Cal. Pub. Cont. Code § 20488

The contract shall provide that the work shall be done strictly in accordance with the plans and specifications contained in the report provided for in Sections 10200, 10201, 10202, 10203, 10204, and 10300 of the Streets and Highways Code. The work shall be done under the supervision of the board officer, or person by whom the report was made, and no work or portion of the work shall be paid for until it is approved for payment by that board officer, or person, but this shall not prevent approval of and payment for completed portions of the work as it progresses. Payment made for completed portions of the work shall not constitute final acceptance of these portions or of the completed project.