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Bicarbonate/Sulfate <br />Bicarbonate (Figure 28) and sulfate (Figure 29) show a trend of topological change similar to that observed in the <br />surface waters. The bicarbonate/sulfate ratio (Figure 30) during much of the previous decade showed the alluvial waters at <br />TR-1.5 to be of a bicarbonate type while the alluvial waters at TR-3 and TR-4 were of a sulfate type. However, waters at <br />TR-1.5 have been tending [o become more sulfate over [he period of record. During 1996-2005, the bicarbonate/sulfate ratio <br />at TR-1.5 was very similar to that found in WR-1 providing further evidence that the source of sulfate may be from a sulfur <br />rich source such as leakage from an old abandoned underground mine. Bicarbonate levels in TR-4 rose from 2003 to 2005 <br />driving the sulfate/bicarbonace ratio lower. This may be due to the well repairs performed in the spring of 2003. <br />Dissolved Iron/Manganese <br />Overall, dissolved iron (Figure 31) and manganese (Figure 32) levels for the three alluvial wells remained low <br />during 2004 as in previous years. Manganese concentrations in TR-4 rose from 2003 to 2005. Once again, this may be due <br />[o [he well repairs conducted in [he spring of 2003. <br />36 <br />