California Code, Code of Civil Procedure - CCP § 1299.9

(a) The provisions of this title shall not apply to any employer that is a city, county, or city and county, governed by a charter that was amended prior to January 1, 2004, to incorporate a procedure requiring the submission of all unresolved disputes relating to wages, hours, and other terms and conditions of employment within the scope of arbitration to an impartial and experienced neutral person or panel for final and binding determination, provided however that the charter amendment is not subsequently repealed or amended in a form that would no longer require the submission of all unresolved disputes relating to wages, hours, and other terms and conditions of employment within the scope of arbitration to an impartial and experienced neutral person or panel, for final and binding determination.

(b) Unless otherwise agreed to by the parties, the costs of the arbitration proceeding and the expenses of the arbitration panel, except those of the employer representative, shall be borne by the employee organization.