§ 25-96. Monuments, markers and survey criteria.

(a)

Monuments required. Prior to the offering of the plat of any subdivision for record the land surveyor shall establish, or confirm the prior establishment of permanent monuments at each and every controlling corner on the boundary of land being subdivided, and shall be seen at the following locations:

(1)

At every corner and angle point of every lot, block or parcel of land created.

(2)

At every point of intersection of the outer boundary of the subdivision with an existing or created right-of-way line of any street, railroad, or other way.

(3)

At every point of curve, point of tangency, point of reversed curve, or point of compounded curve on each and every right-of-way line established.

In such cases where the placement of required monument at its proper location is impractical it shall be permissible to set a reference monument close by that point, and if such reference monument is set prior to the recording of the plat and its location properly shown, it shall have the same status as other monuments of record; where any point requiring monumentation has been previously monumented, the correctness of the existing monument shall be confirmed by the land surveyor, if used, and if so confirmed, shall likewise be considered a monument of record when properly shown and described on the plat recorded.

(b)

Type of monuments. The type of permanent monument to be placed shall be selected from the following types. The surveyor shall select a type providing the degree of permanency consistent with that of the adjacent terrain and physical features.

(1)

Iron pipe not less than one-half-inch inside diameter and/or solid or coated steel rods not less than one (1) inch in diameter and not less than twenty-four (24) inches in length. These monuments shall be solid and free from movement and below normal frost line.

(2)

Metal markers shall be no less than twenty-four (24) inches in depth unless encased in concrete with its precise position marked by a point or cross. These monuments shall be placed so as to be solid and free from movement and below normal frost level.

(3)

Concrete monuments consisting of reinforced concrete at least four (4) inches in width or diameter and not less than twenty-four (24) inches in depth with its precise position marked on a metal cap, by a formed cross or metal rod.

(4)

Brass disk not less than two (2) inches in diameter, countersunk and well cemented in a drill hold in either solid rock or concrete with its precise position marked by a point or cross.

(c)

Reference to direction and basis of bearing. Reference to direction shall be established by one (1) of the following methods: Astronomical Observation (true North), state plane coordinate north, a recorded bearing of an established and well-fixed line, or use of modern devices for the determination of true north that have been proven equal or superior to the previously stated methods. The final plat shall carry on its face a note explaining the basis of bearing.

(d)

Error of closure. The accuracy of the field work thus performed shall be substantiated by the computations of a closed traverse. The relative error of closure permissible shall be no greater than one (1) foot in ten thousand (10,000) feet.

(e)

The positional tolerances. Block or lot corners must relate to one another within specified tolerances. Such tolerances shall be designated under the following classification:

(1)

Class I. Small areas wherein dense monument controls exist, as in a downtown commercial area. Lots fifty (50) by one hundred (100) feet.

(2)

Class II. Longest side under two hundred fifty (250) feet.

(3)

Class III. Longest side from two hundred fifty (250) feet to one thousand three hundred twenty (1,320) feet. No side under one hundred (100) feet.

(4)

Class IV. All sides one thousand (1,000) feet or larger and those having a periphery of five thousand two hundred eighty (5,280) feet or more.

(5)

The positional tolerances for these classes will be:

a.

I ..... 0.10 foot

b.

II ..... 0.25 foot

c.

III ..... 0.50 foot

d.

IV ..... 1.00 foot

Minimum Required Improvements
and Design Criteria

Maximum Degree of Curve

Arterial streets ..... 10 degree curve

Collector streets ..... 15 degree curve

Commercial, industrial ..... 20 degree curve

Local streets ..... 40 degree curve

(Subdivision Regulations, § VIII(D))