First Street Tunnel, Washington DC

The First Street Tunnel (1stST) project is part of District of Columbia Water and Sewer Authority (DC WASA), DC Clean Rivers Project (DCCR), for control of Combined Sewer Overflows (CSO) to the Anacostia River. The construction for the 1stST project includes, but is not limited to, the following: A large diameter tunnel excavated in soft ground, four shafts, three adit connections, three diversion structures, one inlet structure, internal hydraulic structures, passive odor control system, utility relocations and a pumping station.

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