In accordance with "An Act to Revise the Law in Relation to Plats", ILCS Ch. 765, Act 205, §§ 1 et seq., as amended from time to time:
   (A)   Stone or reinforced concrete reference monuments are to be set in the ground in such a manner that they will not be moved by frost. Reference monuments are to be placed as directed by the village staff, but a minimum of one in a corner of a four-sided development; and
   (B)   All lot corners shall be marked by one-half-inch iron pins not less than 24 inches long. These pins shall be driven into the ground deep enough that they do not protrude above the ground surface more than one-half inch.