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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Gravity Pipeline Project

Last Updated July 2020

Salus, the Tunnel Boring Machine (TBM), safely began her second drive from the launch shaft to SVCW’s wastewater treatment facility late June. Barnard-Bessac Joint Venture (BBJV), the contractor partner for the Gravity Pipeline project, connected all of Salus’ electrical components. These components included gantries, a frame structure raised on side supports, that house the equipment needed to power and run the TBM throughout its drive. Gantries also serve as an entryway to deliver concrete support rings to the front of Salus for installation.

BBJV transported the final segments of fiberglass reinforced polymer (FRP) pipes from the Port of Stockton to the storage yard in Sunol. They are wrapped in a protective blue tarp and stored in the yard until ready for installation in the new tunnel created by Salus.

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Gravity Pipeline Project

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