TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Approve Professional Service Agreement Amendment 1 with ADKO Inc. for the "Rossi Road Bridge Replacement Project," RDS 25-25
RECOMMENDATION
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Approve and authorize Amendment No. 1 to Agreement No. 250353B with ADKO Engineering Inc, to increase the maximum compensation from $348,447 to $555,378 for the Rossi Bridge Project, RDS 25-25. (Fiscal Impact: $206,931 Expense; Capital Improvement Projects Fund; Budgeted; Discretionary)
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BACKGROUND
The crossing on Rossi Road that bridges over Conn Creek is unique in that it was originally constructed by private owners in the early 1900's by placing three iron culverts in the creek and placing soil on top which partially impounded the creek. In the late 1920's the County assumed responsibility for the road and constructed an additional concrete box culvert and headwall to allow for more capacity.
In early February of 2025, a storm event caused significant damage around Napa County including the Rossi Crossing. One of the iron culverts collapsed and the concrete headwall was severely damaged. As a result, the County had to close Rossi Road at the location, which is the only public access to a business and 7 or 8 residences as the site was too unstable. A private property owner allowed limited local traffic access through their property while the site dried out for a few weeks. Eventually, road crews were able to remove some oversaturated soil, the collapsed culvert and place temporary stabilization measures that allowed reopening of the road on March 27, 2025.
The Board ratified a local emergency proclamation on February 18, 2025, and approved $2,000,000 in funding for the Rossi Road Bridge Repair Project. On March 11, 2025, the Board approved a $348,447 contract with ADKO Inc., who was previously selected in a request for qualifications process for storm repair projects to complete de...
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