The college official who acts as hearing officer shall issue a written decision which shall include a brief statement of the reasons for the decision and a notice that judicial review may be available. All documents presented, considered or prepared by the hearing officer shall be maintained as the official record of the brief administrative proceeding. A decision must be promptly rendered after the conclusion of the brief adjudicative hearing and in no event later than 20 days after the request for hearing is received by the dean of students.