(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 mechanized mining unit or designated area to be sampled and shall be
operated portal to portal. Sampling devices 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 §70.100 (Respirable dust standards) or
§70.101 (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 production shift until five valid respirable dust samples