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' 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 occurzed in the <br />' summers of 1998 through 2000, possibly due to nearby agricultural activity. In 2001, concentrations of orthophosphate <br />returned to historically low levels. Site TR-4 has shown a slight rise in orthophosphate concentration during the 2005 <br />monitoring period. Nitrite concentrations were again elevated at TR-1.5 and WR-1 in May 2001, but decreased to historical <br />' levels as [he year progressed. Nitrite levels remained at historical levels in the 2005 monitoring period. <br />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. Potassium concentrations at TR-4 have leveled over the last few years. Chloride at TR-4 spiked <br />in both October 2004 and May 2005, however concentrations returned to historical levels over the 2005 monitoring period. <br />42 <br />