MSHA - Code of Federal Regulations - 30 CFR 90.220
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MSHA - Title 30 CFR
30 CFR § 90.220
Status change reports.

If there is a change in the status of a part 90 miner that affects the respirable dust sampling requirements of this part (such as entering a terminated, injured or ill status, or returning to work), the operator shall report the change in the status of the part 90 miner to the MSHA District Office or to any other MSHA office designated by the District Manager. Status changes shall be reported in writing within 3 working days after the status change has occurred.

Subpart D--Respirable Dust Control Plans