30 C.F.R. § 57.22235 Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines).
Title 30 - Mineral Resources
(a) If methane reaches 1.0 percent in the mine atmoshpere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from affected areas until methane is reduced to less than 0.5 percent. (b) 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reaches 1.0 percent at a work place and there has been a failure of the main ventilation system, all persons shall be withdrawn from the mine.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
Ventilation
§ 57.22235 Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines).
