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well historigly and the natural levels in the COY alluvial well. The changes in Pyeatt alluvial <br />well P-1 are thought to be natural because they are similar to those observed prior to <br />mining in this drainage. <br />Sulfate wncentrations in wells GD-3 and GF4 were fairly steady in 2003 after <br />increasing with time, while concentrations in 2003 dedined in wells GE-2, GFli and P-8. <br />Sulfate concentrations decreased during the second half of 2003 in well GMP-1 after an <br />increase in the first half. Sulfate conoentrations in well GF7 were overall steady in 2003 at <br />a level less than its maximum level in the early 1990's. Sulfate concentrations in weft G&5 <br />were low and steady. Sulfate in wells Ga3, GF7, GMP-1, GFil and P-8 have likely been <br />affected by mining while the remainder of the increases could be from natural variation, <br />mining or a combination of both. <br />The pH values for all of the Trapper wells are within the renge of natural values for <br />these aquifers. The pH values for the four badffill wells are within the range observed in <br />the other aquifers. <br />High SAR values are naturally wmmon in the Trapper ground water. Mining does <br />not seem to have affected the SAR values at this site. <br />The decrease in caldum and magnesium concentrations in wells GI3.5 and GE-2 <br />occurred after mining in these two areas. Their decease is very abrupt which is not typigl <br />of water quality changes in ground water. The sodium concentrations in well GP-6 have <br />been at similar values since 1988 with the exception of one outlier. Sodium values at well <br />GF7 have varied significantly but, overell, have been fairly steady over the last few years. <br />6-5 <br />