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since 1986. This slight rise is still within natural fluctuations. <br />The backfill aquifer in the Ashmore Pit area is monitored by <br />well GF5. Figure B-18 shows that conductivities for well GF5 have <br />been fairly stable since 1984. Figure B-19 presents the <br />conductivity versus time plot for well GF6. Although there is <br />scatter over a range from 680 to 1600 µmhos/cm, overall, the values <br />have been steady. <br />Figures B-20 and B-21 present field conductivity data versus <br />time for well GF7 and GF11, respectively. Recovery of water levels <br />in the backfill material near cell GF7 has caused the rise in <br />conductivity since the well was installed in 1987. The increase in <br />conductivity in this well is due to ground water dissolving <br />constituents as it enters the backfill material. Conductivity has <br />been fairly steady for 1989 through 1991. The 1992 and 1993 <br />results show considerable scatter but may be the start of a <br />decreasing trend. An overall increasing trend seems to be <br />occurring in the backfill water at GF11, with a significant amount <br />of fluctuation for this uppermost aquifer. The conductivities in <br />this backfill aquifer are very close to background values. <br />Figure B-22 presents the plot of field conductivity versus <br />time for well GP1. A fair amount of scatter is seen in the data <br />with the last feu years" conductivity values showing a decline <br />below the 1986 and 1987 values. This well is located in an <br />undisturbed area east of mining activity. It is completed in the <br />QR aquifer and is also in an upgradient position within the PA. <br /> <br />3-4 <br />