What is seepage when tunnel segments are put together?
June 12, 2020When peat dirt is displaced, what mitigation efforts will be made to make sure the peat doesn’t increase the asthma problems in the Delta?
June 12, 2020At a tunnel launch shaft, a gantry style crane probably would be used for support of the tunneling operations, and a temporary concrete pad would be constructed around the shaft to allow for rails of the crane supports and to provide a work area. The concrete pad would be temporary and would be removed following construction. The concrete pad could be approximately 189,000 square feet and about 6 inches thick, or approximately 3,500 cubic yards. This amount of concrete would weigh approximately 7,100 tons.