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Calcium/Magnesium/Sodium <br />Calcium (Figure 7) is the dominant cation in Trout Creek with magnesium (Figure 8) <br />and sodium (Figure 9) occurring in lesser concentrations. While the relative proportions of <br />these parameters change slightly between the sampling points, all show peak concentrations <br />coinciding with spring runoff, as would be expected. As with TDS, all three cations show <br />general increases in concentration as the water passes the mine area. Additionally, the relative <br />proportion of each constituent remains constant to the other constituents. While trends in <br />their subsequent dilution downstream have yet to form a consistent pattern, little or no <br />dilution in any of the concentrations have occurred between sampling points TR-C and TR-D <br />since 1989. For 1997-2006, it is believed that this was due in part to the Moffat area mining <br />and reclamation activities and, as such, the pattern is anticipated to continue. However, since <br />this occurrence existed prior to the initiation of Moffat mining activity, the trend may also <br />suggest that inflow from undisturbed areas upstream and downstream of TR-C contains <br />approximately the same concentrations of these parameters as runoff from the mine. Calcium, <br />magnesium and sodium concentrations exhibited the same trends in 2006 as found during <br />baseline studies and previous years monitoring. Calcium, magnesium and sodium <br />concentrations are provided in tabular format in Appendix A. <br />13 <br />