30 CFR § 90.220
Status change reports.
If there is a change in the status of a part 90
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