower curb. Medium Low Yes Low Medium No O'Connell Park - Parking Permeable Good opportunity for Permeable 20 Lot 0.12 20 20c Pavement Pavement. Medium High Yes Medium Low No Department of Public Bioretention Create bioretention area adjacent to handicap parking. Relocate two 21 Works 0.46 11 11C Area standard spaces. High Low Yes Low High No `y°a v hi/S n P ° ��< cP'f' Hurd Rd ha`N Rd Fresh tot. m oh ° IY �J q Selwyn S Pond fifr`. Iv1 ataes 5 ,Ot ;l to \ l 9� �r h Rd rF.,ratun o r� Ary Ra1et9 Rd Rd ,\c` Gyvetm°tend ch Sl a — k d Rd UmassCollege Comeila %i' tP ? a\n`tl C� x YN3(,Ntc t Rd geBp Of Agriculture Warren'' pv0- l Pequossette A Gheste =� rt Wo Oi Field Station FigldX eay eR`al ` l t\n9S Playground L Rd = w p 07 ' e ,\ S H It St LO o on v a Grove St Kingsley ' r St ``ace ° e pa/� Pa`i `' ° r p. Playground Park �1'' Rq dCzSt nNrtep' J Batl\edPQ° Pe reyR0 Gushing Ave Pq�. 4 IBBBN 00S R Clematis l Q� Qa h ee%ont o ,c, N a' to Hu+Onga t I'AFielde Brook Gtaa c o �� ? St u ,c u O Flm S D c d vr� c 0 r7 a Y Q= Ho c v Payson t Choate Rd Glacken � Station ze rn Q o Q ;Y c > r O a x on a a c o� Q c '`o e`` r < � v ✓, n heRq Try 3 Park Strawberry FpY1 II t\ut a s Q a Q> Maa`r� o 2 Q Q a o c •, Q ¢ n b% A Benton Rd < a [ietrii ,n Hill ? .0 Canq q �� yar/' �a4raais Q ,� Q o RO, o' Fair , _r ;11 ? t• t-5 i ° t ace cc .< S' o °n ru Hi/Ito a rn .c c m a /nr Pdark Z 7�3. v ew Ave m A ti o qve �� n ` qve Q u op lid o 0 0` a�� Z Z ` Park n y a T a m Ch Um S� o` Q L S U �r�t N o o 4t Unity t H;gh S� e n-3 v atlee ' °well qv qr Loc 4) ` ; gveo a Lawn S o o a o �7q qve re o d.3ela,n H e CO) e keSt Z m m < 0 `o` oP Q o �o Dra t ° y :.ma�rr CO .t O •• L, U D A ° atk e• o q 1._. ^ rey c Q +char o a r (n m` O 3 o y r n St :r+sh_ Q? m v �c qve y Fitc d S — r D iC Thin aAve c 3 A _ c � l+b t c� a gvall ° —° of 0 4 bur • is ° Gab.i y l t3 v y o c D c Country •' Ed D ° ev, A, _Z ge - MtAuburnCII ' h 0 Club ry c1_ olpQra ` ya o .,iva o a U eel% V ri v e n r�lt R+ch / qv \ e m m o m " uH _m„ o O Sevu 11 n l r+ e 9i�� ` �C Q \• ") Q fi r9hland a coo �� e Hd aplew �, p utP S jGG O o o qv 4c Z o t M - uh rn U UJ /� L'rctory o0 m l n 9 o ,y }� a� c Dii Pffsf Field '� � Fli+,tRd Q � ir dyf in N � p y " a Earn - o 4.p ton Qr pleasant St WhitneyNas-,'_; 0 C .y •� v yam. i�F Oa ' J?t'i• o ' o` Oc a� co ro v �rt h St �.` O c y �, sr4q Hill Park 4 grr n 'a �� IMAutuin a 3 a Zj i • 9ham 5t c to — m y r? q Qa O o °^. �e to S tone P\mot 4 F a tij U m e U. A O, Rq Q W Neigh R c 1,2 ' 1 a `mcRq� 4% 3 Oil Or xa y P Po < ` .1. y m W � +ti $ ?9 4: GA m �� \�-`--_----- Q�tSi 2`\ SN�� j� cOtunrbia St'F Auburn St . �'_': • East c 0M Jnd Aye�L' CO ct°n St t a -- 4j Py �r 1• —PO,1-4D ertown ; o Cad i meadow g c �cli ertifN+a Buyckt� O p c try �� 5� Q Vr a'1-3 r — Ni a Q D + qie 1 C < q C ern �P St Bemis z a, Sr dtonstall tee` 4ir �� ail o = hO/sgv 0 ford St a ° eOgv a9 c� QJ` �xh pi sf $\ t1 o tt, u Fairli �e W V Q' °n 1S iP �� A �� r' i`c ct� h Oh. " � - r \0 of r Coolyd v� C. qRd fat 9a Nra, ch �� • wn sf 0�' ae�4 sr s St ° el5 H qsi 01 9etk o�N y4 0 Sa Ps tc P i1' ° yF 2e �F e ° r of 611 eZ� ( s r �� 5� S `t`°Putnam St fsf OS� - o �e.f f 4� 3 Ebmenik Flippello P� 0) FoiL-u Park pleasant S� `'� d'� /h+ifs laurel St O u Playground f �r.`� o`n.. Cypress Ste 3v„ _ Ca!i!°rnr St California St enalSt De* n dNnSt,-I-Pty, -Nn 0 aeFran St O o 9/tlri°h Rd i on Ca ey - wd4e Pye w o: 4 i 9 Playground I oOSi,'OleY Ave R to Yg Union St P , St\ o� - --- _ Ar:enrd Arsenal St Nonantum J N Ft } i ro BO;c v Prol:ctct �y �ti a``�d ePJe C +otSt J Fi/ o� auryAve vvatertomn a \O� 3 G �7M -ai°+t0/ S t~�re/q D N�\ u a c o arrel gt w R9 st c Arsenal n y SChrl 0`\, aletlown i orSeSt NuntSf� ` Fare W:lY er"! L)IVU F�+rOJ J`Gti 1i oqF v�St Park Ida carte` r �• y• sf C�dryer S Y g�rsi Psfsf (e�gl pearl St t Gar o}ier S leton s °� .- .- - - s h, Leo M. /' e t e< < 'trle Link.. Legend 0Library Parking Lot O Worcester St./Springfield St. Intersection 0 Town Hall Q Grove St./Kondazian St. Intersection ©Main St. between Lowell School at Waverly Ave. & Town Hall Orchard St. OPorter St./Boylston St. Intersection Lowell School 0 Beacon Park at Arsenal St. it, Common St. Corridor isCommon St./Spring St. Intersection isCommon St./Orchard St. Intersection Hosmer School Entrance Hosmer School Middle School Rear Parking Lot ®i O'Connell Park - Parking Lot Document Path: H:IProjects1201505145 Watertown On -Call GIIGISIMapsO60616 FinalLocations.mxd Horsley Witten Group z> Sustainable Environmental Solutions ®90 Route 508-833[6600-h—rs yw-- Department of Public Works .r.,� N 0 1,250 I I 1" = 1,250 feet Candidate Sites Town of Watertown, MA Date: 6/20/2016 Draft I 2ft. Contours 1 " = 50 Feet I May i AdminisL Buildil 410 1f f 4(` i Watertown ` Library e V ' Town I Parking Town Library Parking Lot GROUNDCOVERI GRASSES ZONE 0'-b" HIGH CURB GRADE Location Library Parking Lot Id. No. 'IA Impervious Area 0.34 acres Public Visibility High Cost Medium Priority Watershed lies Maintenance Low PI Design in Process Potential Potential BMP Bioretention Area CANOPY TREE N PLANTING BED 25'-0" O.0 MN. REQUIRED 3'-0' HIGH SHRUBS STORMWATER INLETS SPACED AS APPROPRIATE 38'-0" TYPICAL INTERIOR LANDSCAPING PLANTING BED 2ft. Contours 1 " = 50 Feet I / 41 Administration Building ! -.. t Wa Y L r PF� Town Hall — Roof Runoff r�A Location Town Hall Id. No. 1 B Impervious Area 0.01 acres Public Visibility High Cost Low Priority Watershed No Maintenance Low PI Design in Process Potential Potential BMP Rain Garden RAIN GARDEN DETNL CilAl,740�G IN 11 Main Street Corridor Location Main St. betty Waverly Ave. & Town Hall Id. No. 2 Impervious Area 0.85 acres Public Visibility High Cost Medium Priority Watershed No Maintenance Low PI Design in Process Yes Potential BMP Tree Trenches and Bioswales rvrnre► cdac �- . �� "�li�llllllll� Illilll Porter St. @ Boylston St. Location Porter St. at Boylston St. Id. No. 6 Impervious Area 0.55 acres Public Visibility Low Cast High Priority Watershed Yes Maintenance Law PI Design in Process No Potential BMP Bioretention Area 2ft. Contours 1 50 Feet Jt 0 100, ''��_ 71 A6. I Worcester @ Springfield Location Worcester St. at Springfield St. Id. No. 7 Impervious Area 0.09 acres Public Visibility Low Cost Medium Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Fain Garden t axw wW mwrw wa - R N GARDEN DETAIL CiW.TiMG 2ft. Contours 1 " = 50 Feet L i i ' Ll low mom A 0 0 Grove St. @ Kondazian Location Grove St. at Kondazian St. Id. No. 8 Impervious Area 0.84 aces Public Visibility Low Cast High Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Bioretention Area VIA C I� r .: x:' _fir a .7 ! 70,VlftIroexoTa"Op4ove •ys Si ..i ,f �• ,t. •S, 2ft. Contours 1" = 50 Feet ~` d I AL _4 Lowell School Location Lowell School Id. No. 9B Impervious Area 0.04 acres Public Visibility High Cost Low Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Rain Barrels `� r Beacon Park @ Arsenal St. Location Beacon Park at Arsenal 5t. Id. No. 10 Impervious Area 0.4 acres Public Visibility Medium Cost Medium Priority Watershed No Maintenance Low PI Design in Process Yes Potential BMP Bioretention Area CANOPYTREE -IN PLANTING 9E0 Ox mim. REQUIRED GROUNDCOVERI 5'-0° HIGH GRASSES 70" SHRUBS ZONE f r _ t 0'-6" HIGH I CORE _ '%i.- .F1" ... GRADE VI STORMWATER INLETS SPACED AS APPROPRIATE 38'-0" TYPICAL INTERIOR LANDSCAPING PLANTING BED 2ft. Contours 1 - 75 Feet, �. Common St. @ Spring St. Location Common St. at Spring St. Id. No. 1 2A Impervious Area 0.48 acres Public Visibility High Cast Medium Priority Watershed No Maintenance Low PI Design in Process Yes Potential BMP Bioretention Area ioom 32 ` N� IN _ •A Jl 1 �1 • ■ 17 • \ • 38 t v �` 34 i Common St. Corridor Location Common St. Corridor Id. No. 12B Impervious Area 0.45 acres Public Visibility High Cost Medium Priority Watershed No Maintenance Low PI Design in Process Yes Potential BMP Tree Trenches and Bioswales irs 1" = 50 Feet _ - 7P y p - f . t r OR Ask Common St. @ Orchard St. Location Common St. at Orchard St. Id. No. 1 2C Impervious Area 0.07 acres Public Visibility High Cost Medium Priority Watershed No Maintenance Low PI Design in Process Yes Potential Bh�tP Tree Trenches and Bioswales 2ft. Contours 1" = 50 Feet --t ANINNW,` , 16 _. CONCORD ROAD Hosmer School Entrance Location Hosmer School Entrance Id. No. 1 5A Impervious Area 0.14 acres Public Visibility High Cost Medium Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Bioretention Area CANOPY TREE N PLANTING BED Z5,-0" O.0 MN. REQUIRED GROUNDCOVERI 3'-0' HIGH GRASSES SHRUBS ZONE 0'-b" HIGH CURB GRADE STORMWATER INLETS SPACED AS APPROPRIATE 38'-01, TYPICAL INTERIOR LANDSCAPING PLANTING BED I 2ft. Contours 1 " = 50 Feet I mom o '�IsomI Hosmer Elementary yOVA f" b—qqpAp-�l r&l tar ,_, Soft - A - -:® Hosmer School Location Hosmer School Id. No. 15B Impervious Area 0.23 acres Public Visibility Medium Cost Medium Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Bioswale I 2ft. Contours 1 " = 50 Feet I VON nj Middle School Rear Lot Location Middle School Fear Lot Id. No. 17 Impervious Area 0.19 acres Public Visibility Medium Cost Low Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Bioswale CANOPY TREE �IN PLANTING BED ZS'-0" Ox mim. REQVIRE❑ GROUNDCOVERI 5�-O° HIGH GRASSES SHRUBS ZONE r _ t 0'-6° HIGH I CURB GRADE STORMWATER INLETS SPACED AS APPROPRIATE 38'-0" TYPICAL INTERIOR LANDSCAPING PLANTING BED I 2ft. Contours 1 " = 50 Feet I LAW 68 O'Connell Park Lot Location O'Connell Park Parking Lot Id. No. 20 Impervious Area 0.12 acres Public Visibility Medium Cast High Priority Watershed Yes Maintenance Medium PI Design in Process No Potential BMP Permeable Pavement 2ft. Contours 1" = 50 Feet Department of Public Works 4 L DPW — Parking Lot Location Department of Public Works Id. No. 21 Impervious Area 0.46 acres Public Visibility High Cost Low Priority Watershed Yes Maintenance Low PI Design in Process No Potential BMP Bioretention Area REGUHT" CANOPY THE GRWACOYERIGRA$$ES ' CAR OVERHANG ZONE GRpuNpCtivFRIGRaSSES CAR OVERHAK ZONE 'SHRLBS zae+E -o•r TCX RFpuiRED :,.ONE S6WIG GEMX - A S' HIGH CURR WI BE LOw STGRMWaTER IHLE iS a PLANTING PARKING SOIL GRACE '�—HAAIMUi PONDING LIRE a-----------------------. GRAvZL FABRIC BASE PIPE CCNNECTEC TO 6' TO 6' PERFORATED PIPE ON -BITE STORT"ATER MmECTED TO GM -SITE SYSTEM B'-0' MINIM Iri STORMWATER SYSTEM Appendix 4 Green Infrastructure for a Healthier Charles River Impervious Priority Area (acres) Outfall Catchment Potential Comments Regarding Public Treated Watershed Initial Public Improvement No. Location Cost Maintenance Notes to Proposed Number Area BMP Potential BMP Visibility Impervious (11a, 11c, Ranking Design Comments BMP 20b 20c Lowell School at Orchard Nice, large grass area at corner. 9A St. and George St. 0.15 11 11c Rain Garden Capture runoff from George Street. High Medium Low Yes Low High No Department of Public Bioretention Create bioretention area adjacent to handicap parking. Relocate two 21 Works 0.46 11 11c Area standard spaces. High High Low Yes Low High No Common St./Spring St. Bioretention Incorporate bioretention in Spring Have a design plan, the 12A Intersection 0.48 11 11e Area St/Common St island High High Medium No Low High design is moving forward. Rain barrels at broken downspouts. 9B Lowell School 0.04 11 11C Rain Barrels Easy improvement High Low Low Yes Low High No Design plans not required Bioretention Grass area near front door parking area, relocate low point to capture all 15A Hosmer School Entrance 0.14 20 20c Area of parking lot. High Low Medium Yes Low Medium No Bioretention Developer closing off Beacon Park stub. Could capture portion of roadways and 10 Beacon Park at Arsenal St. 0.40 18 18 Area houses with bio. Medium High Medium No Low Medium Developer redesigning Tree Road narrowing design it Main St. betw WaverlyTrenches es an Town has conceptual design to narrow roadway, add bumpouts, reduce concept phase. Have p 2 Ave. &Town Hall 0.85 11 11 Bioswales sidewalk and expand grass berm. High High Medium No Low Medium design plan Tree Trenches and Common Street corridor being redesigned, bioswales may work well in Have a design plan, the 12B Common St. Corridor 0.45 11 11e Bioswales front of Senior Center High High Medium No Low Medium design is moving forward. Tree Common St./Orchard St. Trenches and Common Street corridor being redesigned, bioswales and Tree Have a design plan, the 12C Intersection 0.07 11 11e Bioswales Trenches may work well High Low Medium No Low Medium design is moving forward. Middle School Rear Parking Parking lot rear of school, open curb at catch basin, create bio and oveflow to 17 Lot 0.19 11 11a Bioswale 2nd lower curb. Medium Low Low Yes Low Medium No End of middle row parking use striped Potential: May be Bioretention space and second space. To capture parking lot runoff with abioretention incorporated into a whole 1A Library Parking Lot 0.34 11 11a Area area. High Medium Medium Yes Low Low campus redesign. Potential: May be Grass area near side door, capture roof incorporated into a whole runoff need to cross walkwalk with 1B Town Hall 0.01 11 11 Rain garden runnel, depress area for bioretention. High Low Low No Low Low campus redesign. Mt. Auburn road design in Porter St./Boylston St. Bioretention Realign corner of Porter Street, steep road, expensive option, probably does progress. Have design 6 Intersection 0.55 20 20c Area not capture much area. Low High High Yes Low Low plans, sheet 10 of 19. Worcester St./Springfield Small area to fit bumpout/bio would 7 St. Intersection 0.09 11 11C Rain garden need to redesign intersection. Low Low Medium Yes Low Low New water line Grove St./Kondazian St. Bioretention Flat area for new island/bio. Need to 8 Intersection 0.54 20 20b Area consider driveways. Low High High Yes Low Low No Bioswale adjacent to playground near 15B Hosmer School 0.23 20 20c Bioswale dumpsters. Medium Medium Medium Yes Low Low No O'ConnellPark- Parking Permeable Good opportunity for Permeable 20 Lot 0.12 20 20c Pavement Pavement. Medium Medium High Yes Medium Low No Tree trenches may work well in parking Y) Baptist Walk 11 11a I Tree Trench larea island. High Low Medium Yes Low Low No Watertown Stormwater Advisory Committee September 15, 2016 Jy/s° nP a �dy cP,Qp Hud rd Rd S1�av+ Rmesh t. m h ° 10 C si Set 7Je`,t:1 c SS .t 7 m 9� �fe nF0 Selwyn Rd ` t¢Rd vond / atp¢. �0,< ' �� ,\1ST e� m` A Ra\etg rt, Livecm° c4r_n 6 C/ ,, 7 H cat ° q a p Rd d UmassCollege Comeila• cP ?. �alr�tl watWick ter Rd 'o Bet�R OfAgricukure aVarrFn a Pv¢ Pequossette A Ches `Z 1=' Wo 91� / Field Station Fi�lf1 edyNr G\e��3t`� eSt itolt St ^� ,\(%(l P1ayground L n Rd = 14 4 0�Kingsley �✓/ 0 0 ° Grove St r S/ p 3° tst 51 Fsl Av¢ pd/>� Qay' a r o. Playground Park �1n r 1Yi1b� �j� .em. att\¢tt i ' eYRa Gushing Ave A f. 4 ! t386N Rpak` Rd Clematis Qa a`ee/h7or o y N Q to `A yurOn 9 /AFi.1, Brook Gtaa� .� oy �� co � Of) g -, u O Elm St N ; 3 Station 2 Qd u o Q� ;� o D Y a > Hot.17— O a Payson Choate Rd Glacken �on �` o .o a `F r t7 e T Park FwH 1{itt D D ry a�'° �' _� e r a c Ra>.0 3 Strawberry n I D a Q a D Ma c h a Q Q `� a Q t a N/0 A Benton Rd < Bern „nt Hill 3 n 4 .o aM o ° 'S' o erriat-i St N c Cantla 4 c°'� yaJ.ir darso' �, �, rq a n'' Q 4 In ry Pay on Fairview Ave ,� ,N s a F o` eAv �� <p y qve ltop Rd o d� m o z Park m v> n n n o 14 me c r ', r N N o Crni High S1 sf .c v ha! V a Lower 9 3 ° Y L1 tY Aver Q Lawn St a c� @ o�C lee AvN �� dgwlavn H 1 Ave y �N LOcke St Z `m °c o` �a oP Q o �o e ZO a emery 4 C tv _ O Q rn a a a U. a m p atk c• o a n St rsh c �c d reygve �` F,tc/,zr bu/card Sl 0 x a � o e O 1'hingvalla Ave ?c ? � Dr' o SV o <n r9 S! • r a C. y r Corp l ` r O .a°j C m c c W re to` J �` G rlubr (ry [dgNci !;r ,i ; Mt Auburn ti 0 R/ �idl b.`. �• �h C O :� D ° a QNi ® U 8e% cy d�'9 qvv ��ro '•;� .° 4r—v a O�ru ;�__ -`QmZuhw h/ahC s cO / Svti d »Am t Q shoco c m CY e fi G1 At Mapt Coo co o �� J N U Y wootlu t-Gore 7 Fie HFlintHd m yLs/ N po QEstae U 41 sj r, Q < PC, 11 - 3d Ptoh Qr p/Nasaht St • ro ¢ c P ` �� bVhitne v 0 N ° Nds -zi ? O c y � -4 h Od Y �?ri o Q o` o N h •+ d S Hill Park rs � P a St ``'`(� t \° ` /4q 'tf �. 17 Q,Br, gham St C — �l ,. t,ltAubum m 3 a O a, •>� �N o _em�t�r t a b a y .. - ,• k q .o, Ra ^ Q tj Store /sigh RD 2 - v N 3 9 P N 312 _ 1 4 i cRq aI�` 3 O/. N a v m " < c Fy c ci .c �. .L` N/ N u, a W eti o` �A D �� oeS `\ ys/ CO/rrr c East ° n dAye4� A m A ii ��--_--_- Q� /Z �� 5� hbiaS y Auburn St.." • O Cad 0i� r �o _c C7 ctOn St v a _ _ �y or ® t �cQ _pots¢ atertown Q N dow o 1'///, BurCk� 0 0 3 �gr� �� ` Q�� (,ram '!i' Q - - Al,ac Q ➢ N/aR �4", 9iV 1 '4d o o oc CO �i e. S s d r, o� G 'o ch O/ c m a CN Ave m e1 St Bemis r ^ ti Jtonstall j p� �� is ? r SgvN o ,3wford St a q n� 0 c� �` o u F W Cr 4 op 1 s e a, i`c F5 t1� O. t 4 i tu> airliN/o u� ➢ Cooltd �� 0 and /ai yy led c� �. • W n s/ 5Q no 4 �� v �, !Sl ¢� `' H s/ p1 �. ee N o� q4 rn sdn/ es PJ �ij •� �. Jr 'fi. �cv oytt` rN/ J�F v Putn am S t si O S �' 0 o S / av DorrIenik Flippelb �0. 0 Fore axO N Playground !, Pleasant Laurel St 2 Park St \ ® �c'o �/S/ r..v,,:_ `ti _ Cypress Ste Ca!i!ornr St Cahena! St fornia St /� - -- - _- �De*%r, la gel n, ¢Pye 9) ow, St a = tert... cn 3 ��a� N �a`¢t i'I, R a Frank St -- t.1..It �' Gpo qri m ��S 4N y 9/drich Rd �y rYNr m o, rn SraNS VGA -_ �!_ _ Woore Y Ave ti - i N Playground Unlon St ' S `� p�' �7 ___ _ ___�_ Ars.en al ArS en al St eeac�r_s 5` p� �E tcXa Nonantum :n Fli of �? o ° y Protector r` tlu a� Ga S t F C apilo!st ` f rlrN/a o c C. .. ry Ave Watertown or y • 3� \awe Can St q °rs o, Sl �'i'Nunt51 ^' 0 Arsen:' ,\\` 50\ m 'i pall y� ,-.nl 5` at¢ttoW n o i .- OAS/ eSt „h n �� Parr. vtcI 141 e 1n .41 Park Mai, -.- s/ cSt S/ pear/ St Garin 5 c °rSt r'harle:, 51 <ee �tleton a<So .Leotvo_Lines... Legend 0Library Parking Lot O Worcester St./Springfield St. Intersection 0 Town Hall Q Grove St./Kondazian St. Intersection ©Main St. between Lowell School at Waverly Ave. & Town Hall Orchard St. OPorter St./Boylston St. Intersection Lowell School 0 Beacon Park at Arsenal St. it, Common St. Corridor isCommon St./Spring St. Intersection isCommon St./Orchard St. Intersection Hosmer School Entrance Hosmer School Middle School Rear Parking Lot ®i O'Connell Park - Parking Lot Document Path: H:IProjects1201505145 Watertown On -Call GIIGISIMapsO60616 FinalLocations.mxd Horsley Witten Group Sustainable Environmental Solutions ® 90 Route `600h—rs y,i--m 'a Department of Public Works 5088336 ® Baptist Walk N 0 1,250 I 1 1" = 1,250 feet Candidate Sites Town of Watertown, MA Date: 9/8/2016 Draft Jy/s° nP a �dy cP,Qp Hud rd Rd S1�av+ Rmesh t. m h ° 10 C si Set 7Je`,t:1 c SS .t 7 m 9� �fe nF0 Selwyn Rd ` t¢Rd vond / atp¢. �0,< ' �� ,\1ST e� m` A Ra\etg rt, Livecm° c4r_n 6 C/ ,, 7 H cat ° q a p Rd d UmassCollege Comeila• cP ?. �alr�tl watWick ter Rd 'o Bet�R OfAgricukure aVarrFn a Pv¢ Pequossette A Ches `Z 1=' Wo 91� / Field Station Fi�lf1 edyNr G\e��3t`� eSt itolt St ^� ,\(%(l P1ayground L n Rd = 14 4 0�Kingsley �✓/ 0 0 ° Grove St r S/ p 3° tst 51 Fsl Av¢ pd/>� Qay' a r o. Playground Park �1n r 1Yi1b� �j� .em. att\¢tt i ' eYRa Gushing Ave A f. 4 ! t386N Rpak` Rd Clematis Qa a`ee/h7or o y N Q to `A yurOn 9 /AFi.1, Brook Gtaa� .� oy �� co � Of) g -, u O Elm St N ; 3 Station 2 Qd u o Q� ;� o D Y a > Hot.17— O a Payson Choate Rd Glacken �on �` o .o a `F r t7 e T Park FwH 1{itt D D ry a�'° �' _� e r a c Ra>.0 3 Strawberry n I D a Q a D Ma c h a Q Q `� a Q t a N/0 A Benton Rd < Bern „nt Hill 3 n 4 .o aM o ° 'S' o erriat-i St N c Cantla 4 c°'� yaJ.ir darso' �, �, rq a n'' Q 4 In ry Pay on Fairview Ave ,� ,N s a F o` eAv �� <p y qve ltop Rd o d� m o z Park m v> n n n o 14 me c r ', r N N o Crni High S1 sf .c v ha! V a Lower 9 3 ° Y L1 tY Aver Q Lawn St a c� @ o�C lee AvN �� dgwlavn H 1 Ave y �N LOcke St Z `m °c o` �a oP Q o �o e ZO a emery 4 C tv _ O Q rn a a a U. a m p atk c• o a n St rsh c �c d reygve �` F,tc/,zr bu/card Sl 0 x a � o e O 1'hingvalla Ave ?c ? � Dr' o SV o <n r9 S! • r a C. y r Corp l ` r O .a°j C m c c W re to` J �` G rlubr (ry [dgNci !;r ,i ; Mt Auburn ti 0 R/ �idl b.`. �• �h C O :� D ° a QNi ® U 8e% cy d�'9 qvv ��ro '•;� .° 4r—v a O�ru ;�__ -`QmZuhw h/ahC s cO / Svti d »Am t Q shoco c m CY e fi G1 At Mapt Coo co o �� J N U Y wootlu t-Gore 7 Fie HFlintHd m yLs/ N po QEstae U 41 sj r, Q < PC, 11 - 3d Ptoh Qr p/Nasaht St • ro ¢ c P ` �� bVhitne v 0 N ° Nds -zi ? O c y � -4 h Od Y �?ri o Q o` o N h •+ d S Hill Park rs � P a St ``'`(� t \° ` /4q 'tf �. 17 Q,Br, gham St C — �l ,. t,ltAubum m 3 a O a, •>� �N o _em�t�r t a b a y .. - ,• k q .o, Ra ^ Q tj Store /sigh RD 2 - v N 3 9 P N 312 _ 1 4 i cRq aI�` 3 O/. N a v m " < c Fy c ci .c �. .L` N/ N u, a W eti o` �A D �� oeS `\ ys/ CO/rrr c East ° n dAye4� A m A ii ��--_--_- Q� /Z �� 5� hbiaS y Auburn St.." • O Cad 0i� r �o _c C7 ctOn St v a _ _ �y or ® t �cQ _pots¢ atertown Q N dow o 1'///, BurCk� 0 0 3 �gr� �� ` Q�� (,ram '!i' Q - - Al,ac Q ➢ N/aR �4", 9iV 1 '4d o o oc CO �i e. S s d r, o� G 'o ch O/ c m a CN Ave m e1 St Bemis r ^ ti Jtonstall j p� �� is ? r SgvN o ,3wford St a q n� 0 c� �` o u F W Cr 4 op 1 s e a, i`c F5 t1� O. t 4 i tu> airliN/o u� ➢ Cooltd �� 0 and /ai yy led c� �. • W n s/ 5Q no 4 �� v �, !Sl ¢� `' H s/ p1 �. ee N o� q4 rn sdn/ es PJ �ij •� �. Jr 'fi. �cv oytt` rN/ J�F v Putn am S t si O S �' 0 o S / av DorrIenik Flippelb �0. 0 Fore axO N Playground !, Pleasant Laurel St 2 Park St \ ® �c'o �/S/ r..v,,:_ `ti _ Cypress Ste Ca!i!ornr St Cahena! St fornia St /� - -- - _- �De*%r, la gel n, ¢Pye 9) ow, St a = tert... cn 3 ��a� N �a`¢t i'I, R a Frank St -- t.1..It �' Gpo qri m ��S 4N y 9/drich Rd �y rYNr m o, rn SraNS VGA -_ �!_ _ Woore Y Ave ti - i N Playground Unlon St ' S `� p�' �7 ___ _ ___�_ Ars.en al ArS en al St eeac�r_s 5` p� �E tcXa Nonantum :n Fli of �? o ° y Protector r` tlu a� Ga S t F C apilo!st ` f rlrN/a o c C. .. ry Ave Watertown or y • 3� \awe Can St q °rs o, Sl �'i'Nunt51 ^' 0 Arsen:' ,\\` 50\ m 'i pall y� ,-.nl 5` at¢ttoW n o i .- OAS/ eSt „h n �� Parr. vtcI 141 e 1n .41 Park Mai, -.- s/ cSt S/ pear/ St Garin 5 c °rSt r'harle:, 51 <ee �tleton a<So .Leotvo_Lines... Legend 0Library Parking Lot O Worcester St./Springfield St. Intersection 0 Town Hall Q Grove St./Kondazian St. Intersection ©Main St. between Lowell School at Waverly Ave. & Town Hall Orchard St. OPorter St./Boylston St. Intersection Lowell School 0 Beacon Park at Arsenal St. it, Common St. Corridor isCommon St./Spring St. Intersection isCommon St./Orchard St. Intersection Hosmer School Entrance Hosmer School Middle School Rear Parking Lot ®i O'Connell Park - Parking Lot Document Path: H:IProjects1201505145 Watertown On -Call GIIGISIMapsO60616 FinalLocations.mxd Horsley Witten Group Sustainable Environmental Solutions ® 90 Route `600h—rs y,i--m 'a Department of Public Works 5088336 ® Baptist Walk N 0 1,250 I 1 1" = 1,250 feet Candidate Sites Town of Watertown, MA Date: 9/8/2016 Draft Places Sought to Install Green Infrastructure to Cut Storrawater Going to River I Waterto... Page 1 of 2 BABIGI WMert Real Estate Closings — . 617.926.2112 • vash "It's All Aboul Watertown News I (http://—.watertownmanews.com/2o16/o6/22/places-sought-to-install-green-infrastructure-to-cut-stormwater-going-to-river/) Places Sought to Install Green Infrastructure to Cut Stormwater Going to River By Charlie Breitrose I June 22, 2016 Watertown Realtor@ (/ /ad.broadstreetads.com/click/5a8a8/ca63es/zi7397) r ' ;F+ 0 (D G9 4.. D Charlie Breitrose A map showing the proposed Green Infrastructure projects around Watertown. Spots around town are being considered to put "green infrastructure" projects that will reduce the amount of rain runoff going into the storm sewers and eventually into the Charles River. Tuesday night, consultants working with the town presented more than 20 options for places on town -owned property where project such as rain gardens, tree trenches that collect stormwater or permeable pavement can be installed. The efforts grew out of the town's need to meet new, more stringent stormwater regulations from the federal government, which requires the town to reduce the amount of pollutants, such as nitrogen and phosphorus, going into the river. The water going into storm drains does not get treated before going into the river. Interested residents filled the Town Council chamber to hear more about the effort. Janet Bernardo, an engineer with Horsley Witten Group presented 21 projects. Some projects received more weight because they would handle water from a large catchment area, they are in an area with large amounts of stormwater, or are in an area slated to be part of an upcoming project. Two projects will be chosen as pilots for green infrastructure, and another important factor is that the project be visible, said Richard G7aytor, president of Horsley Witten. "We need to make it visible so people can see it and try to get the ball rolling (on other projects)," Claytor said. The proposed projects are located at town buildings, schools, parks and on streets around town. Common Street has a three proposed projects, including turning the traffic island at Common and Spring streets into a bioretention area, where water will run down into and slowly percolate into the ground. Several people got behind this idea. "It is great to see Common Street on the list because it is undergoing a huge renovation project," said Town Councilor Lisa Feltner. "Just about everyone at one point gets on Common." 7/8/2016 Places Sought to Install Green Infrastructure to Cut Storrawater Going to River I Waterto... Page 2 of 2 Bernardo had high hopes for a smaller bioretention area in the parking lot behind the Watertown Free Public Library, but the town may be redesigning the area to make the library, Town Hall, and other facilities into more of a campus, she said. Lowell School has a few places where green infrastructure could be used, including something simple like putting rain barrels under gutter downspouts or more a more complex undertaking like a a bioretention area at the bottom corner of the playing fields (at the corner of Orchard and George Streets). Other schools had potential projects. One was a bioswale in the rear parking lot at Watertown Middle School, where stormwater goes into a vegetated strip. Hosmer School has a spot near the main entrance where a bioretention area could go, and take in water from the surrounding driveway. Councilor Tony Palomba said he would like to see a project at a school and hopes it could be used to teach students about stormwater and other subjects. It could have other benefits. "It might open up more opportunities for grants," Palomba said. An area that seems perfect for a bioretention area is the spot where Beacon Park hits Arsenal Street. The entrance will be closed off, and developers of the apartments at 202-204 Arsenal St. have agreed to pay for work there. Bernardo said it could collect water from Beacon Park. Another bioretention area could be placed in the parking lot at the Department of Public Works facility, too. Some projects that did not rank well include projects at intersections around down, such as Porter Street/Boylston Street, Grove Street/Kondazian Street, and Worcester Street/Springfield Street. These area shad large intersections, but are either tricky to make work or would need major changes to the intersection, Bernardo said. 7/8/2016 Stormwater Committee to Choose Sites for Green Infrastructure Projects I Watertown News Page 1 of 1 #1 Selling Waterto,N n Realtor for 10+ Years 617-799-8948EE)(ECUTZIVES Ari Koufos ari@arikoufos.com Broker/Owner www.arikoufos.com Watert� Support Your Local I S�irrg8larg Donate to Watertown NE .,., — —a, ontinue Daily Coverage of Watertown News I (http://-.watertownmanews.com/2o16/09/13/stormwater-committee-to-choose-sites-for-green-infrastructure-projects/) Stormwater Committee to Choose Sites for Green Infrastructure Projects By Charlie Breitrose 15 hours ago ATR Watertown Realtor@ .fI I2 <15I r1 N (iavascript:void(o)) ..r i -: p m LgI.P �r�W wwn CMaq� Sites of the proposed green infrastructure projects being considered by the StormwaterAdvisory Committee. The Stormwater Advisory Committee will discuss which projects to choose as the pilot projects for stormwater, green infrastructure projects. In June, the committee hosted an event where consultant Horsley Witten Group presented 22 options for the projects, which were ranked on their ability to absorb stormwater, their visibility and their cost. The committee will meet on Thursday, Sept. 15, at 4 p.m. in the DPW Facility, 124 Orchard St., Watertown. At the meeting they will pick the two projects to recommend to pursue first. See the presentation made by the consultants at the June 21 meeting by clicking here (htto://www.waterownduw.ore/Paees/Stormwater% 2omemt%2omise%2omfo/So2xrsAcs-o2nnns,o.a/June%2o2s%2ocreen%2omfrastmu re%2oPresentationmdf). Watch a video of the meeting on Watertown Cable by clicking here No, //wcatv.or2/vod/storm-Watertown-advisory-commineen . Read more about the June meeting here: Places Sought to Install Green Infrastructure to Cut Stormwater Going to River (hfD://www.waterto ma,e .WM/2016/o6/22/places-,oueht- to-install-Breen-infraetrucmre-to-cut-etormwater-going-to-mer 9/13/2016 Two Spots Chosen for Demonstration Stormwater Retention Projects I Watertown News Page 1 of 1 #1 Selling Watertown Realtor for 10+ Years 617-799-8948EE)(ECUTZIVES Ari Koufos ari@arikoufos.com y Broker/Owner www.arikoufos.com Watertown Support Your Local Z Banking like it's supposed to be. SavingsBank � _� Donate to Watertown SEE A" Continue Daily Coverage of Watertown News I (http://—.watertownmanews.com/2ol6/09/3o/two-spots-chosen-for-demonstration-stormwater-retention-projects/) Two Spots Chosen for Demonstration Stormwater Retention Projects By Charlie Breitrose I September 30, 2016 Watertown Realtor@ avascrint:void(o The Department of Public Works building and Hosmer Elementary School will have new installations that drain rainwater into the ground, rather than the town's storm drains, and will serve as demonstration projects for what can be done around town. The search started with 22 potential sites for the demonstration projects, but that was cut down to 18 viable sites on property owned or controlled by the town. The Watertown Stormwater Advisory Committee met in September to pick two locations for the project. The group wanted to spots that would drain a significant area, be visible to the public and be located in different parts of town. The last criterium was the one that led to the Hosmer School location being chosen. The top two choices were in the parking lot of the DPW facility, and a spot at the bottom of the hill beneath Lowell Elementary School. Those two locations are right across Orchard Street from each other, however. The DPW location, which would replace two or three parking spots with a small rain garden, is not right on the street like the Lowell School location, but it would be seen by people going to the DPW. This would include some key people who might install such stormwater features — developers. "At first, with the DPW I thought, who would see it, but if developers see it, that's big. That's important," said Stormwater Advisory Committee member Janet Buck. The group then looked for other locations in an area away from the DPW and chose Hosmer School instead. The spot at the school was not originally the top one on that campus. Assistant Town Manager Steve Magoon said the first location in the circle in the driveway in front of the school, where a rain garden could be placed, had some drawbacks. "With Hosmer, our concern being an area of high foot traffic that it would be walked on and not last six months," Magoon said. Instead, the group chose a location in back of the school on the edge of the parking lot near the playground. Hosmer was chosen over other locations, including Common Street and Beacon Park, just off Arsenal Street. Town Engineer Matt Shuman said Common Street is about to undergo reconstruction, and the grassy area at the intersection with Spring Street would be altered, so he recommended against this location. Beacon Park is a good location, the group decided, and it might be able to be done by the developer of the apartment building going up across Arsenal Street as part of the project mitigation. Consultants Horsley Witten will design the projects to the 30 percent design. Then the projects will be ready to be funded and built. 1 0/6/20 1 6 Appendix 5 C. On -Site Review Deep Observation Hole Number: TP1 30-Dec-16 8:30 a.m. to 9:30 a.m. Sunny 35 degrees a�Fe -VTea er 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Corner Katherine Rd & Church St, Watertown. Within berm, adjacent to sidewalk. 2. Land Use: Residential nei hborhood None 3 - 8% e.g. woo a , n agricu ura ie , vacan o , e c. Surface Stones Slope o lawn within vicinity of test pit adwaLow oi9t Ve�aion an orm oson ansocae c see 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. feet feet feet Property Line —5 ft. Drinking Water Well >100 ft. Other eel feet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material ❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 7 ft. 0 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 1 of 6 Deep Observation Hole Number: TP1 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) Moist Depth Color Percent Gravel Cobbles & Stones 0-4 A/B - Fill/Subbase Course Hole firm, was not 4-84 C1 10 YR 3/3 _ SAND 35 35 Platy Very Friable in caving Additional Notes No water observed, no mottling within hole, sand/gravel consistent throughout No large stones, roots to approximately 24". Location side yard of #163 Church Street Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 2 of 6 C. On -Site Review Deep Observation Hole Number: TP2 30-Dec-16 9:30 a.m. to 10:00 a.m. Sunny 35 degrees Mate Time ea er 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Corner Katherine Rd & Common St, Watertown. Within roadway, adj. to sidewalk. 2. Land Use: Residential nei hborhood None 3 - 8% e.g. woo a , n agricu ura ie , vacan o , e c. Surface Stones Slope o lawn within vicinity of test pit Hi h end of Katherine, shoulder edge of Common St eV�aTion an orm osi ion on an scape (anacn see 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. eT er- feet feet Property Line —10 ft. Drinking Water Well >100 ft. Other eel feet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material ❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 5 ft. 0 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 3 of 6 Deep Observation Hole Number: TP2 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) Moist Depth Color Percent Gravel Cobbles & Stones 0-3 A asphalt - 3-14 B fill - subbase to roadway 14-60 C 10YR 4/3 SL 35 35 Granular Friable Coarse gravel at bottom. Refusal at 60" Additional Notes No water observed, no mottling within hole, refusal at bottom Thin clay layer at 30". Address: corner of 92 Common Street Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 4 of 6 C. On -Site Review Deep Observation Hole Number: TP3 30-Dec-16 10:30 a.m. to 11:00 a.m. Sunny 35 degrees a�F weather 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Hosmer School across from 46/48 Hancock Street 2. Land Use: Elementary School None 0 - 3% e.g. woodland, agricultural field, vacant lot, etc.) Surface Stones Slope o lawn within vicinity of test pit Low oint of dro off/ arkin lot eV�a�ion an orm7371T,on on an scape a ac see 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. eT e7- feet feet Property Line —5 feet Drinking Water Well >100 ft. Other eel feet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material ❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 7 ft. 0 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 5 of 6 Deep Observation Hole Number: TP3 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) Moist Depth Color Percent Gravel Cobbles & Stones 0-4 A - Loam 4-16 B Subsoil 16-84 C 10YR 4/4 LS 35 35 Platy Friable No stones>10" Additional Notes No water observed, no mottling within hole, sand/gravel consistent throughout No large stones, grassroots observed, no ledge Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 6 of 6 C. On -Site Review Deep Observation Hole Number: TP4 26-Jan-17 8:30 a.m. to 9:30 a.m. Clear45 degrees a�F me ea er 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) DPW parking lot. 124 Orchard Street, Watertown, MA 2. Land Use: parkin lot None 0% - 3% e.g. woo an , agricu ura ie , vacan o , e c. u ace Stones Slope o landscAe shrubs L000inwithn rkoet eVea an orm w oanca 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. eT e7- feet feet Property Line >100 ft. Drinking Water Well >100 ft. Other eel eet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material X❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 4 ft. 0 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 1 of 8 Deep Observation Hole Number: TP4 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) (Moist) Depth Color Percent Gravel Cobbles & Stones 0-6 Asphalt Parking lot 6-15 subbase Subbase 15-36 C1 10YR 5/3 SiL 0% 0% massive firm in place fine sand silt loam, no roots, no stones 36-42 C2 2.5Y 6/2 SiCL 0% 0% massive firm in place clay layer, no roots, no rocks 42-48 C3 10YR 5/3 48" 7.5YR 4/6 >50% SiL 30 10 Platy firm in place 48-84 C4 10YR 4/4 Sand 30 10 Platy loose Additional Notes No water observed, mottling @ 48", may be perched water table. Layer of clay No large stones, no roots Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 2 of 8 C. On -Site Review Deep Observation Hole Number: TP5 26-Jan-17 9:30 a.m. to 10:00 a.m. Clear45 degrees Date Time Weather 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Island at intersection Common and Spring Street near Middlesex Road 2. Land Use: Residential nei hborhood None 3 - 8% e.g. woo an , agncu ura ie , vacan o , e c. u ace Stones Slope o lawn within vicinity of test pit Toe of slo e - Common St eV�a n an orm osi ion on an scape (anacn see 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. feet feet feet Property Line —5 ft. Drinking Water Well >100 ft. Other eel feet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material X❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 7 ft. 0 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 3 of 8 Deep Observation Hole Number: TP5 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) Moist Depth Color Percent Gravel Cobbles & Stones 0-4 A - grass/loam 4-42 B fill - appears to be fill - clean fine sand coarse sand and 42-84 C 10YR 3/2 - Sand 15 15 Platy Loose gravel, roots to 52" no mottles Additional Notes No water observed, no mottling within hole Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 4 of 8 C. On -Site Review Deep Observation Hole Number: TP6 26-Jan-17 10:00 a.m. to 10:30 a.m. Clear45 degrees a�F weather 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Island at intersection Common and Spring Street near Marion Road 2. Land Use: Residential nei hborhood None 3 - 8% e.g. woo an , agricu ura ie , vacan o , e c. u ace Stones Slope o lawn within vicinity of test pit Toe of slo e - Common St eV�a�ion an orm osi ion on an scape (anacn see 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. feet feet feet Property Line -5 ft. Drinking Water Well >100 ft. Other eel feet 4 Parent Material: Unsuitable Materials Present: Yes No QX If Yes: Disturbed Soil Fill Material X❑ Impervious Layer(s) Weathered/Fractured Rock Bedrock 5 Groundwater Observed: Yes No �X If Yes: Depth Weeping from Pit N/A Depth Standing Water in Hole Estimated Depth to High Groundwater: 5 ft. 10 in. inches elevation DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 5 of 8 Deep Observation Hole Number: TP6 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) Moist Depth Color Percent Gravel Cobbles & Stones 0-4 A - grass loam appears to be fill - 4-36 B fill - - clean fine sand, roots to 36" 36-96 C 10YR 5/3 70" 10YR 5/8 >30% SL 20 20 granular slightly firm Fine sandy loam in place Additional Notes No water observed, mottles @ 70" Soil Evaluator: Janet C. Bernardo DEP Form 11 Soil Suitability Assessment for On -Site Sewage Disposal Page 6 of 8 C. On -Site Review Deep Observation Hole Number: TP7 26-Jan-17 10:30 a.m. to 11:00 a.m. Clear45 degrees Date Time Weather 1. Location Ground Elevation at Surface of Hole Location (Identify on Plan ) Island at intersection Common and Spring Street across from High School 2. Land Use: Residential neighborhood None 3 - 8% (e.g. woodland, agricultural field, vacant lot, etc.) Surface Stones Slope (%) lawn within vicinity of test pit Toe of slope - Common St Vegetation Landform Position on landscape (attach sheet) 3. Distances from: Open Water Body >100 ft. Drainage Way > 100 ft. Possible Wet Area > 100 ft. feet feet feet Property Line --5 ft. Drinking Water Well >100 ft. Other feet feet 4 Parent Material: Unsuitable Materials Present: Yes ❑ No �X If Yes: Disturbed Soil ❑ Fill Material X❑ Impervious Layer(s) ❑ Weathered/Fractured Rock ❑ Bedrock ❑ 5 Groundwater Observed: Yes ❑ No �X If Yes: Depth Weeping from Pit N/A Estimated Depth to High Groundwater: 4 ft. 6 in. inches Depth Standing Water in Hole elevation Deep Observation Hole Number: TP7 Depth Soil Soil Matrix: Redoximorphic Features Soil Coarse Fragments Soil Structure Soil Other (In.) Horizon/ Color -Moist (mottles) Texture % by Volume Consistence Layer (Munsell) (USDA) (Moist) Depth Color Percent Gravel Cobbles & Stones 0-4 A grass loam 4-32 B fill 2 0 appears to be fill - clean fine sand, 32-53 C1 10YR 5/6 - - Sand 20 0 granular loose Sand and gravel, no cobbles, stones, rocks 53-84 C2 10YR 3/6 54" 7.5YR 4/6 >30% Sand 20 20 granular loose mottles @ 54" Additional Notes No water observed, mottles (a) 54" Soil Evaluator: Janet C. Bernardo II I I r) FL L0 0 L 9 - El C� Q Lf') 77 El El O LO LO 77 LO T_ O El El El El L ti ti N C'7 CD L7 ti ti N M OFj ■ ■ FRL FLOOR EL-E4.30 ,P 9.9 pe o 0 .9 O �\ O 6t]'6 / a„o .wc x OFIN9 62.8] I EL FLOOR YP-S&J I\ EL-61.30 e "ago 61.1 8 ` m#LPL WATERTOWN DPW s114 I WATERTOWN DPW�� '> 61,66 \ E%ISNNO BUILDING \ 61x21 II I DaST" BUILDING 6 q OVERHANGS 61. FIN. FLAOR ] \3BO II PROTECTOR (TRP•) EL,-81.00 I EL-8F7.78' GRATE e e 1 5t;.6e 60g6 \\ 61�2 =-_ -• 5°25 g� ��' 6 3 v OJE 6C' \ I 61xS0 •D\ o � "49ro 60x78 NYY(( }55.15 e) o a28c BENCHMARK N I El 60,74 61x44 X CUT HW1 N. NOT I� ELEV•-e4,6s �.tlh 4� I� 6G.I9 x r Pw x � 11 I I 6os4 (elINV-M4:q ♦ �� w RN- ..98 CUB -8• PC I xr�� o 9AIP.!58 (c) 1 .-...� j I SUMP-54J ©RM81.47 o NO PARKING (.}{ 6D,34 lo! 6OA2 6M7 II 61,46 I I ❑ LP# / \ 60n60 �p/ INV•('b}55.97 x60.31 / / I 46 N`K }58.01 II s° / W.(d)-5W 63 60`J0 61x12 9XF�55.B RY-80.1J fig42 M/-5750 60� O 91LF528 61y36 Goo LPo u I � o p y m 6 6 C 1 © 60. / 62x24 I Ih o x 1 "`eE 62K15 a 1 / � 6D�9 6gA7 II 60x72 r 132 ORD Nl� STAET 62x12 II Op :I LE �✓ w � 1491. PAGE ) P \ 606p 86 1 �%h._ / 61x22 11 +II 119 61x26 9 6 fi3x19 11 .6 5 x 11 / �LP 61x03 -ALP ❑ 6151 62-161C Ip 11 I OBC 63,�7t 61x39 4LP 'Ts B 4. 4 C QQ ��INF6S91 6ax57 6481 O6 63,38 61,45 / 8.5' HIGH WOOD PENCE 8' HIGH) ff 1' LP t / �� O 056 61,72 EHOH C 6 53 O / 65.2 G POLES 1 ~ 2 �^ 65.9 ® 656 I 8' HIGH WOOD FENC m BENCHMARK /2 �p� tiJ MOOUM T0s i°s ❑ / iP" 65.02 xEHOH 65.21 SQ CUT BASE OF L1GNT I POLE ELEV.-84.70 SIGN U 63h89 65x13� 61xe6 / m �_ w TELEPHONEOX \ 62yta 62 at _o o O 3 HTGN ` ON NC. PA OBASE POLE O ,(, 61�J4 w gLP � TRANSFORMER 1i ^t C 6IX77 �� I❑ EHH O ' o sssz e I w R 000NNUwG7aN5 CONC. WALK p0c GO _ NN 6'55 °0 ce IN BC 61rb] ° P.43ftC 27 - 63�4 - 84.58RC BN�81.15 .54 ORCHARD (PUBLIC) STREET GRAPHIC SCALE 30 0 15 30 60 1 INCH = 30 FEET PAVEMENT PATCH VERTICAL GRANITE CURB SEE DETAIL AS INDICATED ON PLANS. EXISTING BIT.-\ PAVEMENT 3 1 12" TYP. In l v/ v v 4 CONCRETE FOOTING a o 3" d SEE ITEM �903. a' < a „ 6"(MIN)o 0 0 0 1 +o 0 0 120 COMPACTED DENSE GRADE GRAVEL OR RECLAIMED APPROVED SUBGRADE ASPHALT SUBBASE NOTE: 1. MINIMUM HEIGHT = 18" (CURB HEIGHT VARIES), MINIMUM WIDTH = 6" 2. INSTALL IN LOCATIONS AS INDICATED ON PLAN AND DETAILS. 3. CURB SECTIONS TO A MINIMUM OF TIN LENGTH. 4. CEMENT MORTAR JOINTS 0 INSTALL PREFORMED (1/2") EXPANSION JOINT WHERE REQUIRED. 5. SET CURB IN CONCRETE FOOTING AS INDICATED. 6. GRANITE CURB AT ALL BIOSWALES WILL BE TYPE VA-4. VERTICAL CURB SET IN CONCRETE MULCH BIORETENTION FILTER - MEDIA 0 PEA GRAVEL (SEE BIORETENTION DETAIL) NOT TO SCALE 3" SECURABLE SCREW IN PVC CAP S DIAL (MIN) SOLID SCH 40 PVC 4" PERF. PVC J\v \v y\� v \/vw \� v\\\ \\�\\�• UNDERDRAIN './�\. GRAVEL BLANKET (SEE NON -PERFORATED 4" PVC ELBOW BIORETENTION DETAIL) CONNECTION TO UNDERDRAIN PIPE FILTER FABRIC TYPICAL BIORETENTION CLEANOUT DETAIL NOT TO SCALE BIORETENTION SCHEDULE: ELEV. A ELEV. B ELEV. C ELEV. D ELEV. E ELEV. F ELEV. G Min. Underdrain Bottom Spillway Design Overflow Ponding Bottom of Overflow Bio Soil Bottom Depth Pea Bottom of Underdrain Pipe Outlet Bottom of Surface Elevation Freeboard Inlet Rim Depth Bio Area Inlet Type & Depth Top of Bio Depth Bio Soil Gravel Bed Stone cover Invert Invert Underdrain No. Area (sf) (ft) (ft) (ft) (ft) (ft)' # Mulch (ft) Soil (ft) (ft) (ft) (ft) (ft) (in.) (ft) (ft)2 (ft) 4 169 60.40 0.25 60.15 0.33 59.82 CB5 0.25 59.57 1.50 58.07 0.50 57.57 3.00 56.94 56.84 56.69 NOTES: 1. FILTER FABRIC AT BOTTOM OF UNDERDRAIN ONLY. 2. FILTER FABRIC ABOVE UNDERDRAIN SHALL EXTEND VERTICALLY 1-INCH± INTO THE PEA GRAVEL LAYER & HORIZONTALLY 1-FOOT OFF THE CENTER OF THE UNDERDRAIN PIPE. T (MIN) NO FILTER FABRIC ALONG BOTTOM OF THE FILTER FABRIC MIRAFI //\ \�/��/ BIORETENTION BED 140N OR APPROVED FILTER FABRIC (MIRAFI 140-N OR 1" MIN. APPROVED EQUAL) EQUAL (SEE NOTES) ENGINEER APPROVED NATIVE 4" PERFORATED PVC UNDERDRAIN PIPE IN 8" OR BACKFILL MATERIAL OF" WASHED CRUSHED STONE (MA HIGHWAY M2.01.0 OR EQUIV.). CONNECT TO INLET BIORETENTION FACILITY SECTION A -A NOT TO SCALE NOTES: 1. CONTRACTOR RESPONSIBLE FOR SLOPE STABILIDATION AND SAFETY MEASURES DURING CONSTRUCTION. SIDE SLOPES TO BE 3:1 MAXIMUM SLOPE. 2. LOAM AND SEED SIDE SLOPES PER SPECIFICATIONS. USE BIONET S150BN BIODEGRADABLE EROSION CONTROL BLANKET OR APPROVED EQUIVALENT TO STABILISE ALL SIDE SLOPES. THE REMAINING DISTURBED AREA SHALL BE LOAM E SEEDED OR LANDSCAPED PER PLANTING PLAN. BIORETENTION PLANTINGS I (SEE PLANTING PLAN) VERTICAL EXCAVATION SLOPE PREFERRED OR ALTERNATIVE �\\//\`//\ \ \ SLOPE (MAX 1:1) ENDCAP IF L 010' (TYP.) 4" PERFORATED PVC PIPE ❑ 0.5% SLOPE (MIN) APPROVED NATIVE BACKFILL MATERIAL DOMED DROP IN GRATE OVERFLOW OUTLET "A" BIORETENTION FACILITY DETAIL NOT TO SCALE INLET AND OUTLET ADAPTERS AVAILABLE 4" THRU 24" VARIABLE INVERT HEIGHT VARIOUS TYPES OF OUTLETS WITH WATERTIGHT ADAPTERS FOR ADS N-12, SDR-35 SEWER, SCHEDULE 40 DWV, CORRUGATED PVC, RIBBED PVC A 4 6" MIN. 3/4" 4 STONE BASE NOTE: ADAPTERS CAN BE MOUNTED ON ANY ANGLE 0% TO 359% TO DETERMINE MINIMUM ANGLE BETWEEN ADAPTERS SEE NYLOPLAST DRAWINGS. MAX. RECOMMENDED 24" � OVERALL HEIGHT 10' OVERFLOW OUTLET DETAIL NOT TO SCALE BY "NYLOPLAST" OR APPROVED EQUIVALENT UNDERDRAIN ONLY SEE SECTION A -A 4"-24" z PIPE 0 > O c" Z w= g m a (D ��I BOTTOM OF BIO SOIL "C" i,\�/, BOTTOM OF BED "D" BOTTOM OF UNDERDRAIN "G" FILTER FABRIC ON SIDE WALLS ONLY MIRAFI 140N OR APPROVED EQUAL 81 0 61 .23BC 1 � 1 G 1 CONC. WALK WATERTOWN DPW 1Ll 61.14 � � 1 � I IILl BUILDING ' WCR � 0 0 I EXISTING - 61X21 I I 1 / QJ b 61.OTC c� I I a 24 60X REMOVE AND STACKVERHANGS 6❑g4T 61 .03BC I I 1 ❑ I m OVERHANG GRANITE CURB FR&D ASPHALT I I ❑ o WITHIN SAWCUT LINE- 1 GATE LENGTH = 25 LF OVER _ _____ _- 1- ;0 b� 1 _ 1 60.6 t EL:60.66 - , 60.20 1 I �L BMP AREA 1 GRANITE CURB ❑ ❑ I oo L-_- )N Icon �00 BOTTOM EL: 59.8 LENGTH = 28 LF I I a a a a ©a Of w CB OVERHANG I �� 170 SF .87T � �10 RIM=59.94 60xO2 I� 4" PVC UNDERDRAIN 60. BC \ I I 1 m nn INV=56.15 ® I LENGTH = 10 LF / EL:60.54 I I Q 60.02X �\ I BIO OUTLET / O TC:61.01 I I c9 BC_ :60.51 I I Q �'A I RIM = 60.2' 0 O G�'O I(dx6❑26 INV OUT: 56.8' / 1.0 60X74Alwor �I INV IN: 56.9' -1 (D (b),' (Q EL:60.49 I I� c m -6619 XDMH TOTAL AREA OF o 0.94 - = o RIM=60.01 WORK = 543 SF 6 SEDIMENT FOREBAY ,� 1 CB o INV a =56.3. AREA = 32 SF Fj 1 1 < OO DD (� 3:1 SLOPE 'TC:60.89 st> / RIM=60., i ,, ,,^^ � V ' INV(b)=55.5: 60.46 NEATLY SAWCUT AND 1 I INV=57.. 0 ;; C9 INV(c)=56.94 X 60.3� GRANITE CURB BC:60.39 0B MATCH EXISTING GRADE � / 1 I SUMP=S c coi M INV(d)=55.82 LENGTH = 28 LF RIM=60.41 LENGTH = 62 LF I 1 d c z SUMP=55.4 S MP 653.1 60X97/ I 1 i"' = 3 c ' `M_ PAVED FLLU UME INLET 602 / 1111 = = cQc 8 2 � i -C G cn = M M I I i 3 o -a C? 0? a GRAPHIC SCALE 60'`70 61X12 1 I = y 3 M d(5 o 10 0 5 10 20 40 0 61X60 I 1 �^ (HiLILI) I 1 vJ 1 INCH = 10 FEET 61X46 I I z U7 1 1 18" CHINKING STONES SEE NOTE 5.. PAVEMENT PATCH SEE DETAIL EXISTING BIT. PAVEMENT O CONCRETE FOOTING SEE ITEM 0903. 6" (MIN �A PROFILE 18" PRE-TREATMENT FOREBAY SEE PLANS OUTLET STRUCTURE SEE BIORETENTION CELL FLOW 6" MAX. VARIES DETAILS 3/4" TO 1112" 6" MIN. CRUSHED AGGREGATE FILTER FABRIC MIRAFI 140N OR SECTION A -A APPROVED EQUIVALENT NOTES: 1. STONE SIDE: MINIMUM WIDTH AND LENGTH - 18"-24". 2. PLACE THE STONES ACROSS THE WIDTH OF THE BIORETENTION AREA. 3. KEY STONE INTO THE BIORETENTION EMBANKMENT. EXTEND INTO EMBANKMENT A MINIMUM OF 18" TO PREVENT FLOW FROM DIVERTING THE CHECK DAM. 4. ADD CHINKING STONES AS NECESSARY TO FILL CREVICES BETWEEN STONES. 5. CONSTRUCT THE TOP OF THE CHECK DAM SO THE CENTER IS APPROXIMATELY 6" LOWER THAN THE OUTER EDGES, FORMING A WEIR THAT WATER CAN FLOW ACROSS. 6. DO NOT EXCEED A MAXIMUM HEIGHT OF 6". STONE CHECK FOR BIORETENTION VERTICAL GRANITE CURB AS INDICATED ON PLANS. 3 1 12" TYP. �' f- 4A i 4„ a d ° TYPICAL DETAIL NOT TO SCALE �.�i.�ii��a,,�6.7�' \-- COMPACTED DENSE GRADE GRAVEL OR RECLAIMED APPROVED SUBGRADE ASPHALT SUBBASE NOTE: 1. MINIMUM HEIGHT = 18" (CURB HEIGHT VARIES), MINIMUM WIDTH = 6" 2. INSTALL IN LOCATIONS AS INDICATED ON PLAN AND DETAILS. 3. CURB SECTIONS TO A MINIMUM OF TIN LENGTH. 4. CEMENT MORTAR JOINTS 0 INSTALL PREFORMED (1/2") EXPANSION JOINT WHERE REQUIRED. 5. SET CURB IN CONCRETE FOOTING AS INDICATED. 6. GRANITE CURB AT ALL BIOSWALES WILL BE TYPE VA-4. VERTICAL CURB SET IN CONCRETE NOT TO SCALE NEW TYPE 1-1 BIT. PAVEMENT SAW KERF FILLED WITH FIBER WEARING SURFACE 0 BINDER MODIFIED ASPHALT SEALER COURSE PAVEMENT 3/4" (SEE PAVEMENT DETAIL) PAVEMENT PATCH (SEE NOTES) EXISTING PAVEMENT a 1/4" COMPACTED SUB -BASE (SEE PAVEMENT DETAIL) NOTES: 1. EXISTING BITUMINOUS PAVEMENT SHALL BE REMOVED TO A CLEAN STRAIGHT EDGE VIA SAW CUTTING. THE SAW CUT SHALL BE COMPLETED PERPENDICULAR TO THE ROADWAY/SIDEWALK. 2. PRIOR TO INSTALLING THE WEARING COURSE THE EXISTING VERTICAL PAVEMENT SURFACE SHALL BE SWEPT COMPLETELY CLEAN. 3. AFTER PROPER COMPACTION (SEE PAVEMENT DETAIL) SAW CUT NEW PAVEMENT ABUTMENT 3/4" DEEP AND FILL WITH FIBER MODIFIED ASPHALT SEALER AS SHOWN. TYPICAL PAVEMENT PATCH DETAIL NOT TO SCALE I bi LLIZU) V � 0� LLJ U U) U/ W 'EI1 U C O Z 3: � �o U O pow I- M W VJ o a a RIVER ROCK 3' WIDE AT RECEIVING END CHANNEL p �/ /// �/ ' / O O O ai ' BIO AREA BIO -AREA Q ,� eo o LL 0 0 o �o� I CONCRETE DRAINAGE / i O iv FLUME APRON / a o-co LL //> TOE OF /j 4 18° • /j //// // ; VERTICAL GRANITE SLOPE 4 CURB TYPE O SLOPE O s 4 O VA-4 I I GUTTER LINE GUTTER LINE 1'-6" GRANITE CURB CORNER 6' TYPE -A NOTES: 1. THE STONE END SECTION TO BE PLAN VIEW LOW POINT AT INLET UNDERCUT SO THAT THE INVERT OF THE (DEPRESS 1" BELOW TYPICAL APRON TO BE AT THE SAME GRADE GUTTER SLOPE) (FLUSH) WITH THE SURFACE OF THE 18" o RECEIVING CHANNEL. 2. THE WIDTH OF THE END OF THE APRON 2 2 c .0 :3o N SHALL BE EQUAL TO THE BOTTOM WIDTH 1 6" 00 O U) � ob o OF THE RECEIVING CHANNEL. MAXIMUM \\/ \/�` _F N o .400 N TAPER TO RECEIVING CHANNEL 5:1. El Co FINISH PAVEMENT APPROVED SUBGRADE b L_ o No 0 is GRANITE CURB cn m rn Do CL LL o (SEE DETAIL) CHANNEL SECTION Roo®0®I� 1' 6" TAPERED RELIEF 1" BELOW GUTTER LINE 6" CRUSHED77777-7-7 C STONE CONCRETE \1 APRON ! O O \j��ji�j��// TOE FABRIC 61, `�\XI j\� j�� ` •`� EXTEND FLUME TO TOE OF SLOPE Pro®w0000r: s III 6-10" THICK, RIVER ROCK 15145A 1 11111 (D50 = 3") SECTION VIEW STONE 0 GEOTEXTILE BIOSWALE INLET DETAIL FILTER FABRIC s0oo17v000a-: NOT TO SCALE APPROVED SUBGRADE - w El J El U fY Lu FL'2 vJ L0 u EI El El El (D L0 L0 77 U O Ln Lo 777 L0 0 1A ❑ M CD Ln O ti M O Lo 0 7 n ■ ■ ■ SEE DTE 3 CHINKING STONES SEE NOTE 5. �A PROFILE EXISTING 3" MINIMUM L 9" MAXIMUM PAVEMENT PONDING DEPTH BIORETENTION SURFACE FILTER FABRIC (MIRAFI 140N OR APPROVED EQUIV.) APPROVED NATIVE MATERIAL SUBGRADE 3EE )TC PRE-TREATMENT FOREBAY x SEE PLANS OUTLET 17 STRUCTURE SEE BIORETENTION CELL \/ FLOW 6" MAX. VARIES DETAILS x 3/4" TO 11/2"' 6" MIN. CRUSHED AGGREGATE x FILTER FABRIC MIRAFI 140N OR SECTION A -A APPROVED EQUIVALENT NOTES: 1. STONE SIFE: MINIMUM WIDTH AND LENGTH - 18"-24". x 2. PLACE THE STONES ACROSS THE WIDTH OF THE BIORETENTION AREA. 3. KEY STONE INTO THE BIORETENTION EMBANKMENT. EXTEND INTO EMBANKMENT A MINIMUM OF 18" TO PREVENT FLOW FROM DIVERTING THE CHECK DAM. 4. ADD CHINKING STONES AS NECESSARY TO FILL CREVICES BETWEEN STONES. 5. CONSTRUCT THE TOP OF THE CHECK DAM SO THE CENTER IS APPROXIMATELY 6" LOWER THAN THE OUTER EDGES, FORMING A WEIR x THAT WATER CAN FLOW ACROSS. X 6. DO NOT EXCEED A MAXIMUM HEIGHT OF 6". STONE CHECK FOR BIORETENTION x x c� c� TYPICAL DETAIL NOT TO SCALE x � BIORETENTION PLANTING x 6„ FURNISHED TYP. BIORETENTION SOIL i- DMH I-6 x RIM: 72.31' vv v" 3:1 TYP. INV IN (DMH 10): 67.57' 3„ ll /\\//\� /j\�/j\�/j\�/ INV OUT (WQI F-2): 67.38' BIORETENTION DETAIL NOT TO SCALE DRIVABLE 3' WIDE AT GRASS END SURFACE / // / / JJJJJJJJJJJJJJJJ / / / JJJJJJJJJJ JJJ i FOREBAY // / JJJJJJJJ JJJ // FOREBAY� \N CONCRETE DRAINAGE < FLUME APRON / TOE OF /j / 1 3° • /j // // /j EXISTING / SLOPE a 3:1 / VERTICAL SLOPE GRANITE • CURB 121' - 12" RCP GUTTER LINE GUTTER LINE S=1.2% 1'-6" GRANITE CURB i CORNER 6' TYPE -A NOTES: 1. THE STONE END SECTION TO BE PLAN VIEW LOW POINT AT INLET UNDERCUT SO THAT THE INVERT OF THE (DEPRESS 1" BELOW TYPICAL APRON TO BE AT THE SAME GRADE GUTTER SLOPE) (FLUSH) WITH THE SURFACE OF THE 18 X RECEIVING CHANNEL. 2. THE WIDTH OF THE END OF THE APRON �. 2 SHALL BE EQUAL TO THE BOTTOM WIDTH 6" OF THE RECEIVING CHANNEL. MAXIMUM \\� TAPER TO RECEIVING CHANNEL 5:1. �c»c�Zxb \��\\// - -74- - - FINISH PAVEMENT APPROVED SUBGRADE D D EXISTING GRANITE CURB CHANNEL SECTION V-6" TAPERED RELIEF 1" BELOW GUTTER LINE 6" CRUSHED _77/ / STONE CONCRETE APRON / 3' TOE FABRIC 1 Fa, EXTEND FLUME TO TOE OF SLOPE 6-10" THICK RIVER ROCK SECTION VIEW (D50 = 3") STONE J FILTER BIOSWALE INLET DETAIL FABRIC NOT TO SCALE APPROVED SUBGRADE 18" MIN. W - 7,/ VERTICAL EXCAVATION SLOPE (PREFERRED) OR ALTERNATIVE SLOPE (MAX. 1:1) CONTRACTOR SHALL BE RESPONSIBLE FOR SLOPE STABILIFATION BENCHMARK \ TOP OF HYDRANT \ SPINDLE EL=75.89 / - X� X X D _ 10" ROOF DRAIN INV. = 69.33' HOSMER ELEMENTARY SCHOOL c� S �CD I 0 0 CD w uj v / O N 72 X Z I (n 1 �I 0 1 \ W D iD I- \ 35' - 12" RCP NEATLY SAWCUT AND S=1.0% / MATCH EXISTING GRADE CURB CUT / / w RE -GRADE TO fff PROPOSED CURB CUT NOTES: 1. EXISTING CONDITIONS BASED OFF PLAN TITLED, "ADDITION AND RENOVATIONS AT THE HOSMER ELEMENTARY SCHOOL" WATERTOWN, MA. PREPARED BY: GALE ASSOCIATES, INC. DATED: JANUARY 22, 2001 SOIL TEST PIT DATA PERFORMED BY: JANET C. BERNARDO, HORSLEY WITTEN GROUP, INC DATE: DECEMBER 30, 2016. TP-3 0. 54.8 A FILL 4" 53.8 E NO REDOXYMORPHIC FEATURES 22' - 12" RCP S=2.5% - W - - - - - - - D D D D SEDIMENT FOREBAY D D D \ D W D EL=69.9' - D W D D - 0 0 ❑❑ in o Li m m U o U C] � m r � o a 0 co o c� 42 UJ =cQo�QLo 0 ai O s. co M N 10 13 co 2 cn 3minaa o AREA = 54 SF U) U) APPROX. LOCATION FIELD VERIFICATION HANCOCK STREET z w DRAIN LINE) ON DEPTH OF GAS / LINE CB #3 RIM: 70.56' BIORETENTION AREA - - - - - - - INV OUT (WQI #2). 67.2 SURFACE AREA = 372 SF EL = 69.9' G PAVED FLUME G , --- -- G V ---- --- 7 7 .5 \ o / T� / / CURB CUT REMOVE AND / / SOIL STOCKPILING O DISPOSE ASPHALT / S EXISTING WALL AND STAGING WITHIN SAWCUT -TO REMAIN / AREA _ 27' - 12" RCP / \ DMH #5 O 15' - 12" RCP / S=1.0% / / ' - 0 - S RIM: 72.66' S= 1.0/o o O \ INV IN (ROOF): 6&'69'- - / / \ INV IN (WQI #2): 66.64' - ' \ 3:1 SLOPE MAX INV OUT (DMH #6): 66.54' ' / \ O / � \ \ WATER QUALITY INLET 2 \ \ O \ O 1,000 GALLON TANK \ RIM: 70.74' CB #4 \ O - - -INV IN (CB ❑3): 67.05' / 'RIM: 68.55 \ 7�- - INV IN DMH ❑4 : 67.05' ` I� (DMH #7): 6 00' ( ) �. \ INV OUT (DMH 115): 66.80' � � D \ / 30'-12"RCP 44'-12"RCP S= 2.2 /o \\ D D S=1.1% \ O w J DMH 1F4 L RIM: 71.72' L�u \ INV IN (DMH 113): 67.57' I \ INV OUT (WQI L2): 67.38' --------72-- ------------ -- 7// LIMIT OF WORK / i AREA = 1,827 SF - ---- G------------ G CB #7 RIM: 68.00' INV :63.00' INV IN (CB #5): 62. ' INV OUT (WQI #3): 62.21' LLI U) -- - - - J 0 Z) - 00< > (j) /21 '^ U) 5- G < LLJ LLI Z U) Q OHO Lij ,� O �13'-12"F1 S=1.7% I GRAPHIC SCALE 10 0 5 10 20 (fT➢ [Ill❑l 1 INCH = 10 FEET 0O (D 7 04 N r` L LL _F O b C 3: 2 O O p co O x d `i ROD®❑®D 'o \zx\ G0� Pro®[ENOF FCr: SJOOC] 40 15145A 1 Ell S I ILN I r: C-1 Appendix 6 El El W Ln i Lo B El El El n ❑ H El El C� Ln Lo 77 9 U O Lr) Lo 77 0 El n El El N I vt O ST TIO N#22 SPI E SET N 2 58077.21 E 7 3940.25 EL V=41.57 oy F W— oy ------- CTV— HH i 91 3n M CTV CTV — �� W ------ r vo \ � - , - - CTV A \ O CTVO \ y ✓ - ----------------------- CTV � m � W � \ _ I- Cry \ \ CTV o�� \ 3n E/r/c CTV W - _EiriC I CTV k.�W—p CTV — E/T/C E/T/C °yF p 0I CTV —CTV CTV E/T/C U CTV E/T/C — —� � C - Erric — E/r/c °yam ETV Eric A, o�� p \� cry W / \ E/T/C — E/T/C E/T/ � � CTV \ \ � E/T/C E/T/C —- E/T/C \ \ \ CTV W E/T/C O \ CTV — E/T/C CTV \ / \ — W — E/T/C — E?/C OyF m �� O�� E?/C \ E/T/C —7 4—_ 7 � W � �/T/C E?/C \ \ E /C Ei7iC % \ 1 W— / E�/c E/T/C /C A� O VZ • � V /T/C � E?/C i Y �� W E/r/C - - -- O - E/71C / e19YC — E/riC — W , — E/r/C Oym — E/ E/ric / ric — k W \— E/r/c �f /= E/r/c Ei E?/C ric H _E?/C 41.50 _C— // Wes— E?/C � O D _:-� W- E?/C T r _ 51 / CB R=41.53 T I ' h I I BRICK ENTRANCE / COLUMN � ' 1 \ I BRICK ENTRANCE \\ 1 COLUMN \ I I \ h 1 I 1 I I � I � I 1 I 1 i 1 / I / I / I � I � I / �n 15"D i / I ' / \ ` R=45.48 I _ m M \ \ WG M R=44.67 °°—M— SMH \ 4= R5.00 I CB STATIONft74nn STK/NAIL SET N 2957894.82 E 74400/.uu ELEV=45.27 4 UPWLT#47-5 CB R=44.20 3" D El M— �M— GRAPHIC SCALE 10 0 5 10 20 im C � O � O 0 C = 2 Qi Q tp O Go co O o co 30 �00 om cn O VJ w� �w cn I— Z) � U U cn Q � Q U) z Q Q p�2 Q z z w—� 0o z p wF— w V o ❑ ❑ a a I � o I ❑ El d IL 0 0 0 o 0 Lo � m C m co O co M op Mc Q M 7 ❑ El <2000 ® 5 1ao I a` 8 ❑ ❑El o o ❑❑ u�i 2 o �U)ILLL0 RuLiurrr- TP F- mUEl 0 0 0 N of w m Lu O z 0 z_ yJ X w Pr❑®IEN011 11o': SE11111C2 1514 1 1 ❑❑ 4 Fil ■ i ■ (Ire rmFl) 1 INCH = 10 FEET S❑❑oEvoo oo': C-1 FA Ll Ll H U) L6 7 9 d u❑ �J m C� Lo Lo F-I n U 0 Ll 71 Lf) Ir- Ir- 7 tj co Fj co rn N ■ ■ EMH R=41 Jo �W- K �W S TION#22 I SPI SET N 2 58p77.21 E 7 3940.25 4 1.4 7' EL W V UPOS-55----------- --- t 41.94 3„ D 50 15 - W,- I I 0 4185 NEW GRANITE CURB (TYP.) --\ NEW CONCRETE SIDEWALK W--- I ----------------------- W MEET EXISTING URB AND SIDEWALK tiYo V EXISTING CURB TO REMAIN EXISTING CATCHBASIN ADD BEEHIVE GRATE AND RAISE RIM TO FINISHED GRADE PROP. RIM EL.=41.8' EX. 8" INV.=38.2' \ 40.0 /(n�\ N.;_5-54 ^ , 41.72 Cal 10 �4 3n 3„k d I 41.30--- 40. 2 CMH ------ ' 40.92 �� 4�.11----3n -- 3"D R=4.52 NNA,\ J W R=41.50 \ 40.66 0 W� �\� 40.50 �W� EXISTING DMH TO REMAIN V`V Cg EX. RIM EL.=41.6' 41 W EX. 12" RCP INV.=37.5' SMh/ R=40773, W EX. 12" RCP INV.=37.0' \ - EX. 8" INV.=37.9' - __ \ \ CB EX. 10" INV.=39.2' R- 4/ 68 41,54 \ PROP. 4" PVC INV.=39.0' \ \ \ CONTRACTOR TO VERIFY \ EXISTING INVERTS A35.9 \� 4" PERFORATED R=39.83 i PVC UNDERDRAIN 1=34.7(E) W V 1=34.8(y� BIOSWALE 290 SF BOTTOM EL.=41.3' Ls / -W� a as a _50 a a CLEANOUTS a 4" PVC INV.=39.1' :42.2' / + MEET EXISTING / BRICK ENTRANCE COLUMN RIVER STONE CHECK DAM FOREBAY RIVER STONE CHANNEL (TYP.) ASPHALT FLUME (TYP.) PROPOSED CATCHBASIN 1 PROP RIM EL.=42.6' PROP. 12" PVC INV.=40.6' wa- �W- I EL:42.01' a - --- CURB AND SIDEVVACK W �--EL:42.0'�\ a W� 0 / /// --�/� EXISTING CURB T - TO REMAIN - T EXISTING SIDEWALK T VCC 3n ---- -in U O � O J }+ O ci C,4 0 ' � w Q o uj o y tp tp �► of Qi RS y0 u� 4'.to c) m �aMM W Go co 0 ti 3� �0000 00 2 co (1) (z o Z TO REMAIN T T - I /o EXISTING CATCHBASIN � 7' TO REMAIN >2„ � T RAISE RIM TO MEET 04 - T - FINISHED GRADE 4� ('- 00 TO REMAIN T T - I /o EXISTING CATCHBASIN � 7' TO REMAIN >2„ � T RAISE RIM TO MEET 04 - T - FINISHED GRADE 4� ('- 00 / I ' BRICK ENTRANCE COLUMN PROP. RIM EL. 42.4' \ I EX. 10" INV.=39.5' EL:42.0' ' \ I I ELA; .0' PROPOSED DMH 1 D CONNECT TO EXISTING ELA2.2' 12" RCP DRAINAGE PIPE EL:4 EL:42.5' .2' PROP. RIM EL.=42.3' ELA .5'. PROP. 12" PVC INV.=38.3' 1.7 PROP. 12" PVC INV.=38.3' EX. 12" RCP INV.=FIFIC I 1.71 PROPOSED CATCHBASIN 2 ' o PROP. RIM EL.=42.6' PROP. 12" PVC INV.=40.6' II I o NEW GRANITEICURB 1 cQD I ` c� \ I Z Y �M�. �M� �s\ o v 8"VCF i I=31.4 I m NOTES: 1. BEACON PARK CLOSURE IS SUBJECT TO DISCONTINUANCE OF THE PUBLIC WAY BY THE TOWN 2. CONTRACTOR TO VERIFY ALL EXISTING INVERTS ARSENAL STREET I \ � 4S Q WG M R=44.67 11 *-M . \ SMH o R44,0go4 �0 � U / Q Q7 STATION#7000 STK/NAIL SET N 2957894.82 E 744007.00 ELEV=45.27 4 UPWLT#47-5 8"VCP 6"CI G GRAPHIC SCALE 10 0 5 10 20 40 (Im rmFl) 1 INCH = 10 FEET U w w U) � U U Qz U) U z Q C Q z z w - 0o z p w Lu V LL 8 aD o0 d d LL Q Z3 0 CD O C o C d m a N M c) O C.70 C'' Q M Q pp OO o >-- m o U o O � J L oco O X U) = co rn Cn d LL 0 R lTFF TTTT: P o- o\ A` Q o� JG o� G Pr❑®[M0E Ilo•: SE11111C] 15145 2 ❑❑ 4 S❑❑❑I N11E oo•: C-2 El uj L6 Lo B El El El d El H El El U Ln Lo 71 t 0 ED 71 Ll L0 IV - IUD 77 Lo T_ O �1wL El El El l� 0) N rn N 71 18r CHINKING STONES SEE NOTE 5 PROFILE NOTES: 1. CONTRACTOR RESPONSIBLE FOR SLOPE STABILI-ATION AND SAFETY MEASURES DURING CONSTRUCTION. SIDE SLOPES TO BE 3:1 MAXIMUN SLOPE. 2. LOAM AND SEED SIDE SLOPES PER SPECIFICATIONS. USE BIONET S150BN BIODEGRADABLE EROSION CONTROL BLANKET OR APPROVED EQUIVALENT TO STABILISE ALL SIDE SLOPES. THE REMAINING DISTURBED AREA SHALL BE LOAM T SEEDED OR LANDSCAPED PER PLANTING PLAN. EROSION CONTROL BLANKET PRE-TREATMENT FOREBAY SEE PLANS OUTLET STRUCTURE SEE BIORETENTION CELL FLOW 6" MAX. VARIES DETAILS 3/4" TO 1-1/2" ---- 6" MIN. CRUSHED AGGREGATE FILTER FABRIC MIRAFI 140N OR SECTION A -A APPROVED EQUIVALENT NOTES: 1. STONE SIDE: MINIMUM WIDTH AND LENGTH - 12"-18". 2. PLACE THE STONES ACROSS THE WIDTH OF THE BIORETENTION AREA. 3. KEY STONE INTO THE BIORETENTION EMBANKMENT. EXTEND INTO EMBANKMENT A MINIMUM OF 18" TO PREVENT FLOW FROM DIVERTING THE CHECK DAM. 4. ADD CHINKING STONES AS NECESSARY TO FILL CREVICES BETWEEN STONES. 5. CONSTRUCT THE TOP OF THE CHECK DAM SO THE CENTER IS APPROXIMATELY 6" LOWER THAN THE OUTER EDGES, FORMING A WEIR THAT WATER CAN FLOW ACROSS. 6. DO NOT EXCEED A MAXIMUM HEIGHT OF 6". STONE CHECK FOR BIORETENTION TYPICAL DETAIL BIORETENTION PLANTINGS (SEE PLANTING PLAN) \ X" PONDING F DEPTH (MAX) •r•r•r• �r•r•r•r VERTICAL EXCAVATION SLOPE / PREFERRED OR ALTERNATIVE '� SLOPE (MAX 1: 1) ENDCAP IF L F 10' (TYP.) 4" PERFORATED PVC PIPE Li 0.5% SLOPE (MIN) APPROVED NATIVE BACKFILL MATERIAL MATERIAL SPECIFICATIONS NOT TO SCALE SEE SITE PLAN -- EXISTING CATCHBASIN TO REMAIN ADD BEEHIVE GRATE AND RAISE RIM TO FINISH GRADE OVERFLOW OUTLET "A" SEE DETAIL TAPER BIORETENTION SOIL AND MULCH FROM OUTLET STRUCTURE 3"SHREDDED HARDWOOD MULCH i IDERDRAIN J / OUTLET PIPE INVERT "E" INVERT "F" BIORETENTION FACILITY DETAIL NOT TO SCALE 1. BIORETENTION SOIL SUBMIT SOIL SAMPLE (2LBS) AND TESTING ANALYSIS RESULTS BY A QUALIFIED SOIL TESTING LABORATORY INDICATING AND INTERPRETING TEST RESULTS FOR COMPLIANCE WITH THE FOLLOWING PARAMETER: A. UNIFORM SOIL MIX, FREE OF NOXIOUS WEEDS AND STONES, STUMPS, ROOTS OR OTHER SIMILAR OBJECTS LARGER THAN 1 INCH. B. PROVIDE USDA UNIFIED SOIL CLASSIFICATION: LOAMY SAND C. PROVIDE A TEXTURAL ANALYSIS INCLUDING THE GRADATION AND PERCENTAGES OF SAND, SILT, AND CLAY CONTENT 85-88% SAND (T 10% COARSE SAND) 8-12% SILT AND CLAY (_ 2% CLAY) D. ORGANIC MATTER: 3% WELL AGED (6-12 MONTHS), WELL AERATED, LEAF COMPOST OR APPROVED EQUIVALENT E. PROVIDE A SOIL TEST OF THE BIORETENTION SOIL FOR CONFORMANCE TO THE FOLLOWING CRITERIA: PH RANGE: 5.2-7.0. MAGNESIUM: MINIMUM 32 PPM. PHOSPHOROUS (P205): NOT TO EXCEED 69 PPM. POTASSIUM (K20): MINIMUM 78 PPM. SOLUBLE SALTS: NOT TO EXCEED 500 PPM. IF THE SOIL PH IS NOT WITHIN THE ACCEPTABLE RANGE, AMEND WITH LIME TO RAISE THE PH OR WITH IRON SULFATE TO LOWER THE PH, AS NECESSARY. ALL TESTING SHOULD BE PERFORMED BY THE SAME TESTING FACILITY TO MAINTAIN CONSISTENT RESULTS. SUBMIT THE SOIL SAMPLE RESULTS TO THE ENGINEER REVIEW AND APPROVAL PRIOR TO DELIVERY TO THE PROJECT SITE. F. VOLUME OF FILTER MEDIA BASED ON 110% OF PLAN VOLUME TO ACCOUNT FOR SETTLING OR COMPACTION. G. DO NOT MIX, DUMP OR STORE ANY OTHER MATERIALS OR SUBSTANCES THAT MAY B E HARMFUL TO PLANT GROWTH OR PROVE A HINDRANCE TO THE PLANTING MAINTENANCE OR OPERATIONS WITHIN THE BIORETENTION AREA. 2. MULCH A. FINE SHREDDED WELL AGED (6 MONTH MINIMUM) HARDWOOD MULCH. HARDWOOD MULCH IS PREFERRED TO PREVENT FLOATING. IF HARDWOOD MULCH IS NOT AVAILABLE A FINELY DOUBLE SHREDDED, WELL AGED, ORGANIC DARK PINE MULCH MAY BE ACCEPTABLE ON A CASE BY CASE BASIS PER SAMPLE SUBMITTAL AND ENGINEER REVIEW. B. A MULCH SAMPLE MUST BE SUBMITTED AND APPROVED BY THE ENGINEER PRIOR TO DELIVERY TO THE PROJECT SITE. 3. FILTER FABRIC A. NON -WOVEN GEOTEXTILE FABRIC WITH FLOW RATE OF -1110 GALLON/MINUTES/SQUARE FOOT. B. CLASS "C" APPARENT OPENING SIZE (ASTM-D-4751). C. GRAB TENSILE STRENGTH (ATSM-D-4632) BURST STRENGTH (ASTM-D-4833). 4. PEA GRAVEL A. 3/8" WASHED STONE 5. UNDERDRAIN GRAVEL A. 3/4" CRUSHED WASHED STONE, CLEAN AND FREE OF ALL FINES AND MEETING AASHTO M-43. 6. PIPE A. UNDERDRAIN 4" RIGID SCHEDULE 40 PVC PIPE, WITH 3/8" PERFORATIONS @ 6" O.C. MEETING ASTMD 1785 OR AASHTO M-278. T'S AND Y'S FITTINGS AS REQUIRED FOR THE UNDERDRAIN CONFIGURATION INDICATED ON DRAWING. B. CONNECTIONS TO STORM DRAIN SYSTEM. C. UNDERDRAIN CLEANOUTS NON PERFORATED SCHEDULE 40 PVC PIPE, PVC ELBOW, CAP, AND ALL ASSOCIATED FITTINGS. 7. EROSION CONTROL BLANKET (3:1 SIDE SLOPES ONLY) A. WOVEN, 100% BIODEGRADABLE JUTE FIBER 7.70 LBS/1000 SOFT. BIONET S150BN OR APPROVED EQUIVALENT. 8. PLANTS A. AS INDICATED ON DRAWINGS. 9. SEED (SIDE SLOPES ONLY) A. NEW ENGLAND CONSERVATION/WILDLIFE/MIX OR APPROVED EQUIVALENT. B. APPLICATION RATE 25 LBS/ ACRES OR PER SEED MANUFACTURER'S REQUIREMENTS. 10. OUTLET STRUCTURE A. SI_E AS INDICATED ON DRAWINGS. B. FIBERGLASS REINFORCED PLASTIC MANHOLES OF SIDE INDICATED ON DRAWINGS. BIORETENTION CLEANOUT IF LC10' GRAVEL STONE BLANKET, AND FILTER FABRIC AROUND UNDERDRAIN ONLY / 3' N MIN �_j 3" MIN T, 3 /i TOP OF BIO SOIL j\ BOTTOM OF BIO SOIL 12" MIN. � • BOTTOM OF GRAVEL STONE FILTER FABRIC ON SIDE WALLS ONLY MIRAFI 140N OR APPROVED EQUAL GRANITE CURB W W W WrO� W T W • W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W '• W W W W W BITUMINOUS FLUME RIVER STONE CHANNEL NOTES: 1. THE STONE END SECTION TO BE UNDERCUT SO THAT THE INVERT OF THE PLAN VIEW APRON TO BE AT THE SAME GRADE WIDTH (FLUSH) WITH THE SURFACE OF THE VARIES RECEIVING CHANNEL. 2. THE WIDTH OF THE END OF THE APRON TO 2 �. BE EQUAL TO THE BOTTOM WIDTH OF THE 61 RECEIVING CHANNEL. MAXIMUM TAPER TO RECEIVING CHANNEL 5:1. OO OO O 6. THE GEOTEXTILE FILTER FABRIC TO BE TOE MIRAFI 140N OR EQUIVALENT FABRIC APPROVED SUBGRADE STONE - FABRIC FINISH PAVEMENT CHANNEL SECTION 6" ROAD BASE LOW POINT TWO LAYERS TYPE 1-1 BIT. CONCRETE (SEE PAVEMENT DETAIL) RIVER STONE (D50 = 6") r\\r\/ /' O \ EXTEND RIVER STONE 4' PAST BOTTOM OF SLOPE EXTEND FLUME V MIN. PAST TOS 12" DEPTH J APPROVED SUBGRADE 3" BASE OF 3/4" SECTION VIEW COMPACTED STONE OVER NON -WOVEN PAVED DRAINAGE FLUME DETAIL FILTER FABRIC NOT TO SCALE DOME GRATE NOTES: � 1. MATERIALS TO CONFORM TO 0.2529 0.66671 ASTM A536 GRADE 70-50-05 2. CASTINGS ARE FURNISHED WITH T 0.1250 A BLACK PAINT DOME FRAME AND GRATE DETAIL NOT TO SCALE VERTICAL CURB (TYP.) GROUND SURFACE 3' 12" 6' TRANSITION PIECE TRANSITION NOTE: 1. CURB TO CONFORM TO THE MASS END SECTION DOT STANDARD SPECIFICATIONS FOR HIGHWAYS AND BRIDGES. 72" (MAX.) 24" (MIN.) 2. EDGING CURB TO BE INSTALLED IN ACCORDANCE WITH SECTION 501 OF THE MA DOT STANDARD T_ SPECIFICATIONS FOR HIGHWAYS AND BRIDGES BUT TO THE REVEAL 18 AND SLOPE SHOWN IN THE L DETAILS. 3, INSTALL TRANSITION CURB AT ALL WALKWAY/RAMPS AND CURB 6" (TYP.) ENDINGS. PROFILE SIDE VERTICAL CURBING NOT TO SCALE C � O C O 0 r = C1 M +a)+ Q o L0 G� � co co c- o v cc cy � MM = oaco i co O = in30 ti moo U) NLu ~ L.L ��L^^ VJ U U Q�Q ~ U) Z Q p0�2 z z Lu 3j 0o z p LLI Lu Lu C� Q i o ❑ ❑ a a b w ai o0 a a LL IZ- CL Z3 O (Lr'� V S= O CA.o C C7 - co m N M c') O co cl) Q_ Q � OO ❑ L o b❑ cn O 2 O X rnindLi0 R TTFF TT1TT m U El ❑❑ L Lu 0 z O U N� L.L U) z O U Pr❑®[ENOF Eo-: SLL11C] 1514%1 1 3 ❑❑ 4 S ❑❑oEv oo ❑11: C - 3 GENERAL PLANTING NOTES: GENERAL SEEDING NOTES: El Q Lf� Lid El ❑� 173L Ll El (D U LO IZT LO 77 El 0 El El >❑ Lid LO 77 LO O L CO O� N ■ ■ zO-1 1. THE FOLLOWING NOTES ARE PROVIDED AS GENERAL PLANTING GUIDELINES ONLY. THOROUGHLY REVIEW THE PROJECT SPECIFICATIONS FOR ALL LANDSCAPE REQUIREMENTS PRIOR TO THE COMMENCEMENT OF ANY LANDSCAPE WORK. SUBMIT IN WRITING TO THE LANDSCAPE ARCHITECT ANY QUESTIONS OR CLARIFICATIONS REQUIRED AT A MINIMUM OF 30 DAYS PRIOR TO ORDERING ANY MATERIALS OR BEGINNING ANY LANDSCAPE CONSTRUCTION. 2. SUBMIT TO THE LANDSCAPE ARCHITECT FOR REVIEW AND APPROVAL ALL REQUIRED LANDSCAPE SUBMITTALS AS DESCRIBED IN THE SPECIFICATIONS INCLUDING A PLANT LIST WITH PLANT SI-E AND QUANTITIES TO BE ORDERED PRIOR TO DELIVERY TO THE PROJECT SITE. 3. FURNISH AND INSTALL ALL PLANTS AS SHOWN ON THE DRAWINGS AND IN THE SI E AND QUANTITIES SPECIFIED ON THE PLANTING SCHEDULE. PLANT SUBSTITUTION SELECTION MUST BE APPROVED BY BIOLOGIST OR LANDSCAPE ARCHITECT PRIOR TO INSTALLATION. 4. ALL PLANTS TO COMPLY WITH APPLICABLE REQUIREMENTS OF ANSI Z60.1 "AMERICAN STANDARD FOR NURSERY STOCK." LATEST EDITION, PUBLISHED BY THE AMERICAN NURSERY AND LANDSCAPE ASSOCIATION INC. 5. PLANTS TO BE GROWN UNDER CLIMATIC CONDITIONS SIMILAR TO THOSE IN THE LOCALITY OF THE PROJECT FOR AT LEAST TWO (2) YEARS. USE HEALTHY NURSERY GROWN PLANTS, FREE OF DISEASE, INSECTS, AND PESTS. EGGS OR LARVAE, AND HAVE A WELL DEVELOPED ROOT SYSTEM. 6. INSTALL PLANTS WITHIN ONE (1) WEEK OF PURCHASE. IF PLANTS ARE TO BE STORED AT THE SITE PRIOR TO PLANTING, IT IS THE CONTRACTOR'S RESPONSIBILITY TO ENSURE THEY ARE PROPERLY MAINTAINED, WATERED, AND REMAIN HEALTHY. 7. PROCEED WITH PLANTING ONLY WHEN EXISTING AND FORECASTED WEATHER CONDITIONS PERMIT. SUBMIT TO THE LANDSCAPE ARCHITECT IN WRITING THE PROPOSED PLANTING SCHEDULE. OBTAIN APPROVAL OF PLANTING SCHEDULE FROM THE LANDSCAPE ARCHITECT PRIOR TO PERFORMING ANY WORK. F:�yF_FY07►Ry1i1:»A_1019I0[o SPRING: DECIDUOUS: APRIL 1 TO JUNE 15 EVERGREEN: APRIL 1 TO JUNE 15 PERENNIALS: APRIL 15 TO JUNE 1 GROUNDCOVERS: APRIL 15 TO JUNE 1 FALL: DECIDUOUS: EVERGREEN: PERENNIALS: GROUNDCOVERS SEPTEMBER 15 TO NOVEMBER 15 SEPTEMBER 15 TO NOVEMBER 15 SEPTEMBER 15 TO NOVEMBER 15 SEPTEMBER 15 TO NOVEMBER 15 9. PLANTING UNDER FRO -EN CONDITIONS IN EITHER THE SPRING OR FALL WILL NOT BE PERMITTED. PLANTING BEFORE OR AFTER THE ABOVE REFERENCED PLANTING DATES WILL INCREASE THE LIKELIHOOD OF PLANT OR GRASS SEED ESTABLISHMENT FAILURE. ANY DEVIATION FROM THE ABOVE REFERENCED PLANTING DATES IS UNDERTAKEN AT SOLE RISK OF THE CONTRACTOR AND IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO PROVIDE ANY ADDITIONAL MAINTENANCE AND WATERING WHICH MAY BE REQUIRED TO ENSURE SATISFACTORY PLANT AND SEED ESTABLISHMENT. 1. SEND A REPRESENTATIVE SAMPLE OF THE TOPSOIL TO A TESTING LABORATORY FOR STANDARD SOIL ANALYSIS AS DESCRIBED IN THE SPECIFICATIONS. SUBMIT TO THE LANDSCAPE ARCHITECT AND ENGINEER TEST RESULTS WITH RECOMMENDED SOIL TREATMENTS TO PROMOTE PLANT AND GRASS GROWTH. CORRECT DEFICIENCIES IN THE LOAM AND STOCKPILED TOPSOIL AS DIRECTED BY THE TESTING AGENCY. 2. ALL AREAS THAT ARE DISTURBED AND/OR GRADED DURING CONSTRUCTION ARE TO BE BROUGHT TO FINISHED GRADE WITH AT LEAST 6" MINIMUM DEPTH OF GOOD QUALITY LOAM AND SEEDED WITH A QUICK GERMINATING GRASS SEED SUCH AS NEW ENGLAND EROSION CONTROL RESTORATION MIX OR AS SPECIFIED ON THE PLANS. 3. PRIOR TO THE PLACEMENT OF TOP SOIL, LOOSEN THE SUBGRADE OF ALL PROPOSED SEEDED AREAS TO A DEPTH OF 6" AND RAKE TO REMOVE STONES LARGER THAN 1 INCH, STICKS, ROOTS, RUBBISH AND OTHER EXTRANEOUS MATTER AND LEGALLY DISPOSE TO AN OFF SITE LOCATION. 4. DO NOT SPREAD TOPSOIL IF THE SUBGRADE IS FRO -EN, EXCESSIVELY WET, COMPACTED OR NOT PROPERLY PREPARED PER THE NOTES AND SPECIFICATIONS. WATERING NOTES: 1. PROVIDE PROPER PLANT CARE, MAINTENANCE AND WATERING ON SITE UNTIL SUCH TIME AS THE LANDSCAPING IS ACCEPTED BY THE PROPERTY OWNER AS SATISFACTORY PER THE SPECIFICATIONS OR AS DETERMINED BY ANY WRITTEN AGREEMENTS BETWEEN THE CONTRACTOR AND PROPERTY OWNER. 2. ESTABLISH AN APPROPRIATE WATERING SCHEDULE FOR ALL PLANT MATERIAL BASED UPON PLANT SPECIES REQUIREMENTS AND PROVIDE IN WRITING TO THE LANDSCAPE ARCHITECT AND OWNER FOR REVIEW AND APPROVAL, ADHERE TO THE APPROVED SCHEDULE UNTIL PLANTS ARE FULLY ESTABLISHED. 3. SPECIAL CARE SHOULD BE TAKEN TO ENSURE THAT THE LAWN IS NOT SATURATED DURING WATERING. IF AN IRRIGATION SYSTEM IS NOT PROVIDED, A TEMPORARY IRRIGATION SYSTEM OR HANDHELD GARDEN HOSE SHALL BE USED FOR WATERING SEEDED AREAS. THE AREA MUST BE MAINTAINED CONSISTENTLY MOIST FOR THE BEST GERMINATION RESULTS. ADDITIONAL WATERING WILL BE REQUIRED IF PLANTING AND SEEDING OCCUR OUTSIDE OF THE RECOMMENDED PLANTING SEASONS. RETAIN SAME FINISH GRADE AFTER PLANTING AS ORIGINAL GRADE BEFORE DIGGING TOPSOIL -NO STONES GREATER THAN 1 FINISH GRADE COMPACT WITH A HANDROLLER IN TWO DIRECTIONS FINE RAKE PRIOR TO SEEDING SUBSOIL - COMPACTED AT 90% MAXIMUM DENSITY 6 SEED - AS SPECIFIED IN NOTES AND DRAWINGS. 1 __ TOP DRESS W/ 4" HAY MULCH AFTER SEEDING. LOAM AND SEED DETAIL NOT TO SCALE USE EQUIDISTANT TRIANGULAR SPACING FOR PLANTS - FOR ACTUAL SPACING SEE PLANS OR PLANTING SCHEDULE PLANTING SPACING DETAIL NOT TO SCALE BRICK GENTLY HAND -LOOSEN SOIL FROM 10. FURNISH ONE YEAR MANUFACTURER WARRANTY FOR TREES, PLANTS, AND AROUND ROOTBALL WITHOUT I SEVERING MAIN ROOTS. SPREAD GROUND COVER AGAINST DEFECTS INCLUDING DEATH AND UNSATISFACTORY ROOTS ROOTS OVER MOUND OF UNDISTURBED GROWTH, EXCEPT FOR DEFECTS RESULTING FROM LACK OF ADEQUATE SUBGRADE MAINTENANCE, NEGLECT, OR ABUSE BY OWNER, OR ABNORMAL WEATHER CONDITIONS UNUSUAL FOR WARRANTY PERIOD. THE DATE OF FINAL 3" PINEBARK MULCH. PULL MULCH 3"-6" ACCEPTANCE OF ALL COMPLETED PLANTING WORK ESTABLISHES THE END OF AWAY FROM BASE OF PERENNIAL. INSTALLATION AND INITIAL MAINTENANCE PERIOD AND THE COMMENCEMENT REMOVE SAUCER AFTER ONE SEASON. OF THE GUARANTEE PERIOD. 11. ALL TREES WITHIN 5-0" OF WALKWAYS AND SIDEWALKS TO HAVE A 6-8" MOUND WITH EXCAVATED SOIL TO 3" STANDARD BRANCHING HEIGHT. ABOVE FINISHED GRADE. Y f 12. INSPECT ALL AREAS TO BE PLANTED OR SEEDED PRIOR TO STARTING ANY ` ! EXCAVATE HOLE TO DIAMETER 2X Q j,. WIDER THAN ROOTBALL. BACKFILL LANDSCAPE WORK. REPORT ANY DEFECTS SUCH AS INCORRECT GRADING, WITH LOAM. a INCORRECT SUBGRADE ELEVATIONS OR DRAINAGE PROBLEMS, ETC. TO THE 2 -ROOT BALL DIAM. LANDSCAPE ARCHITECT AND ENGINEER PRIOR TO BEGINNING WORK. o COMMENCEMENT OF WORK INDICATES ACCEPTANCE OF SUBGRADE AREAS TO Z BE PLANTED, AND THE LANDSCAPE CONTRACTOR ASSUMES RESPONSIBILITY PERENNIAL PLANTING DETAIL 0 FOR ALL LANDSCAPE WORK. U NOT TO SCALE Q 13. PROVIDE PROPER PREPARATION OF ALL PROPOSED PLANTED AND SEEDED AREAS PER THE NOTES AND SPECIFICATIONS. W Ln 14. ALL PLANT LAYOUT AND ACTUAL PLANTING LOCATIONS ARE TO BE FIELD VERIFIED BY LANDSCAPE ARCHITECT PRIOR TO PLANTING. NOTIFY THE LANDSCAPE ARCHITECT AT A MINIMUM OF 48 HOURS IN ADVANCE PRIOR TO SCHEDULING ANY FIELD INSPECTIONS. 15. BALL AND BURLAP: REMOVE BURLAP AND WIRE BASKETS FROM TOPS OF PLANT TREE PLUMB - BALLS AND FROM TOP HALF OF ROOTBALL AS INDICATED ON DRAWINGS. PRUNE BROKEN OR DEAD o REMOVE PALLETS, IF ANY, BEFORE SETTING. ) I / BRANCHES AS DIRECTED BY LANDSCAPE ARCHITECT 16. POTTED PLANTS: REMOVE THE PLANT FROM THE POT AND LOOSEN OR SCORE I THE ROOTS BEFORE PLANTING TO PROMOTE OUTWARDS ROOT GROWTH INTO THE SOIL. / 17. PLUGS: PLANT UPRIGHT AND NOT AT AN ANGLE. DIG PLANTING HOLES LARGE ENOUGH AND DEEP ENOUGH TO ACCOMMODATE THE ENTIRE ROOT MASS. PLANT PLUGS WITH NO TWISTED OR BALLED ROOTS AND WITH NO ROOTS EXPOSED ABOVE THE GRADE LINE. HAND PACK THE SOIL AROUND THE ENTIRE PLUG ROOT MASS. 18. DIG THE THE PLANTING HOLE TO THE SAME DEPTH AS THE ROOT BALL AND TWO TO THREE TIMES WIDER. SCORE ALL SIDES OF THE HOLE, PLACE THE PLANT IN THE HOLE SO THE TOP OF ROOT BALL IS EVEN WITH SOIL SURFACE. FILL THE HOLE HALFWAY AND THEN ADD WATER ALLOWING IT TO SEEP INTO BACK FILLED MATERIAL. BE SURE TO REMOVE ALL AIR POCKETS FROM BACK FILLED SOIL. DO NOT SPREAD SOIL ON TOP OF THE ROOTBALL. IF SOIL IS EXTREMELY POOR, REPLACE BACK FILL WITH GOOD QUALITY TOP SOIL. AMEND THE SOIL, AS NECESSARY. 19. CREATE A 2" TO 4" BERM AROUND THE EDGE OF PLANTING HOLE WITH REMAINING SOIL TO RETAIN WATER. 20. REMOVE ALL PLANT TAGS AND FLAGS FROM THE PLANTS. 21. MULCH ALL PLANTING BEDS AS INDICATED ON DRAWINGS. UNLESS NOTED OTHERWISE, ALL PLANTS TO RECEIVE 2-3 INCHES OF MULCH. DO NOT PILE OR MOUND MULCH AROUND THE PLANT STEMS OR TRUNK. 22. TRIM BROKEN AND DEAD BRANCHES FROM TREES AND SHRUBS AFTER PLANTING. NEVER CUT A LEADER. 4'0 GUY WEBBING - OR TIE TO STAKE VARIES STAKES TO FIRST WHORL NCHES ❑ 120 DEGREE SLS AND PLACED PLUMB DDED MULCH PIT OR AS INDICATED E TOP THIRD OR >F BURLAP AROUND \LL 4LL SIDES AND BOTTOM L SAUCER ZED PLANTING XTURE US SOIL Plant Schedule Key Botanical Name Common Name Size Spacing Trees LS 2 Liquidam bar styraciflua 'Happidaze' HappiDaze Sweet Gum 2-2.5" Cal. As Shown Ground Cover/Grasses/Perennials AH 10 Amsonia hubrichtii Thread -leaf Bluestar #1 24" O.C. EP 12 Echinacea purpurea 'Ruby Star' Ruby Star Purple Coneflower #1 18" O.C. IVE 12 Iris versicolor Blue Flag #1 24" O.C. PVS 20 Panicum virgatum 'Shenandoah' Shenandoah Switch grass #1 30" O.C. ARSENAL STREET NOTES: 1. IN ANY DISTURBED AREAS THAT WILL NOT BE PLANTED IMMEDIATELY AFTER CONSTRUCTION, SEED WITH GRAIN RYE (SECALE CEREALE) IN THE FALL AS A COVER CROP. PRIOR TO PLANTING IN THE SPRING, REMOVE ANY REMAINING RYE. 2. IN HATCHED AREAS WITH GRASSES AND PERENNIALS, PLANT THE SAME SPECIES IN RANDOM GROUPINGS OF 3-7 TO CREATE A MORE NATURALISTIC APPEARANCE. 3. SEED MIX SHALL BE "HARMONY" SEED MIX FROM COLONIAL SEED. GRAPHIC SCALE 10 0 5 10 20 nn �eeeil V � C � O 0 a=i � G� o c ,�, o Np p k CO �O %_ 4i -ZC1 M M i oaC?0? 3 0 M o 0 U) W ~ ''W^^ VJ � U U a ~ U) Z Q 0 Q Z Z m z W � LINJ ~ n LLJ V o U H a a b, U ; b d i ai -a,- Li U Q O L (D C 0 v o co c9 - m N CO co O M A Q Cb M Q 2E Oa C? o N _ a1 Q - o H i � -0 = � a) L7 O 2 C 0 X rni� Roo®❑®a co 0 N W m 2 w > 0 z 0 Q I- LLJ 0 El LI J 0- Q U 0 Z J Pr0®LLNOL LQ-: SLLO2 15145 4 F-IF- 4 fit ■ ■ ■ TREE PLANTING DETAIL NOT TO SCALE (IM IT11❑11 1 INCH = 10 FEET S N r: C-4 Appendix 7 N N O �I I U U) a C 0 L r) / [n C O C E O U 0 m Lf) In 0 0 U C O C 0 N 0 LO / O N U N •O L_ n 0 c a� c� 42.09 40' RIM: 42.09' Of WEIR: 40.00' INV OUT (BMP):38.00' EX INV OUT (SEWER): 38.04' TREE TO BE REMOVED AND RELOCATED PER TREE WARDEN �P STORMWATER TREE TRENCH TT 1 BOTTOM ELEVATION: 37.3' PRACTICE AREA = 300 SF 8" PERFORATED 42.62 PVC PIPE SEE SUGGESTED PLANT LIST FOR LANDSCAPE ELEMENTS (COORDINATE WITH TREE WARDEN) 42.80 Proposed Street Trees for Tree Trench by Overhead Wires Sotanica/Name Common Name Trees AmelanchierX grandiflora 'Robin Hill' Robin Hill Serviceberry Ginkgo bi/oba Autumn Gold' Autumn Gold Ginkgo Ginkgo bi/oba 'Princeton Sentry Princeton Sentry Ginkgo Liquidambarstyraciflua 'Emerald Sentinel' Emerald Sentinel Sweetgum Cercis canadensis Eastern Redbud STORMWATER TREE TRENCH - TT 2 BOTTOM ELEVATION: 46.7' PRACTICE AREA =400 SF SEE SUGGESTED PLANT LIST FOR LANDSCAPE ELEMENTS (COORDINATE WITH TREE WARDEN) 8" PERFORATED PVC PIPE 20 50 100 SCALE: 1" = 20' / 7.5' ITYPICAL CONNECTION. SEE B1 CROSS SECITON B-B AND ROADWAY PLANS FOR ALTERNATE CONNECTION TREE PIT (TYP.) L L LOCATIONS WILL L L VARY -SEE PLANS 6" VERTICAL L L FLOW LINE GRANITE CURB FLOW LINE A 10, 10' A' �•,•,•2.b'•,• •GRASS •SURFACE •• �. . • .d. • • d .•. . n .•. .• . . n .•. n . • ♦ • .•. .d.•. 7.50R8' II • ti • dy • • ti • dy • • ti • dy • • ti • dy • • ti • dy ♦ • (SEE PLANS) ♦ . . . • ° • • •♦ • • 3 • 3 • SIDEWALK (SEE DETAIL) 3 • ° d If • •5� • ♦ • d • •° • ♦ • d • _° • ♦ • ♦ •d • ♦ • d • •d • • ♦ • • ♦ ♦ ° d ♦A LENGTH v • • v • • v • • IV • IV • . d • . • . • . • . • ♦ • d • • 8" PERFORATED PVC PIPE EXTENT OF GRAVEL UNDER SIDEWALK STORMWATER TREE TRENCH PLAN VIEW SEE SECTION B CLEANOUT WITH NOT TO SCALE VENTED CAP WEIR WALL AND CURB BOX 12" OUTLET PIPE TREE PLANTINGS OUTLET PIPE TO DRAINAGE SYSTEM SEE SCHEDULE 8" PERFORATED PVC DISTRIBUTION PIPE CONC. SIDEWALK (SEE DETAIL) TREE PLANTINGS HDPE PERFORATED PIPE I UKMVVA I tK I Ktt I KtN(. H NOT TO SCALE GEOTEXTILE FILTER FABRIC TREE TRENCH SCHEDULE: BMP Inlet (Catch Basin Rim) Top of Curb Weir Wall Elev. Outlet Elev. 12" Pipe (D) Depth of Stone in Practice Area Length of Trench Length of 8" Perf. Pipe ft Bottom System 8" Perf. Pipe Invert Outlet Pipe Size in Volume c Estimated Seasonal High Ground Water TT 1 42.09 42.59 40.00 38.04 29.4 300 40 47 37.30 37.8 12 267 35.3 TT 2 51.36 51.86 49.30 47.95 28.2 400 50 53 46.70 47.2 12 343 44.7 0Z c4 / O /J CO Q O / 441 / co O z �o AIZ 4z- 9� O /� V � Q .25 DIVERSION STRUCTURE RIM: 51.36' WEIR: 49.30' INV OUT (BMP): 47.20' 51.55 INV OUT (STORM): 47.95' 50' VERTICAL CURB BY OTHERS (SEE DETAIL) DIVERSION SEE PLANS FOR CATCH BASIN _ TREE LOCATIONS (SEE DETAIL) INLET MULCH 1"CURB REVEAL (TYP.) SIDEWALK AND SUBBASE SEE DETAIL (VARIES BASED ON TRENCH ALIGNMENT) EXCAVATION OF SIDEWALK AND SUBBASE TREE PLANTING SOIL 2.5' MIN. 5' 14" VARIES 3/4" UNIFORMLY 00 '� o��0Q�qq�,� oo GRADED, CLEAN 00 00 2 5 �o� CRUSHED WASHED D o AGGREGATE, TYP. 0 1.0'0 o 3/8" WASHED PEA GRAVEL 0 p obb aboo pO 0Cf�0 o oto63" MIN.p 4' (MIN.) 3 MIN." 0 • �/ UNCOMPACTED, LEVEL, PIPE WITH 90 STABLE SUBGRADE \��\ �� 6" PERFORATED DEGREE BEND SCARIFIED TO 3" DEPTH PVC PIPE NON -WOVEN GEOTEXTILE ON TOP OF CRUSHED VARIES STONE AND SIDES OF SEE PLANS TREE PLANTING SOIL NOTES: 1. PLANTING SOIL DEPTH VARIES BASED UPON TOP OF GRAVEL AND PROPOSED SIDEWALK GRADE. 2. -'.'GRAVEL DEPTH VARIES BASED UPON INLET PIPE INVERT, PIPE SLOPE AND PIPE COVER REQUIREMENTS. STORMWATER TREE TRENCH CROSS SECTION B-B' NOT TO SCALE • a - CEMENT ° • • •° • 6 : • • ° •• • CONCRETE • • ° ° • d 0 0 0 0 0 TYPE 'B' GRAVEL 8" BORROW REQUIREDORDINARY FILL AS BORROW�C JC CLEAN CRUSHED AGGREGATE TREE TRENCH SIDEWALK DETAIL PROVIDE 1' DEEP CAST IRON CURB BOX MOUNTED FLUSH WITH GROUND CONCRETE SEE SIDEWALK DETAIL AGGREGATE, SEE TREE TRENCH DETAIL 8" PERFORATED PVC DISTRIBUTION PIPE 8" • NOT TO SCALE J_ 4" PVC THREADED CAP 4" DIA. (MIN) HDPE PIPE ELBOW ADAPTER FOR 8" PVC UNDERDRAIN PIPE TO 4" CLEAN OUT CONNECTION TO UNDERDRAIN PIPE TREE TRENCH CLEANOUT DETAIL FRAME AND GRATE / 24" SQUARE OPENING DIVERSION WEIR WALL 6" MIN. ' LOW FLOW OUTLET PIPE TO BMP I NOT TO SCALE NOTES: 1. SEE PRECAST DRAINAGE CATCH BASIN FOR CATCH BASIN CONSTRUCTION SPECIFICATION. 2. PIPE DIAMETER AND INVERT ELEVATION PER SITE PLAN AND/OR SCHEDULE. 3. WEIR WALL TO BE ADJUSTABLE AND CONSTRUCTED OF BRICK AND MORTAR BY CONTRACTOR AFTER CATCH BASIN INSTALLATION. 4. TOP OF WEIR WALL ELEVATION WITHIN THE DIVERSION CATCH BASIN PER SITE PLAN AND/OR SCHEDULE. FRAME AND GRATE WEIR WALL DRAIN PIPE TO BMP OVERFLOW PIPE FTO RESOURCE A ----- PLAN OVERFLOW PIPE TO RESOURCE CONSTRUCT WEIR 12" FROM OUTLET PIPE SECTION A -A PENETRATION PARALLEL TO THE OUTLET PIPE FACE (AS SHOWN IN PLAN VIEW) DIVERSION CATCH BASIN DETAIL NOT TO SCALE CLIENT: TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS 124 ORCHARD STREET WATERTOWN, MA 02472 PHONE: 617-924-1379 PROJECT: RECONSTRUCTION OF COMMON STREET WATERTOWN, MA PREPARED BY: �N3 RL!DTEC H ENGINEERING 300 TRADE E TER, SUITE 5580. WOBURN, MA 01801 T: 781-933-4800 F: 781-933-4801 HOTSICY Witten GTOUP Sustainable Environmental Solutions 24 Federal Streef - fGrfth Ffo,7r • Bosia . MA P24 f 0 W*WJWAr&jjWhMA. tM PROFESSIONAL CIVIL ENGINEER FOR WORLDTECH ENGINEERING, LLC RESPONSIBLE FOR ROADWAY DESIGN PROFESSIONAL CIVIL ENGINEER FOR HORSLEY WITTEN GROUP RESPONSIBLE FOR STORMWATER DESIGN NO. DATE REVISION SCALE: 1 " = 20' DATE: XXX 2017 PROJECT NO. 15-001.02 DESIGNED BY: GSG/JB CHECKED BY: RAC DRAWING TITLE: STORMWATER MANAGEMENT PLAN SHEET N0. 16 �F 26 CLIENT: v N N O �I 0 J V) O' cn c 0 E E O U m Lo Lo / C� O U I c O c O L_ N j 0 Lo Lo 1-11 L0 O N -11 N O s_ 6 0 C N 17 4" PERFORATED PVC UNDERDRAIN DISTAL INVERT: 24.65' L: 35' S: 0.50% HW OUTLET STRUCTURE RIM: 28.25' INV IN (E): 24.75' INV OUT (W): 24.65' 12" PVC - L: 30' \ 12" PVC - L: 22' INV IN: ±22.30' HW DMH#7C FOREBAY RIM: 26.60' BOTTOM EL: 28.00' / INV IN (N): 23.60' PONDING DEPTH: 12" 12" PVC INV IN (E): 23.60' AREA: 110 SF L: 88' INV OUT (W): 23.50' VOLUME: 110 CF NOTE: STRUCTURES LABELED WITH THE PREFIX'HW' ARE PROPOSED BY HORSLEY WITTEN-STRUCTURES LABELED WITH THE PREFIX 'WT' ARE PROPOSED BY WORLDTECH AND SHOULD BE COORDINATED WITH WORLDTECH'S GRADING AND DRAINAGE SCHEDULE. ANY INCONSISTENCIES SHOULD BE DISCUSSED WITH HORSLEY WITTEN FOR CONFIRMATION. b BIORETENTION BOTTOM EL: 27.75' TOP OF BERM: 29.00' PONDING DEPTH: 6" AREA: 490 SF ' 8" PVC L: 40' SECTION RIM: 30.68' INV: 28.50' _ . 12" PVC OUT (W): 27.68' WT CIT #4 0 20 50 100 SCALE: 1" = 20' HW DMH#7B 8" PVC IN (S): 28.80' 8" PVC OUT (W): 28.70' 8" PVC L: 9' WT DMH#7A RIM: 30.85' 12" PVC IN (E): 27.60' 12" PVC IN (S): 26.67' 8" PVC OUT (N): 28.85' 12" PVC OUT (W): 26.50' DIVERSION WEIR: 29.10' J • 12" PVC L: 15' 0005 O 2 0),� 1. CONTRACTOR RESPONSIBLE FOR SLOPE STABILIZATION AND SAFETY MEASURES DURING CONSTRUCTION. SIDE SLOPES TO BE 4:1 MAXIMUM SLOPE. 2. LOAM AND SEED SIDE SLOPES PER SPECIFICATIONS; THE REMAINING DISTURBED AREA SHALL BE LANDSCAPED PER PLANTING PLAN. VERTICAL EXCAVATION SLOPE PREFERRED OR ALTERNATIVE SLOPE (MAX 1:1) BIORETENTION PLANTINGS (SEE PLANTING PLAN) 6" PONDING r DEPTH RETENTION SOIL 11444449 PEA GRAVEL 3' \BIORETENTION 'i MIN CLEANOUT OVERFLOW OUTLET RIM INV: 28.25' 3 MIN TAPER BIORETENTION SOIL T r FROM OUTLET STRUCTURE ty _ vzzzzzzzw Iz/ V :• • • : • • .- APPROVED NATIVE BACKFILL INV: 24.65' UNDERDRAIN MATERIAL BIORETENTION FACILITY DETAIL 0.50% SLOPE GRAVEL STONE BLANKET & FILTER FABRIC AROUND UNDERDRAIN ONLY NOT TO SCALE SEE SITE PLAN 2" BEDDING COURSE WITH CLEAN SEE SITE SHARP SAND (ASTM 33) AND COIR A A PLAN FIBER, SEE SPECS PLANTABLE CONCRETE SYSTEM - SEE SPECIFICATIONS PLAN VIEW 1.5" I I 6" MIN. ----------- --- -- -- -- ----- -- 6" CRUSHED STONE RESERVOIR SUBBASE SLOPED TO MATCH MEETING AASHTO 57 PAVER SLOPE 3.3-5% COMPACTED SUBGRADE, 95% FILTER FABRIC (NON -WOVEN MIRAFI MODIFIED PROCTOR DENSITY 140N OR APPROVED EQUIVALENT) NOTES: SECTION A -A 1. FILTER FABRIC AROUND PERIMETER AND BOTTOM OF STONE BASE. KEY IN MINIMUM 611. 2. MATERIALS SHALL PASS THE FOLLOWING SIEVE ANALYSES: PLANTABLE CONCRETE SYSTEM NOT TO SCALE 4:1 MAX CONTINUE 6" PONDING FOREBAY PLANTABLE SLOPE PAVERS UP DEPTH BOTTOM CONCRETE SYSTEM SLOPE (SEE DETAIL) - - - - - - --L07rl-,I, - Sri 2.0' SEE LANDSCAPE PLANS FOR SLOPE TREATMENT NOTES: 1. SEE SITE PLAN FOR FOREBAY DIMENSIONS, GRADING, AND ELEVATIONS. SEDIMENT FOREBAY SECTION NOT TO SCALE � CROWN SLOPE wry Tri If m ,. 1100 NOTE: 1. STABILI-]ED STONEDUST BINDER TO BE ORGANIC -LOCK. 2. COMPACT SUBGRADE TO 95% MODIFIED PROCTOR DENSITY. 3. COMPACTED AGGREGATE PER MANUFACTURER'S RECOMMENDATIONS. 4. 5. BACKFILL ALONG PATH EDGE TO MATCH EXISTING GRADES AS NECESSARY. ENSURE POSITIVE DRAINAGE OFF PATH. 6. SEE PLANS FOR PATH WIDTH. STABILIZED STONEDUST PATH NOT TO SCALE 4 WEIR PLATE ANCHOR DETAIL 8" PVC TO DMH#7B INV OUT: 28.75' 12" PVC TO DMH#7C INV OUT: 26.50' 4" 304 STAINLESS STEEL PLATE WEIR INV: 29.10' PLAN VIEW 12" PVC HAND -TAMP A 45' EDGE ON BOTH SIDES OF THE PATH r- BACKFILL AS NEEDED.ENSURE DRAINAGE OFF THE PATH. � L>ltll�IU� SEELANDSCAPE PLANS COMPACTED SUBGRADE ""ANCHOR BOLT (TYP.) 4 HOLE (TYP.) FROM C136 2" INV IN: 27.60' F" 6" 3" - 12" PVC FROM CIT#4 GROUT INV IN: 26.67' EPDXY TO A FLOOR DMH#7A DETAIL �V \V %V LLLLLL LLLLLLLLLLL LLLLLL LLLLLLLLLLL LL ' ' 'L' ' ' ' LLL LILL EXTEND PAVERS BENEATH LLL L LL LLAND AROUND SIDES OF FES LLL L LL LLLLLLLLLLLLLL • iL LLL LLLLLLLLLLLLLL LLL LLLI I I -LLLLLL LLLLI LL PLANTABLE _LLLLL L LLLLL LL CONCRETE _LLLLL J, LLFLLLLLL LL (SEE DETAIL)-LLLLL �LLLLLLL LL_L_L_L_L_LLLLLL LLLLLL LLLLLLLLLLL LIIII IIII PLAN NON -WOVEN FILTER FABRIC 6" CRUSHED 2" SAND STONE BEDDING TLE PLANTABLE IPE FES CONCRETE PAVERS KEY -IN ENDS OF SECTION FILTER FABRIC , FOREBAY OUTFALL DETAIL NOT TO SCALE rrrrrl A rrrrrrrr \\\\\\\\\\\\\\\N A -rrrrrrrr rrrrrrrrrl rrrrrrrrrrrr \> > >: -rrrrrrrrrrrr-I I I rr-r-r-r-r-r -rrrrrrrrrrrrrrr "rrrr-r-r50' rrrrrrrr- rrrrrrrrrrrrrrrr cr•rr r•r•r•r•r•r•I` "rrrrrrrrrrrrrrr rrrr rrrrr rrrrrrr --rrFrl-I-I-I-rrrrrrrrr r�rrrrrrrrr rrBrIOrRrErrr rN-rrOREBAY rr -r4 1_EL: 27.75,rr EL: 28.00' "rrrrFFrI Irr -' -rrrrrrrrrrrrr rrrrfrjrrrrr rrrrrrrrrr, -rrrrrrrrrrrrrrr r,rrr rrrrr rrrrrrrrr-r "rrrrrrrrrrrrrrr -r rrr rrrrrrrrrr rrrrrrrrrrrrrrrr -rr EL 28 50' rrrrrrrrrr rrrrrrrrrrrrrrrr "rrr rrrrrrrrrr rrrrrrrrrrrrrrr �r � _�� -rrrrrrrrrrrrr \ \ r7777777r17 \\\\\\\\\I X \ -rrrrrrrr \\\\\\\\\\\\Q rrrrrrrr 2i _ PLAN VIEW 4 MAX FOREBAY 1 EL: 28.00' NOT TO SCALE NON -WOVEN 4' FILTER FABRIC r 4 MAX - SECTION A - A EXTEND PAVERS 4' BEYOND TOE OF SLOPE N KEY -IN ENDS OF FILTER FABRIC PLANTABLE CONCRETE SPILLWAY NOT TO SCALE 4" 304 STAINLESS STEEL PLATE WEIR INV: 29.10' --------------------- \_ 8" PVC TO DMH#7B INV OUT: 28.75' 12" PVC TO DMH#7C INV OUT: 26.50' SECTION A -A TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS 124 ORCHARD STREET WATERTOWN, MA 02472 PHONE: 617-924-1379 PROJECT: RECONSTRUCTION OF COMMON STREET WATERTOWN, MA PREPARED BY: WA RL�TcC ENGINEERIN 00 TRADECENTER, SUITE 5580 OBURN, MA 01801 781-933-4800 781-933-4801 Horsley Witten Group Sustainable Environmental Solutions 24 Federal Streef fGrfth Ffo,7r • Bomoa . MA P24 f f1 wsvw.�wrsrayw,Yt�ra.,:aln PROFESSIONAL CIVIL ENGINEER FOR WORLDTECH ENGINEERING, LLC RESPONSIBLE FOR ROADWAY DESIGN PROFESSIONAL CIVIL ENGINEER FOR HORSLEY WITTEN GROUP RESPONSIBLE FOR STORMWATER DESIGN NO. DATE REVISION SCALE: 1 " = 20' DATE: XXX 2017 PROJECT NO. 15-001.02 DESIGNED BY: GSG/JB CHECKED BY: RAC DRAWING TITLE: STORMWATER 12" PVC FROM C136 MANAGEMENT INV IN: 27.60' 12" PVC FROM CIT#4 INV IN: 26.67' PLAN SHEET No. 16 �F 26 CLIENT: 3 N N O I I g V) O' 0 0 Cn c O E O U c� m LO LO / 0 U c O c 0 aj LO LO LO O N En U N O 1_ n 6 0 a� 17 BONNET BOLT Round -About Plant List �F �g06 00� 5S P Key Botanical Name Common Name Size Spacing Shrubs RAG 52 Rhus aromatica 'Gro-Low' Gro-Low Fragrant sumac #2 As Shown Ground Cover/Grasses/Perennials CA 250 Carex appalachica Appalachian Sedge plugs 12" O.C. CPE 250 Carex pensylvanica Pennsylvania Sedge plugs 12" O.C. CPSS 12 Coreopsis pubescens 'Sunshine Superman' Star Tickseed #1 18" O.C. MUS 150 Muscari armeniacum Grape Hyacinth bulbs See Notes NOTES: 1. PLANT THE GRAPE HYACINTH BULBS IN GROUPS OF 2-4 EVENLY DISTRIBUTED ACROSS THE PLANTER AMONGST THE SEDGES, PERENNIALS AND SUMAC. 2. FOR THE HATCHED AREA WITH SEDGES, SPACE THE SEDGES EVENLY ACROSS THE REST OF THE PLANTER. 3. PLANT THE TICKSEED AMONGST THE SUMAC CLOSER TO THE EDGE OF THE PLANTER THAN THE MIDDLE, AS SHOWN ON THE PLANS. -12 CPSS • • 1 F- CO O 250+250+150 CA+CPE+MUS 52 RAG 0 20 50 100 SCALE: 1" = 20' Planter Plant List Key Botanical Name Common Name Size Spacing Shrubs CSAF 5 Cornus sericea Arctic Fire' Arctic Fire Red Twig Dogwood #3 As Shown Ground Cover/Grasses/Perennials CAM 50 Carex amphiloba Creek Sedge #1 9" O.C. HADS 20 Heuchera americana 'Dale's Strain' Dale's Strain Coral Bells #1 18" O.C. MUS 20 Muscari armeniacum Grape Hyacinth bulbs See Notes NOTES: 1. PLANT THE GRAPE HYACINTH BULBS IN GROUPS OF 2-4 EVENLY DISTRIBUTED ACROSS THE PLANTER AMONGST THE SEDGES AND PERENNIALS. 2. FOR THE HATCHED AREA WITH SEDGES AND PERENNIALS, PLANT THE CORAL BELLS IN SMALL GROUPS OF 2-4 AND SPACE THE SEDGES EVENLY ACROSS THE REST OF THE PLANTER. SRC °i RFFT N 7_. C CO / — IJA48�q 0 10 25 50 SCALE: 1" = 10' Ti �e#39 *32 e#3/ TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS 124 ORCHARD STREET WATERTOWN, MA 02472 PHONE: 617-924-1379 PROJECT: RECONSTRUCTION OF COMMON STREET WATERTOWN, MA PREPARED BY: . RL!DTEC ENGINEERIN 00 TRADECENTER, SUITE 5580 OBURN, MA 01801 781-933-4800 781-933-4801 Horsley Witten GTOUP Sustainable Environmental Solutions 24 Federal 5treef �rfth Ffvpr • BORtWi, A1,0. P24}0 PROFESSIONAL CIVIL ENGINEER FOR WORLDTECH ENGINEERING, LLC RESPONSIBLE FOR ROADWAY DESIGN PROFESSIONAL CIVIL ENGINEER FOR HORSLEY WITTEN GROUP RESPONSIBLE FOR STORMWATER DESIGN NO. DATE REVISION SCALE: 1 " = 20' DATE: XXX 2017 PROJECT NO. 15-001.02 DESIGNED BY: HLC CHECKED BY: JB/BRK DRAWING TITLE: PLANTING PLAN (2 OF 2) SHEET No. 16 �F 26 GENERAL PLANTING NOTES: RETAIN SAME FINISH GRADE AFTER PLANTING AS ORIGINAL GRADE BEFORE DIGGING 1. THE FOLLOWING NOTES ARE PROVIDED AS GENERAL PLANTING GUIDELINES ONLY. THOROUGHLY REVIEW THE PROJECT SPECIFICATIONS FOR ALL LANDSCAPE REQUIREMENTS PRIOR TO THE COMMENCEMENT OF ANY LANDSCAPE WORK. SUBMIT IN WRITING TO THE ENGINEER/LANDSCAPE ARCHITECT ANY QUESTIONS OR CLARIFICATIONS REQUIRED AT A MINIMUM OF 30 DAYS PRIOR TO ORDERING ANY MATERIALS OR BEGINNING ANY LANDSCAPE CONSTRUCTION. 2. SUBMIT TO THE ENGINEER/LANDSCAPE ARCHITECT FOR REVIEW AND APPROVAL ALL REQUIRED LANDSCAPE SUBMITTALS AS DESCRIBED IN THE SPECIFICATIONS INCLUDING A PLANT LIST WITH PLANT SI❑E AND QUANTITIES TO BE ORDERED PRIOR TO DELIVERY TO THE PROJECT SITE. 3. FURNISH AND INSTALL ALL PLANTS AS SHOWN ON THE DRAWINGS AND IN THE SI❑E AND QUANTITIES SPECIFIED ON THE PLANTING SCHEDULE. PLANT SUBSTITUTION SELECTION MUST BE APPROVED BY BIOLOGIST OR LANDSCAPE ARCHITECT PRIOR TO INSTALLATION. 4. PLANTS TO BE GROWN UNDER CLIMATIC CONDITIONS SIMILAR TO THOSE IN THE LOCALITY OF THE PROJECT FOR AT LEAST TWO (2) YEARS. USE HEALTHY NURSERY GROWN PLANTS, FREE OF DISEASE, INSECTS, AND PESTS. EGGS OR LARVAE, AND HAVE A WELL DEVELOPED ROOT SYSTEM. 5. PROCEED WITH PLANTING ONLY WHEN EXISTING AND FORECASTED WEATHER CONDITIONS PERMIT. SUBMIT TO THE ENGINEER/LANDSCAPE ARCHITECT IN WRITING THE PROPOSED PLANTING SCHEDULE. OBTAIN APPROVAL OF PLANTING SCHEDULE FROM THE ENGINEER/LANDSCAPE ARCHITECT PRIOR TO PERFORMING ANY WORK. 9. PLANTING UNDER FROI EN CONDITIONS IN EITHER THE SPRING OR FALL WILL NOT BE PERMITTED. ANY DEVIATION FROM THE SPECIFIED PLANTING DATES IS UNDERTAKEN AT SOLE RISK OF THE CONTRACTOR AND IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO PROVIDE ANY ADDITIONAL MAINTENANCE AND WATERING WHICH MAY BE REQUIRED TO ENSURE SATISFACTORY PLANT AND SEED ESTABLISHMENT. 10. INSPECT ALL AREAS TO BE PLANTED OR SEEDED PRIOR TO STARTING ANY LANDSCAPE WORK. REPORT ANY DEFECTS SUCH AS INCORRECT GRADING, INCORRECT SUBGRADE ELEVATIONS OR DRAINAGE PROBLEMS, ETC. TO THE ENGINEER/LANDSCAPE ARCHITECT PRIOR TO BEGINNING WORK. COMMENCEMENT OF WORK INDICATES ACCEPTANCE OF SUBGRADE AREAS TO BE PLANTED, AND THE LANDSCAPE CONTRACTOR ASSUMES RESPONSIBILITY FOR ALL LANDSCAPE WORK. 11. PROVIDE PROPER PREPARATION OF ALL PROPOSED PLANTED AND SEEDED AREAS PER THE NOTES AND SPECIFICATIONS. 12. PLUGS: PLANT UPRIGHT AND NOT AT AN ANGLE. DIG PLANTING HOLES LARGE ENOUGH AND DEEP ENOUGH TO ACCOMMODATE THE ENTIRE ROOT MASS. PLANT PLUGS WITH NO TWISTED OR BALLED ROOTS AND WITH NO ROOTS EXPOSED ABOVE THE GRADE LINE. HAND PACK THE SOIL AROUND THE ENTIRE PLUG ROOT MASS. N N O 13. DIG THE THE PLANTING HOLE TO THE SAME DEPTH AS THE ROOT BALL �I AND THREE TIMES WIDER. SCORE ALL SIDES OF THE HOLE, PLACE THE PLANT IN THE HOLE SO THE TOP OF ROOT BALL IS EVEN WITH SOIL SURFACE. FILL THE HOLE WITH LOAM BORROW AND RE -HANDLED g TOPSOIL AND THEN ADD WATER ALLOWING IT TO SEEP INTO BACK V) FILLED MATERIAL PER THE SPECIFICATIONS. BE SURE TO REMOVE ALL AIR POCKETS FROM BACK FILLED SOIL. DO NOT SPREAD SOIL ON TOP 0 OF THE ROOTBALL. 0 +, 14. CREATE A 2" TO 4" BERM AROUND THE EDGE OF PLANTING HOLE WITH rn REMAINING SOIL TO RETAIN WATER. C O E 15. REMOVE ALL PLANT TAGS AND FLAGS FROM THE PLANTS. E j 16. MULCH ALL PLANTING BEDS AS INDICATED ON DRAWINGS. UNLESS NOTED OTHERWISE, ALL PLANTS TO RECEIVE 2-3 INCHES OF MULCH. O DO NOT PILE OR MOUND MULCH AROUND THE PLANT STEMS OR m TRUNK. LO LO 17. TRIM BROKEN AND DEAD BRANCHES FROM TREES AND SHRUBS AFTER PLANTING. NEVER CUT A LEADER. C� 18. DO NOT USE FERTILI❑ERS, PESTICIDES OR CHEMICALS DURING Lj PLANTING AND MAINTENANCE OF THE STORMWATER MANAGEMENT I AREAS. c O C ° GENERAL SEEDING NOTES: N 0 1. ALL AREAS THAT ARE DISTURBED AND/OR GRADED DURING CONSTRUCTION ARE TO BE BROUGHT TO FINISHED GRADE WITH AT LEAST 4" MINIMUM DEPTH OF LOAM BORROW AND RE -HANDLED TOPSOIL AND SEEDED WITH A QUICK GERMINATING GRASS SEED LO AS SPECIFIED IN THE PLANS AND SPECIFICATIONS. O N rn U N O L_ a_ E 0 s✓ N 12-18" O.C. ,k PLANT 12-18" O.C. CELL PACK BACKFILL BY HAND PLANT 12-18" ON CENTER AS NOTED IN PLANT LIST REMOVE BURL, FROM TOP Ar SIDES OF ROOTBA AND PROPERI DISPOSE c 6" n SCARIFY SIDES AND BOTTOM OF PLANTING HOLE REMC PLUG PLANTING DETAIL NOT TO SCALE 3 -DIAMETER OF f ROOTBALL SHRUB PLANTING DETAIL NOT TO SCALE RE ROOTBALL' = POT-BOUND �JOSEN ROOTS RUNE BROKEN OR DEAD RANCHES AS DIRECTED Y LANDSCAPE ARCHITECT _ANT SHRUB PLUMB TOP OF ROOTBALL TO MATCH FINISH GRADE WITHIN 1" 3" SHREDDED MULCH AS INDICATED, DO NOT PILE AGAINST SHRUB STEMS 2%4" SOIL BERM LOAM BORROW AND RE -HANDLED TOPSOIL UNDISTURBED PERVIOUS SOIL CONTAINER PLANT ROOTBALL TREATMENT NOT TO SCALE v 3 -ROOT BALL DIAMETER GENTLY HAND -LOOSEN SOIL FROM AROUND ROOTBALL WITHOUT SEVERING MAIN ROOTS. SPREAD ROOTS OVER MOUND OF UNDISTURBED SUBGRADE 3" PINEBARK MULCH. PULL MULCH 3%6" AWAY FROM BASE OF PERENNIAL. REMOVE SAUCER AFTER ONE SEASON. MOUND WITH EXCAVATED SOIL TO 3" ABOVE FINISHED GRADE. LOAM BORROW AND RE -HANDLED TOPSOIL. PERENNIAL PLANTING DETAIL NOT TO SCALE FINISH LOAM BORROW AND RE -HANDLED •- • I I DRAWINGSIL 4" SEED - AS SPECIFIED IN AND SPECIFICATIONS. 191snw, LOAM AND SEED DETAIL PLANT TREE PLUMB - _ GRADE PRUNE BROKEN OR DEAD BRANCHES AS DIRECTED BY LANDSCAPE ARCHITECT NYLON GUY WEBBING - STAPLE OR TIE TO STAKE SEE SPECIFICATIONS FOR STAKING 3" SHREDDED MULCH IN TREE PIT REMOVE BURLAP FROM TOP AND SIDES OF ROOTBALL AND PROPERLY DISPOSE OF SCORE ALL SIDES AND BOTTOM OF HOLE 2%4" SOIL SAUCER LOAM BORROW AND RE -HANDLED TOPSOIL PERVIOUS . 3 EDIAMETER OF ROOTBALL TREE PLANTING DETAIL NOT TO SCALE NOT TO SCALE USE EQUIDISTANT TRIANGULAR SPACING FOR PLANTS - FOR ACTUAL SPACING SEE PLANS OR PLANTING SCHEDULE PLANTING SPACING DETAIL NOT TO SCALE BOULDER GRADE_ — SET BOULDER 6" IN GRADE AND BACKFILL SO THERE IS NO MOVEMENT OF STONE COMPACTED AGGREGATE BASE .r-111111= 11=111110111111=111111=111111=111111=111111=111111=111111llll-IIIIII-IIIIII-IIIIII-IIIIII-IIIIII-IIIIII-IIIIII-IIIIII=111111=1111 . -Ililll_111110 =1=111111=uiIIl=111111=111111=111111=iiiiii= �: - . —null— =urns — NOT TO SCALE Master Plant List Key Botanical Name Common Name Size Spacing Trees NS 4 Nyssa sylvatica Tupelo 2-2.5" cal. As Shown QB 2 Quercus bicolor Swamp White Oak 2.5-3" cal. As Shown Shrubs CSAF 12 Cornus sericea 'Arctic Fire' Arctic Fire Red Twig Dogwood #3 As Shown HQPW 17 Hydrangea quercifolia 'Pee Wee' Pee Wee Oakleaf Hydrangea #5 As Shown IGC 20 flex glabra 'Compacta' Compact Inkberry #5 As Shown RAG 94 Rhus aromatica 'Gro-Low' Gro-Low Fragrant sumac #2 As Shown Ground Cover/Grasses/Perennials AH 15 Amsonia hubrichtii Threadleaf Bluestar #1 24" O.C. CAM 250 Carex amphiloba Creek Sedge plugs 9" O.C. CA 350 Carex appalachica Appalachian Sedge plugs 12" O.C. CPE 250 Carex pensylvanica Pennsylvania Sedge plugs 12" O.C. CPL 100 Carex platyphylla Silver Sedge plugs 12" O.C. CPSS 12 Coreopsis pubescens 'Sunshine Superman' Star Tickseed #1 18" O.C. HADS 20 Heuchera americana 'Dale's Strain' Dale's Strain Coral Bells #1 18" O.C. LS 20 Liatris spicata Blazing Star #1 24" O.C. MUS 270 Muscari armeniacum Grape Hyacinth bulbs See Notes OFF 20 Oenothera fruitcosa 'Fireworks' Fireworks Sundrops #1 18" O.C. PD 20 Penstemon digitalis Beardtongue #1 18" O.C. RFF 20 Rudbeckia fulgida var. fulgida Black -Eyed Susan #1 18" O.C. SH 53 Sporobolus heterolepis Prairie Dropseed #1 24" O.C. VW 100 Viola walteri 'Silver Gem' Prostrate Blue Violet plugs 12" O.C. NOTE: MASTER PLANT LIST INCLUDES ALL PLANTS FOR PLANTING BEDS AND BIORETENTION AREA. CLIENT: TOWN OF WATERTOWN DEPARTMENT OF PUBLIC WORKS 124 ORCHARD STREET WATERTOWN, MA 02472 PHONE: 617-924-1379 PROJECT: RECONSTRUCTION OF COMMON STREET WATERTOWN, MA US09.11V0IIINM,A WA )RL! DT ENGINEERIN 00 TRADECENTER, SUITE 5580 OBURN, MA 01801 781-933-4800 781-933-4801 Horsley Witten TOUp UlAigiLLID Sustainable Environmental Solutions 24 Fedemr Sues; , Fe.?? Floor • Bosian. 119 71 f 0 WW*J ?Arayw,tW . eo � PROFESSIONAL CIVIL ENGINEER FOR WORLDTECH ENGINEERING, LLC RESPONSIBLE FOR ROADWAY DESIGN PROFESSIONAL CIVIL ENGINEER FOR HORSLEY WITTEN GROUP RESPONSIBLE FOR STORMWATER DESIGN NO. I DATE I REVISION SCALE: 1 1 " = 20' DATE: I XXX 2017 PROJECT NO. 1 15-001.02 DESIGNED BY: I HLC CHECKED BY: I JB/BRK DRAWING TITLE: PLANTING DETAILS (1 OF 1) SHEET N0. 1 7 OF 26