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Item No: 7B Meeting Date: December 22, 2008 Type of Business: CB Administrator Review: _____ City of Mounds View Staff Report To:Honorable Mayor and City Council From:Joe Rhein, Consulting Engineer Item Title/Subject:Resolution 7381 Approving The Findings Of The Ardan Avenue Drainage Subdistrict Analysis Background: On March 24, 2008 the City Council adopted Resolution 7243 ordering the 2009-2010 Street and Utility Improvement Project. In 1989 a Report had been performed on the Ardan Avenue Drainage Subdistrict (1989 Drainage Report), which identified proposed trunk storm sewer improvements that would impact the project area of the 2009-2010 Street and Utility Improvement Project. On November 24, 2008 the City Council adopted Resolution 7361 authorizing a new analysis to be performed of the Ardan Avenue Drainage Subdistrict (2008 Drainage Report). The purpose of the new 2008 Drainage Report would be to identify alternatives to the improvements proposed in the 1989 Drainage Report. Discussion: As noted in the Staff Report for November 24th, the 1989 Drainage Report proposed a new east-west trunk storm sewer along Ardan Avenue, a new storm sewer along Sherwood Road, and a new regional storm water pond, called the “East Detention Pond”, located north of the intersection of Sherwood Road and Greenwood Drive. A figure from the 1989 Report showing these facilities is included with this Staff Report for reference. Concerns over the proposed improvements in the 1989 Drainage Report included high cost, physical challenges, the need to acquire land for the pond, and the concept of constructing a regional pond. In general, the goals of the new 2008 Drainage Report were to determine whether the improvements from the 1989 Drainage Report were necessary, or if an alternative could be identified that would eliminate the regional pond and trunk storm sewer on Sherwood Road, while still increasing the efficiency of the storm sewer system.