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k" REQUEST FOR COUNCIL ACTION Date: 9/26/11 Item No.: 12 a Department Approval City Manager Approval Item Description: "Infrastructure Improvements for the Twin Lakes AUAR Area- Final Report" Update 2 On February 25, 2008, the City Council adopted the "Infrastructure Improvements for the Twin Lakes 3 AUAR Area- Final Report". The purpose of the document was to develop proportionate cost share for 4, individual properties within the Twin Lakes area for the public infrastructure needed to support the 5 redevelopment. The Council approved an update of this report on April 12, 20 10. The attached map 6 and table show the 17 roadway infrastructure improvements that make up the network of public street "7 improvements identified as mitigation measures in the AUAR. 8 In summary, the report developed overall cost estimates for the public infrastructure improvements. 9 We then estimated the traffic generation from each land use proposed as a part of AUAR Scenarios B & 110 C. and routed the PM peak hour trips through the network. This established a total number of network 11 trips for the planned build out of the Twin Lakes AUAR area. Using the total cost and total network 12 trips, the report established a cost allocation rate per network trip for each type of use; Residential, 13 Commercial- office and Commercial- retail. 14, The cost per network trip is a function of the total network trips contributed by a specific development 15 type. As development proposals come forward, their respective land uses are reviewed against the 116 assumptions contained in the study in order to determine that the specific cost per network trip value 1 7 and associated cost allocation amount is appropriate for the proposed use. 11 111",,'11 The City Council has requested that staff review the study on an annual basis in order to ensure that the 119 cost allocation rates assigned to redevelopment are consistent with the real costs to construct the public 20 improvements. In 20 10, the second phase of public infrastructure construction was completed. Upon 2i review of actual costs for the construction of the second phase of the public infrastructure construction, 22 we are recommending that we update the cost allocation rates to reflect the real costs for these public 23 improvements. 24, In light of the 20 10 zoning code update and feedback received from the City Attorney, staff has been 25 taking a close look at the methodology used to develop the original cost allocation distribution. There 26 are two main areas of focus, "2030 background traffic" and establishing a base line for network trips. 27 Over half of the AUAR traffic improvements occur on existing roads. Regardless of Twin Lakes 28 redevelopment, these existing roads will likely have more traffic in the future. This is called 29 "background traffic". A significant portion of the need for the 2030 improvements can be attributed to 30 this background traffic. However, the existing study methodology only allocates cost to background 3 1 traffic for four of the improvements. 32 The parcels in Twin Lakes are redevelopment parcels. This means they already have or have had 33 existing land uses that contributed traffic to the roadway network. To capture this existing network 34, traffic as a part of the proposed ordinance update for the Twin Lakes area, each parcel is assigned a Page I of 2