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(a) Supplemental cadastral rectangular surveys are divided into four categories, each of which is surveyed to Class IV standards. If from time to time the Bureau of Land Management, or other authority or agency, establishes procedures that differ from those set out in the four categories, the division will issue special survey instructions for the official positioning of monuments.
(1) Category I applies if no rectangular cadastral survey corners have been set to define the rectangular survey township perimeter. The township is, therefore, legally described only by reference to the official protraction diagrams. The section corner positions along the perimeter and within the interior of the township must be established at the official protracted geodetic positions as shown on the official protraction diagram.
(2) Category II applies if monumentation exists on the perimeter of a township that is officially platted. All subsequent section, quarter section, and other corner positions must be located along the perimeter on line and at prorated distances between the monumentation of record. All interior section corner positions must be established at the official geodetic positions as shown on the official protraction diagrams. The interior section lines along the exterior one mile of the township must then be established as a line connecting the established geodetic positions of the interior section corners and the section corner positions as established on the exterior of the township. Whenever interior correction lines have to be established, because the configuration of the township exterior is not established at the official protraction positions, the division will issue special survey instructions for the official positioning of the correction line and corner monument positions.
(3) Category III applies if the perimeter of the township has been established and monumented, based on the official protraction diagrams, and interior monumentation defining a particular section of land also exists, based on the official protraction diagrams. When this situation exists, a section of land may be located within the interior portion of the township by continuation of the rectangular survey system in accordance with the approved protraction diagrams, using either the monumented interior section corners or the exterior perimeter section corner monuments, whichever is more appropriate. The rectangular system is then projected to within one mile of the other previously established section corner monument. Then the line connecting the existing corner and the newly established section corners is made and the quarter corner is set at midpoint and on line. However, if the connecting line does not close within the survey class accuracy assigned, a correction line is required and the division will issue special survey instructions to govern its location.
(4) Category IV applies if the perimeter boundary of a township has been established and monumented, based on either an official protraction diagram or on an older perimeter boundary survey done before the official protraction diagrams were approved. It also applies when the interior section corners have been established and monumented, based on either an official protraction diagram or an older survey done before the official protraction diagrams were approved. There are two survey data to contend with, one that controls the exterior boundary of the township and one that controls the interior section corners. Both may be physically monumented on the ground. If two such data exist, the division will issue special survey instructions establishing a correction line to control the basis for projection of the rectangular survey system throughout the township. These special survey instructions will govern the interior subdivision of the township.
(b) The following survey and platting standards apply to supplemental cadastral rectangular surveys:
(1) For the west tier of sections in a township, the north-south center section line must be established at 2,640 feet west of the section corners, and the remaining distance to the west section corners must be as established by field measurements. The east half of the section is platted as aliquot parts, with the west portion being divided into two tracts. These tracts will be designated as Tract A and Tract B, with Tract A being to the north. However, if smaller units than the two Tracts A and B are to be surveyed and platted, the sixteenth section corner positions must be set at 1,320 feet west of the quarter section corner position. The east half of the west half is platted as aliquot parts, with the westerly remainder of the section then divided into four tracts, using the same alphabetical designation as above, with Tract A being to the north and Tract D to the south. Thus, the quarter corner must be at 2,640 feet from the east corner, and the sixteenth corner must be at 1,320 feet from the quarter corner. The only exception is if there is a platted distance call on an exterior township boundary plat. Then proration applies, based on the platted distance of an official survey and the existing field distance.
(2) For the north tier of sections in a township, the quarter corner positions must be established at half the distance and on line between the section corner positions. The sixteenth corner positions must be established thereafter at their respective midpoint positions. The entire section is then defined by aliquot parts.
(3) The only instance in which the east, north and south tiers of sections are not platted into aliquot parts is if the east, north or south section line has been established as a correction line. The tract designation, as in (b)(1) of this section, is then applicable, except that the northeastern tract will be designated Tract A and the alphabetical designation continued counterclockwise. Special survey instructions for the correction line will be issued by the division.
History: Eff. 3/27/80, Register 73
Authority: AS 38.04.045
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Last modified 7/05/2006