The person constructing any sidewalk shall for a distance of one foot on the outside of the sidewalk leave the surface of the ground one inch lower than the walks, and shall remove all surplus dirt excavated by him, other rubbish or materials from the street or premises. He shall also replace all connecting sidewalks, aprons or crossings in a workmanlike manner, under the direction of the City Engineer or the Superintendent of Streets.
('68 Code, § 6.25)