In accordance with "An Act to Revise the Law in Relation to Plats", 765 ILCS 205/1 (a), et seq., as amended from time to time, reference monuments shall be erected by each Subdivider as follows:
(A) In the Field. Stone or reinforced concrete reference monuments, set in the ground in such a manner that they will not be moved by frost, shall be placed in the field, at opposite comers of the subdivision.
(B) At Lot Corners. Every lot corner shall be marked by an iron pin or pipe, at least one-half (1/2) inch in diameter and not less than twenty-four (24) inches long, driven into the ground deep enough that they do not protrude above the surface more than one and one-half (1 ½) inches.
(1) No lot in any subdivision shall be sold unless the corners of said lot are marked as specified above at the time of sale.
(C) Front Lot Corners. Front lot corners abutting platted street shall be marked in the curb by a saw cut "T” (minimum of one-fourth (1/4) inch deep and maximum of one-half (1/2) inch deep) in addition to the lot pins required above.