The Sewer Division of the Greenwich (Connecticut) Department of Public Works planned to upgrade critical sewer line at multiple 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, it was a high-profile project. 

The upgrades included hydroblasting deteriorating structures and installing new cement coatings. Further, 600 feet of 39-inch reinforced concrete sewer line required relining with a 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 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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