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<br />00191'; <br /> <br />. <br /> <br />. <br /> <br />The largest subdivision is the survey. Northeastern Colorado is governed <br />by the Sixth Principal Meridian Survey (S) as shown in figure 2A. The first <br />letter of the well location designates the survey, in this case the Sixth. <br /> <br />A survey is subdivided into four quadrants formed by the intersection of <br />the baseline and the principal meridian. The second letter of the well <br />location designates the quadrant within the survey formed by this <br />intersection: A indicates the northeast quadrant~ B the northwest~ C the <br />southwest, and D the southeast. <br /> <br />A quadrant is subdivided in the north-south direction every 6 mi (10 km) <br />by townships and is subdivided in the east-west direction every 6 mi (10 km) <br />by ranges (fig. 2B). The first number' of the well location designates the <br />township and the second number designates the range. <br /> <br />The 36-mi2 (93-km2) area described by the township and range designation <br />is subdivided into l-mi2 (2.59-km2) areas called sections. The sections are <br />numbered sequentially in the manner shown in figure 2B. The third number of <br />the well location designates the section. <br /> <br />The section, which contains 640 acres (259 ha), is subdivided into <br />quarter sections. The 160-acre (64.8-ha) area is designated by the first <br />letter following the section number: A indicates the northeast quarter, B the <br />northwest, C the southwest, and D the southeast. The quarter section is <br />subdivided into quarter-quarter sections. The 40-acre (16-ha) area is <br />designated in the same manner by the second letter following the section. The <br />quarter-quarter section is subdivided into quarter-quarter-quarter sections. <br />The 10-acre (4.0-ha) area is designated in the same manner by the third letter <br />following the section. <br /> <br />If more than one well is located within the 10-acre (4.0-ha) tract, the <br />wells are numbered sequentially in the order in which they were originally <br />inventoried. If this sequential number is necessary, it will follow the <br />three-letter designation. <br /> <br />5 <br />