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slightly affected, if at all, by the upgradient mining. The 2000 TDS values for well GE-1 • <br />declined to close to their pre 1990's values. These changes are within natural variations <br />and may or may not be caused by mining. The remainder of the QR wells are located <br />away from present mining activities and could not have been affected, with the exception <br />of well GP-6 near the F pit. The mining at the F pit has not been long enough to affect the <br />water quality in QR well GP-6. <br />The water quality in HI aquifer wells GB-5 and GP-3, which are close to the <br />redaimed A pit, has not been influenced by mining. TDS has slightly increased during the <br />last few years at wells GE-2 and GF~. This small increase may be due to mining but is <br />within natural variations for this aquifer. The water quality in HI well GMP-1 may have <br />been slightly affected by mining, but it's concentrations are within the range of natural <br />concentrations. The water quality in HI well GC-1, downgradient of the mining in this area, .. • <br />has not been affected. The remainder of the HI wells east of the areas mined have not <br />been affected. <br />The TDS plot of the 3rd White Sandstone well GB-2 indicates it has probably not <br />been affected by mining, and changes are within natural variations for this aquifer. Mining <br />could have caused concentrations to vary in 3rd White Sandstone well GE-3 but the <br />variations observed are also within natural variation. The 3rd White Sandstone wells GC-2 <br />and GP-9 are downgradient of mining starting in 2000 and changes in water quality in <br />these wells in 2000 is similar to previous natural changes. Increases in TDS in 3rd White <br />Sandstone well P-8 were large in 1996 through 2000 and could be due to upgradient <br />mining. The magnitude and timing of this increase makes it likely that it was caused by <br />upgradient mining in the A pit. • <br />6-4 <br />