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Concentrations of TDS in water from the QR aquifer in this area <br />have been fairly steady since 1974, at a concentration of <br />approximately 800 mg/1. Well GA2 has been used to monitor the <br />KLM at this site. Figure B-2 shows the TDS for this well versus <br />time. A similar TDS to that observed for water from well GA1 is <br />shown for well GA2. The 1988 data for both wells shows a slight <br />increase over data from 1987. <br />Figure B-3 presents the TDS plot for the Third White <br />Sandstone well GB2. Water from well GB2 had a fairly steady TDS <br />for this aquifer at this location until 1982 when the <br />concentration was significantly less than most of the previous <br />measurements. An increase in concentration occurred for the next <br />three years. The 1988 TDS value shows a small decline from 1987. <br />• The TDS data for well GB2 has shown a decline since September <br />1985 to levels similar to those of 1982, slightly below the mean <br />of the data prior to 1982 (approximately 900 mg/1). This change <br />was probably caused by mining, but is within the natural range of <br />variation with time. It is likely that mining has caused the <br />lower and higher concentrations. These affects are possibly <br />allowing concentrations to return to the pre-mine level. The TDS <br />concentration, at this location in the HI aquifer, has not varied <br />as it has in the Third White Sandstone. Figure H-4 (well GBS) <br />in Appendix B shows a slightly declining concentration since 1983 <br />except for one outlier. <br />The HI aquifer has been monitored at well GCI since 1974. <br />The TDS plot for this well shows that generally, TDS has been <br />. fairly steady the last three years. Well GC2 was not required <br />for monitoring between March 1977 and September 1985, although <br />3-2 <br />