Users of subsurface street space shall maintain accurate drawings, plans and profiles showing the location and character of all underground structures, including abandoned installations. Corrected maps shall be filed with the City Engineer periodically, but at least every 90 days after new installations are made. [Ord. 1021 § 20, 1961; Code 1970 § 12.24.360; Code 1954 § 4-5.144.]