All excavations in any street, public easement, alley, sidewalk, street right of way or other public way shall be carefully guarded at all times with sufficient barriers, which during the nighttime shall be indicated by colored lights or torches or such other precautions as shall be necessary to guard the public against accidents. At all times the work shall be done so as to cause the least inconvenience to the property owners and the general public. The cost of such barricades, warning lights or such other features the Director may require shall be borne by the contractor. (Ord. 35-69. Passed 8-4-69.)