It shall be the duty of the director of public works, upon the adoption by the city council of a resolution directing him so to do, under the direction of the mayor, to gather, collect and dispose of by dumping, burning, distribution or sale, all garbage, rubbish and waste matter, except as herein otherwise provided, within the city. The city council may authorize and empower the director of public works to dispose of the same in such manner as it may deem proper for the best interests of the city and in compliance with rules and regulations adopted and promulgated as hereinbefore provided. It shall be the duty of the director of public works, if so directed by resolution as aforesaid, or of the city garbage collector, if a contract be in effect to that end, to collect all garbage and rubbish in the city, at least once each week and at such other times as the necessities of the particular case may require. (Ord. 117 § 20, 1972)