07/29/2009 Env Bd Packet - Laserfiche WebLink

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• • design criteria): (a) Areas of C or D hydrologic soil groups that cannot be routed by a gravity system to onsite A or B hydrologic soil groups; (b) Areas with a groundwater table within three (3) feet of surface, or otherwise at an elevation that poses a threat of groundwater contamination or renders the infiltration BMP ineffective; (c) Areas where soil contamination is present or land use history indicates a likely threat of soil contamination. (a) Areas of C or D hydrologic soil groups that cannot be routed by a gravity system to onsite A or B hydrologic soil groups; (b) Areas with a groundwater table within three (3) feet of surface, or otherwise at an elevation that poses a threat of groundwater contamination or renders the infiltration BMP ineffective; (c) Areas where soil contamination is present or land use history indicates a likely threat of soil contamination. 9(b)(ii) Upland Restoration /Conservation - Conservation of high quality upland areas with a Natural Heritage ranking of "C" or better or restoration of Native Prairie, Woodlands or Forests. (a) Volume credit will be given only for area protected in perpetuity by recorded covenants in favor of the District. (b) Volume credit will be given only for area contiguous with a Wetland Preservation Corridor OR area of at least 0.5 acres not contiguous with the Wetland Preservation Corridor. 8(e) The property owner must record a declaration, or a public owner execute a maintenance agreement, that prohibits plowed snow storage in a location from which runoff will be conveyed without adequate pretreatment (minimum of 25 feet of overland drainage on grassland or other rough vegetated surface to trap flow) or sheet flow directly into a wetland within the RMP area. This requirement does not apply to snow removed from public roadways. 7(c) All buffer required under section 7 must average at least 50 feet in width, measure at least 25 feet at all points, and meet the average width at all points of concentrated inflow. Buffer receiving secondary replacement credit as upland habitat area must be at least two acres in size. • 8(e) The property owner must record a declaration, or a public owner