In addition to monumentation required by the Illinois Plat Act, at least two subdivision boundary corners, preferably diagonally opposite, shall be definitely marked with permanent monuments. Permanent markers shall extend below the frost line and be concrete with an embedded ferrous rod or cap having a minimum dimension of four inches or a steel pipe firmly embedded in concrete. Should conditions prohibit the placing of monuments on line, off-set marking will be permitted, provided that off-set courses and distances are shown on the subdivision plat. A permanent benchmark shall be accessibly placed and accurately noted on the subdivision plat.
(Ord. 9278, passed 6-22-2015)