Declares that the following are confidential and privileged and not subject to public disclosure under chapter 42.56 RCW: (1) Records of mediation communications conducted under the provisions of chapters 28B.52, 41.56, 41.59, 41.76, and 41.80 RCW; and

(2) Evidence furnished as showing of interest in support of any representation petition or motion for intervention filed under chapters 28B.52, 41.56, 41.59, 41.76, and 41.80 RCW.