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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> discharge point in accordance with the requirements set forth under CDPS Permit No. CO- <br /> 0042161. No mine water was discharged through this point in 2020. Site 7 (Area #1 Pit) receives <br /> dewatering water from wells located at the former Fish Creek vent shaft in the old Western Mining <br /> District (WMD) and the 10RT well located in the old Eastern Mining District (EMD). The Pit <br /> supplies water to the wash plant, however if it overflows, it runs through site 7 to Pond D, and <br /> subsequently through CDPS Outfall 005A to Foidel Creek. Site 7 requires quarterly analyses <br /> when flowing per DRMS Permit No. C-82-056. Site 7 discharged during the first quarter of 2021. <br /> Outfall 005A requires weekly, twice monthly, monthly, and quarterly water quality sampling when <br /> flowing, under CDPS Permit CO-0027154. There were no exceedances of the CDPS permit limits <br /> at Outfall 005A during these quarters. <br /> 5.0 SUMMARY AND CONCLUSIONS <br /> No significant hydrology impacts, attributable to activities at the Foidel Creek Mine, were noted <br /> during 2021. See discussion below, summarizing data assessments. <br /> Groundwater: <br /> 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 <br /> from data obtained during 2021. <br /> Twentymile Sandstone wells remained stable and comparable to previously collected data, and <br /> no significant water quality influences were evident from data obtained during 2021. The mines <br /> use of potable supply well 001-83-106 has declined over the last couple of years and the water <br /> table in the Trout Creek Sandstone in this area has begun to return (Figure 22). The historical <br /> declining water level trend at well 001-83-107 (Figure 23), has stabilized. Well monitoring at <br /> 95M001 (Figure 24) indicated a continuing decline in water levels which began in 1997 and <br /> appears to be stabilizing. 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 <br /> dewatering of the formation is directly attributable to mining activities. No readily apparent water <br /> quality impacts associated with mining are noted for the Trout Creek Sandstone aquifer based <br /> upon data collected during 2021. <br /> 27 <br />