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<br /> <br />' approximately 500 mg/1 for the last few years in well GE3. A <br />considerable variation in TDS has been observed in the last few years. <br />TDS has been significantly less the last few years than it was in 1976 <br />' through 1978. This could be due to the higher rakes of ground-water <br />flow in this area from the increased gradient. <br />Figure B-13 shows a steady TDS concentration plot for well GF1, a <br />20 Mile Sandstone well. TDS concentrations for this well have not <br />varied as the 20 Mile at well GD1 has. A fairly steady concentration <br />would be expected of a deep aquifer as the 20 Mile Sandstone. The <br />concentration plot from well GF1 is thought to be more typical of this <br />aquifer. The TDS value for December of 1982 is thought to be a lab <br />' error because the DSSUM indicates a TDS similar to the remainder of <br />the values. The TDS for well GF2 has also been steady (see Figure <br />' B-14). This well is completed in the U aquifer below the R coal seam. <br />' The December, 1982 value is thought to be in error because the DSSUM <br />value indicates that the TDS is too low. The 1986 value shows <br />' essentially no change from past values. The KLM aquifer, which is <br />above the QR aquifer, is monitored at well GF3. Results from this <br />' well show steady concentrations with time. The H and I coal seams <br />' have recently been mined uphill of well GF4. TDS data from this well <br />does not show a-trend (see Figure B-16). <br />' Backfill well, GFS, has been monitored the last three years. The <br />data for the last two years indicates that TDS in the backfill aquifer <br />has reached the maximum (see Figure B-17). The last two TDS values <br /> <br />' 3-4 <br />