(A) All sidewalks built over areas or open spaces shall be constructed with suitable supports by walls, arches or iron beams according to specifications to be approved by the City Engineer.
(B) All work shall be under his or her supervision and the quality and proportion of the material and workmanship used in all the foregoing shall be subject to the approval, direction and control of the City Engineer as aforesaid.
(`90 Code, § 19-14)