R2010-232 AUTHORIZING SUPPLEMENT #1 TO AGREEMENT WITH URS CORPORATION

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r . Public Works Memorandum NO. 2010-61 DATE: November 29,2010 TO: Honorable Mayor McElroy and City Council FROM: Ryan P. McCrady, City Manager Richard G. Marley, P.E., Public Works Director SUBJECT: Agreement with URS Corporation for Supplement#1 to the Preliminary Design of the South Shores Bridge over the Sand Creek Arm of Lake Decatur, City Project 2009-OS SUMMARY RECOMMENDATION: It is recommended by staff that the City Council approve the attached Resolution authorizing Supplement#1 to the Agreement with URS Corporation for the preliminary design of the South Shores Bridge over the Sand Creek Arm of Lake Decatur, and the Mayor to sign and the City Clerk to attest. The expenditure far the services provided in Supplement#1 is not to exceed $57,200 which is added to the original cost of$77,500 bringing the total cost of the preliminary design agreement to $134,700. The Sanitary District of Decatur will reimburse the City $16,300 of the preliminary design costs related to raising the District's interceptor. PRIOR COUNCIL ACTION: • August 2,2004—Council approved Resolution R2004-115 authorizing an Agreement with Homer L. Chastain&Associates (Chastain)to inspect five precast concrete deck bridges, including South Shores/ Sand Creek, for a fee not to exceed $7,965. • April 20,2009—Council approved Resolution R2009-50 authorizing an agreement with URS Corporation to complete a preliminary design of the South Shores Bridge over the Sand Creek Arm of Lake Decatur at a cost of$77,500. • September 20, 2010—The City Council, in study session, recommended increasing the bridge clearance by approximately 3 feet to provide better access for Sand Creek Basin boaters. BACKGROUND: The South Shores-Sand Creek Bridge was originally built in 1909. A new superstructure was placed on the old abutments in 1965. The foundation and abutments are 100 years old and the super-structure is 45 years old. Routine inspections carried out by City staff and various consulting engineers since 2004 have determined that the outside beams of this bridge are deteriorating and have moved with respect to the rest of the bridge. In August 2006, the Illinois Department of Transportation (IDOT) directed the City to place a weight restriction on the bridge and to perform yearly follow-up inspections to monitor the outside beams of the bridge; the follow-up inspections Page ( 1