30 CFR § 57.22240
Actions at 2.0 percent methane (V-A mines)
July 29, 2020
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percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from affected areas until methane is reduced to less than 1.0 percent.
[52 FR 24941, July 1, 1987; 52 FR 27903, July 24, 1987]
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