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Ionic Constituents During the 2003 water year concentrations of the major ions (alkalinity, bicarbonate, calcium, chloride, magnesium, manganese, and sodium) remained within observed historic ranges or slightly below historic ranges in Springs 3 and 4. Values vary for constituent concentrations between the springs; therefore brief descriptions of the trends will be presented. Concentrations of the major ions in Spring 1 were consistently much lower than those of Springs 3 and 4. This is not unexpected given the topographic position of Spring 1 near the upper surface of the topographic rechazge area. Bicarbonate Concentrations of bicarbonate at both Springs 3 and 4 have overall decreased slightly over the past ten water years. With one exception, the highest concentrations for both springs were reported during the fourth calendar quarter of 1994 and the lowest concentrations during the prior two water years. Bicarbonate concentrations at Spring 1 were the lowest of the springs sampled in water year 2005 at 208 mg/L. Bicarbonate concentrations aze generally higher in Spring 3 (ranging from 276 to 555 mg/L) than those in Spring 4 (ranging from 230 to 537 mg/L) over the past eleven water years. As with alkalinity, the Spring 4 concentration was the lowest recorded during the fast quarter of the 2002 water year. The concentration bas since returned to within the historically observed range. ~ ~ Calcium Calcium concentrations at the springs have remained consistent over the past ten reporting years. Spring 3 concentrations (ranging from 400-515 mg/L) remain higher than those of Spring 4 (ranging from 280-388 mg/L). Calcium concentrations appeaz highest during low flow conditions and are less during higher flow in the spring. Spring 1 has significantly lower calcium concentrations than Springs 3 and 4. Chloride Chloride concentrations at Spring 3 over the first ten water yeazs have remained consistent, ranging from 34 to 50 mg/L throughout the period. During the March 2004 sampling, the chloride level was measured at 58 mg/L, the highest level recorded to date, though levels returned to the prior historic range this water year. Concentrations in Spring 4 decreased significantly from 1995 to water year 2002. During the December 2002 sampling the highest chloride concentration during this reporting period was measured (62 mg/L), In subsequent years, levels have fluctuated but remain within the range observed prior to December 2002. Chloride concentrations at Spring 1 were below the detection level this year. ~J Carbon Junction Mine Page 6 Anauat Hydrologic Report 6or Water Year 2006