30 CFR Part 57Public Domain
§ 57.22230 — Weekly testing (II-A mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
(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.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.