Cal. Gov. Code § 54516.2
The local agency shall let contracts made by it pursuant to Section 54516.1 to the lowest qualified responsible bidder after the publication of a notice inviting bids two or more times, not less than five days apart, in a newspaper of general circulation printed and published in the city. If there is no newspaper of general circulation printed or published in the city, copies of the notice shall be posted in at least three public places in the city. Publication shall be commenced or notice posted not less than 15 days prior to the date set in the notice for the opening of bids.
The notice inviting bids shall distinctly and specifically describe the enterprise involved and the period of time for which the enterprise is to be operated or managed.
If no bid which the local agency finds to be reasonable and valid is received upon the original advertising, the local agency need not readvertise.
Ca. Gov. Code § 54516.2