(a) An operational, approved, shared work plan may be modified by the employer with the acquiescence of employee representatives if the modification is not substantial and is in conformity with the plan approved by the Director of the Division of Workforce Services, but the modifications must be reported promptly to the director.
(b)
(1) If the hours of work are increased or decreased substantially beyond the level in the original plan or if any other conditions are changed substantially, the director shall approve or disapprove the modifications without changing the expiration date of the original plan.
(2) If the substantial modifications do not meet the requirements for approval, the director shall disallow that portion of the plan in writing as specified in § 11-10-607.