R2009-195 AUTHORIZING THIRD AMENDMENT TO AGREEMENT WITH HANSON PROFESSIONAL SERVICES, INC.

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Public Works Memorandum NO. 2009 -98 DATE: September 28, 2009 TO: Honorable Mayor McElroy and City uncil Members � FROM: Ryan P. McCrady, City Manager � Richard G. Marley, P.E., Director of Public Works SUBJECT: Third Amendment to Engineering Agreement with Hanson Professional Services for the Lake Decatur Dam Repairs Project, City Project 09-02 SUMMARY RECOMMENDATION: Staffrecommends that the City Council approve the attached resolution authorizing the Third Amendment to the Agreement with Hanson Professional Services, Inc., (Hanson), for engineering services to develop designs and construction documents for repairs to the Lake Decatur Dam for a fee not to exceed $57,200. The third Amendment to the Agreement authorizes an increase in the fee of$57,200, therefore increasing the not to exceed fee of$239,382 to $296,582. 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. Project Status The 2009 Dam Repair Project initially went out for bid in May, 2009. The bid opening was held on June 25, 2009, however no bids were received. The project will be advertised again in January, 2010, which will enable more contractors to bid the project before their work has been obligated for the year. Project Change � The dam rehabilitation project was originally planned to span 3 years. With the inability to obtain bids earlier this year, staff recommends performing the work in 2 years by accelerating the purchase and replacement of the large hydraulic cylinders that raise and lower the long bascule gates along the crest of the dam. It is proposed that replacement cylinders be purchased under separate bids within the next two to three months and installed during the 2010 construction project. The recommendation is to obtain all eight cylinders in the hope of obtaining a better price. Purchasing them ahead of the general construction project will increase the likelihood of delivery within the 2010 construction season. Page � 1