R2009-244 REJECTING THE BIDS - Laserfiche WebLink

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Public Works Memorandum NO. 2009-109 DATE: December 1, 2009 TO: Honorable Mayor McElroy and City Co ncil FROM: Ryan P. McCrady, City Manager � Richard G. Marley, P.E., Director of Public Works �..,��- �`°' Keith D. Alexander Director f W t r M �� , o a e anagement �-� � SUBJECT: Lake Decatur Dam Bascule Gate Hydraulic Cylinder Procurement, City Project 09-02M SUMMARY RECOMMENDATION: It is recommended by staffthat the City Council reject all bids for the Lake Decatur Dam Bascule Gate Hydraulic Cylinder Procurement, City Project 09-02M. BACKGROUND: Prior Council Action Appendix A provides a summary of the prior Council action. Summary of the Major Construction History of Lake Decatur Dam Appendix B provides a brief summary of past improvements to the Lake Decatur Dam. Bascule Gates The current lake Decatur Dam was originally constructed in 1922. Later, in 1955 bascule gates were added to raise the level of the lake and impound more water. The bascule gates are raised and lowered using eight very large hydraulic cylinders. The cylinders have pistons just over 2 feet in diameter and a stroke length of 4 feet. The cylinders are approximately 10 feet tall when fully closed. Due to their location attached to the down stream face of the bascule gates, these cylinders are subjected to a very harsh environment. The cylinders have been refurbished once with four being done in 1998 and the remaining four being refurbished in 2000. Subsequent use of the cylinders on the north bascule gate has caused at least 2 cylinder seals to fail. Additionally, the cylinder rods have become scored. Due to the condition and age of the cylinders combined with the fact that they have been previously refurbished caused the consulting engineers to conclude that the cylinders should be replaced. Since there is usually a long lead time to fabricate special hydraulic cylinders, the decision was made to seek bids from cylinder suppliers before the construction contract was let in order to assure delivery in time for installation as part of the 2010 dam rehabilitation project. 2010 Dam Rehabilitation Project As Council is aware, the 2009 Lake Decatur Dam Rehabilitation project received no bids and was delayed to 2010. It is proposed that the cylinder replacement be completed as part of this work. The 2010 work will include the following: Page � 1