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1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />lJ <br /> <br />1 <br /> <br /> <br />1 <br />1 <br /> <br />these two parameters for the majority of the 1989 and 1990 monitoring periods <br />(Figure 14). In 1988, 1989, and 1990, a sharp increase in manganese <br />concentrations are noticed for the first portion of the annual monitoring <br />period, at WR-1, with a significant decrease occurring by the end of the year. <br />This may be a further indication of an annual flushing which may be occurring <br />in the spoils aquifer. <br />Orthophosphate (Figure 15) and nitrite (Figure 15) were added to the <br />monitoring program in 1988. All values obtained from 1988 through 1990 for <br />these parameters were low with most being below detection limits (Appendix 2). <br />V. SUAFACS NAT&R - GROUND 9PATHR INTERACTIONS <br />The interrelationship in concentrations of chemical parameters between the <br />surface waters and alluvial waters at the Edna Mine can only be suggested in <br />very general terms. The primary reasons for this are the relative location of <br />a given well to the creek, the source from which an alluvial well's water <br />originates and the fluvial dynamics of alluvial flow. <br />A general trend evident in TDS and the major ions is that as one progresses <br />downstream along the mine an increase in these parameters occurs in both the <br />surface water and alluvial water. While the trend appears in both waters, it <br />is not possible to determine to what extent the similar trends are related. <br />The topological change in the surface water from a calcium-bicarbonate type to <br />a calcium-sulfate type has been in existence for several years. However, the <br />same topological shift recently noticed in the alluvial wells appears to <br />coincide with the surface expression of the spring associated with the spoils <br />aquifer developed along the lower slopes of West Ridge. Although the spring <br />outflow is surficial in nature, the flow is not sufficient to cause a more <br />pronounced shift in the bicarbonate-sulfate balance in the surface water than <br />currently exists, but appears to exert sufficient influence on the alluvial <br />waters to cause a shift in the downstream alluvial water bicarbonate-sulfate <br />balance. <br />From the above relationships it appears the creek water and alluvial water <br />exhibit little influence upon each other due to the slow exchange rate. <br /> <br />