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• sulfate value at TR-4 of 2165 mg/1 in August 1992 are believed to be <br />analytical errors as the sample points before and after the sample dates are <br />more consistent with overall trends. <br />Dissolved Iron/Manganese <br />Dissolved iron (Figure 31) and manganese (Figure 32) levels for the <br />three alluvial wells remained low during 1995 as in previous years. However, <br />fluctuations in concentrations for both parameters began to occur during 1994 <br />and 1995 at TR-1.5. The fluctuations appear to be related to the other <br />parameter changes at this location, but are less pronounced. A decreasing <br />trend for both iron and manganese appears to have occurred at all of the other <br />locations, except for TR-3 (iron) and 41R-1 (manganese), over the past decade <br />with a state of equilibrium being reached in 1990. Iron has typically shown a <br />seasonal fluctuation at TR-3, except during 1994 and 1995. This pattern is <br />not clearly understood, but may be related to the mining activity in the <br />Moffat area. It is interesting that WR-1 often contains the lowest values for <br />dissolved iron for the majority of the time beginning in 1990. <br />. Since 1988, a sharp increase in manganese concentration has been noticed <br />for the first portion of the annual monitoring period at WR-1 with a <br />significant decrease occurring by the end of the year. This may be a further <br />indication of an annual flushing which may be occurring in the spoils aquifer. <br />Orthophosphate/Nitrite <br />• <br />Orthophosphate (Figure 33) and nitrite (Figure 34) were added to the <br />monitoring program in 1988. All values obtained from 1988 through 1995 for <br />these parameters have been low with most being below detection limits <br />(Appendix B). Fluctuations in the concentration of these parameters also <br />began to occur during 1994 at TR-1.5. <br />Chloride/Potassium <br />Chloride and Potassium (Figure 35) were added to the parameters list in <br />1994. Due to the short record for these parameters, any trend analyses for <br />these parameters is considered speculative. However, the differences between <br />the various sites appear to mimic the patterns observed among the other <br />parameters. <br />42 <br />