CCP 11-08-1999 - Laserfiche WebLink

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I t. I I I I I I I II I I I I I I I and transporting that runoff to the regional ponds. .Due to the relatively flat topography, the size of the storm sewer facilities in Ingerson Road are quite large and consequently more expensive than typical storm sewer facilities for a comparably sized area. If the Council elects not to construct Pond A, the cost of storm sewer along Ingerson Road will be substantially reduced and runoff will be directed into the ditch adjacent to Fernwood Court as it is today. The cost of storm sewer in Cannon A venue (tributary to Pond B) would be minimally affected by a decision not to build Pond B. There are two properties located within the project area which will likely require area drains and connection to the storm sewer in order to provide adequate lot drainage. Final location of area drains and lot grading will be coordinated with the affected property owners during the final design of the project. B. Regional Storm Water Ponds This report has evaluated two possible sites for regional storm water ponds. The general topography of the neighborhood falls steeply from Lexington A venue to approximately Fernwood street then falls very slowly to the west towards an existing wetland located between Ingerson Road and Tiller Lane. Several undrained low areas exist along Ingerson Road which routinely flood into the adjacent residential lawns. The southern portion of the neighborhood drains directly to Lake Josephine through storm sewer and overland flow. The western and northern portion of the neighborhood drains directly to the wetland described above. There are two logical sites for constructing storm water quality ponds which will help trap sediments and pollutants carried by storm water before that runoff reaches Lake Josephine and Lake Johanna. Both ponds included in the report have been preliminarily sized to meet the criteria set by the National Urban Runoff Program (NURP) which results in the removal of 60%-70% of phosphorus and other pollutants found in storm water runoff. The Rice Creek Watershed criteria for pond construction in new developments is consistent with the NURP standards. The construction of both ponds would require coordination with MnDOT and the Rice Creek Watershed. Representatives from the Rice Creek Watershed have indicated that up to $75,000.00 in funding may be available to the City for the construction of the ponds. Both proposed sites are located at the western end of the neighborhood and would treat specific portions of the neighborhood as described below: Proposed Pond A is located between Hamline Avenue and Highway 51 and south of Ingerson Road. This pond would treat storm water from Ingerson Road, Carlton Drive, Femwood Street and Femwood Court which currently drains into Lake Josephine via the ditch/inlet between Femwood Court and Ingerson Court. 5