Arbitrations held pursuant to this article shall be heard by one (1) arbitrator from a three-person panel that will be mutually agreed upon by the Employer and the Association no later than thirty (30) days after ratification of the Agreement. Arbitrators will be selected on a rotating basis. If an arbitrator is provided notice and the case does not go to hearing for any reason, the assigned arbitrator will go to the bottom of the list just as though they had heard the case.