MSHA - Code of Federal Regulations - 30 CFR 57.22239
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MSHA - Title 30 CFR
30 CFR § 57.22239
Actions at 2.0 percent methane (IV mines).


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percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from the mine until methane is reduced to less than 0.5 percent. MSHA shall be notified immediately.


[52 FR, 24941, July 1, 1987, as amended at 52 FR 41397, Oct. 27, 1987; 60 FR 33719, June 29, 1995]