In the event any person giving such bond, or his assigns, shall fail to procure or complete such work according to this title and the specifications contained in the ordinances of the City governing such work, and in accordance with the contract, or to grade the unpaved portion of the sidewalk to the official grade thereof, or shall fail to remove the debris or surplus dirt upon completion of such work, the street department, or the person owning the property fronting upon the street or other public place where the work is contracted to be done, may do or complete such work according to the contract and the specifications in force at the time such work is done, and may remove the debris and material from the street, as the case may be, and such person giving such bond, and the sureties thereon, shall be liable to the City, or to the person causing the work to be completed, in a civil action upon such bond for the costs and expenses necessarily incurred in connection with the completion of such contract and the removal of such debris and surplus material. (Ord. 1205 § 2, 1969; prior code § 27.402(2)).