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QR aquifer near well GD-2 has not been significantly affected by the upgradient backfill <br /> aquifer water quality. Sulfate concentrations had been fairly stable in the last few years in <br /> well GE-1 after a gradual rising trend for several years. The 1999 value shows a large <br /> decline, which needs to be confirmed prior to giving it any significance. Figure 8-12 also <br /> presents sulfate concentrations for QR wells. This figure shows that sulfate concentrations <br /> in backfill well GF-11, which is upgradient of QR well GF-6, increased after the large decline <br /> in 1996. The 1998 and 1999 values are above the earlier peak values, showing increased <br /> sulfate concentration as the water level rises to a new high and the field pH slightly <br /> declines in this backfill aquifer. The sulfate concentrations have gradually declined in the <br /> last five years in well GF-6, downgradient of well GF-11. Sulfate concentrations for the last <br /> several years have also been relatively steady in QR wells GP-5 and GP-6. As expected, <br /> the sulfate concentrations are greater in downgradient well GP-5. The sulfate values for • <br /> eastern QR well GP-1 have remained low and steady through 1999. <br /> Figure B-13 presents the sulfate concentrations for KLM aquifer wells GF-3, GP-2, <br /> GP-4 and GP-8. Steady sulfate concentrations for the last few years have existed in well <br /> GF-3. Sulfate concentrations in eastern wells GP-2 and GP-8 vary significantly but should <br /> be natural due to their location in the eastern portion of the Trapper permit area. The <br /> 1999 value for well GP-2 indicates a significant decline. A significant decline in sulfate <br /> concentration had occurred in 1995 and 1996 in well GP-4 with the last three years <br /> showing a gradual increase. <br /> Sulfate concentrations for the HI aquifer wells are presented in Figures B-14 and 13- <br /> 15. The sulfate concentration in wells in the HI aquifer wells in Figure B-14 are fairly <br /> similar except for the values in backfill well GF-7, which are substantially greater than . <br /> 3-6 <br />