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Foidel Creek: was historically undermined and subsided by TCC's mining of the 9 Rt, 8 R[, 7 Rt, and to a very <br />limited extent, the 6 Rt panel, and extreme eastern end of panel 12 Rt. Mining in 12 R[ was completed in 2001, <br />and subsequently sealed in September 2001. No significant changes to the creek channel were noted in 2005. <br />Middle Creek: was historically undermined and subsided by TCC's mining of the 2 through 6 RT. No ponds <br />were formed over [he mined out panels. Mining in 6 RT was completed in 2000. No significant changes to the <br />creek channel were noted in 2005. <br />5.0 SUMMARY AND CONCLUSIONS <br />No significant/unexpected hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted <br />during 2005. See discussion below, summarizing data assessments. <br />Water Wells: The previously noted declining water level trend in Wadge Overburden. well 91M006 (Figure_9) <br />appears to have continued during 2005. This trend may be related to localized dewatering of the formation as a <br />result of mining activities in the vicinity. The marked decline in water level noted in 1999, in wells 93M001 <br />(Figure 13) and 93M003 before it was abandoned (Figure 15), appears to correspond to longwall mining in the <br />EMD. No significant water quality degradation is noted for the Wadge Overburden formation as a result of <br />evaluating data collected during 2005. <br />• Water levels monitored in the Twentymile Sandstone wells remained stable and comparable to previously <br />collected data, and no significant water quality influences were evident from data obtained doting 2003. <br />Localized dewatering of the Trout Creek Sandstone appears evident in [he vicinity of well 001-83-106 (Figure <br />29), although the level started recovering slightly in 1999, and continues in 2005. The historical declining water <br />level trend at we11001-83-107 (Figure 30), continued in 2005. This decline may be attributable to the pumping of <br />well 001-83-106. Well monitoring at 95M001 (Figure 31) indicated a continuing decline in water levels which <br />began in 1997. No significant inflows from the Trout Creek formation into the mine workings have been <br />encountered to explain this difference in potentiometric surface or to suggest that dewatering of the formation is <br />directly attributable to mining activities. No readily apparent water quality impacts associated with mining are <br />noted for the Trout Creek Sandstone aquifer based upon data collected during 2005. <br />Mining related dewatering impacts were noted for the Fish Creek sandstone wells 91M001 and 91M004 (Figure <br />26), and the Ashley well (Figure 27). Wells 91M001 and 91M004 were undermined in 1995 and exhibited water <br />level declines corresponding to mining activity. Water levels in these wells subsequently stabilized, exhibiting <br />only seasonal fluctuations. Two springs (SW-1 and SW-2) are monitored in the same vicinity as 91M001 and <br />91M004. No flow was detected in SW-2 during 2005. The Ashley well was undermined in 1999 and exhibited <br />water level declines corresponding to mining activity. This well appeared to be recovering in 2000, and <br />continues in 2005. TCC will continue to monitor these locations in 2006. <br />No unusual observations are noted with respect to Foidel Creek alluvium groundwater levels. The historical <br />increasing conductivity trend in well 001-S-5 (Figure 32) appears have stabilized in 2004. A trend showing a <br />14 <br />