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Sulfate concentrations in wells GD-3 and GF-4 were fairly steady in 2005 after increasing <br />with time while concentrations in 2005 declined in well P-8 and was steady in well GE-2 and overall <br />declining in well GF-I1. Sulfate concentrations decreased during 2005 in well GMP-1 after an <br />increase in 2003. Sulfate concentrations in well GF-7 were variable in 2005 but overall its level was <br />less than its maximum level in the eazly 1990's. Sulfate in wells GD-3, GF-7, GMP-1, GF-11 and P- <br />8 have likely been affected by mining while the remainder of the increases could be from natural <br />variation, mining or a combination of both <br />The pH values for all of the Trapper wells are within the range of natural values for these <br />aquifers. The pH values for the four backfitI wells aze within the range observed in the other <br />aquifers. <br />High SAR values are naturally common in the Trapper ground water. Mining does not seem <br />• to have affected the SAR values at this site. <br />The decrease in calcium and magnesium concentrations in well GE-2 occurred after mining <br />in this area. Their decrease is very abrupt which is not typical of water quality changes in ground <br />water. The sodium concentrations in well GP-6 have been at similar values since 1988 with the <br />exception of one outlier. Sodium values at well GF-7 have varied significantly but, overall, have <br />been fairly steady over the last few years. <br />The minor constituent variations have been erratic. No changes in these constituents are <br />thought to be attributed to mining. The 2005 radium 226 concentrations have been small and the <br />variation in radium 226 concentrations are thought to be natural. <br />• <br />Trapper Mining Company <br />2005 Annual Report <br />