In order to promote efficiency in the removal of wastes, and to make the regulation thereof more concentrated and effective, there shall be no more than one licensee for the collection of garbage, refuse, rubbish and ashes at any one time and any such license shall not be granted for a period to exceed five years from date of issue. (Ord. 525 § 2, 1979; Ord. 344 § 5, 1971).