(1) The secretary shall approve or reject a plan in writing within thirty (30) days of its receipt.
(2) Only one (1) plan may be approved for any one (1) employer during any twelve (12) month period.
(3) The reason for the rejection of any plan shall be final and nonappealable, but an employer whose plan was rejected shall be allowed to submit another plan for approval not earlier than fifteen (15) days from the date of the last rejection.