Cal. Pub. Contract Code § 20551
The commission shall, pursuant to an order entered in its minutes, advertise for bids for the construction of the boulevard, either as a whole or in sections as it may see fit, in accordance with the plan theretofore adopted and filed, by publishing a notice calling for bids at least once a week for two successive weeks in a weekly newspaper published within the district if there is such a newspaper published therein, otherwise in a newspaper published at the county seat of the county in which the district is located. The notice shall refer to the order and plan for further particulars. If the commission elects to receive separate bids for the construction of sections of the boulevard, the order shall describe the sections for which separate bids are desired.
The commission may advertise at the same time and in the same notice both for bids for the construction of the boulevard as a whole and for bids for the construction of separate sections.
Ca. Pub. Cont. Code § 20551