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this location. The TDS in this backfill aquifer is greater than it is downgradient in the R • <br /> Coal at GD-2. A large decrease in TDS occurred in well GD-2 in 1998 after a small decline <br /> in 1997. An additional sampling is needed to confirm this large decrease. The TDS in well <br /> GE-1 increased from 800 to 1200 mg/I and was steady at this level in 1998. This increase <br /> could be due to upgradient QR mining, but also is within natural fluctuations. <br /> Figure B-3 also presents a group of five QR wells. Well GF-11 is an equivalent <br /> backfill monitor well. An overall increasing trend in TDS has occurred in backfill well GF-11 <br /> over the last eleven years with short-term declining trends observed within this long <br /> period. The maximum concentration in this backfill aquifer was greater in 1998 than <br /> previously observed from 1994 through 1997. Concentrations in the QR aquifer are <br /> monitored downgradient at well GF-6 and have shown no influence from the upgradient <br /> mining. Figure B-3 also presents the TDS concentrations for QR wells GP-5 and GP-6. <br /> Well GP-6 is upgradient of well GP-5, and, as expected, contains a slightly lower TDS than <br /> downgradient well GP-5. The TDS in the QR aquifer in the east portion of the Trapper <br /> Mine at well GP-1 has been fairy steady for the last several years. <br /> Figure B-4 presents the TDS concentrations for four IaM aquifer wells. Well GF- <br /> 3 is shown with red squares and TDS values indicate a very gradual decreasing trend in <br /> TDS in the last four years after several years of an overall increasing trend. This change in <br /> TDS is well within the natural fluctuation in TDS in the IdM aquifer. The data for well GP-4 <br /> is presented in green on Figure B-4 and shows a very gradual declining trend in TDS <br /> concentration for the last three years which is thought to be a natural variation. TDS <br /> concentrations for two of the eastern IQM wells, GP-2 and GP-8, are also shown on this <br /> figure with concentrations generally between 700 and 800 mg/I. A gradual declining trend • <br /> 3-2 <br />