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concentrations in the 1st, 2nd and 3rd White Sandstones are expected to vary over a <br />similar range. Additional monitoring of well P-8 is needed to help define whether the <br />significant increase in 1996 is due to mining or to natural variations. Figure B-t3 also <br />presents 3rd and 2nd White Sandstone wells GE-3 and 1st White Sandstone well GLUX-1. <br />Figure B-9 presents the TDS concentrations versus time for alluvial wells GC-3, <br />P-1, J-1 and Coy. Lewis Shale well P-3 is also included in this plot due to its' response to <br />the Pyeatt alluvial system. The TDS in well P-3 increased from 1986 through 1988 but has <br />been gradually decreasing since 1989. TDS concentrations in Pyeatt alluvial well P-1 have <br />varied with time as expected for a shallow ground-water system. The present <br />concentrations seem to be gradually declining with time. These variations in water quality <br />in well P-1 are within expected natural fluctuations for this ground-water system. <br />The alluvial ground water in Johnson Gulch has shown TDS variations with time • <br />with a generally lower TDS in 1988, 1989 and 1990 and a higher value in 1992, 1993, 1994 <br />and 1995. The TDS values showed a general decline in well J-1 in 1996. The decrease <br />in average TDS in 1996 in Johnson Gulch is probably due to the increase in precipitation <br />in 1995 and 1996. <br />Flume Gulch has two alluvial monitoring wells, GC-3 and COY. TDS <br />concentrations have been fairly steady in well GC-3 with a minor decrease in 1996 which <br />is likely due to an increased rate of recharge. The TDS concentrations in the COY well <br />decreased in 1995 and 1996, which is a realistic decline in concentration due to better <br />recharge years. <br /> <br />3-4 <br />