Grounds for challenge and removal. In accordance with The Arbitration Law, an arbitrator shall be removed from the case, and either party may challenge an arbitrator, if the arbitrator:
(1) is a party to the case or a close relative of either party or either party's representative;
(2) has an interest in the case;
(3) is otherwise related to either party or either party's representative, which may affect the impartiality of the arbitration; or
(4) has privately met with or accepted any hospitality or gift from either party or either party's representative.
The party who intends to challenge an arbitrator must submit a written challenge stating the facts and reasons on which the challenge is based, accompanied by supporting documents and other evidence, where necessary.