MSHA - Code of Federal Regulations - 30 CFR 57.5061
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MSHA - Title 30 CFR
30 CFR § 57.5061 Compliance determinations.

     (a) MSHA will use a single sample collected and analyzed by the Secretary in accordance with the requirements of this section as an adequate basis for a determination of noncompliance with the DPM limit.

     (b) The Secretary will collect samples of DPM by using a respirable dust sampler equipped with a submicrometer impactor and analyze the samples for the amount of elemental carbon using the method described in NIOSH Analytical Method 5040, except that the Secretary also may use any methods of collection and analysis subsequently determined by NIOSH to provide equal or improved accuracy for the measurement of DPM.

     (c) The Secretary will use full-shift personal sampling for compliance determinations.