CFR › Title 40 › Part 66 › §66.5340 CFR §66.53Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkWithin thirty days after receiving a petition for reconsideration under § 66.52 the Administrator shall:(a)Accept the penalty calculation of the owner or operator to the extent the Administrator concludes it is correct; or(b)Grant a hearing to the extent he does not conclude that the petition is correct.