Sec. 9. The agency shall determine if the alleged violator has substantially corrected the violation and notify the alleged violator whether the alleged violator is in substantial compliance with the applicable rule or state statute not more than thirty (30) days after the earlier of the date that:
(1) the alleged violation must be corrected under the corrective plan; or
(2) the alleged violator notifies the agency that the alleged violator has corrected the violation.