- Location: Redwood City, California
- Owner: Silicon Valley Clean Water
- Engineer(s): Arup
- Partner(s): Bessac
- Contract Type: Progressive Design-Build
- Status: Currently in design phase
Silicon Valley Clean Water’s (SVCW’s) wastewater conveyance system serves more than 200,000 people and businesses in the San Francisco Bay area, including the cities of Belmont, Redmond City, and San Carlos, and the West Bay Sanitary District. Due to significant population growth and a nearly exceeded maximum design life, their more than 45-year-old system is failing and in need of replacement. In a continued effort to keep the San Francisco Bay clean and safe, SVCW is working to improve the reliability of the conveyance system. As one part of SVCW’s Regional Environmental Sewer Conveyance Upgrade (RESCU), the gravity pipeline project includes the design and construction of 3.3 miles of a 16-foot-diameter gravity pipeline tunnel to replace their existing system.
Wanting to collaborate with a contractor and designer from the project’s earliest stages, SVCW joined in a Progressive Design-Build agreement with Barnard Bessac JV, along with design engineer Arup, to design and construct the gravity pipeline. Barnard Bessac JV and Arup are working with SVCW to take the design of the gravity pipeline project from 10 percent to 100 percent. To ensure contractor involvement from the design phase continuing through construction, SVCW divided the contract into two stages, where Stage 1 takes the design to 60 percent, and Stage 2 brings the design to 100 percent and includes all required gravity pipeline tunnel and shaft construction. With the requirements of the project having a 100-year design life and a 10-year design life warranty, the Progressive Design-Build Team is evaluating several design alternatives for a cost-effective, corrosive-resistant lining that will have maximum resiliency with minimal maintenance over the course of 100 years. Once in the construction phase, the tunnel excavation will be performed with an EPB TBM and will extend from Inner Bair Island south of San Carlos Airport to SVCW’s Wastewater Treatment Plant in Redwood City, California.
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