California Code, Public Contract Code - PCC § 20164

The notice inviting bids shall set a date for the opening of bids. The first publication or posting of the notice shall be at least 10 days before the date of opening the bids. Notice shall be published at least twice, not less than five days apart, in a newspaper of general circulation, printed and published in the city, or if there is none, it shall be posted in at least three public places in the city that have been designated by ordinance as the places for posting public notices. The notice shall distinctly state the project to be done.