Wash. Rev. Code § 49.39.110
In addition to any other method for selecting arbitrators, the parties may request the commission to appoint a qualified person who may be an employee of the commission to act as an arbitrator to assist in the resolution of a labor dispute between the employer and the bargaining representative arising from the application of the matters contained in a collective bargaining agreement. The arbitrator must conduct the arbitration of the dispute in a manner as provided for in the collective bargaining agreement. The commission may not collect any fees or charges from the employer or the bargaining representative for services performed by the commission under this chapter. The provisions of chapter 49.08 RCW do not apply to this chapter.
RCW 49.39.110