§ 57.22233. Actions at 0.5 percent methane (I-C mines).
50 words·~1 min read·
/us/cfr/t30/s§ 57.22233·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
If methane reaches 0.5 percent in the mine atmosphere, ventilation changes shall be made to reduce the level of methane. Until methane is reduced to less than 0.5 percent, no other work shall be permitted in affected areas. \[52 FR 24941, July 1, 1987; 52 FR 27903, July 24, 1987\]