TUNNELS. A "Tunnel" shall be defined as a subterranean excavation, lined or unlined, which because of its length necessitates an employee or employees working underground for a distance of ten feet or more. On all work classified as "Tunnel, ' the tunnel classification and rates shall apply to the entire length of the tunnel, from portal to portal. A tunnel whose horizontal grade is over 30 percent and less than 60 percent shall be defined as a "Raise. " A tunnel, whose horizontal grade is greater than 60 percent, and whose depth is more than twice its largest horizontal dimension, shall be defined as a "Shaft.' The above definitions of work shall apply also to the work of timbering and lining of tunnels (raises and shafts) as described above.
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Sources: Labor Agreement, Labor Agreement, Labor Agreement