§ 9.22. Grades.
(1)
On file in office of director of public works. The grades of all streets, alleys, and sidewalks as established by the council shall be kept on file in the office of the director of public works
(2)
Recorded by clerk. The grades of all streets, alleys, and sidewalks shall be established and described by the council, and the adoption of such grades and all alterations thereof shall be recorded by the city clerk. No street, alley, or sidewalk shall be worked until the grade thereof is established and all streets, alleys, and sidewalks shall be constructed in accordance with such grade.
(3)
Altering grades prohibited. No person shall alter the grade of any street, alley, sidewalk, or public ground, or any part thereof, in the city unless authorized or instructed to do so by the council or the director of public works.
(4)
Datum plan of reference. The elevations given in all plans hereafter proposed for sewers, streets, gradings, pavements, bridges, public buildings, and all other public improvements shall be with reference to the established plan of reference and the bench marks on file in the office of the director of public works, entitled "Datum Plan of Reference."