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Total Dissolved Solids <br />Total Dissolved Solids (TDS) concentrations (Figure 6) in Trout Creek exhibit an <br />expected pattern. As stream flow passes the mine, TDS levels increase while adjacent to the <br />mined areas and then begin to decline downstream due to inflow from undisturbed lands <br />below the active mine. Peak TDS levels in Trout Creek adjacent to the mine occur in early <br />spring prior to the period of peak flow. This is caused by the spring runoff from the portion of <br />the watershed in which the Edna Mine is located. Although TDS concentrations in the mine <br />runoff may be quite high when compazed to concentrations occurring above the mine, <br />generally the mine runoff is small relative to Trout Creek's total flow. Therefore, a significant <br />increase in Trout Creek TDS levels is observed only during the initial stages of spring runoff. <br />A comparison of the TDS and Flow indicates that TDS concentrations appear to be directly <br />related to flow volume. <br />The dilution of TDS concentrations in downstream flow for the past decade has not <br />been as pronounced as in previous decade. Beginning in 1990, mining and reclamation <br />occurred in close proximity to TR-C. As such, dilution of TDS concentrations probably <br />occurs farther downstream of TR-D as runoff from undisturbed areas enters into Trout Creek. <br />Although elevated TDS concentrations have moved downstream in conjunction with mining <br />and reclamation activities, all values for TDS aze consistent with the probable hydrologic <br />consequences projections. TDS concentrations exhibited the same trends in 2006 as found <br />during previous years monitoring. TDS concentrations aze provided in tabular format in <br />Appendix A. <br />u <br />