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<br />by the end of the year. This may be a further indication of an annual <br />flushing which may be occurring 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 1991 for <br />' these parameters were low with most being below detection limits (Appendix 2). <br />V. SURFACE WATER - GROUND WATER INT&RACTIONS <br />' The interrelationship in concentrations of chemical parameters between <br />the surface waters and alluvial waters at the Edna Mine can only be suggested <br />' in very general terms. The primary reasons for this are the relative location <br />of 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 <br />progresses downstream along the mine an increase in these parameters occurs in <br />' both the surface water and alluvial water. While the trend appears in both <br />waters, it is not possible to determine to what extent the similar trends are <br />' related. The topological change in the surface water from a calcium- <br />bicarbonate type to a calcium-sulfate type has been in existence for several <br />' years. The same topological shift recently noticed in the alluvial wells <br />appears to coincide with the surface expression of the spring associated with <br />the spoils aquifer developed along the lower slopes of West Ridge. Although <br />the spring outflow is surficial in nature, it is not sufficient to cause a <br />more pronounced shift in the bicarbonate-sulfate balance in the surface water <br />' than currently exists. It does appear to exert sufficient influence on the <br />alluvial waters to cause a shift in the downstream alluvial water bicarbonate- <br />, sulfate balance. <br />From the above relationships it appears the creek water and alluvial <br />water exhibit little influence upon each other due to the slow exchange rate. <br />However, surface water from sources outside the creek which contact the <br />alluvium in passage to the creek may have an effect on alluvial water. <br /> <br />1 <br /> <br />