Wise Tunnel No. 9

The Wise Tunnel No. 9 project consisted of reinforcing the existing tunnel liner utilizing a pressure grouting process.

Completed in two phases, a total of 920 linear feet (lf) of tunnel liner were drilled and stabilized with injected non-shrink grout.

Phase No. 1, completed in 2007, stabilized 600 lf of tunnel liner with the placement of 536 cubic yards (cy) of grout. Phase No. 2, completed in 2009, finished the required reinforcement, stabilizing an additional 440 lf of tunnel liner with the placement of 387 cy of grout.

Both phases were completed during critical outage periods with a limited duration of 20 days. The work was performed in accordance with Cal/OSHA – Title 8, Tunnel Safety Orders.

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