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• The alluvial ground water in Johnson Gulch has shown an increasing trend in TDS <br /> since 1996. The 1999 Johnson Gulch alluvial ground water is still within the natural range <br /> for TDS in this aquifer. These TDS values and variations are very similar to the natural <br /> values and variations observed in Flume Gulch alluvial well, COY. <br /> Flume Gulch has two alluvial monitoring wells, GC-3 and COY. TDS concentrations <br /> have been fairly steady in well GC-3. The TDS concentrations in the COY well and <br /> historical variations in well P-1 show that the Johnson alluvial TDS concentrations are <br /> within natural alluvial concentrations in the alluvial aquifer in this area. <br /> 3.2 SULFATE <br /> Sulfate concentrations for the Twenty Mile Sandstone aquifer and the U aquifer are <br /> • presented in Figure B-10. This plot shows a significant amount of variation in the sulfate <br /> concentrations in Twenty Mile Sandstone well, GF-1, with no long-term trend. This deep <br /> aquifer would be expected to respond slowly to better recharge years. Figure B-10 also <br /> presents the plot of U aquifer well GF-2. Sulfate concentrations in well GF-2 have been <br /> steady in recent years. <br /> Figure B-11 presents the sulfate concentrations for QR wells GD-2, GD-3 and GE-1. <br /> Sulfate in backfill well GD-3 decreased significantly in 1996 and increased in 1997 through <br /> the first half of 1999. This indicates that the fluctuation in the backfill aquifer may be <br /> larger than the native QR aquifer. Future monitoring of this well will define the larger <br /> fluctuation in this backfill aquifer. Concentrations in well GD-2 have been fairy steady with <br /> a slight increase in average sulfate concentrations over the last few years versus <br /> • concentrations in the late 1980's. The sulfate concentrations in well GD-2 show that the <br /> 3-5 <br />