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C. discussed earlier, sampling techniques were standardized in the fall of 1986 (post-1986 <br />water year) so that chemical changes as a function of sampling inconsistencies should be <br />negligible. Well GW-536-0 is located adjacent to the Wolf Creek pit. This well has shown <br />an increase of TDS from 605 mg/1 to 2,073 mg/1 and a shift from a calcium bicarbonate to a <br />magnesium sulfate type water. As discussed earlier in the ground water level section, <br />fracturing of rocks from blasting may have allowed water from different strata to move <br />into this well. This well was mined through in the fall of 1986. <br />The two wells downdip of mining in the Wedge coal seam which are sampled for water <br />quality, are CW-58 and CS-511. Both are characterized by a sodium bicarbonate type water. <br />Trends of TDS at GW-58 are not apparent, possibly for the same reasons as discussed above <br />for GW-57. Well CW-511 has had a relatively stable TDS. <br />Parameters which exceeded irrigation standards are discussed below. Well CW-57 exceeded <br />the manganese limit and well CW-511 exceeded fluoride and ~SAR limits. Neither of these <br />monitored strata is likely to be used for irrigation, however. <br />5. Wolf Creek Coal <br />Well GW-536-WC monitors water quality in the Wolf Creek coat. It was situated adjacent to <br />the mine pit and displayed a calcium sulfate type water with a relatively stable TDS since <br />1981. It was mined through in the fall of 1986. <br />6. Trout Creek Sandstone <br />Well GW-SS is used as the potable water supply for the Seneca II Mine facilities. It <br />displays a sodium sulfate type water and a TDS Lhat is increasing. Since it is unlikely ,. <br />that this aquifer is hydraulically connected with strata affected by mining, this <br />increasing TDS may be related to the continuous drawdawn of this aquifer and a possible <br />nanhomogeneous water quality to the aquifer. TDS and sulfate values exceed drinking water <br />standards though neither poses a serious health threat. <br />7. Spoils <br />Three wells monitoring water quality in the spoils are CW-525, CW-526, and CW-527. All <br />are situated in a line above the Wadga Impoundment. Well CW-525, the upper spoils well, <br />displays a magnesium sulfate type water. Well CW-526, the middle spoils well, displays a <br />calcium/magnesium sulfate type water. Well CW-527, the lower spoils well, displays a <br />~, <br />calcium sulfate type water. TDS decreases as one progresses downgradient. This is due to <br />28 <br />