In Jefferson County, any county planning commission established under Act No. 344, H. 775, 1947 Regular Session (General Acts of 1947, p. 217) or Act No. 581, H. 1012, 1947 Regular Session (General Acts of 1947, p. 404) shall consist of 15 members; three designated and 12 appointed members. Within 60 days after October 2, 1986, the Jefferson County Commission shall divide the county into six districts with each district containing an approximately equal number of persons residing in unincorporated territory. Such division shall be based upon the most recent federal decennial census and redrawn after each new federal decennial census. After October 2, 1986, newly appointed or reappointed members of such commissions shall be appointed so that the county commission shall appoint two members from each district with one such member representing the unincorporated territory of the district so that at least 50 percent of the total 12 appointed members shall reside in and represent unincorporated territory. The designated members shall be: One an employee of the county designated by the county commission; one shall be the county engineer or the county highway engineer; one shall be an agent or employee of the county board of health designated by the board; the terms of such designated members shall correspond to their respective official tenures. The terms of appointed members shall be four years, except that the terms of nine of the members first appointed shall be three for one year, three for two years; and three for three years; with all such short first term appointees being eligible for reappointment at the expiration of such one, two, and three year terms. The designated members shall be agreed to and approved by the county commission, and all other members shall be appointed by the county commission. All members of the commission shall serve as such without compensation; and no appointed member shall hold any public elective office. The members of the commission shall be residents of the county. The county commission shall provide for the filling of any vacancy in the membership of the commission for the unexpired terms and for the removal of a member for nonperformance of duty or misconduct.