3.3 Monumentation, Tie Lines & Mapping Requirements (21 NCAC 56 .1602(d)-(h) & .1604)

3.3 Monumentation, Tie Lines & Mapping Requirements (21 NCAC 56 .1602(d)-(h) & .1604)

This is the section where third-party prep material most often goes wrong, so start with what the rules do not say.

[!CAUTION] North Carolina publishes no monument dimensions. 21 NCAC 56 contains no half-inch minimum diameter, no 24-inch minimum length, no "#4 rebar" specification, and no requirement that a cap be stamped with the surveyor's or firm's license number. Charts asserting those figures are importing another state's standards. If an exam item offers a specific pipe diameter as "the North Carolina requirement," it is a distractor. The correct answer is the language the rule actually uses: metal stakes or materials of comparable permanence.

That does not make caps or #5 rebar bad practice — many North Carolina surveyors use both, and local subdivision ordinances frequently impose their own specifications. It means the state standard is a durability standard, not a dimensional one.

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1. The Monument Rule (21 NCAC 56 .1602(d), (e), (f))

(d) All corners. "Except as provided in Paragraph (e) of the Rule, metal stakes or materials of comparable permanence shall be placed at all corners." Two words carry the load: metal stakes sets the presumptive material, and comparable permanence opens the door to concrete monuments, drill holes in rock, and similar durable markers.

(e) Inaccessible corners. "Where a corner falls in a right-of-way, tree, stream, or on a fence post, boulder, stone, or similar object, one or more monuments or metal stakes shall be placed in the boundary so that the inaccessible point may be located accurately on the ground and the map."

         PROPERTY CORNER FALLS IN A LIVE STREAM CHANNEL

         A ------------------- WC ~~~~~~~[X]~~~~~~~ WC ------------ B
                                 |        true        |
           set metal stake       |       corner       |    set metal stake
           IN THE BOUNDARY       |    (inaccessible)  |    IN THE BOUNDARY

         .1602(e): one or more monuments or metal stakes placed IN THE
         BOUNDARY so the inaccessible point can be located accurately on
         the ground AND on the map.
         .1602(f): if no monument is found or set for that point, NOTE IT.

Notice the geometry the rule specifies: the witness monuments go in the boundary, not merely somewhere nearby on convenient ground. The plat must then carry enough data — bearing and distance from each witness monument to the true corner — that a later surveyor can reproduce the corner position.

(f) Reporting. The results of a survey shall be reported to the user as a map or report of survey, in a clear and factual manner, and:

• All reference sources shall be identified.
• Artificial monuments called for shall be described as found or set.
• When no monument is found or set for a point described under (e), that fact shall be noted.

"Found or set" is the phrase to burn in. A plat that shows an iron pipe without saying whether the surveyor recovered it or placed it destroys the evidentiary value of the very thing a retracing surveyor needs most.

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2. Tie Lines (21 NCAC 56 .1602(g))

The tie-line rule is a Board Rule, separate from the plat-recording statute:

• Where a survey is reported as a plat or written description, one or more corners shall be accurately tied, by a system of azimuths or courses and distances, to a horizontal control monument of some United States or State Agency survey system, such as the North Carolina Geodetic Survey, where such monument is within 2,000 feet of the subject property, right-of-way, easement, or other surveyed entity.
• Where the North Carolina grid coordinates of that monument are on file with the Department of Public Safety, Emergency Management, Geodetic Survey office, the coordinates of both the referenced corner or point and the monument(s) shall be shown as X (easting) and Y (northing).
• The coordinates shall be identified as based on "NAD 83" or "NAD 27." NGS datums are incorporated by reference, including subsequent amendments and editions.
• Tie lines to monuments shall be sufficient to establish true north or grid north bearings for the plat or description if the monuments exist in pairs.
• Control monuments within a previously recorded subdivision may be used in lieu of grid control, and in the interest of bearing consistency with previously recorded plats, existing bearing control may be used where practical.
• In the absence of grid control, other natural or artificial monuments or landmarks shall be used. In all cases the tie lines must be sufficient to accurately reproduce the subject lands from the control or reference points used.

Section 4.4 covers how this interacts with the coordinate requirement in G.S. 47-30(f)(9), which the General Assembly rewrote in 2019 and which is not the same rule.

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3. Area Computation (21 NCAC 56 .1602(h))

Area "is to be computed by double meridian distance or equally accurate method and shown on the face of the plat, written description, or other document." Area computations by estimation, by planimeter, by scale, or by copying from another source are not acceptable — "except in the case of tracts containing inaccessible areas and in these areas the method of computation shall be stated."

Coordinate-geometry area from a closed, adjusted traverse is an "equally accurate method." Lifting the acreage from the deed is copying from another source and is prohibited.

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4. The Plat-Content Rule (21 NCAC 56 .1604)

Rule .1604 is titled "Mapping Requirements for Boundary Surveys" — it is not the monument rule. Paragraphs (a) through (c) set three general requirements, and paragraph (d) sets twelve mandatory elements for every plat unless marked "Preliminary Plat - Not for recordation, conveyances, or sales."

(a) Map size such that all details are legible on a copy. (b) Any lines not actually surveyed shall be indicated on the map with a statement revealing the source of the information from which the line is derived. (c) All surveys based on the North Carolina grid system shall contain a statement identifying the coordinate system referenced datum used.

(d) The twelve elements. Every non-preliminary plat shall be sealed, signed, and dated by the PLS and shall contain:

The .1604(d)(12) certificate (non-recorded maps and all survey reports)

"I certify that this map was drawn under my supervision from an actual survey
made under my supervision (deed description recorded in Book ____, page ____ or
other reference source ____________); that the boundaries not surveyed are
indicated as drawn from information in Book ____, page ____ or other reference
source ____________; that the ratio of precision or positional accuracy is
____________; and that this map meets the requirements of The Standards of
Practice for Land Surveying in North Carolina (21 NCAC 56 .1600)."

This ____ day of ____________, 2____.

Seal                          ____________________________________
                              Professional Land Surveyor

Compare this with the G.S. 47-30(d) certificate used on recordable plats, which recites compliance "in accordance with G.S. 47-30 as amended" and requires the license number. Section 4.2 sets the two side by side. The practical rule: a map headed to the Register of Deeds carries the statutory certificate; an office map, exhibit, or written report of survey carries the .1604(d)(12) certificate.

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5. Why Original Monuments Still Control

Nothing in Section .1600 disturbs the common-law hierarchy taught in Chapter 5. When an original, undisturbed monument called for in the deed is recovered, it marks the legal corner even where modern measurement shows the recited distance was off. The rules govern what the surveyor must place, report, and show; the priority of calls governs which evidence controls. A surveyor who sets a new pin "at the deed distance" and ignores a recovered original monument has satisfied .1602(d) and violated the boundary law that gives the corner its meaning.