Stormwater Management Program (SWMP) Town of Boylston 221 Main Street MA 01505 EPA NPDES Permit Number MAR041095 Updated October 2020 Table of Contents Tighe&Bond This Stormwater Management Plan is based on the EPA’s Template and is designed to be updated annually based on the progress of the Town’s Stormwater Management Program. Tighe & Bond has added language and information and made minor adjustments to the template based on our best professional judgement. Page numbers have not been noted in the Table of Contents below because they will change annually. FY 2019-2023 Small MS4 Permit 5-Year Workplan Certification Background Stormwater Regulation Permit Program Background Stormwater Management Program (SWMP) Town Specific MS4 Background Small MS4 Authorization Stormwater Management Program Team Receiving Waters Eligibility: Endangered Species and Historic Properties Minimum Control Measures MCM 1: Public Education and Outreach MCM 2: Public Involvement and Participation MCM 3: Illicit Discharge Detection and Elimination (IDDE) Program MCM 4: Construction Site Stormwater Runoff Control MCM 5: Post Construction Stormwater Management in New Development and Redevelopment MCM 6: Good Housekeeping and Pollution Prevention for Permittee Owned Operations TMDLs and Water Quality Limited Waters Phosphorus - Assabet River TMDL Lake and Pond Phosphorus TMDL - Northern Blackstone Lakes (Newton Pond) Town of Boylston Stormwater Management Program i Table of Contents Tighe&Bond Appendices Appendix A Delegation of Authority Letter Appendix B Town Specific MS4 Background Appendix C Notice of Intent, System Map and Authorization to Discharge Letter from EPA Appendix D Endangered Species Act Eligibility Criteria Documentation Appendix E Historic Properties Eligibility Criteria Documentation Appendix F Plan Amendment Log Appendix G Reference Documents Appendix H Annual Reports and Reporting Requirements Appendix I Lake Phosphorus Control Plan Record Keeping Town of Boylston Stormwater Management Program ii Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan A hardcopy version of this Workplan may be retained by the Town and contain the most up-to-date documentation of completed requirements FY19 FY20 FY21 FY22 FY23 Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 May 2018 - June 2019 July 2019 - June 2020 July 2020 - June 2021 July 2021 - June 2022 July 2022 - June 2023 FY19 FY20 FY21 FY22 FY23 Reporting Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Notice of Intent Oct. 1, 2018 R Annual Report Annually on Sept 30 R R o o June 30, 2019 - update Prepare Stormwater Management Plan annually R R o o o FY19 FY20 FY21 FY22 FY23 MCM 1: Public Education Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Distribute two messages at MCM 1 Requirement : Message to residents on least one year apart by June stormwater topics of significance. 30, 2023. Target to distribute R o in PY1 and PY3 per NOI. Impaired Waters/TMDL Requirement : Assabet River and Northern Blackstone Lakes Phosphorus TMDLs. Seasonal Message on stormwater topics of significance. Annual spring messages will encourage proper disposal Distribute three messages of grass clippings and the use of slow release and per year each year, one in R R o o o phosphorus-free fertilizers. Annual summer messages the spring, summer and fall will encourage proper pet waste management, noting applicable Town Bylaws where appropriate. Annual fall messages will encourage proper disposal of leaf litter. Updated October 2020 Page 1 of 7 Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan FY19 FY20 FY21 FY22 FY23 MCM 1: Public Education (cont.) Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Distribute two messages at MCM 1 Requirement : Message to businesses, least one year apart by June institutions and commercial facilities on stormwater 30, 2023. Target to distribute R o topics of significance. in PY2 and PY4 per NOI. MCM 1 Requirement : Message to developers and Distribute two messages at construction companies on stormwater topics of least one year apart by June significance, including proper sediment and erosion 30, 2023. Target to distribute R o control management practices. in PY1 and PY3 per NOI. Distribute two messages at MCM 1 Requirement: Message to industrial facilities least one year apart by June on stormwater topics of significance, including proper 30, 2023. Target to distribute o o maintenance of parking lot surfaces. in PY2 and PY4 per NOI. FY19 FY20 FY21 FY22 FY23 MCM 2: Public Participation Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Comply with State Public Notice Requirement (MGL Ch 30A, Sections 18-25) for all public involvement and Ongoing R R o o o participation Provide an opportunity to participate in SWMP review Annually by June 30 and implementation R R o o o Make Annual reports and SWMP available to the public Ongoing in person and online R R o o o Annual Stormwater Committee Meetings As Needed R R o o o Updated October 2020 Page 2 of 7 Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan FY19 FY20 FY21 FY22 FY23 MCM 3: Illicit Discharge Detection and Elimination Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Adopt bylaw prohibiting illicit discharges and Due on May 1, 2008 as part authorizing investigation, repair, and enforcement of 2003 Permit R Identify all known SSOs that occurred during last five June 30, 2019 and update N/A N/A N/A N/A N/A years annually thereafter Notify EPA / DEP of SSO orally in 24hrs and in writing in Ongoing N/A N/A N/A N/A N/A 5 days Notify responsible party immediately upon Ongoing identification of illicit discharge or illegal connection R R o o o Eliminate known illicits or set expeditious schedule in Ongoing 60 days R R o o o June 30, 2019 and update Outfall/interconnection inventory and ranking annually thereafter R R o o o Written IDDE Program document, including statement of responsibilities and written outfall screening and June 30, 2019 R sampling procedure Written catchment investigation procedure Dec. 30, 2019 R Completed in Annually train IDDE staff Annually by June 30 R PY3 due to o o o COVID-19 Dry weather outfall and interconnection screening June 30, 2021 o N/A - no Investigation of problem catchments must begin, June 30, 2020 problem including wet weather screening o o o catchments Updated October 2020 Page 3 of 7 Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan MCM 3: Illicit Discharge Detection and Elimination FY19 FY20 FY21 FY22 FY23 Deadline (cont.) Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Finish "Phase I" system mapping requirements, including the following elements: - Outfalls and receiving waters - Open channel conveyances - Interconnections with other MS4s and other storm sewer systems - Municipally owned stormwater treatment June 30, 2020 R structures - Waterbodies identified by name and indication of all use impairments as identified in the most recent EPA Approved Massachusetts Integrated List - Initial catchment delineation Update system map with available "Phase II" Annually after Phase I information (see permit for detailed list) mapping is completed o o o FY19 FY20 FY21 FY22 FY23 MCM 4: Construction Site Erosion & Sedimentation Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Bylaw for sediment, erosion, debris, litter and sanitary Due on May 1, 2008 as part waste of 2003 Permit R Written procedure for site plan June 30, 2019 review/inspection/enforcement R FY19 FY20 FY21 FY22 FY23 MCM 5: New Development and Redevelopment Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Due on May 1, 2008 as part Bylaw meeting 2003 post-construction requirements of 2003 Permit R Updated October 2020 Page 4 of 7 Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan MCM 5: New Development and Redevelopment FY19 FY20 FY21 FY22 FY23 Deadline (cont.) Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 MCM 5 Requirement : Update post-construction stormwater bylaw (see permit for detailed list) Proposed Permit Impaired Waters/TMDL Requirement : Include a June 30, 2020 modifications o requirement that new development and extend schedule redevelopment BMPs be optimized for phosphorus removal. Report evaluating street design, parking guidelines and June 30, 2022 and update related rules annually thereafter o o Report evaluating allowing green roofs, infiltration, rain June 30, 2022 harvesting o Identify/rank five or more existing permittee-owned June 30, 2022 and update sites that could be retrofitted with structural BMPs annually thereafter o o FY19 FY20 FY21 FY22 FY23 MCM 6: Good Housekeeping Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Inventory permittee-owned parks/open space, June 30, 2020 and update buildings/facilities and vehicles/equipment annually thereafter R o o o Initial catch basin optimization plan June 30, 2019 R Updated October 2020 Page 5 of 7 Town of Boylston FY2019-2024 Small MS4 Permit 5-Year Workplan FY19 FY20 FY21 FY22 FY23 MCM 6: Good Housekeeping (cont.) Deadline Permit Year 1 Permit Year 2 Permit Year 3 Permit Year 4 Permit Year 5 Written O&M procedures for parks, buildings, facilities, vehicles and equipment, and infrastructure operations and maintenance (i.e., street sweeping, catch basin June 30, 2020 and update cleaning, winter road maintenance and stormwater annually thereafter R o o o treatment structure inspections) including requirements for the proper management of grass cuttings and leaf litter Clean catch basins per plan Annually by June 30 R R o o o Impaired Waters/TMDL Requirement: Sweep streets two times per year, once in the spring and once in the fall.