30 C.F.R. § 57.22238 Actions at 2.0 percent methane (I-B, II-B, V-B, and VI mines).
Title 30 - Mineral Resources
If methane reaches 2.0 percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from the mine until methane is reduced to less than 0.5 percent.
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
§ 57.22238 Actions at 2.0 percent methane (I-B, II-B, V-B, and VI mines).
