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bedrock <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />GROUND W~TER.MONITORING <br />Water Levels - Two wells in the Wadge Overburden (which includes the Wadge <br />Coal) ar•e monitored. Water Levels in the wells have been measured since <br />1979 (Figures 4 and 5). The two wells seems to indicate some impact on <br />water levels from mining. The water levels have been rising from 1980 to <br />1985. This is probably due to cessation of mining in the Vicinity of the <br />wells in 1979 or 1980. Due to the wells proximity to Foidel Creek, the <br />trend may be the result of a long-term climatological trend. The data <br />indicates that the water levels in the 1Jadge overburden varies seasonally: <br />the water levels in the summer are usually higher than in the winter. <br />Water Quality - The water quality data for the Wadge Overburden wells is <br />summarized on Tables 4 through 7. A plot of dissolved solids is presented <br />on Figure 6. The baseline dissolved solids level is approximately 1000 <br />mg/l. There is insufficient data to indicate whettrer this level, which is <br />significantly higher than background levels in other areas of Twentymile <br />Park is due to natural causes or is related to mining. The dissolved solids <br />concentration in Well 008-77-58 is not increasing. The dissolved solids <br />concentration in Well 008-79-6 increased at the end of 1988 bnt additional <br />data is required to determine if this is a trend. The data does not <br />indicate any significant changes in the trace metals concentrations. <br />Alluvium <br /> Sediments at the Foidel and Middle Creek confluence are monitored <br />' alluvial wells completed in the Foidel Creek alluvium are monitored. <br />Two <br /> Water Levels - The plot of the hist.eric water levels in the two Foidel Creek <br /> Alluvial wells and Foidel Creek are presented nn Figure 7. The water levels <br /> in the wells and stream show the typical seasonal pa ttern, of relatively <br /> id i d d <br />d <br />i <br />ff <br />l t <br />d <br />th <br />t <br /> rap <br />ncrease an ng rurro <br />as <br />ec <br />ine <br />ue to spr ream wa <br />er <br />o <br />e s <br /> levels. While the seasonal variation in water levels is readily apparent, <br />' no impact from the mining is evident. <br /> <br />- 3 - <br />