30 C.F.R. § 77.201 Methane content in surface installations.
Title 30 - Mineral Resources
The methane content in the air of any structure, enclosure or other facility shall be less than 1.0 volume per centum.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart C—Surface Installations
§ 77.201 Methane content in surface installations.
