A carrier may file with the chair, not later than the 10th day prior to the date set for hearing, a withdrawal of objection on a form (A-3) prescribed by the chair for such purpose, in which event the chair will refund to the psychologist the $5 expense fee paid by him or her. If the parties to the dispute settle their differences within 10 days prior to the date set for hearing, notice of settlement on a form (A-4) prescribed by the chair for such purpose shall be signed by all parties and filed with the chair on or before the date set for the hearing. The parties to such a settlement shall each pay to the chair a minimum expense fee of $5 in the manner provided in section 332.8 of this Part.