TO: Board of Supervisors
FROM: Steven Lederer - Director of Public Works
REPORT BY: James Reese - Associate Engineer
SUBJECT: Amendment to Professional Services Agreement No.190001B for Biggs Cardosa Associates, Inc. for the Garnett Creek Bridge Replacement Br No. 21C0042, RDS 16-16.
RECOMMENDATION
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Approve and authorize Amendment No. 1 to Agreement No. 190001B with Biggs Cardosa Associates, Inc. to increase the maximum compensation by $75,032, for a new maximum of $1,108,317, to provide technical and construction support services for the Garnett Creek Bridge Br. No. 21C0042 Bridge Replacement Project, RDS 16-16. (Fiscal Impact: $75,032 Expense; Roads Capital Improvement Projects Fund; Budgeted; Discretionary).
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BACKGROUND
Garnett Creek Bridge (Br. No. 21C0042) was damaged in the August 24, 2014, Napa earthquake and the bridge is currently closed. The bridge is a stone masonry arch bridge on Greenwood Avenue approximately 0.2 miles northeast of Myrtledale Road. The bridge was constructed in 1904 and it is listed in the National Register of Historic Places. Garnett Creek Bridge is designated as an Off-System bridge and the Project is eligible for 100% Federal funding with Toll Credits paying the local match funds. The total estimated project cost including design, environmental clearance, right-of-way, construction engineering and construction is approximately $10.2 million.
The California Department of Transportation (Caltrans) approved Preliminary Engineering (PE) funds (E76 for PE) for the amount of $1,142,282. Caltrans does not allow the County to invoice for the "fully burdened" staff billing rate and other "non-participating" expenses that total approximately $150,000 for the preliminary engineering phase. Staff propose paying these expenses from the Roads fund.
Over the past 10 years, Caltrans, the design consultants, and County staff evaluated replacing versus retrofitting the existing bridge. After completing several studies and meeting wit...
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