TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Dewey Phan, Assistant Engineer
SUBJECT: Approval of Plans and Specifications and Authorization to Advertise for Bids for the "Mt. Veeder Road MPM 4.3 and MPM 3.25 Project, RDS 26-24".
RECOMMENDATION
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Approve the Plans and Specifications for the "Mt. Veeder Road MPM 4.3 and MPM 3.25 Project, RDS 26-24" 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)
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BACKGROUND
Damage was caused to Mt. Veeder Road MPM 4.3 from the storm events occurring in Napa County in November 2025. Intense rainfall saturated the road embankment causing a downhill slide approximately 160 feet long at Mt. Veeder Road MPM 4.3 near Lokoya Road. The slide repair will include constructing a cast-in-drilled-hole (CIDH) concrete retaining wall with concrete lagging extending approximately 187 feet. The wall heights are 4 feet to 16 feet. Tiebacks will be installed to provide additional lateral support and allow for one travel lane to remain open during construction. Repaving the roadway will restore the asphalt concrete surface and pre-slide drainage patterns.
At Mt. Veeder Road 3.25, an approximately 100-foot-long area of the downslope (northbound) lane is experiencing significant slope creep and settlements. This is typically followed by a land slide in future storm events that will threaten the road. To be pro-active, and instead of building an expensive retaining wall, stitch piers are proposed to help prevent the roadway from sliding. The stitch piers are 18" in diameter and extend 20 linear feet deep into the ground.
On 3/10/25, the Board of Supervisors approved $456,986 for the design phase of the project. The Engineers estimate to repair the roadways are $1,200,000 and $362,000 for the Mt. Veeder Road MPM 4.3 and Mt. V...
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