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Anacostia River Tunnel
Location: Washington, DC
Owner: DC Water and Sewer Authority
Construction Cost: $253 million
Project Type: Tunneling | Procurement Type: Design-Build
State: District of Columbia | Status: Ongoing
Lane, in a joint venture with Salini Impregilo, Lane's parent company, worked on the design-build construction of a tunnel that runs from RFK Stadium traveling south down the Anacostia River to a junction shaft at Poplar Point in Washington, DC.
DC Water and Sewer Authority’s long term CSO control plan includes a system of tunnels to control combined sewer overflows into the Anacostia River, Rock Creek, and the Potomac River and transport those captured flows to the Blue Plains Advanced Wastewater Treatment Plant.
The Anacostia River Tunnel is one component of this long-term control plan. The project was completed in late 2017 and has contributed to an increased capacity of the District’s sewer system, significantly mitigating the frequency, magnitude, and duration of sewer flooding. It is also helping to improve the water quality of the Anacostia River.
The project consisted of the final design and construction of the following main components:
- Approximately 12,500 feet of 23-foot minimum inside diameter tunnel, with bolted/gasketed precast concrete liner
- Six shafts with various configurations that include hydraulic internal structures, vortex drop facilities, and diversion chambers
- Two shafts constructed at CSO-019 and connected by an interconnecting tunnel constructed by Sequential Excavation Methods
- Diversion chambers with connecting diversion sewers and approach channels at two shaft locations
- Adit tunnels to connect the shafts to the tunnel at three shaft locations
- Odor control and venting facilities at five sites
- The Poplar Point Shaft will be used to retrieve the TBM and will contain a junction structure to connect to the Blue Plains Tunnel
- Ancillary work, including electrical and mechanical installations, landscaping, and partial commissioning