29 C.F.R. § 1905.13
(a) Modification or revocation.
(1) An affected employer or an affected employee may apply in writing to the Assistant Secretary of Labor for Occupational Safety and Health for a modification or revocation of a rule or order issued under section 6(b) (6) (A), 6(d), or 16 of the Act. The application shall contain:
(iv) If the applicant is an employer, a certification that the applicant has informed his affected employees of the application by:
(a) Giving a copy thereof to their authorized representative;
(b) Posting at the place or places where notices to employees are normally posted, a statement giving a summary of the application and specifying where a copy of the full application may be examined (or, in lieu of the summary, posting the application itself); and
(c) Other appropriate means.
(2) The Assistant Secretary may on his own motion proceed to modify or revoke a rule or order issued under section 6(b) (6) (A), 6(d), or 16 of the Act. In such event, the Assistant Secretary shall cause to be published in the Federal Register a notice of his intention, affording interested persons an opportunity to submit written data, views, or arguments regarding the proposal and informing the affected employer and employees of their right to request a hearing, and shall take such other action as may be appropriate to give actual notice to affected employees. Any request for a hearing shall include a short and plain statement of:
[36 FR 12290, June 30, 1971, as amended at 40 FR 25449, June 16, 1975]