The county board shall review any agricultural area created under this Act 10 years after the date of its creation and every 8 years thereafter. In conducting such review, the county board shall ask for the recommendations of the county committee, and shall, at least 120 days prior to such date, require the Agricultural Areas Committee to hold a public hearing at a place within the area or other readily accessible place upon notice being given in a newspaper having general circulation within the area or if there is no such newspaper, then in a newspaper having general circulation within the county, and individual notice in writing to the persons owning land within the area, and to the county or regional planning commission. The county board after receiving the reports of the county committee and after the public hearing, may terminate the area at the end of such 10 or 8 year periods by filing a notice of termination with the county clerk or the county board may modify the area in the same manner as is provided in Section 6 of this Act. If the county board does not act, the area shall continue as originally constituted. The county board shall notify the Department of Agriculture of any alterations to an agricultural area or the termination of an agricultural area within 45 days of taking such action.