(a) Any alteration, change, repair, removal or replacement of curbs, or of pavements within the traveled right-of-way, shall be under the control and direction of the Director of Public Service and shall be done by the City through its duly authorized employees or contractors. For all newly-installed, re-located, or reinstalled curbs, the curb elevation shall be the elevation directed by the Commissioner of Engineering and Construction of the Department of Public Service.
(b) No curb shall be cut, lowered or installed at lower than customary height for access to premises unless the proposed use or the use of such premises is permitted by this Building Code and a permit, when required, has been issued for such use by the Commissioner.
(c) The length and location of each curb cut and lowered curb shall also be subject to the approval of the Traffic Engineer and, where such curb abuts a tree lawn, to the approval of the Commissioner of Shade Trees.
(d) The construction or alteration of sidewalks or driveways outside of a street or alley line or on public property shall be performed under permits from the Department of Public Service and in conformity with its regulations.
(e) Unless otherwise specifically approved by the Commissioner of Engineering and Construction of the Department of Public Service under unusual conditions or conditions which would otherwise result in undue hardship, all sidewalks shall be in stalled with a rise of three-eighths (3/8) of an inch to the foot from the top of the curb to the street or alley line, measured at right angles to the curb, provided that at street intersections where the grade of the intersecting street prevents compliance with these provisions, the sidewalk shall be laid as directed by and to the acceptance of the Commissioner of Engineering and Construction.
(f) Sidewalks shall be laid with the top surface properly roughened so that they will not become slippery when covered with moisture.