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REQUEST FOR COUNCII, ACTION Department Approval: � �� DATE: 10/22/0 1 ITEM NO.: F-2 Agenda Section: Reports/Recommendations Item Description: Approve plans and specifications and order advertisement for bids for Zimmerman Lake Drainage Improvement Project Background: On July 18, 2001, the City Council approved a feasibility report for the Zimmerman Lake Drainage Improvements, and ordered preparation of Plans and Specifications. The proposed drainage improvement would address two regional flooding problems. During intense rain events, water accumulates in the south ditch of Highway 36 just north of the CFL/ Wellington Management building and backs up to the south and into the building. Since the water is not able to flow through to Zimmerman Lake, it causes problems in the upstream pipe. At the intersection of Eldridge Avenue and Pascal Street, the water surcharges out of the e�sting pipe and floods the street as well as portions of the Har Mar Mall parking lot. The proposed drainage improvement would increase the culvert capacity under Highway 36 by jacking an additional 84-inch pipe to convey water into Zimmerman Lake. This improvement would address both of these regional flooding problems. There would be no detrimental downstream impacts. The drainage study completed by H.R. Green identified a solution with an estimated cost of $600,000. We contracted with another engineering consultant, WSB and Associates, to develop the plans and specifications for this project. They have refined the proposed solution and reduced the cost to $493,200; this estimate includes administration, engineering, and other contingencies. We have identified this flooding as a regional problem. The reasons for the flooding cannot be attributed to any one single cause. The runoff that is ponding in the ditch is from 493 acres of land made up of residential, commercial and highway uses. There is no public drainage easement on the CFL building parcel to a11ow for the impoundment of water on their property. The pipe was installed under Hwy 36 in the late 1950's, there has been some development and redevelopment in the subwatershed over the last 50 years that contributes to the overall quantity of water being conveyed to Zimmerman Lake. Due to the nature of this project it is best to construct it during the winter, the ground is frozen and the contractor does not have to worry about delays from unexpected rainstorms. In order to get this proj ect completed by spring thaw, it is critical that we put out ads for bid and award this proj ect before the first of next year. In the feasibility report, we presented a cost share that included Falcon Heights, the University of Minnesota, Wellington Management/CFL, Mn/DOT and the City of Roseville. Falcon Heights has declined participation in the solution. We are still working with the University on their cost participation. Staff recommends that due to timing we should move forward with a revised cost participation schedule.