CDM designed and performed the first large-scale pipe bursting project sewer replacement that increases pipeline size without excavation—to accommodate disproportionally high wet weather flows in portions of Somerset's 200-mile-long collection system. CDM's analysis determined that the 1-mile-long, 18-inch-diameter reinforced concrete Somerset Hills interceptor (SHI) was suffering from hydrogen sulfide deterioration and needed enlarging. To avoid traditional excavation that would have been highly disruptive, particularly in easements, CDM performed open-cut and trenchless pipe replacement—a more cost-effective measure than conventional methods. Design of the 5,663-foot enlargement program was challenging since the SHI traversed two wetland areas and multiple, extremely narrow (10-foot) easements in residential areas.
This project won an Honor Award from the American Consulting Engineers Council in 1999.
CLIENT: Franklin Township Sewerage Authority
LOCATION: Somerset, New Jersey