Atlanta CSO Constructors, a joint venture between Obayashi and MassAna, is constructing two Combined Sewage Overflow (CSO) tunnels for the city of Atlanta in Georgia.

Passing through fine to medium-grained gneiss, the tunnels, with a finished diameter of 24 feet, will be 21,013ft and 23,425ft in length.

Each DBT Continuous Muck Haulage System will have a belt width of 36 inches and have approximately 23,000ft of idlers and structure.

Each belt conveyor is equipped with an advancing tailpiece, 6 x 200 HP drives, a remote discharge and an AC electric winch storage unit. The system has a capacity of 800 tons per hour.

The belt systems are scheduled for an initial delivery in June 2005, with tunneling scheduled to start in July/August 2005.