In all trenches four feet or more in depth, all material excavated therefrom and piled adjacent to the trench, or in public properties, shall be piled and maintained in such a manner that the toe of the slope of the excavated material is at least 18 inches from the edge of the trench. It shall also be piled so that as little inconvenience as possible is caused to public travel and shall be placed so as not to interfere with the flow of water as provided for in this chapter. When the confines of the area through which pipes are to be laid are too narrow to permit the piling of excavated material beside the trench, such as might be the case in an alley, the permittee may be required to haul excavated material to a storage site and then rehaul it to the trench site at the time of backfilling. It shall be the permittee’s responsibility to secure the necessary permission and make all necessary arrangements for all storage and disposal sites required. [Ord. 1021 § 19.02, 1961; Code 1970 § 12.24.230; Code 1954 § 4-5.92.]