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• at Well 17WC began in October, 1987 and has continued through 1989. Monthly water level <br />data for the Wolf Creek wells, including hydrographs, are presented in Appendix 7-2. <br />Table 7-2 summarizes the well completion information for the Wolf Creek coal wells. <br />Wells 2WC, 3EWC, and 4WC were nested in the same boring as overburden and Wadge coal wells <br />(refer to well completions, Appendix 7-1). Based on field notes and observations, wells <br />2WC and 3EWC were suspected of having leakage in the annular seals and monitoring was <br />discontinued at these two sites in 1985 and 1986, respectively. Table 7-4 is presented to <br />show those time periods for the two wells during which water level data is felt to be <br />representative of natural conditions. Wells 3WC and 17WC are single aquifer completion <br />borings and all historic data collected at these sites is believed to be valid. Well 4WC <br />is a nested completion with 40V2. The annular seal for 40V2 appears to have failed; <br />however, 4WC data do not look suspect and all historic data is included in the following <br />analysis. Monitoring at 4WC was discontinued in 1986 because mining disturbance in the <br />II-W south block is not projected to occur until 2001-2004. For the following discussion, <br />only those portions of the water level data believed to be valid wilt be interpreted and <br />used to support any conclusions. <br />• <br />C round water in the Wolf Creek occurs primarily under confined conditions. Unconfined <br />conditions would occur only in the immediate vicinity of the crop line. All the Wolf <br />Creek monitor wells show artesian head. Mean water levels in those portions of the Wolf <br />Creek coal aquifer monitored range from 18.6 feet above ground surface at Well 2WC to <br />386.4 feet below ground surface at Well 3WC. Mean artesian heads range from 53.1 feet at <br />Well 3WC to 769.6 feet at Well 2WC. The mean artesian head at Well 4WC, 63.2 feet, may be <br />somewhat in error because the annular seal is 141.5 feet above the top of the Wolf Creek <br />coal; however, there are no adjacent wells completed in the Wadge underburden and Sage <br />Creek coal to compare water levels with. Mean saturated thicknesses for the Wolf Creek <br />coal range from 15 feet to 29.6 feet in the confined portions of the aquifer monitored. <br />The large range in rvater levels for the Wolf Creek coal aquifer appears to be principally <br />a function of downgradient distances of the wells from the crop. Wells 3WC and 4WC are <br />close to the crop and exhibit artesian heads of only 53 and 63 feet. Well 2WC and 17WC <br />are approximately 8,400 feet and 6,600 feet downgradient from the crop and they show <br />artesian heads of 770 feet and 355 feet, respectively. <br />• <br />Seasonal water level changes have been measured in the Wolf Creek coal aquifer (see Table <br />17 <br />