All soils excavated during construction, including reusable tunnel material (RTM), would be tested for the presence of constituents, including mercury. The concentration of these constituents would be compared to criteria developed by the SWRCB, Regional Water Quality Control Board, California Department of Fish and Wildlife and U.S. Fish and Wildlife Service prior to use in habitat projects as well as any other disposal proposal. For soils with constituent concentrations higher than allowed criteria, soil treatment could be used to remove specific constituents, or other disposal plans would be developed.