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• Water Quality <br />The water quality data are summarized in Tables 24 through 29 for the spoil wells. <br />The historic dissolved solids concentrations for the wells are plotted on Figure 20. The <br />field conductivity ranged from 2368 to 4220 mg/1 in 1991. The dissolved solids <br />concentrations in all wells show temporal fluctuations that most likely reflect recharge <br />events of low TDS snowmelt. The lowest TDS concentrations in the spoil groundwater <br />typically occur during the Spring snowmelt period. Dissolved solids appear to show an <br />increasing trend over time in well 026-SP-1 and alevelling-off of average dissolved <br />solids values in wells 026-SP-2 and 026-SP-3. The spoil groundwater has comparable <br />dissolved solids concentrations to most of the spoil spring discharges but much higher <br />values than in the background bedrock groundwater. The spoil groundwater is a <br />calcium-sulfate type with relatively high bicarbonate and low SAR. The data does not <br />indicate any significant changes in the trace metals concentrations. Well 026-SP-2 has <br />relatively high manganese concentrations. <br />• <br /> <br />6 - <br />