30 CFR § 71.301 - Respirable dust control plan; approval by District Manager and posting.
(b) MSHA may take respirable dust samples to determine whether the respirable dust control measures in the operator's plan effectively maintain concentrations of respirable coal mine dust at or below the applicable standard.
(d) The approved respirable dust control plan and any revisions shall be:
(1) Provided upon request to the representative of miners by the operator following notification of approval;
(2) Made available for inspection by the representative of miners; and
(3) Posted on the mine bulletin board within 1 working day following notification of approval, and shall remain posted for the period that the plan is in effect.