Name of the Project
Northeast Boundary Tunnel (NEBT) project.

Location
Washington DC, in the US. 

The NBET will be 15 m to 49 m below ground and run 8 230 m from Robert F Kennedy Stadium to the intersection of Rhode Island avenue north-west (NW) and 6th street NW. It will be aligned to intersect the existing chronic flood areas along Rhode Island avenue NW.

Client
DC Water.

Project Description
The NEBT is the biggest component of DC Water’s Clean Rivers Project.

The NEBT will be a large, deep sewer tunnel that will increase the capacity of Washington DC’s sewer system, significantly mitigating the frequency, magnitude and duration of sewer flooding and improving the water quality of the Anacostia river.

The NEBT project will include the construction of ventilation control facilities, stormwater inlets and green infrastructure.

In addition to the tunnel, DC Water will be building diversion facilities along the tunnel alignment to capture flows from the existing sewer system and divert them to the tunnel. The NEBT will connect with the First street tunnel and the Anacostia river tunnel to provide a complete gravity system from north-west DC to the Blue Plains advanced wastewater treatment plant, where all flows captured by the tunnel system will be delivered for treatment prior to discharge to the Potomac river.

Once it is connected to the other Clean Rivers Project tunnels, the NEBT will help reduce combined sewer overflows to the Anacostia river by 98%, and the chance of flooding in the areas it serves from about 50% to 7% in any given year.

Potential Job Creation
Not stated.

Value
Not stated.

Duration
Work is expected to begin this month and be completed in 2023.

Latest Developments
Salini Impregilo and The Lane Construction Corporation have won a $580-million contract to build the NEBT.

Key Contracts and Suppliers
Salini Impregilo and The Lane Construction Corporation (construction contract).

On Budget and on Time?
Too early to state.

Contact Details for Project Information
DC Water, email dccleanrivers@dcwater.com.