All sidewalks, curbs, gutters and/or curbs and parking constructed within the corporate limits of the City shall be constructed under the supervision of and subject to the inspection of the Public Works Director and in conformity with the lines and grades laid out on the ground by said Director. Stakes set by said Director shall be preserved by the owner and the contractor doing the work. (1980 Code § 9.3.9; amd. 1999 Code)