TO: Board of Supervisors
FROM: Steve Lederer, Director of Public Works
REPORT BY: Liang Chin Su, Assistant Engineer
SUBJECT: Approval of Plans and Specifications and Authorization to Advertise for Bids for the “550 Wall Road Landslide Repairs”, RDS 26-38
RECOMMENDATION
title
Approve the Plans and Specifications for the “550 Wall Road Landslide Repairs”, RDS 26-38; and authorization to advertise for sealed bids and opening of the bids at a time, date, and location to be published by the Director of Public Works pursuant to Section 20150.8 of the Public Contract Code. (No Fiscal Impact)
body
BACKGROUND
Two slides occurred on Wall Road in November of 2025: one adjacent to the slide at 555 Wall Road that developed during the 2019 storms, and a second approximately 500 feet north of the first. The 2019 Wall Road slide remains mired in the FEMA review process and will move forward to construction once the necessary approvals are received. Both 2025 slide locations exhibit roadway and embankment failure along the north side of the roadway, where portions of the pavement and supporting slope have moved downslope, compromising the stability of the remaining roadway. The slide areas are approximately 70 linear feet and 30 linear feet in length, respectively. The designed repairs for both locations are the construction of reinforced concrete retaining walls, approximately four to six feet in height, supported by cast-in-drilled-hole piles. In addition, approximately 100 feet of roadway, 42 feet in width, will be reconstructed and paved at each slide location to restore roadway integrity and pavement conditions.
On March 10, 2026, the Board of Supervisors authorized creation of the “550 Wall Road Landslide Repairs” project and a budget transfer of $399,389 was allocated for the project using the Roads Operating Fund Budget (Fund 2040, Sub-Division 2040000, Project 26028). Of this amount, $319,389 was allocated for design services and $80,000 for staff time.
Fiscal Year 2026-27 recommended budget will include $7 million for all 2025 November Storm Project construction from the release of designation for fiscal uncertainty. It will be budgeted in RDS01 “November 2025 Storm Roads CIP.” As each project moves forward, budget will be reallocated from RDS01 to specific projects.
The Engineer’s Estimate for the 550 Wall Road Landslide Repairs project is $667,000. The Plans and Specifications are complete and ready for approval by the Board of Supervisors, which are available to view on the <https://www.napacounty.gov/1607/Current-Projects> website. County staff will return to the Board of Supervisors to present a detailed project budget based on the lowest responsible bid and to request a budget amendment and authorization to award.
Requested Actions:
Approve Plans and Specifications for the “550 Wall Road Landslide Repairs”, RDS 26-38 and authorize to advertise for sealed bids.
FISCAL IMPACT
|
Is there a Fiscal Impact? |
No |
|
Is it currently budgeted? |
No |
|
Is it Mandatory or Discretionary? |
Discretionary |
|
Discretionary Justification: |
Repairs are necessary to prevent further damage and ensure public safety. |
|
Is the general fund affected? |
No |
|
Future fiscal impact: |
Construction is anticipated to begin during FY 26-27. Staff will return after bid opening for a budget transfer of the full project cost. |
|
Consequences if not approved: |
The road will not be repaired and cause public safety hazard. |
|
Strategic Initiative: |
Build healthy, connected communities. |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: Consideration and possible adoption of a Categorical Exemption Section 15301 Class 1 - Existing Facilities and Section 15302 Class 2 - Replacement or Reconstruction: It has been determined that this type of project does not have a significant effect on the environment and is exempt from the California Environmental Quality Act. [See Class 1 (“Existing Facilities”) and Class 2 (“Replacement or Reconstruction”) which may be found in the guidelines for the implementation of the California Environmental Quality Act of 14 CCR §15301; see also Napa County’s Local Procedures for Implementing the California Environmental Quality Act Appendix B.]