Level Four A. If within ten (10) school days following the formal third step the Association submits a request to the Superintendent to enter into arbitration, the Superintendent and the Association shall attempt to agree upon a mutually acceptable arbitrator and shall obtain a commitment from said arbitrator to serve. If the parties are unable to agree upon an arbitrator or to obtain such a commitment within ten (10) school days, a written request for a list of arbitrators shall be made to the Public Employment Relations Board (PERB) by either party. The list shall consist of seven (7) potential arbitrators and the parties shall determine by lot which party shall have the right to remove the first name from the list. The party having the right to remove the first name shall do so within two (2) school days. Then the parties shall have one (1) school day alternately to remove until one (1) name remains. The person whose name remains shall be the arbitrator. B. The arbitrator so selected shall confer with the Superintendent and the Association and hold hearings promptly and shall issue his/her decision not later than fifteen (15) school days from the date of the close of the hearings, or, if oral hearings have been waived, then from the date the final statements and proofs on the issues are submitted to him/her. The arbitrator's decision shall be in writing and shall set forth his/her findings of fact, reasoning, and conclusions of the issues submitted. The arbitrator's decision shall have no power to alter, add to, or detract from the specific provisions of the Agreement. No decision of the arbitrator shall in any way be derogation of the powers, duties, and rights established in the Board by constitutional provisions, statue, ordinance, or special legislative acts. The decision of the arbitrator shall be submitted to the Superintendent and the Association and shall be final and binding on the parties. C. The costs of the services of the arbitrator will be borne equally by the Board and the Association. D. If the grievant files any claim or complaint in any forum other than under the grievance procedure of this Master Contract Agreement, then the school district shall not be required to process the same claim or set of facts through this grievance procedure.