After the expiration of the 30 days after the date of the first publication of the Director’s notice above referred to, the Director of Finance shall report to the City Council the total amount of the assessments due on the whole improvement, the total amount of the assessment paid to him during the 30 days, and the total amount of the assessment unpaid, whereupon the City Council shall issue the bonds on the local improvement district established by the ordinance providing for such improvement, and in an amount equal to the amount remaining unpaid on such assessment roll, but such bonds shall not be issued prior to 20 days after the expiration of the 30 days. [Code 1970 § 14.04.060; Code 1954 § 2-12.24.]