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Wadge Coal. Wells 16-W and 17-Y are in direct hydraulic communication with the Wadge • <br />Impoundment (002 pond) and showed a significant decline in water levels in the winter of <br />86/87, corresponding with the low level in that pond caused by pumping water for the truck <br />cash system, pumping eater for dust suppression, and low runoff. Normal eater levels <br />returned as the impoundment refilled in the spring. Pater levels since the winter of <br />86/87 have not dropped as significantly during the winter months due to better management <br />of water usage from the Madge Impoundment. In the past, water was continuously siphoned <br />from the Yadge Impoundment to the truck wash holding pond. Beginning in the winter of <br />87/88, the water is now pumped upon demand instead of continuously siphoned. Water <br />Levels at Yell 41-W have generally increased the past four years. This is likely a result <br />of an increase in the localized available recharge area of the Wadge coal as a result of <br />stripping topsoil upgradient of these cells, along with the exposed coal seam in the pit <br />upgradient of the wells, which allows eater collecting in the loner end of the pit to <br />recharge the coal seam. Water levels at Yell 42-W slowly declined beginning in the summer <br />of 1986 (likely due to dewatering caused by the adjacent pit), but have slightly increased <br />beginning in the fall of 1989, possibly due to bac kfilling of this pit and subsequent <br />resaturation. Well 19-V exhibits normal seasonal variations. <br /> • <br />Yolf Creek Overburden/Wedge Underburden. Yells 2-U, 7-WCO, and 37-WCO, all exhibit normal <br />seasonal variations. Nell 6-U has historically shown a general increase in water level <br />until [he summer of 1986, likely due to sloe recharge from the adjacent Yadge Impoundment. <br />Hydraulic connection is further suggested by the seasonal decline in ground water levels <br />as levels in the Wedge Impoundment decline from June through February each year. Water <br />levels at WeLI b-U have shown a general decrease (approximately three feet) since the <br />summer of 1986. Water levels at Well 11-U have slowly increased over the years, likely <br />due to slow recharge from the PeaCOCO pond immediately upgradient of the well. In <br />addition, a leaky coupling was fixed at 11-U on 7/31/87, which caused an increase in <br />pressure readings for this flowing well. Wells 8-U and 8P1-U have shown gradual declines <br />in water levels for the past several years, likely due to below normal precipitation <br />during the last feu years. <br />Wolf Lreek Coal. Wells 10-WC, 14 -YC, 15-WC and 37-WC all showed normal seasonal <br />variations with generally declining water levels since 1986. This decline may be <br />attributed to (over than normal snowmelt runoff and, in part, to deuatering from the <br />adjacent mine pit. Yell 14-VC, however, has not exhibited the sort of decline as • <br />previously mentioned, and its water levels measured in 1992 exhibited normal seasonal <br />4 <br />