Cal. Pub. Contract Code § 20150.10
Notwithstanding the provisions of Section 20150.9, on any project which is less than seventy-five thousand dollars ($75,000), if, after the first invitation for bids, all bids are rejected, the county may, after reevaluating its cost estimates of the project, pass a resolution by a four-fifths vote of its board of supervisors declaring that the project can be performed more economically by county personnel, or that in its opinion a contract to perform the project can be negotiated with the original bidders at a lower price than that in any of the bids, or the materials or supplies furnished at a lower price in the open market. Upon adoption of the resolution, it may have the project done in the manner stated without further complying with this article.
Ca. Pub. Cont. Code § 20150.10