71.201—Sampling; general requirements.
(a)
Each operator shall take respirable dust samples of the concentration of respirable dust in the active workings of the mine as required by this part with a sampling device approved by the Secretary and the Secretary of Health and Human Services under part 74 (Coal Mine Dust Personal Sampler Units) of this title.
(b)
Sampling devices shall be worn or carried directly to and from the designated work position to be sampled and shall remain operational during the entire shift or for 8 hours, whichever time is less.
(c)
Upon request from the District Manager, the operator shall submit the date on which collecting any respirable dust samples required by this part will begin.
(d)
During the time for abatement fixed in a citation for violation of § 71.100 (Resipirable dust standard) or § 71.101 (Respirable dust standard when quartz is present), the operator shall take corrective action to lower the concentration of respirable dust to within the permissible concentration and then sample each normal work shift until five valid respirable dust samples are taken.
(e)
Upon written request by the operator, the District Manager may waive the rain restriction for a normal work shift as defined in § 71.2 (Definitions) for a period not to exceed two months, if the District Manager determines that:
(1)
The operator will not have reasonable opportunity to complete the respirable dust sampling required by this part without the waiver because of the frequency of rain; and
(2)
The operator did not have reasonable opportunity to complete the respirable dust sampling required by this part prior to requesting the waiver.