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Statement of Need: Current scientific data indicate that the existing asbestos PEL is not sufficiently protective of miners' health. MSHA's asbestos regulations date to 1967 and are based on the Bureau of Mines (MSHA's predecessor) standard of 5 mppcf (million particles per cubic foot of air). In 1969, the Bureau proposed a 2 mppcf and 12 fibers/ml standard. This standard was promulgated in 1969. In 1970, the Bureau proposed to lower the standard to 5 fibers/ml, which was promulgated in 1974. MSHA issued its current standard of 2 fibers/ml in 1976 for coal mining (41 FR 10223) and 1978 for metal and nonmetal mining (43 FR 54064). During inspections, MSHA routinely takes samples, which are analyzed for compliance with its standard. Other Federal agencies have addressed this issue by lowering their PEL for asbestos. For example, the Occupational Safety and Health Administration, working in conjunction with the Environmental Protection Agency, enacted a revised asbestos standard in 1994 that lowered the permissible exposure limit to an 8-hour time-weighted average limit of 0.1 fiber per cubic centimeter of air and the excursion limit to 1.0 fiber per cubic centimeter of air (1 f/cc) as averaged over a sampling period of thirty (30) minutes. These lowered limits reflected increased asbestos-related disease risk to asbestos-exposed workers.

Summary of the Legal Basis: Promulgation of this regulation is authorized by section 101 of the Federal Mine Safety and Health Act of 1977.

Alternatives: The Agency has increased sampling efforts in an attempt to determine current miners' exposure levels to asbestos, including taking samples at all existing vermiculite, taconite, talc, and other mines to determine whether asbestos is present and at what levels. In early 2000, MSHA began an intensive sampling effort at operations with potential asbestos exposure. These efforts continue. While sampling, MSHA staff discussed with miners and mine operators the potential hazards of asbestos and the types of preventive measures that could be implemented to reduce exposures. The course of action MSHA takes in addressing asbestos hazards to miners will, in part, be based on these sampling results.

Anticipated Costs and Benefits: MSHA will develop a preliminary regulatory economic analysis to accompany any proposed rule that may be developed.

Risks: Miners could be exposed to the hazards of asbestos during mine operations where the ore body contains asbestos. There is also potential for exposure at facilities in which installed asbestos-containing material is present. Overexposure to asbestos causes asbestosis, mesothelioma, and other forms of cancers.