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GD2 has not affected conductivities in this area of the QR aquifer. Any changes are thought to be <br />within the range of natural fluctuations. <br />Figure B-11 illustrates that conductivities for well GEl have remained fairly steady since <br />1990 after an apparent increase in late 1989. With the exception of the 2nd quarter measurements, <br />the conductivity at well GE2 increased in 1994 and is presently at pre-1992 levels (Figure B-12). <br />The TDS and laboratory conductivity supports the May field value. Well GE3 shows considerable <br />scatter in field concentrations since 1986. Considerably more scatter was observed in 1994 field <br />measurements when compared to 1993 values (see Fig. B-13). This well is more susceptible to <br />changes because these sandstone aquifers are shallower. A greater natural variation in the <br />conductivities for well GE3 is expected. Mining on the west side of the Trapper Mine permit area <br />was re-started in 1988 and completed in early 1994. Changes in well GE3 are well within the <br />natural changes in these hvo sandstones. <br />Twenty Mile Sandstone well GF] and U aquifer well GF2 have shown very little change <br />in field conductivity during the period presented (1985 through 1994) in Figures B-14 and B-15. <br />The 3rd quarter field conductivity value (650 µmhos/cm) does not correlate well with the values of <br />TDS and laboratory conductivity. Therefore, the 3rd quarter laboratory value of 980 µmhos/cm is <br />thought to be more representative of conductivity of the water from this well. Concentration plots <br />with less scatter are expected from these deeper aquifers. Figures B-16 and B-17 present the field <br />and laboratory conductivities versus time plots for wells GF3 and GF4. Each plot shows a slight <br />overall rise in values since 1986. This slight rise is still within natural fluctuations. <br />The backfill aquifer in the Ashmore Pit area is monitored by well GFS. Figure B-18 <br />shows that conductivities for well GFS have been fairly stable since 1986. Figure B-19 presents the <br />3-3 <br />