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The construction of underground tunnels, shafts, chambers, and passageways are essential yet dangerous activities. Working under reduced light conditions, difficult or limited access and egress, with the potential for exposure to air contaminants and the hazards of fire and explosion, underground construction workers face many dangers.
Underground construction applies to the construction of underground tunnels, shafts, chambers, and passageways. it also applies to cut-and-cover excavations which are both
This section does not apply to the following:
In general, the standard requires covered employers to: