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<br /> <br /> water supply well for the mine and the power plant since 1985. The <br /> increase of water use resulted in the higher conductivities since <br />.. 1985 shown on Figure B-B. The, 1989 and 1990 values have been <br /> fairly steady except the December value showed a drop. <br /> Wells GD2 and GD3 monitor the QR aquifer and the backfill <br /> material where the QR 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 eight years. The backfill well GD3 was <br /> installed in July 1988 and has been fairly steady from that time <br /> with an average around 1600 umhos/cm. A slight increase in <br /> conductivity has been observed in well GD3 with time. Figure B-10 <br />• presents the field conductivity data for well GD3. The mining <br /> upgradient of well GD2 has not affected conductivities in this <br /> area of the QR aquifer. Any changes are thought to be within the <br /> range of natural fluctuations. <br /> The QR, HI and Second White and Third White Sandstone <br /> aquifers are monitored at the GE well site. Well GE1 is completed <br /> in the QR aquifer. Figure B-11 presents a fairly steady plot of <br /> conductivities except for 1990 where there is some variability in <br /> the data. A gradual overall increase in conductivity seems to be <br /> occurring at wells GE1 and GE2 (see Figure B-12). Well GE3 shows <br /> an .overall slight increase in concentrations for the Second and <br /> Third. White Sandstone aquifers at the GE site since 1985, but with <br /> more scatter in the data (see Fig. B-13). This well is more <br /> <br /> susceptible to changes because these sandstone aquifers are <br />3-3 <br />