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1 <br /> <br />' this aquifer from recent samples compared to the early values. This <br /> increase is natural because mining is sev eral miles from this well. <br />' <br /> Well GC2 has not been monitored for the las t several years, but recent <br />' samples indicate a similar increase in TDS for the Third White <br /> Sandstone water. The third well, GC3, at this site monito rs the <br />' alluvial aquifer and TDS values from this well have typically varied <br /> over a larger range because this aquifer is influenced more by c hanges <br />' <br /> in recharge conditions (see Figure B-7). <br />' Well GD1 is the water supply well for the mina and is completed <br />' in the 20 Mile Sandstone. The TDS plot (Figure B--B) for water from <br />this well shows a decline in TDS in 1961 and 1982 ,and an increase in <br />' the last four years, except the 1984 value. 4'he 1984 value is <br />significantly below the other values, but the DSSi]M value indicates <br />that the TDS is a good measurement. The upward trend over the last <br />' few years could be the result of increased usage of this well since <br />1985 but is not thought to be caused by mining because mining does not <br />' penetrate this aquifer. Well GD2 is completed in the QR aquifer below <br />the present mining of these seams in the D Pit. The TDS measurements <br />(see Figure B-9) for this well show a fairly steady concentration <br />since 1982. <br />t The GE cluster of wells are used to monitor the QR, HI, and <br /> Second White Sandstone aquifers (see Figures B-10, B-11, and B-12). <br /> TDS concentrations for the QR and HI aquifers in th is area have been <br /> fairly steady with time with no significant trends. TDS has averaged <br /> <br />1 <br />3-3 <br /> <br />