225 ILCS 745/90
The Department may investigate the actions of any applicant or of any person or persons rendering or offering to render geological services or any person holding or claiming to hold a license as a Licensed Professional Geologist. The Department shall, before revoking, suspending, placing on probation, reprimanding, or taking any other disciplinary action under Section 80 of this Act, at least 30 days before the date set for the hearing, (i) notify the accused in writing of the charges made and the time and place for the hearing on the charges, (ii) direct him or her to file a written answer to the charges with the Board under oath within 20 days after the service on him or her of the notice, and (iii) notify the accused that, if he or she fails to answer, default will be taken against him or her, and that his or her license may be suspended, revoked, placed on probationary status, or other disciplinary action taken with regard to the license, including limiting the scope, nature, or extent of his or her practice, as the Department may consider proper. At the time and place fixed in the notice, the Board shall proceed to hear the charges and the parties or their counsel shall be accorded ample opportunity to present any pertinent statements, testimony, evidence, and arguments. The Board may continue the hearing from time to time. In case the person, after receiving the notice, fails to file an answer, his or her license may, in the discretion of the Department, be suspended, revoked, placed on probationary status, or subject to any other disciplinary action the Department considers proper , including limiting the scope, nature, or extent of the person's practice or the imposition of a fine, without a hearing, if the act or acts charged constitute sufficient grounds for that action under this Act. The written notice may be served by personal delivery or by certified mail to the licensee's address of record.
225 ILCS 745/90