“Newtown Road Sanitary Sewer Rehabilitation”
Poplar Hall Davis Corner Trunk 24-inch Gravity Sewer Improvements (CE011600)
HRSD is undertaking a project to rehabilitate sanitary sewer pipes and manholes along Newtown Road from HRSD’s pump station located at 107 S. Newtown Road to the intersection of Elam Avenue and Newtown Road. This effort will increase the sewer system lifespan, decrease the amount of rainwater that enters into the sanitary sewer system via inflow and infiltration, and decrease the risk of sewer system failures.
Reducing inflow and infiltration of rainwater into the sanitary sewer system should help reduce the risk of sanitary sewer overflows (SSOs) during heavy rain events such as Nor’easters or hurricanes. The Cured in Place Pipe (CIPP) system is anticipated to be used accomplish this task. CIPP is one of several trenchless methods used to rehabilitate existing pipelines. Little to no digging is involved in this process, making it potentially more cost-effective and less disruptive than traditional “dig and replace” pipe repair methods. CIPP is a jointless, seamless, “pipe-within-a-pipe” process.
The sanitary sewer must first be prepared for lining; this includes cleaning the pipeline, removing roots, sediment, and grease from the sewer. The sewer pipelines and manholes are inspected using closed circuit television (CCTV). Like many types of pipeline rehabilitation, CIPP requires a bypass pumping system to be setup during the rehabilitation process. This bypass system re-routes sewer flow around the section of pipe being rehabilitated and ensures your sewer service is not interrupted.
The lining process involves the insertion of a resin-saturated flexible lining into an existing sewer pipeline using the manholes located within the street. The lining looks like a very large sock or flexible tube. Either air or water, under pressure, is forced into the tube, which turns the lining inside out and causes it to expand to fit tightly against the existing sewer walls. Hot air or water is circulated throughout the tube to harden the resin. When the curing process is completed (4-8 hours), a new “pipe-within-a-pipe” has been created, eliminating cracks and holes that allow rainwater and roots to enter the sewer and cause operational problems such as stoppages and overflows.
To see pictures of what the CIPP and bypass system look like, please see the CIPP & Bypass System Fact Sheet.
Project Cost: Approximately $5 Million
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