(a) The parties may agree to mediate a claim through an impartial third party. The mediation is subject to the provisions of the Governmental Dispute Resolution Act, Government Code, Chapter 2009. For purposes of this subchapter, "mediation" is assigned the meaning set forth in the Civil Practice and Remedies Code §154.023.(b) Mediation is a consensual process in which an impartial third party, the mediator, facilitates communication between the parties to promote reconciliation, settlement, or understanding among them. A mediator may not impose his or her own judgment on the issues for that of the parties. The mediator must be acceptable to both parties.