TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Approve Plans & Specifications, Award of Construction Contract, and Budget Transfer for the "Zinfandel Expedited Repair Project", PW 24-23
RECOMMENDATION
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Approve the Plans & Specifications for the Zinfandel Expedited Repair Project, PW 24-23; award a construction contract to Pomilia Civil of Redwood Valley, CA in the amount of $159,809 for the Project; and approve a Budget Amendment. (Fiscal Impact: $600,000 Expense; Capital Improvement Projects Fund; Not Budgeted; Discretionary)
[4/5 vote required]
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BACKGROUND
On November 20, 2024, a 72-hour storm event started at Napa County that eventually caused two slides on Mount Veeder and significant scour to the roadway approach on the west side of Zinfandel Bridge (over the Napa River). Damage is estimated to be in the $6 to 7 million range for all the three sites. However, the situation is still evolving. Design and construction for the slides is expected to start in February of 2025 and construction completed by next winter. The work on Zinfandel Bridge needs to start sooner to prevent potential additional damage to the bridge. This design work for this Project is provided by ADKO Engineering who was previously selected through an RFQ process for potential emergency repairs such as these.
The historic stone arch Zinfandel Bridge over the Napa River was constructed in 1913. Since its original construction, the valley has experienced several major floods and changes to the channel and overbank. At some point a concrete wall was constructed adjacent to the southwest corner of the bridge to provide additional support to the roadway and in 2013 a major project was completed underneath the bridge to promote fish passage. Since the fish passage project, the bridge has been monitored and recently a scour near the concrete wall began to appear. On May 7, 2024, the Board approved $100,...
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