Section 7985.
7985. All such testing device or devices shall be U.S. Bureau of Mines approved or acceptable to other authorities recognized by the division and shall automatically sound an alarm and activate flashing red signals visible to employees underground whenever the concentration of gases or vapors reaches or exceeds permissible levels. Permissible levels may be established […]
Section 7970.
7970. In any tunnel or underground mine classified gassy, smoking shall be prohibited and the employer shall be responsible for collecting all personal sources of ignition such as lighters and matches from employees entering the tunnel. (Added by Stats. 1972, Ch. 1430.)
Section 7971.
7971. Whenever there is any ignition of gas or vapor in a tunnel or underground mine, all work shall cease, employees shall be removed, and reentry except for rescue purposes shall be prohibited until the division has conducted an inspection and authorized reentry for maintenance or production in writing. (Added by Stats. 1972, Ch. 1430.)
Section 7972.
7972. 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 […]
Section 7973.
7973. In any tunnel or underground mine classified as gassy, all employees shall be informed of any special orders made by the division following an inspection. Such notice shall be given before entering the tunnel or underground mine. A copy of any orders subsequently written by the division shall be posted and all employees shall […]
Section 7974.
7974. In any tunnel classified as gassy by the division, ventilation shall include continuous exhausting of fumes and air, unless an alternative ventilation plan which is as effective or better is approved by the division. Fans for this purpose shall be located at the surface, and shall be reversible from a single switch at the […]
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 […]