Code of Federal Regulations · Section

§ 57.22231 — Actions At 0.25 Percent Methane (i-b, Ii-b, V-b, And VI Mines)

30 C.F.R. § 57.22231

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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.

30 C.F.R. § 57.22230 30 C.F.R. § 57.22232

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