California Code, Public Contract Code - PCC § 20511

At any time after the installment assessment becomes delinquent, the superintendent of streets may call for bids for such improvement and may fix a date, not less than 20 nor more than 30 days after the publication of a notice inviting bids for such improvement, for the receipt of such bids at his office at an hour not later than 10 a.m. on such date.  Such notice shall be published once in a daily or weekly newspaper published and circulated in the city and designated by the city council for that purpose.