(a) Paved streets. Any person who shall excavate in the paved portion of any public street, roadway, alley or sidewalk shall backfill such excavation with a fine stone aggregate material conforming to the following gradation: not more than fifteen (15) percent of the aggregate shall be of organic material; not more than ten (10) percent of the aggregate shall be retained on a one-inch square mesh screen, and not less than twenty (20) percent of the aggregate shall pass a fourteen-mesh screen.

    (b) Unpaved streets. Any person who shall excavate in any unpaved portion of any public street, roadway, alley or sidewalk shall backfill such excavations as is provided for backfilling excavations in paved public streets, alleys and sidewalks or, upon the approval of the director of public works, the material removed from such excavation may be used for backfill, provided such material is placed in the excavation in lifts not exceeding six (6) inches and each lift being mechanically compacted to a relative density of ninety-five (95) percent; such backfill shall be inspected by the director of public works to determine whether the requirements of this section have been fulfilled.

(Code 1964, §§ 14.110, 14.120)