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United States

McAlinden P.,Merco | McAlinden J.,Merco | Frost D.,Merco
World Tunneling | Year: 2014

The US Environmental Protection Agency, Occupational Health and Safety Administration (OHSA), New York State Department of Environmental Conservation, New York State Department of Labor, and New York State Department of Health oversaw the project. The Tunnel Drain Collection System consists of an access shaft 24ft (7.31m) in diameter and 220ft (67m) in depth with the bottom 24ft (7.31m) of the shaft belled out to a diameter of 42ft (12.8m). Tunnel 3 begins at WR-1 heading at approximately 45° to the right of tunnel 1 and extends 350ft (106.7m), ending with another 24ft (7.31m)-diameter work room (WR-3). Blasting was the only practical way to construct the Tunnel Drain Collection System but the presence of PCBs in the work zone, rigid blasting limitations and public concern presented formidable challenges. Before starting excavation and contrary to typical shaft construction, the area was graded so that water would enter the shaft and not leave the site. Source

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