All excavations for buildings and structures shall be protected and guarded against danger of injury or death to the public by suitable barricades and lighted where the public is normally nearby. Permanent excavations shall have retaining walls of masonry or concrete of sufficient strength to retain the embankment together with all necessary loads. All excavations made below grade shall be protected so that soil of the adjoining property may not cave or settle. Adequate drainage shall be provided at the building site. To allow for proper inspection of footings, foundations, and the water-proofing thereof, all excavations shall extend at least one foot beyond the exterior of foundation walls. (Ord. 1977-10 § 6-11, 1977)