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r <br />» <br />The proposed bituminous mat runoff is to the southeast at a 0.9% grade. This runoff is collected <br />by Swale 3, Catch Basin I, and proposed Pond A. <br />Proposed Pond A outlets to Wetland U 2 through a proposed 18" CMP standpipe weir and culvert. <br />The proposed standpipe replaces the existing which is no longer functioning as designed. The <br />pond will incorporate the replacement wetland on the 12:1 bench area. The pond will also have a <br />depth of 5* which wrill provide for quality as shown on the Water Quality Calculation attachment. <br />Wetland #1 and Wetland #2 flow thru existing outlets, 30" RCP and 15" CMP respectively, to <br />manhole 1 located in the center of the access readjust south of the entrance gate. Manhole 1 has <br />a 30" RCP outlet that drains through an existing 700’ storm sewer system which outfalls into Lake <br />Minnetonka. There is an existing sump catch basin 2 with a 2.25 ’ sump immediately prior to <br />outfalling into Lake Minnetonka. <br />Erosion and Sediment Control <br />Temporary erosion and sediment control would be accomplished through the use of straw bales and <br />silt fence. Silt fence would be installed prior to any construction activity. Straw bales would be <br />placed to protect wetlands and storm sewer inlets. Permanent erosion control would be accomplished <br />by using wood fiber blankets with seeding on those areas of exposed ground including the three <br />proposed swales. The existing catch basin 2 has a 2.25 ’ sump to catch sediments before outletting <br />into Lake Minnetonka. Riprap would be installed at each apron outlet. Exposed soil would be kept <br />to a minimum and restricted to those areas of immediate construction. No unnecessary disturbance of <br />natural soil cover and vegetation would be permitted. <br />Wetlands <br />A Wetland Permit application has been forwarded under a separate submittal to Minnehaha Creek <br />Watershed District and the U.S. Corps of Engineers. Notification has been forwarded to Hennepin <br />Conservation District, Department of Natural Resources, Board of Water and Soil Resources, <br />Metropolitan Mosquito Control District, and the City of Orono. <br />Maintenance <br />Maintenance of the drainage components would occur on an as-necessary basis to include the <br />drainage swales, wetlands, ponds, storm sewer, standpipe with culvert, and sump catch basin. <br />i ff <br />.■•••• .3 :) <br />•li <br />I