(A) Preservation of existing monuments. All federal, state, county, or official benchmarks, monuments, or triangulation stations in or adjacent to the subdivision shall be preserved. Before moving any benchmark, monument or triangulation station, the authority having jurisdiction over the monument shall be notified and given sufficient time to take appropriate action. All elevations shall be referred to National Geodetic Vertical Datum of 1988 (NAVD 88), which supersedes the NGVA 29 datum used prior to September 18, 2013.
(B) Placement of new monuments. Permanent monuments shall be erected in all places and manner prescribed in 765 ILCS 205/1.
(Ord., § 10.17, passed 10-13-2009)