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<br />over a range from 780 to 1120 µmhos/cm. The 1993 values indicate <br />a decreasing trend, probably due to an increase in recharge. ~, <br />Changes in this Well are thought to be within the range of natural <br />fluctuation but could have been influenced some by previous mining. <br />Figure B-5 presents the conductivity data for well GC1. <br />Concentrations have been very steady from this well in 1989 and <br />1990, followed by a decreasing trend. Figure B-6 shows some <br />scatter in the conductivity data taken from well GC2. These <br />changes in conductivity are natural and shows a gradual decrease in <br />conductivity the last few years. Figure B-7 presents the <br />conductivity versus time plot for well GC3. A fair amount of <br />scatter is seen on the plot, but an increase in values was seen <br />from 1984 to 1986, with fairly stable values after the rise until <br />1993. All changes in the aquifers at the GC site are natural due <br />to the distance from active mining and probably reflect increased • <br />ground-water flow resulting from increased precipitation/recharge <br />in 1993. <br />Well GD1 is a Twenty Mile Sandstone well and has been used as <br />the potable water supply well for the mine and the power plant <br />since 1985. Well GDl(2) is a replacement well for GD1. It was <br />installed in December, 1992 and is located 27' north and 98' east <br />of GD1. The increase of water use has resulted in the higher <br />conductivities since 1985 shown on Figure B-8. The 1989 through <br />1993 values have fluctuated, with a mean near 900 µmhos/cm, but no <br />definitive trend has developed. <br />Figure B-9 presents the field conductivity data for well GD2. <br />Conductivities for well GD2 have remained fairly steady the last <br />nine years except for the 1992 decline which is significantly <br />3-2 <br />