Cal. Public Utilities Code § 98167

(a) The obligation of the district is to bargain in good faith with a duly designated or certified labor organization and, when an agreement is reached, to execute a written collective bargaining agreement with the labor organization covering the wages, hours, and working conditions of the employees represented by the labor organization in an appropriate unit, and, thereafter, to comply with the terms of the agreement. (b) The obligation of the district to bargain collectively extends to all subjects of collective bargaining concerning wages, hours, working conditions, and other conditions of employment. (c) This section supersedes Chapter 10 (commencing with Section 3500) of Division 4 of Title 1 of the Government Code if there is any conflict between this section and that chapter, but in all other situations that chapter governs. (d) The district shall give reasonable written notice to an exclusive representative of its intent to make any change to matters within the scope of representation of the employees represented by the exclusive representative for purposes of providing the exclusive representative a reasonable amount of time to negotiate with the district regarding the proposed changes.