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Samples from Yell 170V, located downg rsdient of the central portion of the south mining <br />area, display a NgNeCa-504 type water with en everege TDS value of 7,110 mg/l during 1994. • <br />This value is both lower than the baseline everege (8,272 mg/l) end the baseline range <br />(7,928 to 8,586 mg/l). <br />Samples from Yell 180V, located at the south end of the south mining area, displays a <br />Na-8C03 type water. The everege TDS value of 663 mg/l for 1994 is both lower than the <br />baseline everege (775 mg/l) and the baseline range (740 to 798 mg/l). <br />Madge Coal. Yell 14V is located in the north mining area. Sufficient water for sampling <br />was first observed in this well in June, 1993. In 1994, samples displayed a MgCa-HC03 <br />type water with a TDS value of 838 mg/l. <br />Samples from Yell 15Y, located in the north mining area, displays a Na-S04 type water with <br />an average TDS value of 3,922 mg/l for 1994. This value is considerably higher then both <br />the baseline average (1,330 mg/l) and the baseline range (1,208 to 1,600 mg/l). Peter <br />samples used for the baseline data are believed to be contaminated with low TDS drilling <br />fluid, while samples collected since June, 1990 reflect the true water chemistry of the <br />coal seem (see the 1992 AXR for more detail). Since TDS increases occurred before mining • <br />in this area, the high TDS value must be a result of natural conditions. <br />Yell 16Y is located at the north end of the south mining area. Little or no water is <br />normally present in this well; however, on four sampling periods (since July, 1991) there <br />has been enough water to sample. The June, 1994 sample displayed a Na-S04 type water with <br />a TDS value of 3,296 mg/l. <br />Samples from Yell 17Y, located downgradient of the centre( portion of the south mining <br />area, display a Ne-NC03 type water with an everege TDS value of 632 mg/I for 1994. This <br />value is lower then the baseline average of 906 mg/l but fells within the baseline range <br />of 628 to 1,662 mg/l. <br />Samples from Yell 78Y, located at [he south end of the south mining area, display s <br />MaNpCa-HC03 type water with an average TDS value of 638 mg/L for 1994. This value is <br />lower than the baseline average of 669 mg/L but falls within the baseline range of 626 to <br />718 mg/l. <br />• <br />b <br />