The mayor shall, between the first Monday of October and not less than 60 days before the beginning of the next fiscal biennium, file with the city clerk and immediately forward to the city council a preliminary budget together with a budget message in accordance with RCW 35A.34.080. The mayor shall prepare and deliver to the city council inserts or such other documentation as necessary to explain and show in detail the mayor’s recommendations contained in the preliminary budget. The preliminary budget shall be certified by both the mayor and the finance director that all changes, amendments or other revisions known to them, or known to each department, are contained within the preliminary budget as filed. (Ord. 3149 § 2 (Exh. A), 2015)