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upgradient mining. The conductivity concentrations for QR well GA ] also indicate that mining has <br />not significantly influenced water quality in this aquifer in this azea. The last three years of <br />conductivity values for well GEl indicate the well may be stabilizing or possibly decreasing from <br />an earlier increasing trend. These changes are within natural variations and probably not caused <br />by mining. Continued monitoring will define whether a long term trend exists. The remainder of <br />the QR wells are located east of present mining activities and could not have been affected. <br />The water quality in the four HI aquifer wells, GB.S, GE2, GF4, and GP3, which are close <br />to active mining, have not been influenced by the mining. Wells GBS and GE2 have both <br />experienced declines in conductivity since 1992. The remainder of the HI wells east of the areas <br />mined have not been affected. <br />The conductivity plot of the 3rd White Sandstone well GB2 indicates it has probably not <br />• been affected by mining, and changes are within natural variations for this aquifer. Mining could <br />have caused concentrations to vary in 3rd White Sandstone well GE3 but the variations observed <br />are also within natural variation. The 3rd White Sandstone wells GC2 and GP9 are east of the <br />mining and, therefore, observed changes in water quality in these wells has to be natural. Changes <br />in 3rd White Sandstone well P8 are also thought to be natural because upgradient mining has <br />occurred only during the last few years and observed variations are within pre-mining limits. <br />Significant changes in conductivity concentrations have been observed in the alluvial <br />wells GC3, Pl, J1, and Coy. The changes in the Flume alluvial wells has to be natural, while some <br />of the changes in Jl water could be due to mining. Overall, the conductivity for Jl decreased <br />during 1994. The changes in Pyeatt alluvial well P1 aze thought to be natural because they are <br />• similar to those observed prior to mining in this drainage. <br />'rk-G <br />6-3 (Revised 09/21/95) <br />