R2011-181 APPROVING CONTRACT AMENDMENT

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Public Works Memorandum NO. 2011-77 DATE: November 14, 2011 TO: Honorable Mayor McElroy and City Council Members FROM: Ryan P. McCrady, City Manager Richard G. Marley, P.E., Director of Public Works Keith D. Alexander, Director of Water Management SUBJECT: Resolution Approving Contract Amendment Change Order No. 22, Global Infrastructure, LLC, Lake Decatur Dam Repairs, City Project 2009-02 SUMMARY RECOMMENDATION: It is recommended that the City Council approve the attached resolution authorizing additional funding, in the amount of$50,000, be added to the contract for the Lake Decatur Dam Repairs, City Project 2009-02, for a total project cost of$3,442,023.34. PRIOR COUNCIL ACTION: Appendix A provides a summary of prior Council actions. 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 Repairs project began in June, 2010. The 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. Temporary bulkheads are currently installed on the lake side of the south bascule gate of the dam and will likely be removed early December. All of the hydraulic rams that operate the bascule gates have been installed and tested. Concrete repairs have been made to various parts of the dam, including major repair work in the sluice gate area. A majority of the work has shifted to the north side of the dam centering on the sluice gates. Page I 1