08/10/2020 BOARD OF SELECTMEN Agenda Packet

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*DRAFT#2 OCTOBER 19, 2020 ANNUAL TOWN MEETING* Article 15 To see if the Town will vote to amend Section 174-27.2 Stormwater Management as follows: A. For any new residential or non-residential development or redevelopment requiring either subdivision approval, a Special Permit, plan review underthe provisions of§174-24.B., or a Building Permit for a building over one thousand (1000') square feet in area a system of stormwater management and artificial recharge of precipitation shall be required which is designed to achieve the following purposes: prevent untreated discharges to wetlands and surface waters, preserve hydrologic conditions that closely resemble pre-develop ment conditions, reduce or prevent flooding by managing the peak discharges and volumes of runoff, minimize erosion and sedimentation, not result in significant degradation of groundwater, reduce suspended solids, nitrogen, phosphorous, volatile organics and other pollutants to improve water quality, and provide increased protection of sensitive natural resources,and encourage stormwater Low Impact Development (LID) planning and development strategies to the extent feasible. B. These standards may be met using the following or similar best management practices.- 1. For compliance with the Performance Standards of this By-Law, the design of treatment and infiltration practices must meet the current Massachusetts Department of Environmental Protection"s Stormwater Management Standards and document compliance based on the Stormwater Handbook as amended,, or other federally or State approved BMP design guidance. Projects must also comply with the Post-Construction Stormwater Management Requirements of the current Small MS4 General Permit, whichever is more stringent, using appropriate Stormwater Best Management Practices 2. For new sinigIe or two-family residences, recharge shall be attained through site design that incorporates natural drainage patterns and vegetation in order to maintain pre-development stormwater patterns and water quality to the greatest extent possible. Stormwater runoff from rooftops, driveways and other impervious surfaces shall be routed through vegetated water quality swales, as sheet flow over lawn areas or to constructed stormwater wetlands, sand filters/ organic filters and/or similar systems capable of removing nitrogen and phosphorous from stormwater. 3. For new subdivision roadways or for lots occupied or proposed to be occupied by uses other than single or two-family homes, a stormwater management plan which; It (a) utilizes site planning and building techniques Including LID planning and development strategiesl such as minimizing impervious surfaces and disturbance of existing natural areas, pervious reserve or overflow parking areas, multi-level buildings, parking structures, "green roofs"and storage and re-use of roof runoff,to minimize runoff volumes and the level treatment required to reduce contaminants, (b) minimizes erosion and runoff from disturbed areas during construction and (c) provides for the following: 8