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aquifer dilution from this year's high snowpack runoff. <br />Samples from YeLI 150V, also located in the north mining area, display a Ne-SO4 type water <br />with an average TDS value of 3,615 mg/t for 1993. This is higher than the baseline <br />average (3,394 mg/l) but falls within the baseline range (1,810 to 4,422 mg/l). <br />Well 160V is located et the north end of the south mining area in which mining began in <br />1990. As yet, no samples have been collected from this well due to low casing volumes <br />(two gallons ar less). <br />Samples from Yell 170V, located downgredient of the central portion of the south mining <br />area, display a NaNgCa-504 type water with an average TDS value of 5,807 mg/l during 1993. <br />This value is both lower then the baseline average (8,272 mg/l) and the baseline range <br />(7,928 to 8,586 mg/l). <br />Samples from Well 180V, located at the south end of the south mining area, displays <br />Na-HC03 type water. The average TDS value of 588 mg/l for 1993 is both lower than the <br />baseline average (775 mg/l) and the baseline range (740 to 79B mg/l). <br />Wedge Loal. Well 14Y is Located in the north mining area. Sufficient water for sampling <br />was first observed in this welt in June, 1993. That sample displayed a NgCe-NC03SO4 type <br />water with a TDS value of 1,390 mg/l. <br />Samples from Well 15Y, located in the north mining area, displays a Na-SO type water with <br />4 <br />an average TDS value of 4,655 mg/l for 1993. This value is considerably higher than both <br />the baseline average (1,330 mg/l) and the baseline range (1,208 to 1,600 mg/l). Pater <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 seam (See the 1992 ANR 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 /> <br />• <br />YeIL 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 three sampling periods (July, 1991, October, <br />1991, and October, 1992) there has been enough water to sample. The October, 1992 sample <br />displayed a Na-504 type water with a TDS value of 3,240 mg/l. <br />6 <br />