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Bicarbonate <br />Concentrations of bicarbonate at both springs 3 and 4 have slightly decreased over the <br />past nine water years. With one exception, the highest concentrations were reported <br />during the fourth calendar quarter of 1994 and the lowest concentrations during the last <br />two water yeazs. Bicarbonate concentrations are generally higher in spring 3 (ranging <br />from 312 to 555 mg/L) than those in spring 4 (ranging from 230 to 537 mg/L) over the <br />past nine water years. As with alkalinity, the spring 4 concentration was the Lowest <br />recorded during the first quarter of the 2002 water year. The concentration has since <br />returned to within the historically observed range. Bicarbonate concentrations at spring 1 <br />were the lowest of the springs sampled at 161 mg/L. <br />Calcium <br />Calcium concentrations at both springs have remained consistent over the past nine <br />reporting years. Spring 3 concentrations (ranging from 400-515 mg/L) remain higher than <br />those of spring 4 (ranging from 280-388 mg/L). Calcium concemrations appear highest <br />during low flow conditions and aze less during higher flow in the spring. Spring 1 has <br />significantly lower calcium concentrations than springs 3 and 4, <br />Cbloride <br />. Chloride concentrations at spring 3 over the past nine water years have remained <br />Consistent, ranging from 34 to 50 mg/L throughout the period. Concentrations in spring 4 <br />decreased significantly from 1995 to water year 2002. During the December 2002 <br />samp]ing the highest chloride concentration during this reporting period was measured (62 <br />mg/L). In the 1994 and 1995 water years, concentrations were in the 45-59 mg/L range, <br />while the most recent concentrations range between 29 and 34 mg/L (2000 and 2001 <br />water years). 7n water year 2002, first quarter concentrations were elevated, at 54 mg/L, <br />though they subsequently dropped to 47 mg/L during the Mazch 2002 sampling. This <br />water year, fourth calendaz quarter 2002 concentrations were the highest (62 mg/L), then <br />dropped 37 percent to 39 mg/L, within the recent historic range. Chloride concentrations <br />at spring 1 were below the detection level. <br />Magnesium <br />Spring 3 magnesium concentrations were elevated during the first two water yeazs of the <br />reporting period, decreased through water yeaz 1999 and have been increasing slightly in <br />the last four water years. This years concentrations aze slightly above the 2002 water year <br />recorded high of 250 mg/L, though only slightly above the highest concentrations during <br />water year 1995 (243 mg/L). Spring 4 magnesium concentrations have flowed the same <br />trend as spring 3 with decreases from averages in the 165 mg/L range (water years 1995- <br />1996) to an average in the 125 mg/L range during the 2000 and 2001 water years. In <br />water year 2002, concentrations were elevated (averaging 210 mg/L), while this water <br />GrWn Juncikn M6ro Page 8 <br />Mnual Hydrokgk RePorCfar Water Year1A03 <br />