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MINNEHAHA CREEK <br />WATERSHED DISTRICT <br />QUALITY OF WATERS QUALITY OF LIFE <br />Rate control is achieved by demonstrating there is no increase in the 1, 10, & 100 year storm event. <br />Since the final size and location of the homes is unknown, a concept stormwater management plan <br />should be submitted based on anticipated home sizes and locations. That concept should be based on <br />an estimated hardcover calculation including homes, driveways, and accessory structures. Individual <br />permits will be required for the homes. If the final designs for the homes have more hardcover than the <br />concept stormwater plan, modifications to the proposed stormwater facilities may be required. <br />Wetland Protection: <br />The buffer provision of the MCWD Wetland Protection rule is triggered whenever the Stormwater <br />Management rule is triggered. Wetland buffers must be provided on that part of the wetland edge that <br />is down gradient from the activity or construction. Wetland buffer widths are determined by the <br />management class of the wetlands as shown in the table below: <br />Management Class <br />Base Buffer Width <br />Minimum Applied Buffer Width <br />Manage 3 <br />20 feet <br />16 feet <br />Manage 2 <br />30 feet <br />24 feet <br />Manage 1 <br />40 feet <br />34 feet <br />Preserve <br />75 feet <br />67 feet <br />The Applied Buffer Width, the actual width of wetland buffer(s) required for a permitted project, shall <br />be the Base Buffer Width as reduced by beneficial slope or soil conditions pursuant to the following <br />formulas: <br />For every 5 percent decrease in average buffer slope from 20 percent, the Base Buffer Width <br />may be reduced 2 feet. <br />2. For every grade of Hydrologic Soil Group above Type D for the predominant buffer soil <br />condition, the Base Buffer Width may be reduced 2 feet. <br />Reductions for beneficial slope or soil conditions shall not reduce the buffer width to less than the <br />applicable Minimum Applied Buffer Width. <br />Buffer width may vary based on demonstrated site constraints, provided that a width of at least 50 <br />percent of the Applied Buffer Width is maintained at all points, there is no reduction in total buffer area, <br />and the buffer provides wetland and habitat protection at least equivalent to a buffer of uniform <br />Applied Buffer Width. Buffer width averaging calculation will exclude any part of the buffer exceeding <br />200 percent of the Applied Buffer Width. <br />The large wetland adjacent to Orono Orchard Road and the wetland on the northwestern corner of the <br />property are classified as Preserve by the District's Functional Assessment of Wetlands, corresponding <br />to a 75 foot base buffer width. The pond on the property was not included in the FAW. A brief review of <br />the wetland from aerial photos and the submitted delineation report suggests that it is a Manage 1 <br />wetland, or lower. A 40 foot buffer may be applied to that wetland, or a MnRAM could be conducted to <br />determine the appropriate management class for the pond. <br />We collaborate with public and private partners to protect and improve land and water for current and future generations. <br />........................................................................................................................................................................................ <br />15320 Minnetonka Boulevard, Minnetonka, MN 55345 • (952) 471-0590 • Fax: (952) 471-0682 • www.minnehahacreek.org <br />