(a) Upon receipt of a petition for modification, the Mine Safety and
Health Administration shall cause an investigation to be made as to the
merits of the petition. Any party may request that the investigation of the
petition for modification be expedited, or that the time period for
investigating the petition be extended. Such requests shall be granted in
the discretion of the Administrator upon good cause shown.
(b) As soon as is practicable after the investigation is completed,
the appropriate Administrator shall make a proposed decision and order, which
shall be served upon all parties to the proceeding. The proposed decision
shall become final upon the 30th day after service thereof, unless a request
for hearing has been filed with the appropriate Administrator, as provided in
§44.14 of this part.
(c) Service of the proposed decision is complete upon mailing.