The property owner shall be responsible for the maintenance and repair of faulty or defective sidewalks abutting his property and may have repair or construction done by private contract. When construction or repair is done by the City or its agents, the cost shall be assessed against the abutting property owner. The Safety-Service Director may conduct surveys of sidewalk conditions and upon passage of a resolution by Council ordering repair or installation, direct that repair be completed where faulty or defective conditions exist. If the property owner does not have such repair workdone within thirty days from such notification, the Director may direct that the work be done by the City and the cost assessed against the property owner.