The Agency shall promptly investigate each charge filed with it, which may include a mutual settlement agreement through mediation. If, after the investigation of the charge, the Executive Director, based on a preponderance of evidence, determines that no violation of this Division has occurred, the Director may dismiss the charge. Any complainant adversely affected by the dismissal may appeal administratively to the Commission, no later than fifteen (15) days after the date of dismissal by the Executive Director, who may take such action as s/he deems appropriate. In cases alleging discrimination in housing, at the end of each investigation, the Executive Director shall prepare a final investigative report containing: The names and dates of contacts with witnesses; A summary and the dates of correspondence and other contacts with the complainant and the respondent; A summary description of other pertinent records; A summary of witness statements; and Answers to interrogatories.