October 1, 2008The District of Columbia Water and Sewer Authority (WASA) plans to rehabilitate more than three miles of 10-ft diameter sewers. The sewers to be rehabbed are the influent sewers to the Blue Plains Advanced Wastewater Treatment Plant.
The project, titled “Blue Plains Influent Sewers Rehabilitation,” includes: rehabilitation and repairs for corrosion protection and/or structural repair for pipe segments of the East and West influent sewers; modifications to several structures and manholes; a structure at the Poplar Point Pumping Station; and flow control during construction.
Planned rehabilitation methods for this project include glass reinforced panels (GRP), sliplining, spiral wound (SPR), shotcrete and epoxy coating.
The sewer pipes are between 30 and 100 years old and are constructed of brick and concrete. They have been inspected and structural testing and flow monitoring have been done. Sections of the pipe have deteriorated to expose the aggregate and reinforcing steel. The majority of the sewer lines are located inside federal property, such as Bolling Air Force Base and the Naval Research Laboratory.
Cost of the project is projected to be $30 million to $40 million.