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have overall been steady in well GF -11 for the last seven years after declining from a peak. Sulfate <br />concentrations have overall increased during 2006 through 2013 in well GMP -1. Sulfate <br />concentrations in well GF -7 were variable but overall gradually declined for the last few years to a <br />level 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 seem <br />to have affected the SAR values at this site. Sodium values at well GF -7 have varied significantly <br />but, overall, have 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 2013 radium 226 concentrations have been small and the <br />variations in radium 226 concentrations are thought to be natural. <br />6.2 SURFACE WATER <br />Peak flows for the surface water sites at Trapper Mine in 2013 were generally early in the <br />year and lower than expected for near average precipitation year. The precipitation in 2013 was 16.5 <br />inches, or at the 36 -year average for the Trapper Project of 16.49 inches. The previous seven years of <br />annual precipitation to 2005 had been below normal precipitation prior to the larger precipitation in <br />2005 through 2011, then the very low precipitation in 2012 and near normal precipitation in 2013. <br />Trapper Mining Company 6 -5 <br />2013 Annual Report <br />