R2005-189 APPROVING AGREEMENT AMENDMENT

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COUNCIL COMMUNICATION FORM Engineering & Infrastructure Memorandum NO. 2005-81 , December 13, 2005 TO: Honorable Mayor Osborne and City Council FROM: Steve Gar , City Manager Stephen Sw on, P. E., IIirector of Engineering & Infrastructure� Matthew C. ewell, P. E., City Engineer � Douglas R. Nood'en, P. E.,Assistant City Engineer��` .0 SUBJECT: Amendment to Agreement with Blank,Wesselink, Cook& Associates, Garfield Avenue Bridge Rehabilitation, City Project 04-27 SUMMARY RECOMMENDATION: It is recommended by staff that the City Council approve the attached resolution approving an increase to the contract amount with Blank, Wesselink, Cook & Associates, (BWC), for the Garfield Avenue Bridge Rehabilitation, City Project 04-27. The resolution authorizes the City Manager and the Director of Engineering & Infrastructure to increase the existing $35,200 contract amount by $7,500 to a maximum $42,700 in order to provide structural analysis and design of the proposed temporary support system for Garfield Overpass. Reference the attached BWC letter dated December 6, 2005. BACKGROUND: On September 6, 2005 the City Council awarded a contract to BWC for the Garfield Avenue Bridge Rehabilitation to provide professional engineering services for the rehabilitation of failing sections of various structural components of the bridge. Due to the unusual original design and construction of the pier cap and bearing system of the Garfield Overpass, it was found that during the proposed rehabilitation, substantial temporary su ort structures will be re uired to be constructed in order to su ort the live loads while the PP q PP existing structural members are repaired and the pier caps and columns are removed and/or replaced. These temporary supports would then be removed when construction is completed. The cost of constructing these supports and their removal represents a significant cost to the City. As a cost savings option, BWC has proposed an alternative non-conventional design that would incorporate making the temporary supports permanent. It is recommended that the City Council authorize an amendment to the agreement with BWC to perform the additional engineering and review of the new support structures.