TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Dewey Phan, Assistant Engineer
SUBJECT: Construction Contract Award for the "Mt. Veeder Road MPM 4.3 and MPM 3.25 Project, RDS 26-24"
RECOMMENDATION
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Award a Construction Contract to Piazza Construction of Penngrove, California, in the amount of $1,268,000 for the "Mt Veeder Road MPM 4.3 and MPM 3.25 Project, RDS 26-24". (Fiscal Impact: $2,220,799 Expense for the construction contract and other project costs; General Fund, Reallocation of Budget; Discretionary)
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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 extending approximately 187 feet. The crib 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 March 10, 2026, the Board of Supervisors authorized creation of the "Mt Veeder Road MPM 4.3 and MPM 3.25 Project, RDS 26-24" (Project 26024) and a budget transfer of $456,986 was allocated for the project using the Roads Fund (Fund 2040, Sub-Division 2040000). Of this amount, $376,986 wa...
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