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 January 2021

TBM Status Update – January 26, 2021

Along its current drive, Salus built 1,347 rings and tunneled about 6,765 feet.

BBJV continuously monitors tunneling progress and makes adjustments as needed to ensure safe and smooth tunneling operations. Since the tunneling has been ongoing since June 2020, BBJV is looking to plan a stoppage to inspect Salus’ cutter head for wear and tear. This will help determine its condition, and whether there is need to replace any of these tools.

The first phase of installation of Fiberglass Reinforced Plastic (FRP) carrier pipes is almost complete.

January 2021 Monthly Update

SVCW’s contractor partner, Barnard-Bessac Joint Venture (BBJV), continued to make significant and safe tunneling progress with Salus, the Tunnel Boring Machine (TBM).
With Salus due to arrive at the Front of Plant, BBJV and SPJV are working closely to coordinate Salus’ arrival and break in. Within the completed tunnel from Salus’ first tunnel drive, BBJV has been installing segments of the Fiberglass Reinforced Plastic (FRP) carrier pipe, which will carry the raw wastewater to the SVCW Treatment Plant. More than half of the 187 pipes have been installed in the tunnel. The remaining pipes are being stored on Inner Bair Island.

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Gravity Pipeline Project

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