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reduce or prevent flooding by managing the peak nized roofs all such wetlands ponds, discharges and volumes of runoff, minimize ero- swales or other infiltration facilities shall sion and sedimentation, not result in significant be preceded by oil, grease and sediment degradation of groundwater, reduce suspended traps or other best management practices to solids, nitrogen, volatile organics and other pol- facilitate control of hazardous materials lutants to improve water quality and provide spills and removal of contamination and to increased protection of sensitive natural avoid sedimentation of treatment and resources. leaching facilities. All such artificial B. These standards may be met using the following recharge systems shall be maintained in full or similar best management practices: working order by the owner(s) under the provisions of an operations and mainte- 1) For lots occupied, or proposed to be occu- nance plan approved by the permitting pied, by single or two-family residences, authority to assure that systems function as recharge shall be attained through site designed. Infiltration systems greater than design that incorporates natural drainage three (3) feet deep shall be located at least patterns and vegetation in order to maintain one hundred(100)feet from drinking water pre-development stormwater patterns and wells. Any infiltration basins or trenches water quality to the greatest extent possible. shall be constructed with a three (3) foot Stormwater runoff from rooftops, drive- minimum separation between the bottom of ways and other impervious surfaces shall the structure and maximum groundwater be routed through vegetated water quality elevation. swales, as sheet flow over lawn areas or to constructed stormwater wetlands, sand fil- C. The permitting authority shall require the sub- ters, organic filters and/or similar systems mission of sufficient plans and specifications to capable of removing nitrogen from demonstrate the operation and effectiveness of stormwater. the proposed stormwater management facilities and practices and shall require their implementa- 2) For lots occupied or proposed to be occu- tion and maintenance, including provisions for ; pied by other uses, a stormwater manage- deed restrictions and other implementing provi- ment plan which 1) utilizes site planning sions, as a condition of approval of the proposed techniques to minimize runoff, 2) utilizes development. No permit may be approved for a nonstructural techniques, including pollu- development unless the permitting authority tion prevention and source reduction, to determines in writing that the proposed system of minimize the type of treatment needed for stormwater management and artificial recharge stormwater and 3)provides for the artificial will achieve the purposes described in subsection recharge of precipitation to groundwater A." through site design that incorporates nat- ural drainage patterns and vegetation and or take any other action related thereto. through the use of constructed(stormwater) Submitted by Petition wetlands, wet (retention) ponds, water quality swales, sand filters, organic filters Planning Board voted at a Public Hearing held on or similar site-appropriate best manage- April 28, 1999 3-0 for approval. ment practices capable of removing nitro- Motion made by Edward Baker: I move that Article gen and other contaminants from stormwa- 45 be voted as printed in the warrant, with the excep- ter and meeting the Stormwater tion of the phrase or take any other action relating Management Standards and technical guid- thereto. ance contained in the Massachusetts Department of Environmental Protection's Motion passes unanimously at 9:04 p.m. Stormwater Management Handbook, Town Meeting adjourns at 9:04 p.m. Volumes 1 and 2,dated March 1997,for the type of use proposed and the soil types pre- sent on the site. Such runoff shall not be discharged directly to rivers, streams, other surface water bodies, wetlands or vernal Pools.Dry wells shall be prohibited.Except when used for roof runoff from non-galva- 67