In the event that any unauthorized obstructions or debris are placed upon the sidewalks, curbs, gutters or streets, the Director of Public Works shall immediately notify the owner of record, the occupant or occupants, or person having charge of the real property lying adjacent to or contiguous to said portion of the public right-of-way containing said unauthorized obstructions which have been placed thereon at any time, either prior to or subsequent to July 18, 1969, and being any obstruction, thing, object, or material, whether organic or inorganic, that the obstruction shall be removed forthwith or within a reasonable period of time as determined by the Director of Public Works, depending upon the nature of the obstruction, after receipt of said notice. In the event that said property owner, occupant or occupants, or person having charge of the property fails to remove the obstruction within the time set forth in this section or as determined by the Director of Public Works, the Director of Public Works shall cause the obstruction to be removed and a lien shall be imposed against the property in the manner provided in Sections 5610 through 5630 of the Streets and Highways Code of the state, and the lien shall be collected as a portion of the regular tax assessment as provided in Section 5628 of the Streets and Highways Code. (Ord. 1677 § 1, 1976; Ord. 1205 § 2, 1969; prior code § 27.209).