A. Size Of Excavation Not Increased; Exception: No person shall increase the size of any excavation by opening it more than fifty percent (50%) of the area provided for in the permit issued pursuant to this chapter, or to extend the dimensions of the excavation to such extent that the street, avenue or alley will be blockaded, without obtaining the permission therefor from the city engineer.
B. Tunnelling: Tunnelling will be allowed only when permission is given by the city engineer, except under curbs and gutters, or sidewalks not over five feet four inches (5'4") in width, and whenever tunnelling is resorted to, it shall be done with the minimum amount of excavation possible. The charge to be made in estimating or figuring costs for tunnelling shall be twenty cents ($0.20) per square foot based on the trench width for the excavation for which estimated or measured, except when the tunnel backfilling is done by the permission and under the direction of the city engineer. In case any pavement or sidewalk becomes unsupported, due to caving or any other cause, to the extent that, in the opinion of the street commissioner, backfilling and compacting cannot be made in a satisfactory manner, it shall be removed and charged for according to the rates established by the city council for backfilling.
C. Pushing Or Jacking Pipe Under Roadways: Pushing or jacking cast-iron pipe service sewer under roadways will be permitted, providing the cast-iron pipe is left uncovered at each end so that it can be readily ascertained that no excavation was made by tunnelling. In case cast-iron pipe is pushed through an existing service sewer, each end of the existing sewer shall be closed against the cast-iron pipe with cement mortar.
D. Segregation Of Excavated Paving Materials: Any person excavating in wood block or brick pavements, or in rock or gravel, or in surfaced roadways shall pile such wood block, brick or gravel in a pile convenient for the city's use, and separate from other excavated materials. (Rev. Ord. 1783, Comp. 1941, p. S-20)