OAC Rule 15. Hearing Vacated. 

After a response to an application is filed, the application may not be withdrawn and the hearing may not be vacated except upon the agreement of all parties or upon the order of a judge.  If the parties agree to the withdrawal of the application the applicant must promptly notify the OAC of the agreement to vacate the hearing. Notification shall be made by letter, facsimile or telephone.