§57.22220. Air passing unsealed areas (I-A, II-A, III, and V-A mines).

30 C.F.R. § 57.22220

Air that has passed by or through unsealed abandoned or unsealed inactive areas and contains 0.25 percent or more methane shall—

(a)

Be coursed directly to a return airway;

(b)

Be tested daily for methane by a competent person; and

(c)

Not be used to ventilate work places.

Notes, amendments, and revision history

Authority: 30 U.S.C. 811.

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

Authority: 30 U.S.C. 811.

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.