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smaller. The late-1992 downturn corresponds With the beginning of <br />a sharp water-level increase. The backfill well GD3 decreased in <br />1993, most likely in response to increased ground-water flow. <br />Figure B-10 presents the field conductivity data for well GD3. The <br />mining upgradient of well GD2 has not affected conductivities in <br />this area of the QR aquifer. Any changes are thought to be within <br />the range of natural fluctuations. <br />Figure B-11 presents an overall gradual increasing trend of <br />conductivities for well GE1 since the late 1980's. A gradual <br />overall increase in conductivity up to 1992 occurred at well GE2 <br />followed by a decrease in 1993 (Figure B-12). Well GE3 shows <br />considerable scatter in concentrations since 1985. No apparent <br />trend exists (see Fig. B-13). This well is more susceptible to <br />changes because these sandstone aquifers are shallower. A greater <br />natural variation in the conductivities for well GE3 is expected. <br />Mining on the west side of the Trapper Mine permit area was <br />re-started in 1988. Changes in well GE3 are well within the <br />natural changes in these two sandstones and therefore no effect <br />from the B and C pit mining is seen. <br />Twenty Mile Sandstone well GF1 and U aquifer well GF2 have <br />shown very little change in field conductivity during the period <br />presented (1985 through 1993) in Figures B-14 and B-15. <br />Concentration plots with less scatter are expected from these <br />deeper aquifers. Figures B-16 and B-17 present the field <br />conductivity versus time plots for wells GF3 and GF4. Each plot <br />~~ shows no major trends in data to 1986 with a slight rise in values <br />3-3 <br />