requests additional information from a State regarding an exceptional event demonstration under clause (i), not later than 90 days after the submission of that additional information, the Administrator shall approve or disapprove the demonstration. (II) Administration If the Administrator does not approve or disapprove a demonstration for which additional information is submitted within the 90-day period described in subclause (I), the demonstration shall be considered to be approved. (E) Burden of proof The regulations promulgated under this section shall provide that— (i) a determination by the Administrator with respect to approval or disapproval of an exceptional event demonstration be based on a preponderance of the evidence