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Aluminum/Unionized Ammonia/Nitrite/Orthophosphate <br />All values obtained for Aluminum (Figure l4), unionized ammonia (Figure 15), and orthophosphate (Figure l7) <br />have been low with most being below detection limits (Appendix A). The unionized ammonia concentration appeared to drop <br />for [he 1998-1999 monitoring period due to the laboratory lowering the detection limit from 0.05 ppm to 0.01 ppm. In 2001, <br />the laboratory raised the detection limit for unionized ammonia back to 0.05 ppm, then lowered the detection back to 0.01 <br />ppm in 2001. The nitrite concentration upstream of the mine at TR-A was 0.06 ppm in the July 2001 sample. The <br />concentration decreased as it passed by the mine site as a result of dilution. Samples collected in May and October 2001 <br />show nitrite levels at TR-A below the detection limit. The apparent elevated aluminum level shown in May 1995, was due to <br />the laboratory lower detection limit being set at 0.2 ppm instead of 0.05 ppm. Aluminum was elevated at TR-C during the <br />April 2001 sampling period. However, concentrations downstream of TR-C are consistent with previous sampling results. <br />Therefore, either sample contamination or laboratory ertor is suspected. The 2004 sampling period shows consistent <br />sampling results to the 1995-2004 monitoring period. Aluminum was elevated a[ TR-c during the July 2004 sampling period. <br />Orthophosphate showed some perturbation during the 2001 sampling period at TR-B. However, concentrations <br />downstream of TR-B are consistent with previous sampling results. Therefore, either sample contamination or laboratory <br />error is suspected. <br />Chloride/Potassium/Iron <br />Chloride and potassium (Figure 18) were added to the monitoring program in 1993 while iron (Figure 19) was added <br />in 1994. The concentrations of all of these parameters in Trout Creek water are generally iow. <br />19 <br />