(a) The mine atmosphere shall be tested for methane at least once every seven days by a competent person or an atmospheric monitoring system, or a combination of the two. Such testing shall be done at the following locations:
- (1) Active mining faces and benches;
- (2) Main returns;
- (3) Returns from idle workings;
- (4) Returns from abandoned workings; and
- (5) Seals.
- (b) Where such examinations disclose hazardous conditions, affected persons shall be informed and corrective action shall be taken.
- (c) Certification of examinations shall be made by signature and date. Certifications shall be kept for at least one year and made available to authorized representatives of the Secretary.
[52 FR 24941, July 1, 1987, as amended at 52 FR 41397, Oct. 27, 1987; 60 FR 33723, June 29, 1995]