CCP 10-10-2000 - Laserfiche WebLink

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I I I I I I I . I I I I I I I , I 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. Water Oualitv Improvements A significant amount of discussion regarding the scope of water quality improvements has occurred as a part of the Task Force meetings. This report proposes improvements to the Femwood Channel located just west of Femwood Court and south of Ingerson Road and the existing drainage channels and wetland located between Hamline Avenue and Trunk Highway 51. 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 soulhern portion of the neighborhood drains directly to Lake Josephine through storm sewer and overland flow. The weSlern and northern portion of the neighborhood drains directly to the wetland described above. There are two logical sites for constructing storm water quality improvements which will help trap sediments and pollutants carried by storm water before that runoff reaches Lake Josephine and Lake Johanna. The proposed improvements do not meet the criteria set by the National Urban Runoff Program (NURP) which results in the removal of 60%-70% of phosphorus and other pollulants found in storm waler runoff however, they are anticipated to provide some enhancement to the water quality of discharges entering the natural water bodies in the City. The Rice Creek Watershed criteria for pond construction in new developments is consistent with the NURP standards however the watershed officials are generally open to exceptions from the NURP standards when dealing with established neighborhoods and limited open space to provide for ponding improvements. The construction of the project including the water quality improvements will 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 water quality improvements. The scope of the proposed waler quality improvements are described below: . Fernwood Channel Improvements: The Femwood Channel is located jUSl west of Femwood Court and is utilized for neighborhood runoff from Ingerson Road east of Dunlap Street, Carlton A venue and Femwood Street and Femwood Court. The Lake Josephine Homeowners associalion owns the downstream portion of the channel (approximately 400 feet) adjacent to Lake Josephine. The remainder of the channel (approximately 175 feet) is publicly owned. The proposed improvements are limited to Ihe publicly owned portion of the channel and would consist of a control weir and excavation of a stilling basin to help settle out large particles from the flow stream. The stilling basin would require periodic removal of silts by City staff to remain effective. 6