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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> Mining related dewatering impacts were previously noted for the Fish Creek sandstone wells <br /> 91 M001 and 91 M004 (Figure 30), and the Ashley well (Figure 31). Wells 91 M001 and 91 M004 <br /> were undermined in 1995 and exhibited historic water level declines corresponding to mining <br /> activity. Water levels in these wells have subsequently stabilized, exhibiting only seasonal <br /> fluctuations. Two natural springs (SW-1 and SW-2) are monitored in the same vicinity as 91 M001 <br /> and 91 M004, although neither SW-1 nor SW-2 flowed during the report period. The Ashley well <br /> was undermined in 1999 and exhibited water level declines corresponding to mining activity. A <br /> water level could not be collected at the Ashley well during the 2021 report period. <br /> No unusual observations are noted with respect to Foidel Creek, Fish Creek, or Trout Creek <br /> alluvium groundwater levels. Water quality at the proposed point of compliance wells (008-AV-2, <br /> 008-AU-3, 008-AT-1) generally meet the agricultural use groundwater standards. The iron <br /> exceedances at well 008-AT-1 will be observed in the future. See Section 3.2 for additional <br /> discussion. <br /> Surface Water: <br /> Typical flow patterns were seen in Foidel Creek, Fish Creek, Middle Creek and Trout Creek in <br /> 2021, with spring runoff accounting for the peak flows. TC is still working to develop stream rating <br /> curves for the surface monitoring locations. No new flow meters were installed in 2021. TC <br /> implemented in house staff for stream gaging during 2017. <br /> Both Middle Creek site 29 and Foidel Creek site 900, upstream of point 29, had elevated field <br /> conductivities and TDS concentrations during the report period. It is unclear what caused this <br /> elevated reading. See Section 3.3 for additional discussion. Water quality at the other stream <br /> monitoring points was typically within the historic range observed at each of the sites and no other <br /> water quality impacts of concern were evident at the stream points during the 2021 report period. <br /> Spoil Springs: <br /> Spoil spring 303-1 (303 series). The 2012 reclamation at the Fish Creek Tipple, resulted in the <br /> loss of two smaller associated springs in the 303 series (303-2 and 303-3). Site 303-1 did not <br /> contribute a significant portion of discharge from the TC mine area and discharges from <br /> sedimentation ponds predominately occurred in conformance with applicable CDPS permit <br /> 28 <br />