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Orthophosphate/Nitrite <br />' Historically, orthophosphate (Figure 33) and nitrite (Figure 34) values obtained over <br />the period of record have been low with most being below detection limits (Appendix B). <br />' Elevated orthophosphate readings occurred in the summers of 1998 through 2000, at up- <br />' gradient well TR-I.S, possibly due to nearby agicultural activity. In 2001, concentrations of <br />orthophosphate returned to historically low levels. Site TR-4 had a slight rise in <br />' orthophosphate concentration during the 2005 monitoring period, but decreased to levels <br />similar to previous sampling events during the 2006 sampling season. Nitrite concentrations <br />' were again elevated at TR-1.5 in May 2000 and May 2001 and at WR-1 in May 2001, but <br />decreased to historical levels as the year progressed. Nitrite levels remained at historical <br />' levels in the 2006 monitoring period. Orthophosphate and nitrite analyzed values aze <br />provided in tabular format in Appendix B. <br />Chloride/Potassium <br />Chloride and Potassium (Figure 35) were added to the parameters list in 1994. <br />Potassium levels increased in TR-4 over the course of 2003, but have leveled off over the last <br />Few yeazs. Chloride at TR-4 spiked in both October 2004 and May 2005, however <br />concentrations returned to historical levels over the 2005 and 2006 monitoring periods. <br />Chloride and potassium analyzed values are provided in tabulaz format in Appendix B. <br />48 <br />