§ 57.22231. Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).
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/us/cfr/t30/s§ 57.22231·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.
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§ 57.22231
Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).
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