No scavenger shall engage in the work of removing the contents of any privy vault, except between the hours of ten p.m. and five a.m. or conveying any garbage, refuse or others materials for which a scavenger license or permit is required on Hewitt Avenue or within one block of Hewitt Avenue in city between the hours of nine a.m. and seven p.m. (Ord. 295-74 Ch. 23 § 8, 1974.)