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4 <br /> <br />Infiltration was deemed infeasible on the site due to high clay content of the soils ranging <br />from 15-20 feet deep. <br /> <br />The peak runoff rates from the impervious areas under proposed conditions will be lower <br />than under existing conditions for the 2-, 10-, and 100- year storm events as required by <br />Rice Creek Watershed District rules. <br /> <br /> <br />Stormwater Pollution Prevention <br /> <br />The Sediment and Erosion Control Plan details locations for installation of BMPs <br />including a rock construction exit (with geotextile fabric beneath the rock), rip rap for <br />energy dissipation at two curb cuts abutting the stormwater basin, biologs for ditch <br />checks in the swale, and silt fence for perimeter control. A concrete washout area is also <br />noted on the plans. <br /> <br />There is an existing soil berm that runs along the south and east perimeters of the <br />proposed pavement area. This berm will serve as sediment control for those perimeters. <br /> <br />Notes indicating that erosion blanket used must be a natural net variety must be added to <br />the plan set. Specific sheets to include this note are in the recommendations. <br /> <br />Because this site drains to an impaired water, Clearwater Creek, the stabilization timeline <br />is 7 calendar days from construction ceasing. <br /> <br />Construction SWPPP Manager contact information and training details must be added to <br />the SWPPP prior to construction activity on the site. <br /> <br />Flood Plain <br /> <br />Site does not fall within the flood management zone. <br /> <br />Shoreland District <br /> <br />Site does not fall within the Shoreland District. <br /> <br />Wetlands <br /> <br />A 0.81 acre area of wetland was delineated within the parcel boundaries. This shallow <br />marsh and seasonally flooded fringe are located on the southeast corner of the parcel. <br /> <br />Two additional wetlands just south of the proposed outdoor storage area were deemed <br />incidental by Rice Creek Watershed District in 2007. Impacts to these wetlands will not <br />require mitigation. <br /> <br />No additional wetland impacts that would require mitigation are proposed for this project.