30 CFR Part 57Public Domain
§ 57.22231 — Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.
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.