California Code, Government Code - GOV § 19843

(a) For each class or position for which a monthly or annual salary range is established by the department, the department shall establish and adjust workweek groups and shall assign each class or position to a workweek group. The department, after considering the needs of the state service and prevailing overtime compensation practices, may establish workweek groups of different lengths or of the same length but requiring different methods of recognizing or providing compensation for overtime. The department may also provide for the payment of overtime in designated classes for work performed after the normal scheduled workday or normal scheduled workweek.

(b) If the provisions of this section are in conflict with the provisions of a memorandum of understanding reached pursuant to Section 3517.5, the memorandum of understanding shall be controlling without further legislative action, except that if such provisions of a memorandum of understanding require the expenditure of funds, the provisions shall not become effective unless approved by the Legislature in the annual Budget Act.