The following actions are required to detect and respond to excess methane. Subsections (a) through (f) of this section pertain to methane testing with hand-held devices:
(a) Hand-held testing required. — In any mine, no electrical equipment or permissible diesel-powered equipment may be brought in by the last open crosscut until a qualified person tests for methane. If one percent or more methane is present, the equipment may not be taken into the area until the methane concentration is reduced to less than one percent. Thereafter, subsequent methane examinations shall be made at least every twenty minutes while any electrical or diesel-powered equipment is present and energized.
(b) Location of tests. –- Tests for methane concentrations under this section shall be made at least twelve inches from the roof, face, ribs and floor.
(c) Working places and intake air courses. —
(1) When one percent or more methane is present in a working place or an intake air course, including an air course in which a belt conveyor is located or in an area where mechanized mining equipment is being installed or removed: