Description
This solicitation calls for the design‑build execution of a comprehensive safety‑improvement program on a 1.5‑mile stretch of Vasco Road in Contra Costa County, including roadway widening, median barrier installation, bridge widening, drainage upgrades, mechanically‑stabilized earth (MSE) retaining walls, wildlife crossings, and extensive traffic‑control management. The work must comply with Caltrans 2025 specifications, stringent seismic design criteria, and numerous environmental permits (CDFW LSAA, HCP/NCCP, SWRCB storm‑water permits). Bidders must provide a 10 % bid bond, 100 % performance and payment bonds, and demonstrate Class A contractor licensing and prevailing‑wage compliance. The project’s timeline is 230 working days from Notice‑to‑Proceed, with a pre‑bid conference on August 20 2026 and a bid opening on September 15 2026.
• Roadway widening, median barrier, and pavement works (≈ 6,900 ft of new pavement).
• Bridge widening over Brushy Creek (new precast girder, driven‑pile foundations).
• Installation of MSE walls, rock‑slope protection, drainage structures, and wildlife under‑passes.
• Comprehensive traffic‑control plans, including reversible lane closures and pilot‑car operations.
• Mandatory environmental compliance: CDFW LSAA, habitat mitigation, hazardous‑waste handling, and SWRCB storm‑water permits.