(A) All federal, state, county, or official bench marks, monuments, or triangulation stations in or adjacent to the subdivision shall be preserved. When a proposed improvement in a subdivision makes necessary the moving of bench marks, monuments, or triangulation stations, the authority having jurisdiction shall be notified and given sufficient time to take appropriate action.
(B) Permanent monuments shall be erected at the intersection of all right-of-way lines and all points where right-of-way lines intersect the exterior lines of the subdivision and at all lot corners, block corners, angles in lot lines, points of beginning or ends of curves and in all places and manner prescribed in Article 109-1 of the Illinois Revised Statutes, as amended. All permanent monuments shall be in place and shall be buried no more than six inches below the finished ground surface at the time of completion of all grading work.
(C) Permanent monuments shall be either:
(1) Galvanized iron pipe not less than 3/4-inch in diameter and not less than 22 inches in length;
(2) Solid square or round iron bars, 22 inches in length but having a minimum weight of 1.043 pounds/lineal foot.
(3) Stone or concrete, 30 inches long by 4 inches square or 5 inches in diameter.
(Ord. 76-O-10, passed 9-21-76)