70 ILCS 1832/120
Regular meetings of the Board shall be held at least once in each calendar month, the time and place of the meeting to be fixed by the Board. Four members of the Board shall constitute a quorum for the transaction of business. All action of the Board shall be by ordinance or resolution and the affirmative vote of at least 4 members shall be necessary for the adoption of any ordinance or resolution. All ordinances and resolutions before taking effect shall be approved by the chairperson of the Board. If the chairperson shall approve the ordinance or resolution, he or she shall sign it. Those ordinances or resolutions the chairperson shall not approve the chairperson shall return to the Board with his or her objections in writing at the next regular meeting of the Board occurring after the passage of the ordinances or resolutions. If the chairperson shall fail to return any ordinance or resolution with his or her objections by the time required in this Section, he or she shall be deemed to have approved it and it shall take effect accordingly. Upon the return of any ordinance or resolution by the chairperson with his or her objections, the vote by which the ordinance or resolution was passed shall be reconsidered by the Board. If upon reconsideration the ordinance or resolution is passed by the affirmative vote of at least 5 members, it shall go into effect notwithstanding the veto of the chairperson. All ordinances, resolutions, all proceedings of the district, and all documents and records in its possession shall be public records, and open to public inspection, except any documents and records that shall be kept or prepared by the Board for use in negotiations, actions, or proceedings to which the district is a party.
70 ILCS 1832/120