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5.0 SUMMARY AND CONCLUSIONS <br />No significant gm scant hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted during 2018. <br />See discussion below, summarizing data assessments. <br />Water Wells: Water levels monitored in the Twentymile Wadge Overburden wells remained stable and <br />comparable to previously collected data, and no significant water quality influences were evident from data <br />obtained during 2018. <br />Twentymile Sandstone wells remained stable and comparable to previously collected data, and no significant <br />water quality influences were evident from data obtained during 2018. Localized dewatering of the Trout Creek <br />Sandstone appears evident in the vicinity of the TC potable water well 001-83-106 (Figure 18), although the level <br />stabilized in 2000, and continues to be stable through 2018. The historical declining water level trend at well <br />001-83-107 (Figure 19), continued in 2018. This decline may be attributable to the pumping of well 001-83-106. <br />Well monitoring at 95M001 (Figure 20) indicated a continuing decline in water levels which began in 1997, and <br />appears to have stabilized in 2003. No significant inflows from the Trout Creek formation into the mine <br />workings have been encountered to explain this difference in water level or to suggest that 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 2018. <br />Mining related dewatering impacts were noted for the Fish Creek sandstone wells 91 M001 and 91M004 (Figure <br />26), and the Ashley well (Figure 27). Wells 91 M001 and 91 M004 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, although neither SW -1 nor SW -2 flowed in 2018. 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 2018. <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) stabilized in 2004, and appears to be remaining stable <br />through the end of 2018. <br />No unusual observations are noted with respect to Fish Creek alluvium groundwater levels. The general water <br />level stability noted in well 006 -AY -1 (Figure 34) since 1995, appears to continue in 2018. Overall, fluctuations <br />at this well are insignificant. No other notable water level observations are apparent based upon review of the <br />2018 data. Field conductivity readings at this well appear stable over the last few years. <br />Surface Water: 2018 was a low runoff year for Routt County. Flows on Foidel Creek, Fish Creek, and Trout <br />Creek were lower in comparison to the normal flows. TC is still working to develop stream rating curves for the <br />surface monitoring locations. No new flow meters were installed in 2018. TC implemented in house staff for <br />stream gaging during 2017. O <br />1R <br />