As part of the Construction Management team, Schnabel supported Silicon Valley Clean Water (SVCW) on this industry leading progressive design build tunnel project. Our personnel supported SVCW throughout the procurement process including technical, commercial, and constructability review of the Request for Qualification, and Request for Proposal documents. During the shortlisting, interviewing, selection, and negotiating phases, we provided technical assistance related to means and methods, schedule, cost estimating, and risk. During the design phase Schnabel provided over the shoulder reviews of the temporary and permanent support for shafts and tunnels, EPBM design and factory testing, protection of structures,  geotechnical instrumentation, and monitoring systems. During construction, Schnabel provided onsite inspection, monitoring of geotechnical instrumentation and EPBM operating parameters, review of submittal documents, technical support, and claims support.

SVCW is undertaking the Regional Environmental Sewer Conveyance Upgrade (RESCU) program to replace and rehabilitate its existing facilities in Redwood City, California. As an important part of RESCU, the Gravity Pipeline project was constructed to convey and equalize wastewater flows traveling to its Wastewater Treatment Plant (WWTP). The project included 3.3-miles of pipeline extending from Bair Island to the WWTP. A precast concrete segmental liner was installed using a Tunnel Boring Machine (TBM) to carry the Fiber Reinforced Plastic (FRP) pipeline required to meet longterm durability. The project also included shafts, drop facilities, and ventilation and odor control facilities. Once put into service, the pipeline will function to convey wastewater to the WWTP under normal operations. During extreme rain events the pipeline will store peak flows for up to two days, mitigating the need for additional capacity upgrades at the plant. The project was built using the Progressive Design-Build contracting method.