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• <br />TDS plot for this well shows that TDS has been fairly steady the last <br />three years. Well GC2 was not required for monitoring between March <br />1977 and September 1985, although some water-level elevations were <br />collected. Recent samples indicate an increase in TDS for the Third <br />White Sandstone water in this area. This increase has to be natural <br />due to the large distance from mining to this area. The third well, <br />GC 3, at this site monitors the alluvial aquifer and TDS values from <br />this well have typically varied over a larger range because this <br />aquifer is influenced more by changes in recharge conditions (see <br />Figure B-7). <br />Well GD1 is the water supply well for the mine and is completed <br />• in the 20 Mile Sandstone. The TDS plot (Figure B-B) for water from <br />this well shows that the values have been similar for the last three <br />years. Well GD2 is completed in the QR aquifer downgradient of recent <br />mining of these seams in the D Pit. The TDS measurements (see Figure <br />B-9) for this well show a fairly steady concentration since 1983 <br />indicating that mining in the QR aquifer has not affected water <br />quality downgradient in this area. <br />The GE cluster of wells are used to monitor the QR, HI, and Third <br />and Second White Sandstone aquifers (see Figures B-10, B-11, and <br />B-12). TDS concentrations for the QR and HI aquifers in this area <br />have been fairly steady with time with no significant trends. TDS has <br />averaged 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 />3-3 <br />