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0 Iron Iron concentrations were elevated during the fourth calendaz quarter of 2000, significantly so for well 95-1. During the second sampling this yeaz, all wells revealed reduced iron concentrations, leading to the conclusion that the fourth quarter 2000 value far well 95-1 was an aberrant concentration. This water yeaz, iron concentrations in well 17-B showed a spike similar to that of well 95-1 two years prior. As before, the level attenuated the following quarter. Magnesium Magnesium concentration levels in all groundwater monitoring wells remained within historic values during this water yeaz. Well 17-B shows the least overall variability for magnesium values of the three wells, ranging from 5.7 to 19.0 mg/I, over the past eight yeazs. Well 94-1 showed the widest range in values, ranging from 22.4 mg/L (W.Y. 1997) to 128.0 mg/L (W.Y. 1995). Magnesium values for well 95-1 were intermediate between wells 17-B and 94-1. Wells 94-1 and 95-1 show a slight overall decrease in concentrations over the past eight water years. Sodium Sodium concentrations within all wells remained within historic ranges this water yeaz. Wells 17-B and 94-1 show significant variability in the range of sodium values, while well 95-1 shows minimal concentration variability over the past eight water years. Sulfate Sulfate concentrations vary widely within and between the wells. Well 17-B has had consistently low sulfate levels throughout the past eight water yeazs. Well 94-1 reveals a wide range of sulfate concentrations ranging from 42 mg/L (W.Y 1999) to 680 mg/L (W.Y. 1995). Concentration fluctuations have attenuated over the past three water yeazs, remaining in the 205-360 mg/L range. Well 95-1 illustrated wide initial fluctuations in sulfate concentrations (W.Y. 1997-1998) with subsequent water yeazs revealing no detectable sulfate concentrations. Trace Elements Many of the trace elements found to be below the detection limits for the springs sampled were also found to be below detection limits for the wells sampled. These trace elements are arsenic, cadmium, carbonate, mercury, nitrite, nitrate, nitrate/nitrite, total phosphate, selenium, and zinc. Other trace elements found at detectable limits are consistent within each well at levels that do not indicate high or low fluctuations of these elements. Overall, elements that aze detectable and those that aze not have been consistent throughout the groundwater well monitoring program at the Cazbon Junction Mine. Garbon Juncgon Mine Page 70 Annual F~Aroiogic Reyortfnr Water Year PA02