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SECTION V Infiltration/Volume Control The City will require new development to infiltrate storm water runoff in all areas except where it is demonstrated the risk to groundwater quality is significant, the land use is incompatible, or soils are not conducive to infiltration. For projects that use infiltration, the following policies apply: • Pretreatment of storm water to NURP guidelines will be required prior to discharge to an infiltration basin. • The infiltration basin will be sized to infiltrate the runoff from the impervious surface area from a 0.34 inch rainfall event in 72 hours. • Infiltration rates of the soil shall be calculated using the following guidelines based on the soil's hydrologic group: Hydrologic Soil Group Infiltration Rate A 0.50 in/hr B 0.25 in/hr C 0.10 in/hr D 0.03 in/hr Actual infiltration data for the soils on the site obtained from percolation tests conducted by a qualified engineer or soils scientist may be used instead of the rates outlined here, if available. Wetlands Developers Wetlands will be protected within the City boundaries to assure that Developers, the value of wetlands in relation to their surface water quantity Residents benefits are not significantly impacted by development. The City will protect wetlands to assure that their fish and wildlife, City, Developers environmental quality, and socio-economic values are maintained. The City of St. Anthony designates the Rice Creek Watershed Review Agency District as the local governmental unit responsible for wetland management in conformance with the Wetland Conservation Act rules developed by the Board of Water & Soil Resources. 4 The City will utilize wetland inventory information developed by the City U.S. Fish and Wildlife Service and the Minnesota Department of Natural Resources. City of St. Anthony Section V — Page 9 WSB Project No, 1626-25 August 2007 37