Five months from start to finish: The interceptor project replaced 24- and 30-inch vitrified clay pipelines with 5,600 feet of 60-inch polypropylene pipe. Buried 8 to 22 feet down, the pipe — Advanced Drainage Systems' SaniTite HP — has maintained shape regardless of depth. Photos: Advanced Drainage Systems
Instead of precast concrete, ADS used the 60-inch pipe to fabricate manholes with H-20 load rating and fill heights. Once in place, each was encapsulated in concrete with a field-placed steel reinforcing cage.