by an agency before the date of the enactment of this Act, such plan shall provide for the periodic review of such rule before the expiration of the 10-year period beginning on the date of the enactment of this Act. For any such rule, the head of the agency may provide for a 1-year extension of such period if the head of the agency, before the expiration of the period, certifies in a statement published in the Federal Register that reviewing such rule before the expiration of the period is not feasible. The head of the agency may provide for additional 1-year extensions of the period pursuant to the preceding sentence, but in no event may the period exceed 15 years. (c) Congressional review Section 801(a)(1)(B) of title 5, United States Code, is amended— (1) by redesignating clauses (iii) and (iv) as clauses (iv) and (v), respectively