County of Napa #RDS 26-24

Napa County Mt. Veeder Road Slope Stabilization and Repair Project

Napa County Public Works is seeking qualified contractors for critical repairs and slope stabilization on Mt. Veeder Road at two locations: - Government Buyer: - Napa County Public Works - Project Scope: - Repair and stabilization at milepost markers (MPM) 4.3 and 3.25 on Mt. Veeder Road - Products and Construction Methods: - At MPM 4.3: - Construction of a cast-in-drilled-hole (CIDH) concrete retaining wall, approximately 187 feet long, with wall heights from 4 to 16 feet - Installation of tiebacks for additional lateral support - Repaving of the roadway to restore asphalt surface and drainage - One travel lane to remain open during construction - At MPM 3.25: - Installation of 18-inch diameter stitch piers over 100 linear feet to address slope creep and settlement (no retaining wall at this location) - Unique/Notable Requirements: - Use of CIDH retaining wall construction and tiebacks for slope stabilization - Use of stitch piers as a proactive landslide prevention measure - Requires a Class A contractor license - OEMs and Vendors: - No specific OEMs or product manufacturers are named; solicitation is open to qualified construction contractors - Estimated Contract Value: - Approximately $1,600,000 - NAICS/NIGP/UNSPSC Codes: - NAICS: 237310 (Highway, Street, and Bridge Construction) - NIGP: 91327, 91360 - UNSPSC: 72141000, 72141001

Description

This project involves repairing damage caused by storm events to Mt. Veeder Road at milepost markers 4.3 and 3.25 in Napa County. The repair at MPM 4.3 includes constructing a cast-in-drilled-hole concrete retaining wall approximately 187 feet long with heights ranging from 4 to 16 feet, including tiebacks to support one travel lane during construction, and repaving the roadway to restore the asphalt surface and drainage. At MPM 3.25, stitch piers are proposed to prevent slope creep and potential landslides, consisting of 18-inch diameter piers extending 100 linear feet. The project aims to proactively stabilize the roadway and prevent future damage.

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