How deep would a new tunnel be? How far out into the Pacific Ocean would the new outfall discharge?

In order to minimize or eliminate impacts at the ground surface (e.g. , noise, vibration, and utility conflicts), the Sanitation Districts would propose deep tunnel construction utilizing state-of-the-art tunnel boring machines (TBMs). The depth of a new tunnel would fluctuate because of variations in the overlying topography, but, in general, a tunnel could reach depths up to 450 feet below the ground surface.It is anticipated a new ocean outfall would extend to the continental shelf, at least 1.5 miles off the coast to an ocean depth of approximately 175-200 feet. More.

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