Contract 3 of the Mill Creek Tunnel (MCT-3) is the last of three interconnected tunnel projects constructed by NEORSD in the Mill Creek drainage area. When fully operational, the tunnel system will provide an outlet for the relief of presently overloaded sanitary and combined sewers, thereby lessening overflows to the environment and alleviating sewer backups and basement flooding problems.
The 15,600 foot long tunnel will be 20 feet in finished diameter, except between Shaft 9 and the MCT-2 Tunnel, where it will be 10 feet in finished diameter. The tunnel will be at a depth range of 200 to 290 feet below the land surface, and will include access and flow drop shafts near the Trolley Parking Lot in Garfield Reservation (Shaft 9), at two sites near existing overflows or sewer crossings within the Reservation (Shafts 9A and 12A), at an existing overflow near Henry Street and McCracken Road (Shaft 12), at a confluence of existing sewers and regulators near McCracken Road and Broadway Avenue (Shaft 13), and at the tunnel's upstream terminus in Kerruish Park (Shaft 14). An access-only shaft (Shaft 13A) was added to the project after construction started. The shaft was constructed to improve ventilation in a limited zone of the tunnel where methane gas persisted. Shaft 13A is located near McCracken Road and Johnson Parkway.
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