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 design work and environmental review. The final design and environmental documents were submitted to local, state and federal agencies, however permission to work in the creek has not been granted yet. On September 9, 2025, the Board awarded the first phase of this project which focuses on constructing improvements outside of the creek and will make it possible to launch a bridge if existing impound fails this winter.
Amendment No. 1 provides scope for construction inspection for this year’s work and archaeological, biological and cultural monitoring for the project. This amendment also provides funding to prepare a submittal for the prefabricated bridge which will accelerate delivery. The County expects permits for Phase 2 of the project which will allow for the removal of the earthen impound, re-grading the creek and installation of the new bridge in time for the next construction season.
Requested Actions:
1. Approve and authorize Amendment No. 1 to Agreement No. 250353B increasing the maximum compensation by $206,931 for a contract maximum of $555,378 with ADKO Inc. for the Rossi Bridge project.
FISCAL IMPACT
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Is there a Fiscal Impact? |
Yes |
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Is it currently budgeted? |
Yes |
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Where is it budgeted? |
Roads CIP Project 25034 |
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Is it Mandatory or Discretionary? |
Discretionary |
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Discretionary Justification: |
This action is needed to ensure public and emergency access and meets permit requirements. |
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Is the general fund affected? |
No |
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Future fiscal impact: |
The second phase of this project will be completed in FY 25-26. The site will also require funding for mitigation planting and reporting for 5-10 more years after the completion of the second phase. |
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Consequences if not approved: |
If this project isn’t approved and the region receives moderate rain this winter, there is a good chance that the road will fail and there won’t be a method to restore access until the end of next summer. |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The proposed action is not a project as defined by 14 California Code of Regulations 15378 (State CEQA Guidelines) and therefore CEQA is not applicable.