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r,l ~,.-" c (\ '~ WELL LOCATION In this report, the locations of wells are based on the U.S. Bureau of Land Management system of land subdivision (fig. 2). The local wel i number locates a well within a lO-acre tract using the U.S. Bureau of Land Management system of land subdivision. The components of the local well number proceed from the larg- est to the smallest land subdivisions. This is in contrast to the legal descrip- tion, which proceeds from the smallest to the largest land subdivision. The largest subdivision is the survey. The northern High Plains of Colorado is governed by the Sixth Principal Meridian Survey (S), as shown in figure 2A. The first letter of the well location designates the survey. A survey is sUbdivided into four quadrants formed by the intersection of the basel ine and the principal meridian. The second letter of the well location des- ignates the quadrant: A indicates the northeast quadrant, B the northwest, C the southwest, and D the southeast. A quadrant is subdivided in the north-south direction and is subdivided in the east-west direction every 6 mi by first numeral of the we1 I location designates the township designates the range. every 6 mi by tOw~ships ranges (fig. 23). The and the second numeral The 36-mi2 area described by the township and range designation is subdivided into l-mi2 areas called sections. The sections are numbered sequentially in the manner shown in figure 23. The third number of the well location designates the section. The section, which contains 640 acres, is subdivided into quarter sections. The l60-acre area is designated by the first letter following the section: A in- dicates the northeast quarter, B the northwest, C the southwest, and D the south- east. The quarter section is subdivided into quarter-quarter sections. The 40-acre area is designated in the same manner by the second letter following the section. The quarter-quarter section is subdivided into quarter-quarter-quarter sections. The 10-acre area is designated in the same manner by the third letter following the section. If more than one well is located within the 10-acre tract, the wells are num- bered sequentially in the order in which they were originally inventoried. If this number is necessary, it will follow the three-letter designation. 3 ',} L;