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natural levels in the COY alluvial well. The decrease in 2006 in Pyeatt alluvial well P -1 are <br />thought to be natural because they are similar to those observed prior to mining in this drainage. <br />Sulfate concentrations in wells GD -3 and GF-4 were fairly steady in 2006 after increasing <br />with time while concentrations in 2006 declined in well P -8 and were steady in well GE -2 and <br />overall declining in well GF -11. Sulfate concentrations increased during 2006 in well GMP -1 after <br />a decrease in 2005. Sulfate concentrations in well GF -7 were variable in 2006 but overall its level <br />was less than its maximum level in the early 1990's. Sulfate in wells GD -3, GF -7, GMP -1, GF -11 <br />and P -8 have likely been affected by mining while the remainder of the increases could be from <br />natural 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 backfill wells are within the range observed in the other <br />aquifers. <br />High SAR values are naturally common in the Trapper ground water. Mining does not <br />seem 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 2006 radium 226 concentrations have been small and the <br />variation in radium 226 concentrations are thought to be natural. <br />Trapper Mining Company 6 -5 <br />2006 Annual Report <br />