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Rls�kspvlffi� REQUEST FOR COUNCIL ACTION Date: 12/15/08 Item No.: 12.c Department Approval City Manager Approval Item Description: Amendment to the "Infrastructure Improvements for the Twin Lakes AUAR Area- Final Report" BACKGROUND 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 attached map and table show the 10 roadway infrastructure improvements that were identified as mitigation measures in the AUAR that made up the network. In summary, the report developed overall cost estimates for the 10 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 have been 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. When the study was completed, we analyzed all of the public street improvements anticipated by the AUAR mitigation plan. Since the study was adopted by the City Council, we have had two developers request to construct a street segment that was not included in the study. This segment is Iona Lane, from Cleveland Avenue to Mt. Ridge Road. Upon review of the proposed new public street, it was determined that the street would not only serve the proposed Park and Ride, it would also provide access for the redevelopment of PIK Terminal and the remaining portions of the former old Dominion Freight Lines site. As a result staff felt that it was appropriate to amend the "Infrastructure Improvements for the Twin Lakes AUAR Area- Final Report" to include this public improvement so that the costs to construct the street would be shared by the redevelopment area. As shown on the revised Figure 21, the inclusion of the cost to construct Iona Lane in the Report increased the overall improvement cost by $420,075 to $23,352,039. As a result we broke down the blocks even further to accurately assign the network trips for the uses of the individual blocks. For example, the uses on Block 1 a would not use Iona Lane because of its location; however, the uses on Block lb & Block 2 would use Iona since it is east of Mt. Ridge Road. The uses within Block 3 would Page 1 of 2