92 Ill. Adm. Code 450.370
Filing
Section 450
Section 450.370 Filing
Two (2) copies of a Petition for
Intervention shall be filed with the Director and one (1) copy served on each
party not later than forty-eight (48) hours prior to the date set for hearing
of the matters set forth in the complaint. The hearing officer may permit a
later intervention when there is good cause for the delay.