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Department Approval � Item Description: BACKGROUND g�� � REQUEST FOR COUNCIL ACTION Date: 4/12/10 Item No.: 10.b City Manager Approval "Infrastructure Improvements for the Twin Lakes AUAR Area- Final Report" Update On February 25, 2008, the City Council adopted the "Infrastructure Improvements for the Twin Lakes AUAR Area- Final Report". The purpose of the document was to develop proportionate cost share for individual properties within the Twin Lakes area for the public infrastructure needed to support the redevelopment. The Council approved an update of this report on December 15, 2008. The attached map and table show the 17 roadway infrastructure improvements that were identified as mitigation measures in the AUAR that made up the network of public improvements. In summary, the report developed overall cost estimates for the public infrastructure improvements. We then estimated the traffic generation from each land use proposed as a part of AUAR Scenarios B& C, and routed the PM peak hour trips through the network This established a total number of network trips for the planned build out of the Twin Lakes AUAR area. Using the total cost and total network trips, the report established a cost allocation rate per network trip for each type of use; Residential, Commercial- office and Commercial- retail. The cost per network trip is a function of the total network trips contributed and subsequent cost allocation of specific development types. As development proposals come forward, their respective land uses are reviewed against the assumptions contained in the study in order to determine that the specific cost per network trip value and associated cost allocation amount is appropriate for the proposed use. The City Council has requested that staff review the study on an annual basis in order to ensure that the cost allocation rates assigned to redevelopment are consistent with the real costs to construct the public improvements. In 2009, the first phase of public infrastructure construction was completed. We have determined that the cost allocation rate per network trip will need to be adjusted to ensure that the real costs for these improvements are recovered. The original cost estimates were created using the best information available at that time. They did not include environmental costs including soil engineering, remediation plan development, and clean up costs. They also did not include building demolition costs or actual appraised right-of-way value. Finally, they assumed that the individual projects would be constructed under one construction contract, achieving lower unit pricing. Upon review of actual costs for the construction of the first phase of the public infrastructure construction, we are recommending that we update the cost allocation rates to reflect the real costs for these public improvements. POLICY �BJECTIVE The intent of the Infrastructure Study was to allocate public improvement costs related to Page 1 of 2