Upon the failure, neglect or refusal of any owner or agent, or the person responsible so notified to properly dispose of litter dangerous to the public health, safety or welfare within the time for compliance provided in the written notice provided in ACC 8.16.240, or within 24 hours after the date of such notice in the event the same is returned to the city post office department because of its inability to make delivery thereof, provided the same was properly addressed to the last known address of such notified person, the enforcing authority is authorized and empowered to pay for the disposing of such litter or to order its disposal by the city. (Ord. 4276 § 5, 1988; 1957 code § 7.12.210(B).)