(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
each part 90 miner's position, and shall remain
operational during the entire shift or for 8 hours, whichever time is
(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 §90.100 (Respirable dust standard) or
§90.101 (Respirable dust standard when quartz is
present), the operator shall take corrective action and then sample the
affected part 90 miner until five valid respirable dust
samples are taken.
(e) The respirable dust samples required by this part shall be
collected while the part 90 miner is performing normal
(f) Unless otherwise directed by the District Manager, the respirable
dust samples required under this part shall be taken by placing the sampling
device as follows: