Emad Iskander, Ph.D., PE performed the design review of slurry wall shafts, Sequential Excavation Method (SEM) adits connecting to the tunnel, and support of excavation for near-surface structures.
The century-old combined sewer system in the District of Columbia was not equipped to handle the population growth experienced during the last 100 years. The sewer system was undersized and has caused chronic flooding in the Bloomingdale and LeDroit Park neighborhoods, at the Rhode Island Metro Station area, and on Mount Olivet Road NE for decades. To address the problem, DC Water has initiated the construction of the Northeast Boundary Tunnel (NEBT) to connect with the existing sewer system, significantly mitigating sewer flooding while improving the water quality of the Anacostia River. At approximately 27,000 ft in length, the NEBT is the largest component of the Clean Rivers Project and will start just south of RFK Stadium and extend north to Rhode Island Avenue and west to R Street NW.