Prior to the approval of the final plat, permanent reference points shall have been placed in accordance with the following requirements.
(A) Subdivision corner tie. At least one corner of the subdivision shall be designated by course and distance (tie) from a readily discernible reference marker. If a corner is within 2,000 feet of a U.S. Coast and Geodetic Station or N.C. Grid System coordinated monument, or city coordinated system, then this corner shall be marked with a monument so designated by computed X and Y coordinates, which shall appear on the map with a statement identifying this station or monument to an accuracy of 1:10000. When such a monument or station is not available, the tie shall be made to some pertinent and readily recognizable landmark or identifiable point, physical object, or structure that could not be destroyed.
(B) Monuments. Within each block of a subdivision at least two monuments, designed and designated as control corners, shall be installed. The surveyor shall employ additional monuments if and when required. All monuments shall be constructed of concrete and shall be at least four inches in diameter or square, and not less than three feet in length. Each monument shall have imbedded in its top or attached by a suitable means, a metal plate of noncorrosive material and marked plainly with the point, the surveyor's registration number, the month and the year it was installed, and the word "monument" or "control corner." Monuments shall be set at least 30 inches in the ground, with at least six inches exposed above the ground unless this requirement is impractical.
(C) Property markers. A steel or wrought iron pipe or the equivalent, not less than 3/4 inches in diameter and at least 30 inches in length, shall be set at all corners, except those located by monuments. A marker shall also be set at a point of curve, point of intersection, property corner, point of tangency and reference point unless a monument is placed where necessary.
(D) Accuracy. The allowable angular error of closure and linear error of closure for surveys within the city limits and extraterritorial jurisdiction shall be as follows.
(1) Angular error of closure within the city limits shall not exceed 25 seconds times the square root of the number of angles turned.
(2) Linear error of closure within the city limits shall not exceed one foot per 7,500 feet of perimeter of the lot of land (l:7,500).
(3) Angular error of closure beyond the city limits shall not exceed 30 seconds times the square root of the number of angles turned.
(4) Linear error of closure beyond the city limits shall not exceed one foot per 5,000 feet of perimeter of the land (l:5,000).
(‘58 Code, § 14-10) (Am. Ord. 16-48, passed 11-21-16; Am. Ord. 21-02, passed 1-19-21; Am. Ord. 21-26, passed 7-12-21; Am. Ord. 22-01, passed 1-3-22) Penalty, see § 10.80