(a) If you plan to close your municipal waste combustion unit rather than comply with the state plan, you must submit a closure notification, including the date of closure, to the executive director by the date your final control plan is due.(b) If the closure date is later than 1 year after the effective date of state plan approval, you must enter into a legally binding closure agreement with the executive director by the date your final control plan is due. The agreement must specify the date by which operation will cease.