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New Irvington Tunnel Bay Division Pipeline (BDPL) Reliability Upgrade– TUNNEL New Irvington Tunnel Bay Division Pipeline, (BDPL), Bay Tunnel, Ravenswood, Demobilization of the mining equipment and infrastructure Water System Improvement Program, New Irvington Tunnel Harry Tracy Water Treatment Plant, Long-Term Improvements, interior treated reservoir New Irvington Tunnel, Mortar lining 6000ft from the Vargas heading to West Portal. Lining the steel pipe with a layer of concrete to protect the pipe. A mixture of cement and sand.