R2002-126 APPROVING CONTRACT AMENDMENT

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�f •o COUNCIL COMMUNICATION FORM Engineering & Infrastructure Memorandum N0. 2002-45 June 26, 2002 TO: Honorable Mayor Howley and City Council FROM: Steve Garman, City Manager Stephen Swanson,P.E., Director of Engineering & Infrastructur� Matthew G Newell, P.E., City Engineer� SUBJECT: Spring Creek Channel Rehabilitation, City Project 2001-47 'i Project Extension , SUMMARY RECOMMENDATION: It is recommended by staff that the City Council approve the attached resolution authorizing an increase in the project funding for Spring Creek Channel Rehabilitation, City Project 2001-47. The resolution enables the City Manager and the Director of Engineering & Infrastructure to increase the contract amount not to exceed$50,000 to complete the project. BACKGROUND: The Spring Creek Channel Rehabilitation project is currently in progress with Willoughby Excavating, Inc. as the contractor. The purpose of the project is to reestablish the existing channel and slopes at critical locations in the creek that have suffered extensive erosion damage. This work is being accomplished by removing sediment or placing fill as necessary and using rip rap for slope protection. Recent inspections of the project limits have indicated the need to increase project quantities in order to assure proper project completion. Quantity increases are necessary for two reasons: (1) certain quantities were underestimated by the Engineering Division on the design review; and, (2) the extraordinary flooding that occurred this spring increased the erosion damage to the creek. The Engineering Division has conducted a thorough inspection of the project site and has determined that the rip rap needed to stabilize the creek bank is nearly double that originally proposed in the contract. Staff is estimating that an additional $20,000 will be required to be added to the proj ect to cover the necessary work. The resolution attached hereto authorizes an expenditure of up to $50,000 in total, to complete the Spring Creek Channel Rehabilitation proj ect.