PURPOSE: This rule prescribes the approved type of monumentation to be used on property boundary surveys.

1. (1) General Requirement for Permanent and Semi-Permanent Monument. The surveyor shall select a type of monument providing a degree of permanency consistent with that of the adjacent terrain and physical features and as required by these standards. All monuments shall be solid and free from movement. They shall be set in the ground at least to the depth of the minimum length given unless they are encased in concrete. With the exception of drill holes and cut crosses, the precise position of the corner shall be marked by a point on a cap and the cap shall be inscribed with the registration number of the land surveyor in responsible charge, or the corporate registration number or name of the company.

2. (2) Permanent monuments shall be selected from the following:

   1. (A) Concrete monuments consisting of reinforced concrete at least four inches (4") square or in diameter and no less than twenty-four inches (24") in length with its precise position marked by a point on a brass or aluminum cap not less than one and one-half inch (1 1/2") in diameter;
   2. (B) Commercial cast iron or aluminum survey markers no less than twenty-four inches (24") in length. Nonferrous markers shall have ceramic magnets attached to aid in recovery;
   3. (C) Steel, coated steel, or aluminum rod markers not less than five-eighths inch (5/8") in diameter, iron pipe markers not less than three-quarter inch (3/4") inside diameter and not less than twenty-four inches (24") in length. These monuments shall have a permanently attached cap of the same metal or of a dissimilar metal if the metals are insulated with a plastic insert to reduce corrosion. Nonferrous rod markers shall have ceramic magnets attached to aid in recovery; and 10 CSR 30-2
   4. (D) Brass or aluminum disk not less than two inches (2") in diameter, countersunk and well-cemented in a drill hole in either solid rock or concrete. Ceramic magnets shall be attached or installed with the disk to aid in recovery.

3. (3) Semi-permanent monuments shall be selected from the following:

   1. (A) Iron pipe markers not less than threefourths inch (3/4") outside diameter at least eighteen inches (18") in length and having a plastic or metal cap;
   2. (B) Steel or aluminum rod markers not less than one-half inch (1/2") in diameter and not less than eighteen inches (18") in length and having a plastic or aluminum cap;
   3. (C) In urban built-up areas, a cross-cut in concrete, brick, or stone paving at the precise position of the corner or on a prolongation of a boundary line; and
   4. (D) In asphalt paving, railroad (R.R.) spikes, cotton picker spindles, and other metal devices that are solid and not easily removed or destroyed. P.K. nails and concrete nails are not to be used as semi-permanent monuments.
4. (4) Installation of Survey Monuments. All monuments will be installed in accordance with these standards and according to installation details approved by the local governing body that take into account local conditions.
5. (5) Existing Survey Monuments. Existing monuments shall be evaluated for permanency by the surveyor. In no instance shall the surveyor be required by these standards to remove existing monuments unless the installation of a new monument is necessary to preserve the position of the corner.
6. (6) When it is impractical to set a required monument, a witness monument shall be set. It should be placed five feet (5') or more away from the point and preferably at an even foot. Witness monuments less than five feet (5') from the point must be clearly identified and shown on the plat. The location of the witness monument should be along a line of the survey or a prolongation of such line.

AUTHORITY: sections 60.510(7) and 60.550, RSMo 1986 and 448.2-109, RSMo Supp. 1988.* Original rule filed May 3, 1994, effective Dec. 30, 1994.

*Original authority: 60.510(7) and 60.550, RSMo 1969 and 448.2-109, RSMo 1983, amended 1988.