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laboratory raised the detection limit for unionized ammonia back to 0.05 ppm, then <br />lowered the detection back to 0.01 ppm in 2002. The 2006 sampling period shows consistent <br />sampling results to the 1997-2006 monitoring period. Unionized ammonia concentrations <br />were below the detection limit at all sites for all sampling dates of 2006. Unionized ammonia <br />concentrations are provided in tabular format in Appendix A. <br />Nitrite concentrations have been consistently below detection limits with few <br />exceptions. The nitrite concentration upstream of the mine at TR-A was 0.06 ppm in the July <br />2001 sample. The concentration decreased as it passed by the mine site as a result of dilution. <br />Samples collected in May and October 2001 show nitrite levels at TR-A below the detection <br />limit. The 2006 sampling period shows consistent sampling results to the 1997-2006 <br />monitoring period. Nitrite concentrations were below the detection limit at all sites for all <br />sampling dates of 2006. Nitrite concentrations aze provided in tabular format in Appendix A. <br />Orthophosphate showed some perhubation during the 2001 sampling period at TR-B. <br />However, concentrations downstream of TR-B are consistent with previous sampling results. <br />Therefore, either sample contamination or laboratory error is suspected. The 2006 sampling <br />period shows slightly elevated sampling results compared to the 1997-2006 monitoring <br />period. Orthophosphate concentrations are provided in tabular format in Appendix A. <br />Chloride/Potassiurn/Iron <br />Chloride and potassium (Figure 18) were added to the monitoring program in 1993 while iron <br />(Figure 19) was added in 1994. The concentrations of all of these pazameters in Trout Creek <br />water are generally low. The 2006 sampling period shows consistent sampling results to the <br />1997-2006 monitoring period regarding these constituents. Chloride and potassium have <br />shown a trend decrease and stabilization from 1995-2006. Iron levels during the 2006 <br />monitoring period slightly decreased relative to those since 2004 showing a general relation to <br />flow in Trout Creek. Chloride, potassium and iron concentrations are provided in tabular <br />format in Appendix A. <br />27 <br />