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and 8-13). TDS concentrations for the DR and HI aquifers in this <br />• area have been fairly steady with time with no significant <br />trends. TDS had averaged approximately 500 mg/1 for the last few <br /> years in well GE3. Values for 1986 in well GE3 are slightly <br /> lower than past values. A considerable variation in TDS has been <br /> observed in the last few years. TDS has been significantly less <br /> the last few years than it was in 1976 through 1978. This c ould <br /> be due to the higher rates of ground-water flaw in this area from <br /> the increased gradient. <br /> Figure 8-14 shows a steady TDS concentration plot for well <br /> GF1, a Twenty Mile Sandstone well. TDS concentrations for this <br /> well have not varied as the Twenty Mile at well GDS has. A <br /> fairly steady concentration would be expected of a deep aqu ifer <br /> as the Twenty Mile Sandstone. The concentration plot from well <br />• GFI is thought to be more typical of this aquifer. The TDS for <br /> well GF2 has also been steady (see Figure 8-15). This well is <br /> completed in the U aquifer below the R coal seam. The 1986 <br /> values show essentially no change from past values. The KLM <br /> aquifer, which is above the DR aquifer, is monitored at well GF3. <br /> Results from this well show fairly steady concentrations with <br /> time. The H and I coal seams have recently been mined uphil l of <br /> well GF4. TDS data from this well indicates that mining has not <br /> affected concentrations in this area of the HI aquifer (see <br /> Figure B-17>. <br /> Backfill well GFS has been monitored for over four ye ars. <br /> The data for the last four years indicates that TDS in the <br /> backfill aquifer has reached the maximum concentration (see <br />• f <br /> or <br />Figure B-16). TDS values have remained steady except one <br />3-4 <br />