30 CFR § 845.20 - Final assessment and payment of penalty.
(a) If the person to whom a notice of violation or cessation order is issued fails to request a hearing as provided in § 845.19, the proposed assessment shall become a final order of the Secretary and the penalty assessed shall become due and payable upon expiration of the time allowed to request a hearing.
(b) If any party requests judicial review of a final order of the Secretary, the proposed penalty shall continue to be held in escrow until completion of the review. Otherwise, subject to paragraph (c) of this section, the escrowed funds shall be transferred to the Office in payment of the penalty, and the escrow shall end.
(c) If the final decision in the administrative and judicial review results in an order reducing or eliminating the proposed penalty assessed under this part, the Office shall within 30 days of receipt of the order refund to the person assessed all or part of the escrowed amount, with interest from the date of payment into escrow to the date of the refund at the rate of 6 percent or at the prevailing Department of the Treasury rate, whichever is greater.
(d) If the review results in an order increasing the penalty, the person to whom the notice or order was issued shall pay the difference to the Office within 15 days after the order is mailed to such person.