29 C.F.R. § 2570.69

(a) The Secretary may review a decision of an administrative law judge. Such a review may occur only when a party files a notice of appeal from a decision of an administrative law judge within twenty (20) days of the issuance of such decision. In all other cases, the decision of the administrative law judge shall become final agency action within the meaning of 5 U.S.C. 704.

(b) A notice of appeal to the Secretary shall state with specificity the issue(s) in the decision of the administrative law judge on which the party is seeking review. Such notice of appeal must be served on all parties of record.

(c) Upon receipt of a notice of appeal, the Secretary shall request the Chief Administrative Law Judge to submit to him or her a copy of the entire record before the administrative law judge.