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occurred from 1989 through 1994, while an overall decline has occurred in 1997. The <br />i <br />fluctuation in this backfill aquifer is well within natural ranges and may not be a function of <br />the backfill aquifer. The TDS in this backfill aquifer is greater than it is downgradient in the <br />R Coal at GD-2. A small, gradual decrease in TDS occurred in well GD-2 in 1997. This <br />change is well within natural fluctuations. The TDS in well GE-1 increased from 800 to <br />1100 mgA over the last eight years. This increase could be due to upgradient QR mining, <br />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 wells. A gradual, decreasing trend was occurring in backfill well GF-11 but <br />an increase was observed during the first half of 1997, while the latest values show a <br />decline. This plot indicates that the maximum concentration in this backfill aquifer may have <br />been obtained in 1994 and 1995. Concentrations in the QR aquifer are monitored • <br />downgradient at well GF-6 and have shown no influence from the upgradient mining. <br />Figure B-3 also presents the TDS concentrations for QR wells GP-5 and GP-6. Well GP-6 <br />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 Mine <br />at well GP-1 has been fairly steady for the last several years. <br />Figure B-4 presents the TDS concentrations for five KLM aquifer wells. Historical <br />data for well GA-2 are shown as a solid blue dot. Well GF-3 is shown with red squares and <br />TDS values indicate a very gradual decreasing trend in TDS in 1997 after several years of <br />an overall increasing trend. This change in TDS is well within the natural fluctuation in TDS <br />in the KLM aquifer. The data for well GP-4 is presented in magenta on Figure B-4 and <br />shows a fairly steady TDS concentration for the last several years with the exception of one • <br />3-2 <br />