Notwithstanding paragraphs (1) and (2) of this subsection, after
October 31, 1982, if the Administrator has not promulgated standards under section 275 a. of the Atomic Energy Act of 1954 [
42 U.S.C. 2022(a)] in final form by such date, remedial action taken by the Secretary under this subchapter shall comply with the standards proposed by the Administrator under such section 275 a. until such time as the Administrator promulgates the standards in final form.