(A) Unless otherwise approved or specified by the Administrative Authority, the minimum cover of substructure except pipelines carrying hazardous substances shall be as follows:
(1) Streets and alleys.
(a) Twenty-four inches below the established flow line of the nearest gutter; or
(b) If said flow line is not established, then the depth shall be at a minimum of 30 inches below the surface of the nearest outermost edge of the traveled way.
(2) Parkways. Eighteen inches below established or proposed parkway elevation.
(3) Other public places. Twelve inches below the surface.
(B) Notwithstanding the above requirements, any such new or relocated installation intended to carry hazardous substances shall be constructed at a depth of at least 42 inches below the established grade of the gutter of such street or alley.
(C) Nothing in this section shall impose a duty upon the permittee to maintain said specifications as required herein upon subsequent changes of elevation in the surface unless the elevation of said substructure interferes with the maintenance of, or travel on, a public street.
('65 Code, § 7-3.09) (Ord. 349-C.S., passed - - )