(a) The Petitioner and Respondent may select an Arbitrator by agreement.

(b) If the Petitioner and Respondent do not agree upon an Arbitrator, the Office of Administrative Hearings shall promptly prepare a list of twenty potential Arbitrators selected at random from those who have indicated a willingness to serve as an Arbitrator in the location for the hearing. Within ten days from the mailing, the Petitioner and Respondent each may cross off the names of not more than ten to which it objects, numbering the remaining names in the order of preference and return the list to the Office of Administrative Hearings with a copy to the other. If either the Petitioner or Respondent does not return the list within the time specified or does not indicate an order of preference, all persons named therein shall be deemed equally acceptable. The Office of Administrative Hearings shall appoint the Arbitrator from among the persons whose names remain in accordance with the designated order of mutual preference. The disclosure and challenge procedure in Section 1323 shall apply. If for any reason the appointment cannot be made from the submitted list, the Office of Administrative Hearings shall repeat the process until an Arbitrator is selected.