If the level of gas in any tunnel or underground mine reaches 20 percent of its lower explosive limit at any time all men shall be removed, the division notified immediately by telephone or telegram, and no one shall reenter the tunnel or underground mine until approval is given by the division.

(Added by Stats. 1972, Ch. 1430.)

Terms Used In California Labor Code 7972

  • Division: means the Division of Occupational Safety and Health. See California Labor Code 7951
  • Lower explosive limit: means the lowest concentration at which a gas or vapor can be ignited or will explode. See California Labor Code 7951
  • Mine: means any excavation or opening above or below ground used for removal of ore, minerals, gravel, sand, rock, or other materials intended for manufacturing or sale. See California Labor Code 7951
  • Tunnel: means an underground passageway, excavated by men and equipment working below the earth's surface, that provides a subterranean route along which men, equipment, or substances can move. See California Labor Code 7951
  • Underground mine: means a mine that consists of a subterranean excavation. See California Labor Code 7951
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