Notice of the time and place for any hearing shall be given to any party concerned at least 30 days prior to the hearing date. If an attorney, through written communication, is known to represent any party to a hearing, then notice is to be given to that attorney. Notice sent to the last known address by U.S. Mail, registered or certified, addressed to all parties concerned or their attorneys, when applicable, is sufficient.
Ill. Admin. Code tit. 41, § 176.515