The San Francisco Bay Area’s primary water supply system, highly vulnerable to seismic damage from the nearby San Andreas and Hayward fault zones, consists of aging and deteriorated pipelines crossing under the Bay. The 5-mile Bay Tunnel Project will replace this system with the first tunnel excavated by a TBM underneath the Bay and environmentally-sensitive salt marshes with no intermediate shafts. Contract includes two shafts which will serve as a means of conveyance, access and temporary ventilation for the completed Bay Tunnel project. This paper presents the design considerations and slurry wall construction method of the 136-feet deep Ravenswood shaft.
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