If no substantial objections are received and no hearing is requested within 30 days after publication of a proposed regulation it shall take effect on a date set by the Director. The effective date shall be at least 60 days after the time for filing objections has expired.
If timely substantial objections are made to a Federal regulation within 30 days after it is automatically adopted or to a proposed regulation within 30 days after it is published, the Director, after notice, shall conduct a public hearing to receive evidence on the issues raised by the objections. Any interested person or his representative may be heard. The Director shall act upon objections by order and shall mail the order to objectors by certified mail as soon after the hearing as practicable. The order shall be based on substantial evidence in the record of the hearing. If the order concerns a Federal regulation it may reinstate, rescind or modify it. If the order concerns a proposed regulation it may withdraw it or set an effective date for the regulation as published or as modified by the order. The effective date shall be at least 60 days after publication of the order.
430 ILCS 40/5