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Calcium/Magnesium/5odium <br />Calcium (Figure 25) is the major cation found in all of the wells with concentrations of <br />sodium (Figure 26) and magnesium (Figure 27) occurring in lesser quantities. The sodium <br />concentration at TR-I.5 in May 2001 was 179 ppm. This value is inconsistent with the <br />historical sodium concentrations and the levels after May 2001. Therefore, either sample <br />contamination or laboratory error is suspected. TR-1.5 generally contained the lowest <br />concentrations of cations with a slight increase occurring downstream at TR-3 and TR-4 for <br />the majority of the record. However, elevated levels of these parameters at TR-1.5 began to <br />occur in 1995 consistent with the elevated Conductivity and TDS levels previously <br />mentioned. Elevated levels of sodium concentration occurred at TR-4 during the 2004 and <br />2005 sampling period compared with those of the last decade. However, the sodium <br />concentration levels remain within historical levels found in Trout Creek. <br />Calcium, magnesium and sodium concentrations exhibited the same trends in 2006 as <br />found during previous years of monitoring. Calcium, magnesium and sodium analyzed values <br />are provided in tabular format in Appendix B. <br />38 <br />