When it appears that the laying or repairing of any water or sewer pipes or the making of any connection therewith shall require excavation in any street, alley or public way of the city or the cutting or removal of any pavement, curb or gutter or any sidewalk, during the course of such work, the application for a permit shall so state and describe the location and extent of the excavation, cutting or removal. Before the City Clerk shall issue any permit for such work, the applicant shall pay any fee required by this code. All excavations shall be barricaded and guarded as provided by the appropriate sections of this code. Before any such excavation shall be backfilled, new plumbing work therein shall be inspected and the bottom of the excavation holding any sewer, drain or water pipe shall be so filled, leveled and tamped as to properly support the pipe and permit proper drainage when carrying sewage, and the excavation shall be backfilled and all paving, curbing, guttering or sidewalks shall be restored as near as possible to their last condition, subject always to the approval of the Plumbing Inspector or the Superintendent of Streets.