$100 million project involving 4.12 km-long x 4.12 m i.d. North Dorchester Bay and 830 m-long x 4.12 m i.d. Reserved Channel CSO consolidation conduits to be constructed mainly in glacial outwash sands and Boston Blue Clay at depths of 8 m to 17.5 m for MWRA. Tunnels to be constructed from large diameter shafts and connections with existing CSO outfalls to be made by drop shafts. Visit www.pbworld.com August 2000.The Massachusetts Water Resources Authority approved a USD300 million project which includes a 3.4 km 5.2 m-diameter tunnel near the shoreline in Dorchester and south Boston to collect the mix of storm water and sewage and hold it for processing. It also includes an odour control station at Carson Beach and a pumping station to be built at Conley Terminal in south Boston. If approved by state environmental officials, the project plans a "Little Dig" under Day Boulevard and Columbia Road, with a TBM burrowing the tunnel through soft ground. The tunnel is expected to start processing water when the station is completed in 2011. The plan is designed to close a gap in the USD4.5 billion Boston Harbour cleanup. Rain can overwhelm the city's combined system of storm drains and sewers, pushing untreated waste straight into the harbour. Visit www.mwra.state.ma.us 17/04.The Massachusetts Water Resources Authority (MWRA) on 19th July, 2006 awarded a USD145.7 million contract for the construction of a 5.2 m-diameter, 3,380 m-long tunnel in South Boston that will virtually eliminate combined sewer overflows (CSOs) and stormwater discharges to the beaches in South Boston. The contractor, a joint venture of Shank / Balfour Beatty / Barletta, will construct the North Dorchester Bay CSO storage tunnel in soft ground using a pressurized face TBM. The work will include a mining shaft at the downstream end of the tunnel, an equipment removal shaft at the upstream end of the tunnel, six intermediate drop shafts at the existing CSO outfalls, CSO and stormwater diversion and odour control structures, and associated shallow piping and utility conduits. The tunnel is expected to be completed in 2009. Visit www.balfourbeatty.com and www.mwra.state.ma.us 31/32/06.A JV team led by Hatch Mott MacDonald (HMM) will provide construction management services for the Massachusetts Water Resources Authority's North Dorchester Bay CSO storage tunnel project, which forms part of a programme to eliminate CSO discharges into North Dorchester Bay in South Boston. The project will include an approximately 3,380 m-long, 5.2 m inside diameter tunnel. Start of construction is anticipated in late 2006. Visit www.hatchmott.com and www.mwra.state.ma.us 31-32/06.