Xylem’s Bypass Enables Critical Upgrades for Aging Sewer Lines in Greenwich, Connecticut

Sewer Division of the Greenwich Department of Public Works

Greenwich, Connecticut

The Sewer Division of the Greenwich Department of Public Works planned to upgrade critical sewer line at multiple sewer manholes along Bruce Park Avenue, a busy roadway parallel to Interstate 95 in downtown Greenwich. Given the proximity to the town center and substantial traffic volume, the project was high-visibility and high-profile.

The upgrades included hydro-blasting deteriorating structures and installing new cement coatings. Further, 600 feet of 39-inch reinforced concrete sewer line required re-lining with a cured-in-place pipe (CIPP) liner solution. As is typical with this type of sewer line rehab, Greenwich needed a temporary sewer bypass before work commenced.

The Town’s consulting engineer, CDM Smith worked together with Xylem to develop a temporary sewer bypass plan. The Xylem-designed bypass, which would be installed by A Vitti Excavators, needed to handle nearly 17 million gallons per day (MGD) of combined flow from three sewer lines – a 24-inch gravity line, and 8-inch and 24-inch force main sewer lines – and redirect it into a 45,000-gallon temporary concrete wet well.

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