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Figure 8-21 presents the TDS versus time plot for data <br />• collected from water from new backfill well GFil. Well GF11 was <br />completed in the backfill material in an area where the D seam <br />was mined. The TDS value in this backfill aquifer is very <br />similar to the TDS of the DR aquifer. The OR aquifer in the <br />eastern part of the permit area is monitored by wells GPS, GP6 <br />and GP1. Well GPI is a flawing well that will flow at a very low <br />rate. After well head pressure is measured, the well is turned <br />on and allowed to flow for a couple of days before sampling. TDS <br />data for well GPI has generally been steady with the exception of <br />one outlier. <br />Well GP2 is also in the eastern part of the permit area and <br />is used to monitor the KLM aquifer in this area. Figure B-23 <br />presents a plot showing steady concentrations of TDS for well GP2 <br />• since monitoring began after the well was installed in 1985. <br />Well GP3 is used to monitor the HI aquifer in this area. <br />TDS values have remained steady since monitoring of well GP3 <br />began after its completion in 1985 (see Figure 8-24). Figure B- <br />25 presents the TDS versus time plot for well GP4. Well GP4 <br />exhibits a very similar TDS plot for water from the KLM aquifer <br />in this area. The 1988 TDS values for well GP4 are slightly <br />higher than past values, but very close to the past data. <br />Figures H-26 and H-27 present TDS plots for wells GP5 and <br />GP6. These wells are used to monitor the QR aquifer in their <br />respective areas. TDS values for these wells have remained <br />steady since they were completed and monitoring began in 1985. <br />The TDS from upgradient well GP6 is approximately one-half of the <br />value from well GPS. The higher TDS at well GPS is thought to <br />3-6 <br />