210 ILCS 145/45
The Department may, upon its own motion, and shall upon the verified complaint in writing of any person setting forth facts which if proven would constitute grounds for the denial of an application for a permit, or refusal to renew a permit, or revocation of a permit, or suspension of a permit, investigate the applicant or permit holder. The Department, after notice and opportunity for hearing, may deny any application for or suspend or revoke a permit or may refuse to renew a permit. Before denying an application, or refusing to renew a permit, suspending, or revoking a permit, the Department shall notify the applicant in writing. The notice shall specify the charges or reasons for the Department's contemplated action. The applicant or permit holder must request a hearing within 10 days of receipt of the notice. Failure to request a hearing within 10 days shall constitute a waiver of the right to a hearing.
210 ILCS 145/45