It is unlawful to plant poplar, cottonwood, soft maples, willow, or any other tree or shrub whose roots are likely to obstruct public or private sewers. The superintendent is authorized to remove any trees or shrubs from any public street, or the roots of any trees or shrubs which extend into any public street, when the trees or the roots thereof are obstructing, or when he determines that they are liable to obstruct, public or private sewers; provided, however, that he shall give 10 days’ notice in writing to the owner or occupant of the abutting property to remove the same, and if such owner or occupant fails or refuses to do so, the reasonable cost of such removal from either private property, alleys or street, when done at the direction of the superintendent shall be a charge against, and a lien upon, the abutting property from which such trees or shrubs are removed, and the city attorney is authorized and directed to collect such charge by suit maintained in the name of the city as plaintiff, against the owner in any court of competent jurisdiction. (Ord. 209 § 14, 1974).