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Significant changes in TDS concentrations have been observed in the alluvial wells <br />GC-3, P-1, J-1, and COY. The changes in the Flume alluvial wells had to be natural prior to <br />2000, while some of the changes in J-1 water could be due to mining. Overall, the TDS for <br />J-1 increased in 2000 but is very similar to concentrations observed in this well historically <br />and the natural levels in the COY alluvial well. The changes in Pyeatt alluvial well P-1 are <br />thought to be natural because they are similar to those observed prior to mining in this <br />drainage. <br />Sulfate concentrations in wells GD-3, GE-2, GF-4, GF-11 and P-8 have been <br />increasing with time, while concentrations in 2000 declined in well GMP-1. Sulfate <br />concentrations in well GF-7 also increased in 2000 to a level less than its maximum level in <br />the early 1990's. Sulfate concentrations in well GB-5 are generally declining. The large <br />• sulfate concentrations in well P-5 occurred prior to mining in this area and, therefore, are <br />natural. Sulfate in wells GD-3, GF-7, GMP-1, GF-11 and P-8 have likely been affected by <br />mining while the remainder of the increases could be from natural variation, mining or a <br />combination of both. <br />The pH values for all of the Trapper wells are within the range of natural values for <br />these aquifers. The pH values for the four backfill wells are within the range observed in <br />the other aquifers. <br />High SAR values are naturally common in the Trapper ground water. Mining does <br />not seem to have affected the SAR values at this site. <br />The decrease in calcium and magnesium concentrations in wells GB-5 and GE-2 <br />occurred after mining in these two areas. Their decrease is very abrupt which is not <br />• typical of water quality changes in ground water. The sodium concentrations in well GP-6 <br />6-5 <br />