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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> Table 3-4: Spoil Spring Water Quality Monitoring During Report Period <br /> EQUIS Site Name Site Name Water Quality Frequency <br /> 3031 303-1 2 <br /> 3032 303-2 0 <br /> 3033 393-3 0 <br /> 3.5 Natural Spring Monitoring <br /> As shown on Table 3-5, Two natural springs, SW-1 and SW2, located over previously mined <br /> areas in the Southwest Mining District, typically require semiannual monitoring. Prior to mining, <br /> SW-1 typically flowed throughout the year, while SW2 flows were sporadic. In recent years flows <br /> at SW-1 have been minor, and in the case of SW-2, non-existent. The natural springs are <br /> monitored for field parameters, which include flow, temperature, pH, and conductivity, as well as <br /> TDS, TSS, dissolved calcium, dissolved magnesium, dissolved sodium, bicarbonate, carbonate, <br /> sulfate, total recoverable cadmium, total recoverable mercury, total recoverable selenium, total <br /> recoverable silver, total recoverable iron, total recoverable manganese, total recoverable <br /> molybdenum, total recoverable zinc, nitrate and nitrite, ammonia, and orthophosphorus. No flow <br /> was observed at SW-1 and SW-2 during the report period. <br /> Table 3-5: Natural Spring Water Quality Monitoring During Report Period <br /> EQUIS Site Name Site Name Water Quality Frequency <br /> SW1 SW-1 0 <br /> SW=2 SW-2 0 <br /> In April 2016, a spring and seep survey was also conducted in the northern mining district to <br /> identify potential discharges to Fish Creek. No new or significant springs were identified in 2016. <br /> The northern mining district is located within the Twentymile Park Syncline. The predominant <br /> Iithologic unit nearest the surface and occupying most of the basin is the Lewis Shale, which can <br /> be upwards of 700 feet thick. The lack of significant bedding planes, faulting, or fracture zones in <br /> this area may account for the lack of springs in the central portion of this basin. <br /> 25 <br />