29 C.F.R. § 530.412
In lieu of an administrative hearing before an Administrative Law Judge under the above procedures, an applicant or certificate holder who does not dispute the factual findings of the Administrator may, within 30 days of the date of issuance of the notice of denial, revocation, or assessment (or within 20 days in the case of a notice of emergency revocation) petition the Administrator instead to reconsider the denial or revocation of the certificate or the assessment of civil money penalties. An applicant or certificate holder electing this informal procedure may appear before the Administrator in person, make a written submission to the Administrator, or both. Such reconsideration by the Administrator shall be available only upon waiver by the applicant or certificate holder of the formal hearing procedures provided by the above regulations.
29 C.F.R. §530.412