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1 <br />wells aze plotted on Figures 8 and 9. Seasonal variation is evident in the wells. This is <br />' apparently due to flushing effect of the relatively low dissolved solids surface water which <br />rechazges the alluvial aquifers during spring runoff. The water quality of Foidel Creek alluvial <br />' wells is probably effected by the relatively high salt content of the foidel Creek water which had <br />a high conductivity of 3120 mmhos/cm at Station 900 in 1990. The conductivity of the water <br />' in the two alluvial wells did not increase in 1990, however, the dissolved solids in We11008-AV- <br />2 did increase. This was probably due to the very low stream flows since 1987. The data does <br />' not include any significant changes in the trace metals concentrations. <br />' Spoils <br />Two wells in the spoils aze monitored. They are located in the Mine 3 spoils and were installed <br />in 1985. One spoil well, 008-SP-4A has been dry since it was installed. <br />' Water Levels -The plot of the historic water levels in spoil well 008-SP-SA is presented on <br />Figure 10. The water level has a similar pattern to that of the alluvial wells: it responds rapidly <br />' to the spring runoff and then declines rapidly in the summer. <br />' Water Quality -The water quality data is summarized in Tables 12 and 13 for the spoil well. <br />The historic dissolved solids concentrations for the well is plotted on Figure 11. The dissolved <br />' solids average 3406 for the period of record. While highly variable, the dissolved solids <br />concentration does not appeaz to be increasing significantly. The water is acalcium-sulfate type <br />' with high bicarbonate and relatively low SAR. The water is higher in dissolved solids than the <br />background bedrock levels and the spoil spring dischazges. The data does not indicate any <br />' significantly high trace metals concentrations except for relatively high dissolved manganese. <br />' -4- <br />