1977—Subsec. (a). Pub. L. 95–164 substituted provisions under which the Secretary must notify the operator of the civil penalty he proposes to assess following the issuance of a citation or order and the operator must give notice that he will contest the citation or proposed assessment for provisions under which an operator was required to apply for review of an order issued under section 814 of this title and under which an investigation was made, hearings held, and information presented.

Subsec. (b). Pub. L. 95–164 substituted provisions relating to the steps to be taken following the failure of the operator to correct violations, including provisions relating to temporary relief formerly contained in subsec. (d), for provisions requiring the Secretary to make findings of fact and to issue a written decision upon receiving the report of an investigation.

Subsec. (c). Pub. L. 95–164 added subsec. (c). Former subsec. (c), directing the Secretary to take action under this section as promptly as possible, was incorporated into a part of par. (3).

Subsec. (d). Pub. L. 95–164 added subsec. (d). Former subsec. (d) redesignated (b)(2).

Amendment by Pub. L. 95–164 effective 120 days after Nov. 9, 1977, except as otherwise provided, see section 307 of Pub. L. 95–164, set out as a note under section 801 of this title.