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until mining reached this area the last few years. The recent higher TDS values are likely caused by <br />'ent .The overall TDS concentrations in well GC-1 had declined for the last few <br />the upgradz mining <br />years and the 2007 values show similar levels. The 2006 and 200? monitoring indicates the 2005 <br />increases were not representative of Large portions of the aquifer in this area. TDS concentrations in <br />HI aquifer well GP-3, further downgradient of well GMP-l, have overall been steady for the period <br />of observation. TDS concentrations in eastern wells have varied, showing that TDS varies naturally <br />over a large range in this aquifer. Fluctuations observed m wells GC-1 and GP-7 except for the last <br />few years mgt be natura,t due to their location. <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 with a gradual <br />decline in well GC-2. The TDS for the last ten years for well P-8 shows fairly steady <br />concentrations after a large increase over the previous three years to a value of approximately 4000 <br />ve the levels a for the 3rd White Sandstone and is <br />mgll. The increase in well P-8 zs abo xpected <br />likely due to the upgradient mining based on the timing and magnitude of the increase. However, <br />some of this higher level could be natural based on natural large concentrations observed in 2nd <br />White Sandstone well P-5. Concentrations are expected to decline in the fitture if the increase is <br />due to upgradient mining. <br />Figure B-6 also presents TDS values for 2nd White Sandstone well P-5 and shows that the <br />concentration were in the 2500 to 3000 mg/1 range prior to mining in this area Water quality for <br />this well has nat been collected due to it being dry or nearly dry. Natural water-quality <br />concentrations in the lst, 2nd and 3rd White Sandstones are expected to vary over a similar range. <br />Figure B-7 presents the TDS concentrations versus time for alluvial wells GC-3, P-1, J-I <br />and COY. Lewis Shale -well P-3 is also included in this plot due to its response to the Pyeatt <br />Trapper Mining Company 3-3 <br />2007 Annual Report <br />