Any excavation made by any licensed sewer contractor in any public place or immediately adjacent thereto shall be protected and guarded by fencing or covering and by proper lights. The protection of the public from the danger of such excavation shall be the responsibility of the side sewer contractor. The contractor shall be liable on his bond for any damage caused by his failure to properly protect and guard such excavation as herein required. If the contractor fails to properly protect and guard such excavation as herein required, the City Engineer may properly protect and guard such excavation and charge the cost thereof to the side sewer contractor, who shall, upon receiving written notice of the amount of such charge or by the posting of a notice of the amount of such charge at the location of the excavation, immediately pay the same to the City Treasurer. (Ord. 208 § 27, 1957).