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Flat Branch Sanitary Interceptor Sewer. Prince William County, Virginia.

WRA provided construction phase services for two concurrent large diameter (48” - 60”) gravity delivery sewer projects including full-time resident construction inspection services for the $12M Cub Run Contract and the $10M Flat Branch contract.

The Flat Branch Interceptor Upgrade (FBIU) involved installing over 16,000 linear feet of large diameter (48”to 78”) composite sewer including several tunneling operations for crossings under VDOT roadways. Complex coordination of impacted utilities and roadway crossings was required including coordinating with VDOT, Prince William County Service Authority, Prince William Park Authority and local communities impacted by the construction. Unique testing procedures and equipment were required to test each installed pipe joint. Our inspection personnel received specialized training in the utilization of the testing equipment (Cherne Air-Loc Joint Tester) as well training by the pipe supplier (Hobas) in the proper techniques for storing, installing and testing the composite pipe.