Within 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.
40 C.F.R. §66.53
45 FR 50110, July 20, 1980, as amended at 50 FR 36734, Sept. 9, 1985