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<br />EFFLUENT MONITORING <br />1 <br /> <br />t <br /> <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br />One sediment control structure is monitored at Mine 3. In addition, Station <br />24 is located at the reclaimed area of the abandoned Middle Creek <br />underground mine. ' <br />Flows <br />The flow rate data for the effluent sites are summarized on Table 14. The <br />Historic discharge data for Station 24 is presented 1n Figure 21. <br />Discharges from thes onds are effected by seasonal variations in <br />precipitation. Ther was m y a few intermittent discharges from Station 76 <br />in 1987. The discha s from this station are generally small. The plot <br />shows the typical seasonal variation with high flows during spring runoff <br />and cessation of flow during most of the rest of the year. <br />Water Quality <br />Summaries of the water quality data for the two effluent sites are presented <br />nn Tables 22 through 25 and on Figures 22 and 23. The dissolved solids data <br />shows some typical seasonal variation: the water quality improves during <br />spring runoff. The plots also show that the discharge sites do not have any <br />detectable effect on the water quality in Middle Creek. .Pond B (Site 76) is <br />nit showing any significant long term trend. The water quality is effected <br />Icy mining because the discharges have relatively high dissolved solids <br />levels. The mean dissolved solids level for Site 24 had increased from <br />approximately 700 mg/1 to 2000 mg/1 in 1986 but returned to 1400 mg/1 in <br />1987. Since none of these sites have significant discharges during the <br />irrigation season they do not cause any significant impacts as shown by <br />Figure 23. <br />- 7 - <br />