Public Jobs

Project Description: Installation of a 3rd large submersible pump at the recently reconstructed West Napa Pump Station, which includes piping modifications and electrical and instrumentation work. Also included in the scope of work is the following: installation of a sump pump in the flowmeter vault, installation of safety grates, installation of lighting mounted to the solar structure, installation of door switches connected to SCADA, installation of bird netting for the underside of the solar structure, and installation of a platform for the existing odor control unit and generator.

Adjustment of sanitary sewer manholes and sanitary sewer flush holes to grade on various streets within the City of Napa that have been overlaid with approximately 2.5 inches of asphalt concrete. A valid Class A, Class C-34, or Class C-42 California contractor’s license is required to bid on the Project.

Engineer's Estimate: $190,000

The general scope of work for this project includes replacement of two primary clarifier drives and two secondary clarifier metal componets, and a new secondary clarifier coating system. Also included in the scope of work is the replacement of the ferric chloride chemical storage tank, piping, valves, accessories, and coating system replacement; sodium bisulfite chemical storage tank, piping, valves, accessories, and coating system; RAS/WAS wetwell discharge elbows and piping; H-Pad piping valves and pipe coating system; secondary effluent pump station valves; and Pond 4 pump station valves.

The general scope of work for this project included in the base bid and bid alternate is the rehabilitation and/or replacement of 4", 6", 8", 10", 12" and 18" sewer mains by the following methods: Approximately 18,900 LF by cured in place pipe (CIPP) lining, 9,200 LF by pipe bursting, and 850 LF by open cut methods. Also included in the scope of work is the rehabilitation or replacement of approximately 540 laterals and 51 sewer structures within the project area.

The general scope of work for this project is the rehabilitation of 6", 8" and 10" sewer mains by the following methods: Approximately 6,054 LF cured-in-place-pipe (CIPP) lining. Also included in the scope of work is the rehabilitation of approximately 31 laterals, installation of approximately 25 top hats, installation of approximately 17 cleanouts, and removal and replacement of approximately 4 flush holes.

Adjustment of sanitary sewer manholes and sanitary sewer flush holes to grade on various streets within the City of Napa that have been overlaid with approximately 2.5 inches of asphalt concrete. A valid Class A, Class C-34, or Class C-42 California contractor's license is required to bid on this project.

The general scope of work for this project includes removal of three existing hydraulic stop gate frames and replacement with three new corrosion resistant slide gates, removal of three existing manhole frames and covers and replacement with three composite structure frames and covers, and installation of odor control inserts at the existing North Napa Siphon Inlet Structure. The estimated cost of construction is $330,000

Manhole rehabilitation by chemical grout injection (approx 74 manholes).

The work for the 2022 Collection System Rehabilitation Project includes mobilization, demobilization, procurement and installation of materials for the rehabilitation of approximately 33,332 LF of sewer main and associated laterals, manholes, and other structures as shown in the Project technical specifications and plans in the bid package. The main rehabilitation will consist of approximately 33,332 LF of cured in place pipe (CIPP).