Can the existing tunnels be inspected and repaired without incurring the $550 million to $1.4 billion cost of constructing a new tunnel/ocean outfall?
The Sanitation Districts are currently investigating the feasibility of inspecting the existing tunnels, but it is evident that such an operation, if possible, would present immense technical challenges and high risks. In order to thoroughly assess the condition of the existing tunnels, each tunnel would need to be inspected in a dry state, which would require constructing new facilities to hydraulically separate the tunnels to make them independent and temporarily diverting approximately two-thirds of the wastewater currently treated by the JWPCP. A diversion of at least 200 million gallons per day (mgd) would be required.At this time, the Sanitation Districts have not been able to identify a means of diverting this much flow to allow for an inspection.
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