A.
Establishment. The grades of all streets, alleys and sidewalks shall be established and described by the Board and shall be recorded by the Clerk-Treasurer in his office.
B.
Required. No street, alley or sidewalk shall be worked until the grade thereof is established.
C.
Altering prohibited. No person shall alter the grade of any street, alley, sidewalk or public ground, or any part thereof, unless authorized or instructed to do so by the Board.