; and (B) areas of high marine mammal primary productivity with year-round or seasonal aggregations of marine mammals to which this section applies. (c) Deadline for regulations Not later than 24 months after the date of enactment of this Act, the Administrator shall designate such areas and issue such regulations as are necessary to carry out this section and to designate areas of importance pursuant to this section, consistent with notice and comment requirements under chapter 5 of title 5, United States Code. (d) Modifying or designating new areas of importance (1) The Administrator shall issue regulations to modify or designate the areas of importance under this section within 180 days after the issuance of regulations to establish or to modify critical habitat for strategic stocks of marine mammals pursuant to the Endangered Species Act of 1973 ( 16 U.S.C. 1531 et seq.). (2) The Administrator shall reexamine the areas of importance designated under this section every five years following the initial issuance of the regulations to determine if the best available scientific information warrants modification or designation of areas of importance, and shall publish any revisions in the Federal Register after notice and opportunity for public comment. (3) Within 90 days after receiving the petition of an interested person under 553(e) of title 5, United States Code, to designate, modify, or add an area of importance under this section, the Administrator shall make a finding as to whether the petition presents substantial scientific information indicating that the petitioned action may be warranted. The Administrator shall promptly publish such finding in the Federal Register for comment. Within 180 days after the close of comments, the Administrator shall publish in the Federal Register a finding of whether the petitioned action is warranted and, if the Administrator determines that the petitioned action is warranted, shall publish draft regulations designating the area of importance and any relevant technical