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Magnesium <br />Magnesium concentration levels in all groundwater monitoring wells generally remained <br />within historic values during this water year. Well 17-B shows the least overall variability <br />for magnesium values of the wells, ranging from 5.7 to 19.0 mg/L over the past nine yeazs. <br />This water year magnesium values at well 17-B increased from the lowest concentration at <br />the end of water year 2004 but remained within the historic range. Magnesium values for <br />well 95-1 this year were below those for well 17-B, continuing a decrease from highs at <br />the end of water year 2002. Both wells 17-B and 95-1 showed a decrease in <br />concentrations over this water year. <br />Manganese <br />Manganese concentrations in all wells over the period of record remain low, though well <br />95-1 values fluctuate more than well 17-B. As with magnesium concentrations, the <br />October 2003 value for well 95-1 revealed an unexplained spike, followed by a return to <br />historic levels two months later, suggesting an aberrant value. <br />Sodium <br />With the exception of a spike during the October 2003 sampling at well 17-B, sodium <br />concentrations within wells remained very consistent and within historic ranges this water <br />year. <br />Sulfate <br />Sulfate concentrations vary widely within and between the wells. Well 17-B has had <br />consistently low sulfate levels throughout the past ten water years. Well 95-1 illustrated <br />wide initial fluctuations in sulfate concentrations (W.Y. 1997-1998) with subsequent water <br />years revealing no detectable sulfate concentrations. <br />Trace Elements <br />Many of the trace elements found to be below the detection limits for the springs sampled <br />were also found to be below detection limits for the wells sampled. These trace elements <br />are arsenic, cadmium, carbonate, mercury, nitrite, nitrate, nitrate/nitrite, total phosphate, <br />selenium, and zinc. Other trace elements found at detectable limits are consistent within <br />each well at levels that do not indicate high or low fluctuations of these elements. Overall, <br />elements that are detectable and those that aze not have been consistent throughout the <br />groundwater well monitoring program at the Cazbon Junction Mine. <br /> <br />Carbon JwatiMl Mire Page 1Y <br />Annual Hydrologic Report for Water Year 2005 <br />