Without limiting the discretionary powers of the hearing officer to notice other matters or documents which are properly the subject of official notice, the following matters may be officially noticed in all proceedings under the provisions of this chapter:
All parties to a proceeding shall be notified either before or during the hearing, of any matters noticed, and they shall be afforded an opportunity to contest the material so noticed.
Where the decision of the hearing officer rests on the official notice of a matter not appearing in the evidence in the record, any party shall, upon filing a motion within ten (10) days after thereof be afforded a reasonable opportunity to offer evidence to the contrary.
D.C. Mun. Regs. tit. 22, r. 22-B1105