PURPOSE: This rule prescribes requirements for referencing corners of the United States Public Land Survey to the Missouri State Plane Coordinate System.

1. (1) When the corner that is removed, altered, restored, or reestablished is required to be referenced to the Missouri State Plane Coordinate System, the corner coordinates shall be shown on the Certified Land Corner Document form.

   1. (A) Values for the Missouri State Plane Coordinate System may be expressed in feet and decimals of a foot or meters and decimals of a meter. When values are expressed in feet, the international foot shall be used as the standard foot for the Missouri State Plane Coordinate System. One (1) international foot equals 0.3048 meters exactly or one (1) inch equals 2.54 centimeters exactly as defined by the National Institute of Science and Technology (NIST).

2. (2) Coordinates referenced to the Missouri State Plane Coordinate System and shown on Certified Land Corner Document forms shall comply with the following requirements:

   1. (A) The position of the corner shall be based upon a geodetic control station having a horizontal accuracy of second order (as defined in 2 CSR 90-62) or higher order;
   2. (B) The survey connecting the corner to the geodetic control station shall meet the accuracy standards set forth in the Missouri Standards for Property Boundary Surveys; and

   3. (C) The following information shall be included on the Certified Land Corner Document form:

      1. 1. The geodetic control station(s) that were used to

determine the position of the corner;

1. 2. The coordinates of the geodetic control station(s) used

and the appropriate Zone designation;

1. 3. The appropriate adjustment date or realization desig-

nation and Datum/Terrestrial Reference Frame, along with the epoch date when applicable. Epoch date refers to Reference Epoch Coordinates (RECs). Coordinates estimated by National Geodetic Survey (NGS) for one (1) of the official reference epochs NGS will define (every five (5) or ten (10) years, as currently planned). As these coordinates are computed by NGS they are considered part of the National Spatial Reference System (NSRS);

1. 4. A brief statement of the method used to obtain the

position; and

1. 5. The grid factor used, if applicable.

1. (3) Coordinates referenced to the Missouri State Plane Coordinate System may be used to reference corners in lieu of monuments.

AUTHORITY: sections 60.321 and 60.550, RSMo 2016.* Rule originally filed as 10 CSR 30-3.070. Original rule filed May 3, 1994, effective Dec. 30, 1994. Moved to 2 CSR 90-61.070 and amended: Filed Dec. 1, 2016, effective June 30, 2017. Amended: Filed Jan. 8, 2025, effective Aug. 30, 2025. *Original authority: 60.321, RSMo 1989, amended 2013, and 60.550, RSMo 1969, amended 2013.