No person shall, without written permission of the Street Superintendent, install any substructure except manholes, vaults, valve casings, culverts, and catch basins at a vertical distance less than the following:
(A) Streets. Twenty-four inches below the established flow line of the nearest gutter. If said flow line is not established, then the depth shall be at a minimum of 24 inches below the surface of the nearest outermost edge of the traveled portion of the street;
(B) Parkway.
(1) The minimum depth of any substructure shall be 16 inches below established gutter grade when said substructure parallels the parkway.
(2) The minimum depth of any substructure shall be 12 inches below the top of the established sidewalk or curb when such substructure is at right angles to the parkway.
(C) Other public places. The minimum depth of any substructure in any other public place shall be 12 inches below the surface. Nothing in this section shall impose a duty upon the permittee to maintain said specifications as required herein upon subsequent changes of grade in the surface unless the grade in said substructure interferes with the maintenance of or travel on a public street.
(Prior Code, § 33.4.21) Penalty, see § 10.99