On June 19, 1992, and for three months thereafter and for the last three months of the year 1994 and every third year thereafter, the governing body of a county may apply to the department to request that the county be placed with another regional grouping or, if necessary, in a new regional grouping. After public notice and comment and within no more than ninety days after the completed application has been submitted, the department shall authorize any such change if the county clearly and convincingly demonstrates that the change is necessary for effective solid waste management within the county and will not negatively affect the solid waste management system of either region. The procedure for establishing solid waste management regions set forth in section 260.300 shall take priority over and be followed in exclusion to the rulemaking procedure set forth in chapter 536 and section 260.225.