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l�'�, Jy REQUEST FOR COUNCIL ACTION Department Approval �-. Date: 09/14/09 Item No.: 7.1 City Manager Approval Item Description: Adopt a Resolution Awarding Sid for Rosewood Neighborhood Drainage Improvements BACKGROUND On March 24, 2008, the City Council authorized a study of the storm water hydrology of the Walsh Lake subwatershed located in the neighborhood southeast of Midland Hills Golf Course ("Rosewood Neighborhood") due to neighborhood concerns about localized street flooding and damage to property. This area includes the following streets: Midland Hills Road, Draper Avenue, Rosedale Drive, Westwood Circle, Hythe Street, Skillman Avenue, North Rosewood Lane, and South Rosewood Lane. WSS and Associates, Inc., completed the final design for the first phase of drainage improvements to mitigate the flooding in the neighborhood. This phase consists of the construction of 20 rain gardens throughout the neighborhood. This will decrease the runoff volume of water and change the rate at which water reaches the bottleneck in the storm sewer system at Draper Avenue and Midland Hills Road. Past storms have caused flooding up to 2 feet higher than the lowest floor elevation at 2241 Rosewood Lane South. A backflow preventor will be installed in the existing storm sewer inlet and a berm will be constructed at 2241 Rosewood, which will prevent the street flooding from entering the yard and the home. Staff held several neighborhood meetings with the property owners to provide educational information about rain gardens and seek interested participants for this project. Each rain garden will be constructed in the right of way and/or on properties where the property owners were interested and willing to plant and maintain the rain gardens. A maintenance agreement will be signed by each property owner and recorded against the property. POLICY OBJECTIVE In 2007, the Walsh Lake subwatershed was added as a problem area to the City's Comprehensive Surface Water Management Plan (CSWMP.) One of the goals from the City's CSWMP is to provide flood protection for all residents and structures as well as protect the integrity of conveyance channels and storm water detention areas. This project is also consistent with City water quality goals. Sased on past practice, the City Council has awarded contracts to the lowest responsible bidder. In this case the lowest bidder is TMS Construction, Inc., of Prior Lake, Minnesota. FINANCIAL IMPACTS We received nine bids for the Rosewood Neighborhood Drainage Improvements. Sids were Page 1 of 2