The Board shall give notice to all parties, prior to or at the hearing, of any facts of which it proposes to take official notice. Any party may request that official notice be taken of any fact qualified for notice by the statutes of this State. If official notice is taken, it shall be stated in the record, and all parties shall have opportunity to contest and give evidence in rebuttal or derogation of the official notice.
Okla. Admin. Code § 35:1-9-13