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1 <br />' Aluminwn/Unionized Ammonia/Nitrite/Orthophosphate <br />All values obtained for Aluminum (Figure 14), unionized ammonia (Figure IS), and orihnphos'phate (Figure 17) <br />' have been low with most being below detection limits (Appendix A). The unionized ammonia concentration appeared to drop <br />for the 1997-1999 monitoring period due to the laboratory lowering the detection limit from 0.05 ppm to 0.01 ppm. In 2000. <br />the laboratory raised the detection limit for unionized ammonia back to 0.05 ppm. The nitrite concentration at TR-D was <br />elevated to 032 ppm in the April 1999 sample. Subsequent 1999 samples were below the 0.01 ppm detection limit. <br />' Therefore, either sample contamination or laboratory ertor is suspected. The apparent elevated aluminum level shown in May <br />1995, was due to the laboratory lower detection limit being set at 0.2 ppm instead of 0.05 ppm. <br />Orthophosphate showed some perturbation during the 1990 sampling period. However, concentrations since then <br />' have been consistently low. <br />' Chloride/Potassium/tron <br />Chloride and potassium (Figure IS) were added to the monimring 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 low. <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />' 19 <br />