10/20/2025 Annual Town Meeting - Laserfiche WebLink

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construction impervious area on the site and 50% of the average annual load of Total Phosphorus (TP) related to the total post-construction impervious area on the site calculated by EPA Region 1’s BMP Performance Extrapolation Tool (2016) or other BMP performance evaluation tool provided by EPA Region 1 where available and be sized to retain rainfall from their catchment area equivalent or greater than 0.8 inch multiplied by the total post-construction impervious surface on the redeveloped site. vi. Stormwater management systems on redevelopment sites may utilize offsite mitigation within the same United States Geological Survey (USGS) HUC12 watershed as the redevelopment site to meet the equivalent retention or pollutant removal requirements of the Massachusetts small MS4 General Permit (MS4GP) part 2.3.6.a.ii.4(a). vii. Roadway widening or improvements that increase the amount of impervious area on the redevelopment site by greater than or equal to a single lane width shall meet the requirements of MS4GP part 2.3.6.a.ii.4(a). viii. Redevelopment activities that are exclusively limited to maintenance and improvement of existing roadways, (including widening less than a single lane, adding shoulders, correcting substandard intersections, improving existing drainage systems, and repaving projects) shall improve existing conditions unless infeasible and are exempt from MS4GP part 2.3.6.a.ii.4. ix. 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) filter media and/or an internal water storage zone to optimize nitrogen and phosphorous removal shall be incorporated into the design for treatment prior to infiltration. x. Design of new stormwater quantity control BMPs and other drainage system components shall be designed in accordance with Resilient Massachusetts Action Team (RMAT) Climate Resilience Design Standards and Guidelines, as amended, to account for projected increases in precipitation intensity and frequency over the duration of the useful life of the systems. C. The Building Inspector shall require the submission of sufficient plans and specifications to demonstrate the location and nature of proposed stormwater facilities for development under subsection B (1) and shall require their implementation. For development and redevelopment under subsection B (2), the permitting authority shall require the submission of sufficient plans and specifications to demonstrate the location, nature, operation and effectiveness of the proposed stormwater management facilities and practices and shall require their implementation and maintenance, including provisions for deed restrictions and other implementing provisions, as a condition of approval of the proposed development. No permit may be approved for a development unless the permitting authority determines in writing that the proposed system of stormwater management and artificial recharge will achieve the purposes described in Subsection A. History: Amended 5-3-1999, ATM, Article 45, approved by Attorney General 7-29-1999 History: Amended 10-4-1999, ATM, Article 32, approved by Attorney General 1-11-2000 History: Amended 10-19-2020, ATM, Article 14, approved by Attorney General 2-11-2021 Or take any other action relating thereto. Submitted by the Planning Department