(a) Any amendment to a certified local program that relates to the minimum standards of section 505.17 of this Part must be in conformance with such minimum standards and is subject to certification by the commissioner.

(b) Local governments must notify the commissioner in writing of all proposed amendments to certified local programs before they may be adopted. Within 15 days after receipt of such written notification, the commissioner will advise a local government whether such amendment is subject to his approval, and if so, whether such amendment conforms to the minimum standards of section 505.17 of this Part.

(c) Once a local government receives written notification from the commissioner that the proposed amendment conforms to the requisite minimum standards, it may submit such proposed amendment to the commissioner for certification. Included with the submission must be documentation evidencing that the amendment was subject to public notice and review as required by the local government. The commissioner will either certify or disapprove the amendment within 30 working days of its receipt. If the commissioner disapproves an amendment, he will notify the local government in writing of the reasons for disapproval and the modification that is necessary for certification. The commissioner will issue findings as part of his decision to either certify or disapprove a proposed amendment.