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<br /> <br /> <br /> <br /> <br /> <br /> <br />LJ <br /> <br /> <br />1~ <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />caused by the spoils spring discharge where leaching of pyritic and organic <br />sulfur occurs as the flow passes through the spoils. The bicarbonate values <br />for TR-4 of 895 mg/1 obtained during May 1990 and of 2165 mg/1 in August 1992, <br />are believed to be an analytical error as the sample points before and after <br />the sample date are consistent with earlier trends. The bicarbonate duplicate <br />sample value of 106 mg/1 also suggests that this value is erroneous. <br />Dissolved Iron/Manganese <br />Dissolved iron and manganese levels for the three alluvial wells remained low <br />during 1992 as in previous years (Figure 11). A decreasing trend may be <br />occurring for both iron and manganese at all locations but WR-1. It is <br />interesting that WR-1 often contains the lowest values for these two <br />parameters for the majority of the 1989, 1990 and 1991 monitoring periods <br />(Appendix 2). Since 1988, a sharp increase in manganese concentrations has <br />been noticed for the first portion of the annual monitoring period, at WR-1, <br />with a significant decrease occurring by the end of the year. This may be a <br />further indication of an annual flushing which may be occurring in the spoils <br />aquifer. <br />Orthophosphate and nitrite (Figure 12) were added to the monitoring program in <br />1988. All values obtained from 1988 through 1992 for these parameters were <br />low with most being below detection limits (Appendix 2). <br />20 <br /> <br />