California Code, Public Contract Code - PCC § 10740

(a) By publication for two consecutive insertions in a weekly trade paper of general circulation, published either in Los Angeles or San Francisco, devoted primarily to the dissemination of contract news among contracting firms;  and

(b) Once a week for two consecutive weeks in a newspaper of general circulation in the county in which the project is located, or, if located in more than one county in such a newspaper in a county in which a major portion of the work is to be done.