No person shall excavate on land sufficiently close to the property line to endanger an adjoining public street, sidewalk, alley or other public property, without supporting and protecting them from settling, cracking, or other damage that might result from the excavation. If, in the opinion of the city engineer, the nature of the excavation creates a hazard to life unless adequately fenced, the city engineer may require the applicant to construct fences or guard rails to safeguard persons using the public street, sidewalk, alley or other public property. [BC 9.05.145, amended by Ordinance No. 4249, 4/7/03]