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 May 2020

After Salus completed its first drive late-March, the Barnard-Bessac Joint Venture (BBJV) crew began disassembling the Tunnel Boring Machine (TBM) at the Inner Bair Island Shaft retrieval site.

Completed major section removal includes:

  • Middle shield cover – during tunneling this shield acts as a protective structure for the workers. It also functions as a temporary support structure so concrete segment can be installed while Salus tunnels forward.
  • Screw conveyor – assists in efficiently transporting excavated soil onto a conveyor belt that sends it out behind Salus
  • Cutter head – the front segment of Salus responsible for cutting and excavating through the soil

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Gravity Pipeline Project

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