MWRA North Dorchester CSO Project

Client: Massachusetts Water Resources Authority
Location: South Boston, MA
Services: Construction Inspection and Estimating
Completion Date: 2011

Project Details:
The North Dorchester Bay CSO Project is a $275M project designed to eliminate CSO discharges to South Boston beaches in up to a 25-year storm event and, eliminate separate storm water discharges in up to a 5-year storm event. The project is being constructed as part of the Massachusetts Water Resources Authority’s overall long term CSO control plan, and is the last major milestone of the Boston Harbor Case, Clean Water Act enforcement action in the U.S Federal District Court. Work includes:

• 10,832 foot long, 17-foot finished diameter storage tunnel installed   by soft ground tunneling methods with a pre-cast gasketed   segmental lining, a 50-foot diameter mining shaft and a 36-foot   diameter upstream equipment removal shaft.

• Offset 6 to 8.5-foot diameter drop shafts, diversion structures, connecting adits and associated sluice gates,   underflow baffles, and surface piping at 6 existing outfalls along North Dorchester Bay (BOS081 to BOS086).

• 15 mgd dewatering pump station and 24-inch dewatering force main with connections to the existing South Boston   Interceptor.

Keville Enterprises is part of the Construction Management team overseeing this work. Our scope of services includes construction inspection and cost estimating.