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Page 5 <br /> <br />eater Quality <br />Total Dissolved Solids <br />Total Dissolved Solids (TDS) concentrations in Oak Creek showed <br />somewhat lower concentrations than previous years. This is probably due to <br />dilution from the high runoff from snowmelt. Concentrations shoared little <br />variation across the mine and fell within the range of 300 to 600 mg/1 <br />typical from previous years (Appendix 4). Trout Creek TDS concentrations <br />increased downstream in a pattern similar to previous years. The <br />intermediate station at TR-H showed concentrations higher than 1993 but <br />consistent with the baseline samples and the difference between TR-B and <br />the downstream station, TR-D, was similar to previous results (Appendix 4). <br />The TDS concentrations in the Trout Creek alluvial wells seems to be <br />most affected by the well's spacing between the stream and the mine. That <br />is, those close to the stream shovr results like the stream and those close <br />to the spoils show quality similar to the drainage from the spoils. The <br />unusual well is TR-1 which is above any drainage from the mine but shows <br />the highest TDS levels. The reason for this is unknown. lJhatever the <br />cause, the well's location above the mine and its discharge points should <br />rule out mining effects as the cause of the unusual results. i~ell TR-i.5 <br />showed a decreasing TDS concentration from late 1982 into 1993 but in 1994 <br />appears to be stabilizing or unchanging. The drop may have been caused by <br />a change in farming or irrigation on the adjacent hay field. <br />The spoils well samples had TDS concentrations of around 3400 mg/1 to <br />3600 mg/1. This concentration is higher than the concentration in NPDES <br />discharge point 002 (averaging about 1300 mg/1) which includes the spoils <br />