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i~ <br />~~ <br />' Orthophosphate/Nitrite <br />Historically, orthophosphate (Figure 33) and nitrite (Figure 34) values obtained over the period of record have been <br />' low with most being below detection limits (Appendix B). However, elevated orthophosphate readings occurred in the <br />summers of 1998 through 2000, possibly due to nearby agricul[uml activity. In 2001, concentrations of orthophosphate <br />' returned to historically low levels. Nitrite concentrations were again elevated a[ TR-1.5 and WR-I in May 2001, but <br />decreased to historical levels as the year progressed. <br />t Chloride/Potassium <br />' Chloride and Potassium (Figure 35) were added to the parameters list in 1994. Levels of both have increased in TR- <br />4 over the course of 2003. <br />II <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br />J <br />1 <br />43 <br />