All sidewalks and curbs shall conform strictly to grade and line stakes, and after the line stakes are once set, constructors and others must use due care in preserving the stakes. Inspection of the premises by the superintendent of streets shall be required prior to the installation of curbs and sidewalks. All work done and materials furnished shall be first class in all respects and shall be done to the satisfaction and acceptance of the superintendent of streets upon completion of sidewalks or curbs. (Ord. 483, 4-16-1956)