TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: James Reese, Associate Engineer
SUBJECT: Amendment No. 2 to Professional Services Agreement No. 190001B with Biggs Cardosa Associates, Inc. for the Greenwood Avenue Bridge over Garnett Creek Rehabilitation Project, Bridge No. 21C-0042, RDS 16-16.
RECOMMENDATION
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Approve and authorize Amendment No. 2 to Agreement No. 190001B with Biggs Cardosa Associates, Inc. (BCA) increasing the contract maximum from $1,108,317 to $1,148,610, to provide additional environmental documentation and cultural resource studies required for the Greenwood Avenue Bridge over Garnett Creek Rehabilitation Project, Bridge No. 21C-0042; and approve a Budget Amendment for the contract amendment and staff cost. (Fiscal Impact: $75,000 Expense; Roads Fund; Not Budgeted; Discretionary)
[4/5 vote required]
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BACKGROUND
The Greenwood Avenue Bridge over Garnett Creek (Bridge No. 21C-0042) was damaged during the August 24, 2014, South Napa earthquake and remains closed to traffic. The bridge is a historic stone arch masonry bridge constructed in 1904 located on Greenwood Avenue approximately 0.2 miles northeast of Myrtledale Road and is listed on the Historic Register of Historic Places (NRHP).
The project proposes to rehabilitate the bridge while preserving the historic structure and restoring access to Greenwood Avenue. Caltrans designated the Bridge as an Off-System bridge and eligible for 100 percent federal Highway Bridge Program funding with Toll Credits as the match for local funds.
Agreement No. 190001B with Biggs Cardosa Associates, Inc. provides engineering and environmental services for the project. On June 17, 2025, the Board approved Amendment No. 1 increasing the agreement by $75,032 to complete additional archaeological and environmental studies required for National Environmental Policy Act (NEPA) clearance.
During the Extended Phase I (XPI) archaeological investigation, the consultant ide...
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