(a) The Administrator shall, with the concurrence of the Director, render a decision on the application for permit revision and approve or disapprove the proposed revision in accordance with the applicable criteria set out in W.S. § 35-11-406 and any regulations adopted pursuant thereto. The decision shall be made:
(b) The applicant shall be promptly informed of the decision on the application.
020-13 Wyo. Code R. § 13-4