(a) If, following the conference or review of submitted materials described in § 669.15, the Administrator concludes that the state is in compliance, the Administrator shall issue a decision which is the final decision, and the matter shall be concluded.

(b) If, following the conference or review of information submitted under § 669.15, the Administrator, with the concurrence of the Secretary, concludes that the state is in noncompliance, the Administrator shall issue a decision, which is the final decision, and the matter be concluded. The decision will be served on the Governor, or his/her designee.