Cal. Pub. Contract Code § 21020.9
The plans and specifications for any work proposed to be done, or improvements to be made, under the act, in any municipality in the district shall first be approved by the legislative body of the municipality before the commencement of the work or improvements, and before any contract shall be let therefor; provided, that in the event the legislative body shall refuse or neglect to approve the plans and specifications for the work or improvement within 30 days after being requested by the board of supervisors so to do, then the board of supervisors shall omit the doing of the work or making of the improvements within the municipality, and the omission shall not affect the validity of its proceedings under the act, and the funds which were to be expended for the proposed work or improvement in the municipality may be expended elsewhere by the board of supervisors for carrying out the purposes of the act.
Ca. Pub. Cont. Code § 21020.9