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several years with the exception of wells GB-2 and P-8. The 1998 data for well GB-2 • <br /> shows an increasing trend. The increase is well within natural fluctuations in TDS values <br /> for the 3rd White Sandstone. Additional years of monitoring will be needed to determine <br /> whether this trend is significant. The TDS in well Fj8 has significantly increased over the <br /> (/� last three years to a value of approximately 4000 mg/I. The increase in well P-8 is above <br /> IS <br /> V" 30 the levels expected for the 3rd White Sandstone and is likely due to the upgradient mining <br /> �, based on the timino and magnitude of the increase. However, some of this higher level <br /> ,O.bo-ff- "could be natural based on natural large concentrations observed in 2nd White Sandstone <br /> M <br /> well P-5. Concentrations are expected to decline in the future if the increase is due to <br /> upgradient mining. <br /> Figure B-8 presents TDS values for 2nd White Sandstone well P-5 and shows that <br /> the concentration has been in the 2500 to 3000 mg/I range prior to mining in this area. • <br /> Natural water-quality concentrations in the 1st, 2nd and 3rd White Sandstones are <br /> expected to vary over a similar range. Figure B-8 also presents 3rd and 2nd White <br /> Sandstone wells GE-3 and 1st White Sandstone well GLUX-1, which consists of low TDS <br /> water. <br /> Figure B-9 presents the TDS concentrations versus time for alluvial wells GC-3, P-1, <br /> 1-1 and Coy. Lewis Shale well P-3 is also included in this plot due to its response to the <br /> Pyeatt alluvial system. The TDS in well P-3 had been in an overall decreasing trend for the <br /> last eight years, while the latest value shows a significant increase. TDS concentrations in <br /> Pyeatt alluvial well P-1 have varied with time as expected for a shallow ground-water <br /> system but have been steady for the last two years. These variations in water quality in <br /> well P-1 are within expected natural fluctuations for this ground-water system. <br /> 3-4 <br />