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<br /> <br /> <br />1 <br />1 <br /> <br />OrthophosphateMitri to <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, TR-I.5 orthophosphate and nitrite concentrations began <br />rising in 1998 with nitrite concentrations peaking in May 1999 and orthophosphate concenimtions peaking in May 20(10. <br />Subsequent samples collected from TR-1.5 show a decrease in both orthophosphate and nitrite. Concentrations in TR-I.5 <br />remain above historical values. The orthophosphate concentration in WR-I was elevated over historical values in October <br />2000. The reason for these results is not readily identifiable: however, onz contributing factor may be the proximity to active <br />agricultural land. <br />Chloride/Potassium <br />Chloride and Potassium (Figure 35) were added to the parameters list in 1994. While any trznd analyses for these <br />' parameters is considered speculative some observations can be made. Fluctuations in the concentrations of these parameters <br />for each location are consistent with the Fluctuations observed in other parameters for each given location. <br /> <br /> <br />lJ <br /> <br /> <br /> <br />1 <br /> <br /> <br />43 <br />