All sidewalk improvements shall be done under the direction and supervision of the city engineer or his duly authorized agent, and subject to the inspection and approval of the engineer or his agent.  Whenever any sidewalk improvements are made which do not conform to the provisions of this chapter and with the specifications herein referred to, or where any sidewalk improvements are made without obtaining a permit therefore as in this chapter provided, or the work is not performed within the time provided for and stated in the permit obtained, the city engineer, or his duly authorized agent, may serve upon the property owner or his agent, and upon the contractor or party interested and doing the work, a written notice to obtain a permit therefore, if not already obtained, or, if the sidewalk is in the course of construction, to stop the work, and if the sidewalk work has been completed, to obtain a permit therefore, perform necessary sidewalk improvements within five days from the receipt of said notice as the case may be, in the proper manner and of proper materials as required by this chapter and specifications herein referred to, and in case they, or any one of them, shall fail to do so, the city engineer or his duly authorized agent may cause the sidewalk to be removed, constructed, reconstructed or repaired in a proper manner and of proper materials, and the cost thereof shall be assessed to the property fronting thereon.  There shall be returned to the council an itemized and verified statement of expenditures of material and of the labor used in doing such work, and the legal description of the lot, part of lot, or parcel of ground abutting the sidewalk on which such work has been performed.  (Ord. S-30306, 1976).