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Figure B-7 presents the TDS for 3rd White Sandstone wells GB-2, GC-2, GP-9, P-8 . <br /> and 81-03A. Concentrations in each of these wells have been fairly steady for the last <br /> several years with the exception of well P-8. The 1999 data for well P-8 shows a small <br /> decrease from the 1998 values. The TDS in well P-8 has significantly increased over the <br /> last four years to a value of approximately 4000 mg/l. The increase in well P-8 is above <br /> the levels expected for the 3rd White Sandstone and is likely due to the upgradient mining <br /> based on the timing and magnitude of the increase. However, some of this higher level <br /> could be natural based on natural large concentrations observed in 2nd White Sandstone <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 ist, 2nd and 3rd White Sandstones are <br /> expected to vary over a similar range. Figure B-8 also presents 2nd and 3rd White <br /> Sandstone well 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 /> 3-1 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 has varied significantly within each of the last <br /> two years in the shallow aquifer. TDS concentrations in Pyeatt alluvial well P-1 have varied <br /> with time as expected for a shallow ground-water system but these variations are within <br /> the historical natural range. <br /> 3-4 <br />