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backfill aquifer. The previous TDS values and fluctuations in well GMP -1 are similar to those in <br />well GC -1, which had to be natural until mining reached this area the last few years. The recent <br />higher TDS values in well GMP -1 are likely caused by the upgradient mining. A gradual rise in the <br />backfill water level in this area had occurred the last several years. The overall TDS concentrations <br />in well GC -1 in 2015 are similar to values that existed prior to mining in this area. The 2006 <br />through 2009 monitoring indicates the 2005 increases were not representative of large portions of <br />the aquifer in this area. TDS concentrations in HI aquifer well GP -3, further downgradient of well <br />GMP -1, have overall been steady for the period of observation. TDS concentrations in eastern wells <br />have varied, showing that TDS varies naturally over a large range in this aquifer. Fluctuations <br />observed in wells GC -1 and GP -7 except for the last few years must be natural due to their location. <br />The TDS in the new HI aquifer well in the northeast corner of the Trapper permit area has a higher <br />concentration than other HI wells in this area. The flow in the HI aquifer to well GLEV-3 would be <br />from the southeast to the northwest and therefore concentrations in well GLEV-3 should be natural. <br />Figure B-6 presents the TDS for 3rd White Sandstone wells GC -2, GP -9 and P-8. <br />Concentrations in each of these wells have been fairly steady for the last few years. The TDS for the <br />previous sixteen years for well P-8 shows fairly steady concentrations prior to a large increase in <br />1995 over three years to a value of approximately 4000 mg/l. The 2015 TDS concentrations in well <br />P-8 were steady. The increase in well P-8 is above the levels expected for the 3rd White Sandstone <br />and is likely due to the upgradient mining based on the timing and magnitude of the increase. <br />However, some of this higher level could be natural based on natural large concentrations observed <br />in 2nd White Sandstone well P-5. Concentrations are expected to decline in the future if the increase <br />is due to upgradient mining. <br />Trapper Mining Company 3-3 <br />2015 Annual Report <br />