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CCP 11-29-1999
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CCP 11-29-1999
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5/8/2007 1:15:46 PM
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11/13/2006 11:28:06 AM
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<br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br /> <br />Proposed Storm Draina!!:e Improvements <br /> <br />A. Storm Sewer <br /> <br />The proposed improvements include storm sewer construction in all roadways <br />scheduled for reconstruction. Storm sewer improvements include catch basins <br />along curb lines, trunk sewer and outlets into the proposed Regional Ponds <br />described below. Some existing storm sewer is located in Fernwood Court and <br />Fernwood Street however the report has assumed that these facilities will be <br />replaced. The existing storm sewer condition and location will be field surveyed <br />as a part of final design. If the sewer is found to be in a usable location, of good <br />condition and adequate capacity, the plans will provide for the reuse of the <br />existing storm sewer. <br /> <br />The proposed storm sewer improvements are based upon collecting street runoff <br />and transporting that runoff to the two regional ponds and the Fernwood Court <br />channel area. The two regional ponds would drain into the existing ditch system <br />west of Hamline Avenue which drains to Lake Johanna. The Fernwood Court <br />Channel would drain into Lake Josephine. <br /> <br />There are two properties located within the project area which will likely require <br />area drains and connection to the storm sewer in order to provide adequate lot <br />drainage. Final location of area drains and lot grading will be coordinated with <br />the affected property owners during the final design of the project. <br /> <br />B. Regional Storm Water Ponds <br /> <br />This report has evaluated two possible sites for regional storm water ponds. The <br />general topography of the neighborhood falls steeply from Lexington A venue to <br />approximately Fernwood street then falls very slowly to the west towards an <br />existing wetland located between Ingerson Road and Tiller Lane. Several <br />undrained low areas exist along Ingerson Road which routinely flood into the <br />adjacent residential lawns. The southern portion of the neighborhood drains <br />directly to Lake Josephine through storm sewer and overland flow. The western <br />and northern portion of the neighborhood drains directly to the wetland described <br />above. <br /> <br />There are two logical sites for constructing storm water quality ponds which will <br />help trap sediments and pollutants carried by storm water before that runoff <br />reaches Lake Josephine and Lake Johanna. Both ponds included in the report <br />have been preliminarily sized to meet the criteria set by the National Urban <br />Runoff Program (NURP) which results in the removal of 60%-70% of phosphorus <br />and other pollutants typically found in storm water runoff. The Rice Creek <br />Watershed criteria for pond construction in new developments is consistent with <br />the NURP standards. The construction of both ponds would require coordination <br />with MnDOT and the Rice Creek Watershed. Representatives from the Rice <br />Creek Watershed have indicated that up to $100,000.00 in funding may be <br />available to the City for the construction of the ponds. Both proposed sites are <br /> <br />4 <br />
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