R2010-22 ACCEPTING THE BID AND AUTHORIZING CONTRACT

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- ,v Public Works Memorandum NO. 2010-OS DATE: February 5, 2010 TO: Honorable Mayor McElroy and City Co cil FROM: Ryan P. McCrady, City Manager �7� � Richard G. Marley, P.E., Director of Public Works � Keith D. Alexander, Director of Water Management �. SUBJECT: Lake Decatur Dam Repairs, City Project 2009-02 SUMMARY RECOMMENDATION: It is recommended that the City Council approve the attached resolution awarding the contract for Lake Decatur Dam Repairs, City Project 2009-02, to Global Infrastructure, Special Operations Group, LLC., as the lowest, responsible bidder in the amount of$2,847,904.55, and that the Mayor be authorized to execute the contract, and the City Clerk to attest. PRIOR COUNCIL ACTION: Appendix A provides a summary of the prior Council action. BACKGROUND: Summary of the Major Construction History of Lake Decatur Dam Appendix B provides a brief summary of past improvements to the Lake Decatur Dam. Lake Decatur Dam Repairs The Lake Decatur Dam rehabilitation work was initially planned to be a three year, three phase project, however, since no bids were received for the 2009 work, the project was rescheduled to cover two years with an estimated cost of 3.8 million. The current project includes the following work: 1. Repairs to the upstream face of the dam. 2. Rehabilitation of the mechanical systems that raise and lower the sluice gates on the north side of the dam. 3. Replacing the seal systems for the bascule gates and sluice gates. 4. Removal of gate heaters along the bascule gates. 5. Installation of a concrete patch on the downstream spillway of the dam. 6. Replace all eight cylinders on the bascule gates of the dam. The 2011 project will complete the patching work on the downstream face of the dam, inject grout into the dam to reduce water penetration and repair scour damage downstream of the dam. Page � 1