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do occur at the surface sites. Increases in iron concentration are often related to accumulation and leaching of <br />iron-bearing strata sediments during spring runoff. Some elevated iron concentrations may also be related to <br />ponding effects (e.g. increased solids in ponded samples) <br />Foidel Creek: was historically undermined and subsided by TCC's mining of the 9 Rt, 8 Rt, 7 Rt, and to a very <br />limited extent, the 6 Rt panel, and extreme eastern end of panel 12 Rt. Mining in 12 Rt was completed in 2001, <br />and subsequently sealed in September 2001. No significant changes to the creek channel were noted in 2007. <br />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 2007. <br />5.0 SUIVIMARY AND CONCLUSIONS <br />Overall, no significant hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted during <br />2007. See discussion below, summarizing data assessments. <br />Water Wells: Water levels monitored in the Twentymile Wadge Overburden wells wells remained stable and <br />comparable to previously collected data, and no significant water quality influences were evident from data <br />obtained during 2007. <br />• Similarity, Twentymile Sandstone wells remained stable and comparable to previously collected data, and no <br />significant water quality influences were evident from data obtained during 2007. 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 2007. 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 />2007. <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 fluctuations. 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 May of 2007. The Ashley well was undermined <br />in 1999 and exhibited water level declines corresponding to mining activity. This well appeared to be recovering <br />in 2000 ,continuing through 2007. <br /> <br />15 <br />