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CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER O—COAL MINE SAFETY AND HEALTH (parts 70 to 90) > PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES > SUBPART C—Surface Installations (§77.200 to §77.217) > 77.201—Methane content in surface installations.
77.201—Methane content in surface installations.
The methane content in the air of any structure, enclosure or other facility shall be less than 1.0 volume per centum.