The Town of Greenwich, Connecticut has relied on a single three-mile long, 18 to 24-inch diameter cast iron wastewater force main built in 1963 to convey approximately 50% of its wastewater flow. This line snakes between I-95 and the Metro-North Railroad (MNRR), the third busiest commuter railroad in North America. The force main receives flow from three separate pump stations. Due to its age, condition and a Consent Decree from the USEPA (United States District Court, District of Connecticut, 2011), Greenwich has undertaken the difficult task to replace or rehabilitate the remaining cast-iron segments of the force main and contracted AECOM for the design, permitting and construction management. The three-mile force main was divided into 11 manageable segments. Segment 5, 1,400 linear feet of 18-inch cast iron force main, is located within the limits of Riverside Train Station commuter parking lot and a Metro-North access road and is subject of this presentation.This paper will review the details of design, permitting and construction and the unique use of pressure Cured-in-Place Pipe (CIPP) lining in Segment 5 to avoid disturbance to the Riverside Train Station and Metro North operations, as well as construction around high voltage electrical towers and overhead lines.
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