CA Pub Cont Code Section 6823

(a)

For contracts for public works projects awarded prior January 1, 2012, a transportation entity authorized to use the design-build method of procurement shall establish and enforce a labor compliance program containing the requirements outlined in Section 1771.5 of the Labor Code or shall contract with a third party to operate a labor compliance program containing the requirements outlined in Section 1771.5 of the Labor Code. This requirement shall not apply to projects where the transportation entity or design-build entity has entered into any collective bargaining agreement that binds all of the contractors performing work on the projects.

(b)

For contracts for public works projects awarded on or after January 1, 2012, the project shall be subject to the requirements of Section 1771.4 of the Labor Code.