TO: Board of Supervisors
FROM: Steve Lederer - Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Approval of a Budget Transfer for the "Zinfandel Bridge Approach Scour Project", RDS 24-23
RECOMMENDATION
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Approve a Budget Amendment to appropriate funding from SB-1 Non-Operating Special Revenue Fund for the "Zinfandel Bridge Approach Scour Project." (Fiscal Impact: $100,000 Expense; SB-1 Non-Operating Special Revenue Fund; Not budgeted; Discretionary)
[4/5 Vote Required]
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BACKGROUND
Zinfandel Bridge over the Napa River has been serving the County since 1913. Since its original construction, the valley has experienced several major floods and changes to the channel. 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. During a recent inspection of the bridge a large scour hole was discovered below the concrete wall that was constructed to support the roadway. To design a long lasting and effective repair, engineers need to know how deep the scour will go and what type of forces are expected in the area. Funding is being requested so that a two-dimension hydraulic model can be completed, and initial design started. After this step, staff will have a better understanding of project costs and will return to the Board of Supervisors with a report of findings and a request to fund final design and permitting. The permitting is expected to be rigorous and time consuming, however, staff will emphasize the importance of getting the project completed as soon as possible to the various agencies.
Requested Action:
1. Approve a Budget Amendment for the following (4/5 vote required):
a. Increase Transfers Out appropriations by $100,000 in the SB-1 Non-Operating Special Revenue Fund (Fund 2440, Sub-Division 1220052, Account 56100) (SB-1 SRF) offset by use of its avail...
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