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Perhaps the only exception is Well CW-S2W-4W, which shows an increase in TDS concentration • <br />accompanied by an increase in alkalinity. <br />There is some suggestion of seasonal variability in the Wa dge Coal; with the exception of <br />bicarbonate ions, major ions are ino st concentrated in the spring (Figure 7-4). However, <br />since there is only one value for spring and winter, this relationship cannot be <br />considered conclusive. <br />Wolf Creek Coal Aquifer. Four wells have been sampled to provide water chemistry data for <br />the Wolf Creek Coal: GW-S2W-2WC, -3WC, -4WC, and -17WC. Since it is not used locally as <br />a water source, less emphasis has been placed on water quality monitoring of this aquifer. <br />Consequently, less water quality information exists for the Wolf Creek Coal than the <br />aquifers previously discussed. Peabody does not currently monitor the Wolf Creek Coal for <br />water chemistry. <br />As with equivalent wells completed in the Overburden and Wedge Coal (Wells GW-52W-20V and <br />-2W), Wolf Creek Coal Well CW-S2W-2WC has water level data from after December, 1981 that <br />was considered erroneous due to suspected well failure. Again, a careful comparison of • <br />water quality data collected before and after well failure has detected no significant <br />difference in water chemistry, so all chemical data for Well CW-S2W-2WC have been included <br />in the data base used For tfie analyses below. <br />Table 7-18, a summary of percent milliequivalent values for the Wolf Creek Coal aquifer, <br />shows that water type varies in the Wolf Creek Coal. Overall, the aquifer is a <br />bicarbonate water with mixed cations. Well GW-S2W-2WC is strongly a Na+K-HC03 water type, <br />and CW-52W-3WC is a Na+K-504HC03 water. Wells GW-52W-4WC and -17WC both have mixed <br />cations and are bicarbonate sulfate and bicarbonate waters, respectively. <br />The Wolf Creek Coal aquifer is slightly alkaline, with pH values ranging from 7.00 to <br />8.60, and an average of 7.54 (Table 7-19). With an average hardness of 322.77, the Wolf <br />~ Creek Coal aquifer is classified as very hard. Total dissolved solids concentrations for <br />the aquifer range from 484 to 2,636 mg/1, with a mean of 843 mg/1. The highest TDS <br />concentrations were measured at GW-52W-3WC, and the lowest TDS value was recorded at (Yell <br />CWW-52W-17WC. Detectable concentrations of the following minor constituents were <br />measured: A1, Ba, B, Cd, Cr, Cu, F, Fe, Pb, Mn, Hg, Mo, Ni, Se, and Zn. All minor • <br />52 <br />