Cal. Ed. Code § 17424
The governing board of the school district shall obtain the general prevailing rate of per diem wages from the Director of the Department of Industrial Relations for each craft, classification or type of workman needed for the construction of the building and shall specify in the resolution and in the notice, required by Section 17417, or in the resolution required by Section 17418 and in the lease or agreement made pursuant to this article, what the general prevailing rate of per diem wages and the general prevailing rate for holiday and overtime work in the locality is for each craft, classification or type of workmen needed for the construction of the building. The holidays upon which such rate shall be paid need not be specified by the governing board, but shall be all holidays recognized in the collective bargaining agreement applicable to the particular craft, classification or type of workmen employed on the project.
Any agreement or lease entered into pursuant to this article shall require that such general prevailing rates will be paid. It shall also require that work performed by any workman employed upon the project in excess of eight hours during any one calendar day shall be permitted only upon compensation for all hours worked in excess of eight hours per day at not less than 11/2 times the basic rate of pay. There may also be included in leases or agreements entered into pursuant to this article any other requirements with respect to matters related to the subject of this section which the governing board deems necessary or desirable.
Ca. Educ. Code § 17424