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' Aluminum/Unionized Ammonia/Nitrite/Orthophosphate <br />All values obtained for Aluminum (Figure 14), unionized ammonia (Figure IS), and orthophosphate (Figure 17) <br />have been low with most being below detection limits (Appendix A). The unionized ammonia concentration appeared to <br />drop for the 1998-1999 monitoring period due to the laboratory lowering the detection limit from 0.05 ppm to 0.01 ppm. In <br />' 2001, the laboratory raised the detection limit for unionized ammonia back to 0.05 ppm, then lowered [he detection back to <br />0.01 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 error is suspected. The 2005 sampling period shows consistent <br />' sampling results to the 1996-2005 monitoring period. Aluminum was slightly elevated during the 2005 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. The 2005 sampling period shows consistent sampling results to the 1996-2005 monitoring period. <br />Chloride/Potassium/Iron <br />Chloride and potassium (Figure 18) were added to the monitoring program in 1993 while iron (Figure 19) was <br />added in 1994. The concentrations of all of these parameters in Trout Creek water are generally low. The 2005 sampling <br />period shows consistent sampling results to the 1996-2005 monitoring period regarding these constituents. Chloride and <br />' potassium have shown a trend decrease and stabilization from 1995-2005. Iron levels during the 2005 monitoring period are <br />relative to those since 2002 showing a direct relation [o flow in Trout Creek. <br />19 <br />