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Middle Creek: was historically undermined and subsided by TCC's mining of the 2 through 6 RT. No ponds <br />were formed over the mined out panels. Mining in 6 RT was completed in 2000. No significant changes to the <br />creek channel were noted in 2006. <br />5.0 SUMMARY AND CONCLUSIONS <br />Overall, no significant hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted during <br />2006. See discussion below, summarizing data assessments. <br />Water Wells: Water levels monitored in the Twentymile Wadge Overburden walls wells remained stable and <br />compazable to previously collected data, and no significant water quality influences were evident from data <br />obtained during 2006. <br />Similarily, Twentymile Sandstone wells remained stable and comparable to previously collected data, and no <br />significant water quality influences were evident from data obtained during 2006. Localized dewatering of the <br />Trout Creek Sandstone appears evident in the vicinity of the TCC potable water well 001-83-106 (Figure 18), <br />although the level stabilized in 2000, and continues to be stable through 2006. The historical declining water <br />level trend at well001-83-107 (Figure 19), continued in 2006. This decline may be attributable to the pumping of <br />well 001-83-106. Well monitoring at 95M001 (Figure 20) indicated a continuing decline in water levels which <br />began in 1997, and appears to have stabilized in 2003. No significant inflows from the Trout Creek formation <br />into the mine workings have been encountered to explain this difference in potentiometric surface or to suggest <br />that dewatering of the formation is directly attributable to mining activities. No readily apparent water quality <br />impacts associated with mining are noted for the Trout Creek Sandstone aquifer based upon data collected during <br />2006. <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 <br />historic water level declines corresponding to mining activity. Water levels in these wells subsequently stabilized, <br />exhibiting only seasonal tuctuations. Two springs (SW-1 and SW-2) are monitored in the same vicinity as <br />91M001 and 91M004. Minor flow was detected in SW-2 during 2006. The Ashley well was undermined in <br />1999 and exhibited water level declines corresponding to mining activity. This well appeared to be recovering in <br />2000 ,continuing through 2006. <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 32) stabilized in 2004, and appears to be increasing again <br />through the end of 2006. <br />No unusual observations are noted with respect to Fish Creek alluvium groundwater levels. The general water <br />level decline noted in well 006-AY-1 (Figure 34) since 1995, appears to continue in 2006. Overall, fluctuations <br />at this well are insignificant. No other notable water level observations aze apparent based upon review of the <br />2006 data. Field conductivity readings at this well appeaz stable over the last few years. Two new alluvial wells <br />(AVF-13 and AVF-14) were installed in August 2001, and one (AVF-15) in June 2002. The only unusual <br />16 <br />