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water yeazs 1999 and 2000. During the last three water yeazs chloride concentrations <br />have decreased, though concentrations in well 95-1 slightly above 1997-19981evels. <br />Iron <br />Iron concentrations were elevated during the fourth calendaz quarter of 2000 and second <br />calendaz quarter of 2002, significantly so for wells 17-B and 95-1. During the later half of <br />water yeaz 2002, all wells revealed reduced iron concentrations, leading to the conclusion <br />that the above values for wells 17-B and 95-1 were aberrant concentrations. This water <br />yeaz, iron concentrations in all wells were consistently low. <br />Magnesium <br />Magnesium concentration levels in all groundwater morritoring wells generally remained <br />within historic values during this water yeaz. 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 years. <br />This water yeaz magnesium values at well 17-B started high (36.1 mg/L) and decreased <br />rapidly to historic levels, leaving the question of whether the initial value was aberrant. <br />Magnesium values for well 95-1 were slightly above those for well 17-B. Both wells 17-B <br />and 95-1 showed a decrease in concentrations over this water yeaz. <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 spdce, followed by a return to <br />historic levels two months later, suggesting an aben•ant 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 />yeaz. <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 />yeazs revealing no detectable sulfate concentrations. <br /> <br />Carbon JunaUon Mires Page 11 <br />Annual I{ydrokgk Report for Water Year?A04 <br />