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• * ■ DATE: E. 1 f 15! 03 ITEM EM NLJ.. Department Approval: Manager i ■ Agenda ■:: o Consent Item Description* Approve Change Order for Arona Pond Improvement Project; Phase I Background: The Arona Pond Improvement Project will increase the pond capacity, through the installation of a lift station, restoration of infiltration component of the basin, and expanding the size of ` the pond. This project consists of two parts. The first phase is the excavation of the existing pond and installation of new outlet p i P es. The second phase will be the construction of the lift station. Bids were solicited for Phase I during the month of September and awarded to Zappa and Sons construction on September 29,2003. The project has been underway for the last month. Tree removal has been completed and the contractor has been working on excavation. This proposed change order is for the extension of 5 pipe outlets into the pond that were under water when the initial survey was completed for this project. Three of these outfalls drain city storm sewers acid were an oversight that should have been included in the original bid. Two of the outfalls drain storm water from the JLT site, and were not discovered until the contractor drained the pond for excavation. Upon dewaterin Fo g the pond, we were able to survey and complete a redesign to lower and extend these existing outfalls. The new outlets will convey the storm water under the proposed trail into the new pond. The Change order increases the contract by 35,001,00. This is an 8% increase to the overall contract price of $433,245.10. Policy Implications: The proposed Change order- requires Council approval. The work is critical to drainage in the residential and commercial neighborhoods surrounding the pored. If these outfalls are not extended, it will impact the way the pond and trail functions in the future. Financial implications: The total proposed project cost for this improvement was originally estimated at 700,000. This includes both Phase I and Phase U. The total cost of the project would be split according to p g the contributing runoff volume. The contributing volume is split 13% DEVELOPER/ 7% CITY. Revised estimates place the total prof ect cost closer to 600,000; $78,000 Developer cost/ $522,000 City storm water utility funds. The storm water utility fund will be reimbursed for this project through future development contributions within this watershed and future captured tax increment funds. once Phase II bids have been opened we will be able to provide a final cost participation summary. The change order cost will be added to the overall contract and financed as described above. LOW Motion approving Change order No. I for M-03-06 rona Pond Improvement Project, Phase .I in the amount of $35,001. Prepared by: Debra Bloom