29 C.F.R. § 2570.12

(a) Upon receipt of a notice of appeal, the Secretary shall establish a briefing schedule which shall be served on all parties of record. Upon motion of one or more of the parties, the Secretary may, in his discretion, permit the submission of reply briefs.

(b) The Secretary shall issue a decision as promptly as possible after receipt of the briefs of the parties. The Secretary may affirm, modify, or set aside, in whole or in part, the decision on appeal and shall issue a statement of reasons and bases for the action(s) taken. Such decision by the Secretary shall be final agency action within the meaning of 5 U.S.C. 704.