Okla. Admin. Code § 460:2-7-7
(a) In a civil penalty proceeding where the person against whom the proposed civil penalty is assessed fails to comply on time with any prehearing order of a hearing examiner, the hearing examiner shall issue an order to show cause why:
(c) Where the person against whom the proposed civil penalty is assessed fails to appear at a hearing, that person will be deemed to have waived his right to a hearing and the hearing examiner may assume for purposes of the assessment: