The council declares that all weeds growing upon private property or streets in the city and all debris on private property or streets in the city are public nuisances. Also, it is unlawful for any property owner in the city to cause or permit any debris to be or remain on any real property in the city or on portions of streets adjoining such real property to the centerline of such streets. It shall be the duty of every such person to remove or destroy such weeds and/or debris. Destruction by burning within the city shall be unlawful unless the written permission of the chief of the fire department is first obtained. (Prior code § 5220.2)