Within 60 days after January 1, 1990 (the effective date of Article 5 of Public Act 86-888), the President of the Village of Maywood shall appoint 3 members of the Board for initial terms expiring June 1, 1990; 2 members for initial terms expiring June 1, 1991; and 2 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.