2015-03-16_REPORT - C1981010 - Laserfiche WebLink

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in well P -8 had overall have been at similar levels for the last several years. Concentrations have overall been steady in well GF -11 for the last eight years after declining from a peak. Sulfate concentrations have overall increased during 2006 through 2014 in well GMP -1. Sulfate concentrations in well GF -7 were variable but overall gradually declined for the last several years to a level less than its maximum level in the early 1990's. Sulfate in wells GD -3, GF -7, GMP -1, GF -11 and P -8 have likely been affected by mining while the remainder of the increases could be from natural variation, mining or a combination of both. The pH values for all of the Trapper wells are within the range of natural values for these aquifers. The pH values for the four backfill wells are within the range observed in the other aquifers. High SAR values are naturally common in the Trapper ground water. Mining does not seem to have affected the SAR values at this site. Sodium values at well GF -7 have varied significantly but, overall, have been fairly steady over the last few years. The minor constituent variations have been erratic. No changes in these constituents are thought to be attributed to mining. The 2014 radium 226 concentrations have been small and the variations in radium 226 concentrations are thought to be natural. 6.2 SURFACE WATER Peak flows for the surface water sites at Trapper Mine in 2014 were generally early in the year and lower than expected for the slightly above average precipitation year. The precipitation in 2014 was 17.9 inches, or slightly above the 36 -year average for the Trapper Project of 16.49 inches. The previous seven years of annual precipitation to 2005 had been below normal precipitation prior to the larger precipitation in 2005 through 2011, then the very low precipitation in 2012, the near Trapper Mining Company 6 -5 2014 Annual Report