(a) Time and place of hearing established. Unless the parties agree to proceed without a hearing as provided in
§ 4221.5(c), the parties and the arbitrator shall, no later than 15 days after the written acceptance by the arbitrator is mailed to the parties, establish a date and place for the hearing. If agreement is not reached within the 15-day period, the arbitrator shall, within 10 additional days, choose a location and set a hearing date. The date set for the hearing may be no later than 50 days after the mailing date of the arbitrator's written acceptance.