C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER O—COAL MINE SAFETY AND HEALTH › PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES › Subpart C—Surface Installations

30 C.F.R. § 77.201

Methane content in surface installations

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The methane content in the air of any structure, enclosure or other facility shall be less than 1.0 volume per centum.