MSHA - Code of Federal Regulations - 30 CFR 57.22231
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MSHA - Title 30 CFR
30 CFR § 57.22231
Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines)
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If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.