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The TDS of water in backfill wells GD-3, GF-5, and GF-11 are somewhat higher <br />but similar to those of the native aquifers in these areas. TDS for GF-5 is approximately <br />1.5 times the pre-mine value. TDS for backfill well GF-7 has been much higher than the <br />naturally observed concentrations but reduced in 1996. Additional monitoring will be <br />needed to determine whether the TDS in backfill well GF-7 is declining to the pre-mine <br />level. It is likely that the TDS will probably be higher for several years before returning to <br />pre-mine concentrations. Major constituent concentration in water in this well has started <br />to decline. The water quality in QR wells GD-2 and GF-6 has been only slightly affected, <br />if any, by the upgradient mining. The last few years TDS values for well GE-1 are higher <br />than earlier values. These changes are within natural variations and probably not caused <br />by mining. Concentrations have been fairly steady after the increase indicating that a trend <br />does not exist. The remainder of the QR wells are located east of present mining activities <br />and could not have been affected. <br />The water quality in the four HI aquifer wells, GB-5, GE-2 and GP-3, which are <br />close to active mining, have not been influenced by the mining. TDS has slightly increased <br />during the last few years at well GF~. This increase may be due to natural variations within <br />the aquifer. Well GB-5 has experienced an overall decline in TDS for the last few years. <br />The remainder of the HI wells east of the areas mined have not 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 east of the mining and, therefore, observed changes in water quality in these <br />6-3 <br />