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Page 8 <br /> <br />In Oak Creek, the TSS concentrations also showed increases but not as <br />dramatic as Trout Creek. The concentrations increased from 10-30 mg/1 <br />during baseflow to 320-390 mg/1 during snowmelt runoff. These values are <br />similar to past year's results. These concentrations are suprisingly low <br />since Oak Creek also underwent major channel changes. The Oak Creek <br />snowmelt runoff occurred 3-4 weeks earlier due to its source being at a <br />lower elevation and it is believed that the samples did not catch the peak <br />period. <br />Major ?ons (Ca, Mg, ^Ia, SO ^In HC~ ) <br />- -4- -3= -3 <br />Calcium is the dominant cation in Trout Creek with magnesium and <br />sodium found in lesser concentrations. Their relative proportions change <br />only slightly between the sampling points although concentrations increase <br />downstream (as expected from the TDS trends). Upstream of the mine on <br />Trout Creek, Bicarbonate is the major anion followed by sulfate and <br />nitrate. Downstream however, sulfate concentrations increase more rapidly <br />than the others and it becomes the major anion (during high flows in <br />spring, the sulfate increases are diluted sufficiently so that bicarbonate <br />is the major anion alone the creek). The alluvial well trends follow the <br />stream trends as they did for TDS. It is notable that the results at well <br />TR-1 look more like the downstream results at TR-D than any of the other <br />wells. The high sulfate concentrations at TR-1 look very much like an <br />effect from mine drainage, although as described before, the well's <br />location makes it unlikely that the effect is caused by the Edna Mine. <br />The spoils we 11 cations also showed calcium dominant while sulfate was <br />