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During the 2003 water yeaz concentrations of the major ions (alkalinity, bicazbonate, 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 neaz the upper surface of the topographic rechazge area. A~calinity (as CaCO3) Alkalinity concentrations vary relatively widely for the springs. Alkalinity concentrations at Spring 1 were the lowest of the springs at 202 mg/L during the March 2004 sampling. Spring 3 has values ranging from 312 to 455 mg/L over the past ten water years. Spring 4 has shown consistently lower concentrations than Spring 3, ranging from 242 to 440 mg/L over the same period. The average concentration has not changed significantly over this period for either spring. This water yeaz, Spring 3 concentrations decreased to a historic low within recorded observations (310 mg/L). Spring 4 alkalinity concentrations remained at levels above the all-time low in water yeaz 2002 to concentrations within the historic range prior to water yeaz 2002. 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 calendaz quarter of 1994 and the lowest concentrations during the prior two water yeazs. Bicazbonate concentrations at Spring 1 were the lowest of the springs sampled in water yeaz 2004 at 202 mg/L. Bicazbonate concentrations aze generally higher in Spring 3 (ranging from 312 to 555 mg/L) than those in Spring 4 (ranging from 230 to 537 mg/L) over the past ten water years. As with alkalinity, the Spring 4 concentration was the lowest recorded during the first quarter of the 2002 water yeaz. The concentration has 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/[.). Calcium concentrations appeaz highest during low flow conditions and aze 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 prior nine water years have remained consistent, ranging from 34 to 50 mg/L throughout the period. During the March 2004 Carbon Jurwtbn Mlne Page 8 Annual Hydrologic Report for Water Yaar 2004