(a) The operator shall take five valid representative dust samples for each part 90 miner within 15 calendar days after:

(1) The 20-day period specified for each part 90 miner in § 90.100; and

(2) Implementing any transfer after the 20th calendar day following receipt of notification from MSHA that a part 90 miner is employed at the mine.

(b) Noncompliance with the standard shall be determined in accordance with § 90.207(d).

(c) Upon issuance of a citation for a violation of the standard, the operator shall comply with § 90.207(f).