§57.22234. Actions at 1.0 percent methane (I-A, I-B, III, V-A, and V-B mines).
30 C.F.R. § 57.22234
If methane reaches 1.0 percent in the mine atmosphere, ventilation changes shall be made to reduce the methane. Until such changes are achieved—
All persons other than competent persons necessary to make the ventilation changes shall be withdrawn from affected areas;
Electrical power shall be deenergized in affected areas, except power to monitoring equipment determined by MSHA to be intrinsically safe under 30 CFR part 18; and
Diesel equipment shall be shut off or immediately removed from the area.
If methane reaches 1.0 percent at a main exhaust fan, electrical power underground shall be deenergized, except power to monitoring equipment determined by MSHA to be intrinsically safe under 30 CFR part 18, and all persons shall be withdrawn from the mine.
If methane reaches 1.0 percent at a work place and there has been a failure of the main ventilation system, all persons shall be withdrawn from the mine.
Notes, amendments, and revision history
Amendments
[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]
Authority
Authority: 30 U.S.C. 811.
Source
Source: 52 FR 24941, July 1, 1987, unless otherwise noted.
Authority
Authority: 30 U.S.C. 811.
Source
Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.
Amendments
[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]