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The increase of water use resulted in the higher conductivities <br /> since 1985 shown on Figure B-8. The 1989 values have been fairly <br /> steady. <br /> Wells GD2 and GD3 monitor the OR aquifer and the backfill <br /> material where the OR coal was mined upgradient of well GD2 in the <br /> Derringer Pit area. Figure B-9 presents the field conductivity <br /> data for well GD2. Conductivities for well GD2 have remained <br /> fairly steady the last seven years The backfill well GD3 was <br /> installed in July 1988 so only a very few data points are <br /> available to plot. Figure B-10 presents the field conductivity <br /> data for well GD3. The conductivity from well GD3 has been steady <br /> in 1989. The mining upgradient of well GD2 has not affected <br /> conductivities in this area of the OR aquifer. Any changes are <br /> thought to be within the range of natural fluctuations. <br /> The OR, HI and Second White and Third White Sandstone <br /> aquifers are monitored at the GE well site. Well GEI is completed <br /> in the OR aquifer . Figure B-11 presents a fairly steady plot of <br /> conductivities except for the last two measurements which show an <br /> increasing trend. Additional monitoring with the time is needed <br /> to determine whether a significant rising trend is occurring in <br /> water from well GE2 (see Fig . B-12) . Well GE3 shows some of the <br /> slight increase in concentrations for the Second and Third White <br /> Sandstone aquifers at the GE site since 1995, but with more <br /> scatter in the data (see Fig . B-13) . This well is more <br /> susceptible to changes because these sandstone aquifers are <br /> . shallower . A greater natural variation in the conductivities from <br /> 3-3 <br />