Section 7975.
7975. A “kill” button capable of cutting off all electrical equipment shall be maintained in any gassy tunnel or underground mine. The safety representative or his designated representative shall cut off power at any time gas or vapor levels reach 20 percent of the lower explosive limit or more. Before work is restarted every employee […]
Section 7976.
7976. In any tunnel or underground mine classified as gassy, the division shall determine the number of fire extinguishers necessary and their locations. (Added by Stats. 1972, Ch. 1430.)
Section 7977.
7977. Any tunnel or underground mine classified as extrahazardous by the division shall comply with the provisions for gassy tunnels in this chapter, as well as regulations, rules, special orders, and general orders of the division or board. (Added by Stats. 1972, Ch. 1430.)
Section 7978.
7978. In any extrahazardous tunnel or underground mine smoking by employees or open flame shall be prohibited. Welding or cutting with arc or flame underground in other than fresh air shall be done under the direct supervision of qualified persons who shall test for gas and vapors before welding or cutting starts and continuously during […]
Section 7979.
7979. In tunnels or underground mines classified extrahazardous, sufficient air shall be supplied to maintain an atmosphere of all of the following conditions: (a) Not less than 19 percent oxygen. (b) Not more than 0.5 percent carbon dioxide. (c) Not more than 5 parts per million nitrogen dioxide. (d) No petroleum vapors or other toxic gases in concentrations exceeding […]
Section 7980.
7980. All electrical equipment and machines, including diesel engines, used in tunnels or underground mines classified extrahazardous shall be permissible equipment. The division may, however, permit the use of nonpermissive equipment in a tunnel or underground mine in areas where it finds there is no longer danger from gas or other hazards. (Added by Stats. […]
Section 7981.
7981. An escape chamber or alternate escape route shall be maintained within 5,000 feet of the tunnel face or areas being used to excavate material in an underground mine classified as gassy or extrahazardous. Workers shall be provided with emergency rescue equipment and trained in its use. (Added by Stats. 1972, Ch. 1430.)
Section 7982.
7982. Records of air flow and air sample tests to assure compliance with required standards shall be maintained by the employer at the site of any tunnel or underground mine classified extrahazardous. Such records shall be made available to any division representative upon request. (Added by Stats. 1972, Ch. 1430.)
Section 7983.
7983. The main fan line used for ventilation in any tunnel or underground mine classified extrahazardous shall contain a cutoff switch capable of halting all machinery underground automatically should the fan fail or its performance fall below minimum power needed to maintain a safe atmosphere. (Added by Stats. 1972, Ch. 1430.)
Section 7984.
7984. In any tunnel or underground mine classified extrahazardous a device or devices which automatically and continuously test the atmosphere for gases or vapors shall be maintained. Such device or devices shall be placed as near the face or area of operation as practical, but never more than 50 feet from such point. The division […]