Within 60 days after September 11, 1989 (the effective date of Article 2 of Public Act 86-907), the mayor of Carbondale, with the advice and consent of the city council, shall appoint 3 members of the Board for initial terms expiring June 1, 1990; 3 members for initial terms expiring June 1, 1991; and 3 members for initial terms expiring June 1, 1992. The successors of the initial members shall be appointed in like manner for 3 year terms from the date of appointment, except in case of an appointment to fill a vacancy.
70 ILCS 200/40-20