The rehabilitation of the Potomac Interceptor (PI) sewer at Waxpool Road in Sterling, Virginia was approximately 4,720 feet of the 48-inch diameter where Cured-in-Place Pipe (CIPP) technology was used.
A resin-saturated felt tube is inverted into the pipes by using high water pressure. The project also utilized the VeriCure system to monitor the curing temperature continuously along a CIPP liner during installation. A detailed bypass plan was develop to ensure the sewer system stayed active during the entire installation process. Additionally, the PI varied in size from 30-inch to 96-inch diameter round, reinforced concrete pipe in the main trunk to 13-foot by 7.75-foot rectangular, reinforced concrete pipe in the lower reaches of the sewer system.
The PI sanitary sewer system conveys approximately 50 million gallons per day of wastewater by gravity from several service areas starting near the Washington Dulles International Airport, along the Potomac River to the Potomac Pumping Station in Washington, DC.