What is the Gravity Pipeline Project?

The Gravity Pipeline (GP) Project consists of the design, construction, permitting, start-up, commissioning, and closeout of approximately 17,600 feet of wastewater gravity FRP pipe inside a concrete-segment tunnel. The work includs three shafts and will interface directly with the Front of Plant (FoP) Project at the Receiving Lift Station (RLS). Work is being implemented under a Progressive Design-Build procurement process.

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What's Happening

Gravity Pipeline Project

Last Updated June 2022

Following the completion of fiberglass reinforced polymer (FRP) pipe install inside the gravity tunnel, SVCW’s contractor partner for the Gravity Pipeline project, Barnard BessacJoint Venture (BBJV), is making headway towards conclusion of the gravity pipeline construction. BBJV continues site restoration at the Airport Access Shaft (AAS) site. As part of the restoration activities, the crew placed backfill to support and protect the completed pipe in the shaft, and is now working on backfilling the shaft to raise it to match the pre-construction ground surface elevation. Final construction inspections of the tunnel have been completed in the last two months as BBJV prepares to complete the final steps in construction and demobilization. All of the restoration and quality control work is being performed with a high level of coordination with Quality Assurance inspectors.

With the Gravity Pipeline project in its last phase of work, SVCW and BBJV are working together with the other RESCU project teams to coordinate the startup activities for the entire rehabilitated SVCW wastewater conveyance system. The startup of the conveyance system requires additional coordination with the Front of Plant and Pump Stations Improvements projects as the Gravity Pipeline tunnel is the connector to carry flows from the pump stations to the new Receiving Lift Station and new headworks at the Front of Plant site. Startup coordination activities will be ongoing throughout the RESCU Program through the end of 2022.

 

Completed pipe in the Airport Access Shaft

Inlet structure installed at the San Carlos Pump Station

AAS site restoration

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Gravity Pipeline Project

Gravity Pipeline August 2021

With Salus, the Tunnel Boring Machine (TBM), successfully completing its second tunneling drive, SVCW’s contractor partner, Barnard-Bessac Joint Venture (BBJV),

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