10/20/2025 Annual Town Meeting - Laserfiche WebLink

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ii. Stormwater treatment facilities shall be designed such that stormwater discharges from the site meet an average annual pollutant removal equivalent to 90% of the average annual load of Total Suspended Solids (TSS) related to the total post- construction impervious area on the site and 60% of the average annual load of Total Phosphorus (TP) related to the total post-construction impervious area on the site calculated by the US Environmental Protection Agency (EPA) Region 1’s Best Management Practice (BMP) Performance Extrapolation Tool (2016) or other BMP performance evaluation tool provided by EPA Region 1 where available and be sized to retain the runoff volume from their catchment area equal or greater than one (1.0) inch multiplied by the total post-construction impervious surface on new development). iii. Runoff shall not be discharged directly to rivers, streams, other surface water bodies, wetlands or vernal pools. Except for overflow from stormwater treatment facilities as described above and when there are no other feasible alternatives, dry wells shall be prohibited. iv. Except when used for roof runoff from nongalvanized roofs and for runoff from minor residential streets, all such wetlands, ponds, swales or other infiltration facilities shall be preceded by oil, grease and sediment traps or forebays or other best management practices to facilitate control of hazardous materials spills and removal of contamination and to avoid sedimentation of treatment and leaching facilities. v. All such artificial recharge systems shall be maintained in full working order by the owner(s) under the provisions of an operations and maintenance plan approved by the permitting authority to assure that systems function as designed. vi. Infiltration systems shall be located so that no part of any leaching system is located less than one hundred (100) feet from drinking water wells. Any infiltration basins or trenches shall be constructed with a three (3’) foot minimum separation between the bottom of the leaching system and maximum groundwater elevation. History: Amended 10-4-1999, ATM, Article 32, approved by Attorney General 1-11-2000 History: Amended 10-16-2006, ATM, Article 24, approved by Attorney General 2-13-2007 (d) incorporate filter media and/or an internal water storage zone to optimize nitrogen and phosphorous removal for projects which employ bio retention or similar filtering best management practices (e.g., rain gardens, tree filters, sand/organic filters, and dry water quality swales) for treatment prior to infiltration, and, History: Added 10-17-2022, ATM, Article 8, approved by Attorney General 12- 23-2022 (e) evaluate and designs new stormwater quantity control BMPs and other drainage system components in accordance with the Resilient Massachusetts Action Team (RMAT) Climate Resilience Design Standards and Guidelines, as may be amended from time to time, to account for projected increases in precipitation intensity and frequency over the duration of the useful life of the systems. History: Added 10-17-2022, ATM, Article 8, approved by Attorney General 12- 23-2022 3) For new subdivision roadways or for lots occupied by uses other than single or two- family homes, including non-residential redevelopment, a stormwater management plan which;