For 502(c)(2) civil penalty proceedings, this section shall apply in
lieu of Sec. 18.5 (a) and (b) of this title. Failure of the respondent
to file an answer to the notice of determination described in
Sec. 2560.502c-2(g) within the 30-day period provided by Sec. 2560.502c-
2(h) shall be deemed to constitute a waiver of his or her right to
appear and contest the allegations of the notice of determination, and
such failure shall be deemed to be an admission of the facts as alleged
in the notice for purposes of any proceeding involving the assessment of
a civil penalty under section 502(c)(2). Such notice shall then become
the final order of the Secretary.