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• 9) appears to have continued during 2000. This trend may be related to localized dewatering of the formation as <br />a result of mining activities in the vicinity. The marked decline in water level noted in 1999, in wells 93M001 <br />(Figure 13) and 93M003 (Figure IS), cortesponding to longwall mining in the East Mining District, was noted to <br />moderate slightly in 2000. No significant water quality degradation is noted for [he Wadge Overburden <br />formation as a result of evaluating data collected during 2000. <br />Water levels monitored in the Twentymile Sandstone wells remained stable and comparable to previously <br />collected data. No significant water quality influences are noted to be evident in field data obtained during 2000. <br />Localized dewatering of the Trout Creek Sandstone appears evident in the vicinity of well 001-83-106 (Figure <br />29), although the level seems to be recovering slightly in 2000. The historical declining water level trend at well <br />001-83-107 (Figure 30), which appeared [o be leveling off in 1999, now seems to be continuing in 2000. This <br />decline may be attributable to the pumping of well 001-83-106. Well monitoring efforts at 96M001 (Figure 31) <br />during 2000 yielded water levels comparable to those previously documented at well FCM #2. Water quality <br />characteristics recorded at thts site aze also comparable to those previously defined for well FCM #2. 7'he wafer <br />levels returned by [his site and by well FCM #2 during 2000 are noted to be markedly lower than levels <br />previously returned from well 006-83-48C. No inflows from the Trout Creek formation into the mine workings <br />have been encountered to explain this difference in poten[iometric surface or to suggest [hat dewatering of the <br />formation is directly attributable to mining activities. No readily apparent water quality impacts associated with <br />mining are noted for the Trout Creek Sandstone aquifer based upon data collected during 2000. <br />• Mining related dewatering impacts are noted for the Fish Creek sandstone wells 91M001 and 91M004 (Figure <br />40), and the Ashley wel I (Figure 41). Wells 91 M001 and 91 M004 were undermined in 1995 and exhibited water <br />level declines corresponding to mining activity. Both wells appear to be stabilizing in 2000. The Ashley well <br />was undermined in 1999 and exhibited water level declines corresponding to mining activity. This well appears <br />to be recovering in 2000. Two springs are monitored in the same vicinity. SWl (Table 62) did not flow during <br />[his period, but SW2 (Table 63) was recorded as flowing in November, March, and May. TCC will continue to <br />monitor these locations in 2000. <br />No unusual observations are noted with respect to Foidel Creek alluvium groundwater levels. The historical <br />increasing conductivity trend in well 001-5-5 (Figure 46) appears to be continuing In 2000. Elevated TDS <br />concentrations previously documented at Foidel Creek alluvium at well 008-AV-2 (Figure 61) appear to be <br />stabilizing. TCC will continue [o carefully monitor the direction of this trend. <br />No unusual observations are noted with respect to Fish Creek alluvium groundwater levels. The water level <br />decline noted in well 006-AY-I (Figure 56) since 1995, which appeared to level off in 1999, seems to have <br />resumed in 2000. Overall, fluctuations at this well are insignificant. No other notable water level observations <br />are apparent based upon review of the 2000 data. The gradual increase in the field conductivity continued in <br />2000, however, the fluctuation in individual readings over [he year has stabilized. TCC will continue to monitor <br />. this trend. <br />14 <br />