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• during the last three years has also been observed in well GP-8, which has to be a natural <br /> fluctuation due to its location. <br /> Figures B-5 and B-6 present the TDS concentrations versus time for the HI aquifer <br /> wells. The TDS concentrations in HI well GB-5 have been low and fairly erratic and do not <br /> show a consistent trend. The TDS in HI aquifer wells GE-2 and GF-4 has gradually <br /> increased in concentrations during the last eleven years. The small increases are well <br /> within natural fluctuations in this aquifer. TDS concentration in backfill well GF-5 is slightly <br /> greater but is still well within the natural range for the HI aquifer. The TDS in well GF-5 <br /> does not show a consistent trend. Significantly higher TDS values have been observed in <br /> backfill well GF-7 with the concentrations increasing in 1998 after a large decline during <br /> the previous two years. IDS values in this backfill aquifer will likely fluctuate until they <br /> • decline to a value similar to the HI aquifer in this area. Wells GMP-1 and GP-3 are two HI <br /> aquifer wells north of the A pit. A significant increasing trend in TDS was observed in 1998 <br /> in well GMP-1 after a large decline in concentrations in 1997. This well is immediately <br /> downgradient of the reclaimed A pit and is likely showing fluctuations from the backfill <br /> aquifer. The TDS values and fluctuations in well GMP-1 are similar to those in well GC-1, <br /> which have to be natural. TDS concentrations in HI aquifer well GP-3 in 1998, further <br /> downgradient, consist of values similar to it's historical average. TDS concentrations in <br /> eastern wells have varied, showing that TDS varies naturally over a large range in this <br /> aquifer. Fluctuations observed in wells GC-1 and GP-7 must be natural due to their <br /> location. <br /> Figure B-7 presents the TDS for 3rd White Sandstone wells GB-2, GC-2, GP-9, P-8 <br /> and 81-03A. Concentrations in each of these wells have been fairly steady for the last <br /> 3-3 <br />