DC Water Main Pumping Station

Location: Washington DC
Owner: DC Water Authority
General Contractor: Corman Construction
Date Complete: December 2015

Brayman was subcontracted by Corman Construction to provide specialty construction services in support of the DC Water Division I Main Pumping Station Diversions project, located in Washington, DC.

The scope requires installation of a secant pile excavation support system comprised of 152, 48" diameter interconnecting secant piles (12,309 lf) with depths up to 91 feet and 149, 18" diameter augercast piles for structure foundation support. The secant piles will be incorporated into the final below-grade wall systems for the various process structures on the project.

The work will take place at the project site, located immediately adjacent to the DC Water Main Sewerage Pumping Station and Washington Nationals Stadium. The DC Water Main Sewerage Pumping Station was constructed in 1904-1907 and is on the National Register of Historic Places.

The Division I Main Pumping Station Diversions project is a part of the DC Clean Rivers Project, which represent DC Water's Long-Term Control Plan (LTCP) that is required for compliance with the U.S. Environmental protection Agency (EPA) National Pollutant Discharge Elimination System (NPDES) permitting.

The secant piling drilling work will be performed using 1200mm segmental casing with a Bauer BG39 drill rig from Equipment Corporation of America (ECA). The drill was erected onsite the week of March 30 and we began drilling the primary secant piles on April 7. The BG39 is 110-feet tall with the mast erected, weighs over 293,000 lbs, and is able to provide 287,000 ft-lbs of torque and 90,000 lbs of crowd force.

Part of the secant piling work will connect with the exit shaft for the Blue Plains Tunnel. The Blue Plains tunnel is a 26-foot diameter, 5-mile long tunnel that is currently being constructed 100 feet below the Anacostia River level in order to provide a direct connection between DC Water's Main Pumping Station and the Blue Plains Advanced Wastewater Treatment Plant, which is located across the river. The "Lady Bird" Tunnel Boring Machine (TBM) has completed 4 miles of its 5-mile journey and has just arrived at the Poplar Point Junction Shaft, 1 mile away from the Main Pumping Station on the other side of the Anacostia. Lady Bird will arrive at the Main Pumping Station sometime mid-summer and will be pulled out of the exit shaft adjacent to Brayman's work.