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Page 18 <br /> <br /> <br />construction/grading activities will be subject to NPDES Construction Stormwater General Permit <br />regulations (25). <br /> <br />The SWPPP is currently being developed. Temporary erosion and sediment control best <br />management practices (BMPs) will initially be installed, maintained/repaired, and amended <br />throughout the construction phases as required to remain compliant with the forthcoming <br />NPDES Construction Stormwater Permit. BMPs may include silt fences, inlet protection, bio- <br />logs, rock construction entrances, erosional control blanketing, phased grading, sedimentation <br />basins, and/or dust control. <br /> <br />Post-Construction Site Runoff <br />The project would increase the amount of impervious surface and the volume of stormwater <br />within the project area. Based on the current concept plan, the roads, residential, commercial <br />parcel, parking lots, and trails will account for an estimated ± 63.64 acres of impervious surface. <br />Post-development stormwater runoff will be typical of a suburban development. <br /> <br />The City’s Comprehensive Plan states that the City “is responsible for its stormwater management <br />system. Through the City’s Stormwater Management Plan, Elk River maintains a system of catch <br />basins, pipes, ditches, and detention ponds. There is no Watershed District or Water Management <br />Organization with jurisdiction in the City. This means the City is regulated as a Municipal <br />Separate Storm Sewer System (MS4) community, responsible for compliance with National <br />Pollution Discharge Elimination System (NPDES) permitting requirements, including its <br />Stormwater Ordinance and the Stormwater Pollution Prevention Plan (SWPPP). <br /> <br />The Elk River Stormwater Program Guide states, “runoff of water from residential property shall <br />be minimized to the maximum extent practicable” (25). The guide also “sets forth the minimum <br />requirements for stormwater management to diminish threats to public health, safety, public, and <br />private property and natural resources for the community” (25): <br /> Protect life and property from dangers associated with flooding. <br /> Protect public and private property from damage resulting from runoff or erosion. <br /> Ensure site design minimizes the generation of stormwater and maximizes pervious <br />areas for stormwater treatment. <br /> Promote regional stormwater management by watershed. <br /> Protect, maintain, and/or restore water quality from nutrients, pathogens, toxics, and <br />debris. <br /> Promote infiltration and groundwater recharge. <br /> Promote water quality treatment for new development, redevelopment, and linear <br />construction projects. <br /> <br />Per the City code, “new and redevelopment projects that disturb more than 5,000 square feet of <br />land area shall be designed to incorporate erosion control and stormwater management features <br />and to meet the minimum requirements outlined in the most recent version of the NPDES <br />construction stormwater general permit” and “whenever possible, new development projects shall <br />be designed using the better site design techniques of the current version of the Minnesota <br />Stormwater Manual. Better site design involves techniques applied early in the design process to <br />preserve natural areas, reduce impervious cover, distribute runoff and use pervious areas to more