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Aluminum/Unionized Ammonia/Nitrite/Orthophosphate <br />• All values obtained for Aluminum (Figure 14), unionized ammonia (Figure 15), <br />nitrite (Figure 16) and orthophosphate (Figure 17) have been low with most being <br />below detection limits (Appendix A). The apparent elevated aluminum level shown in <br />May 1995, was due to the laboratory lower detection limit being set at 0.2 ppm <br />instead of 0.05 ppm. <br />Orthophosphate showed some perturbation during the 1990 sampling period. <br />However, concentrations since then have been consistently low. <br />Chloride/Potassium/Iron <br />Chloride and potassium (Figure 18) were added to the monitoring program in <br />1993 while iron (Figure 19) was added in 1994. The concentrations of all of these <br />parameters in Trout Creek water are generally low. <br />• <br />• <br />20 <br />