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C1 previous years, except for WR-1 (Figure 12). At wR-1 a sharp increase in manganese concentrations are noticed for the first portion of the annual monitoring period with a significant decrease occurring by the end of the ' year. V. Surface Water - Ground Water Interactions 1 The interrelationship in concentrations of chemical parameters between the surface waters and alluvial waters at the Edna Mine can only be suggested in very general terms. The primary reasons for this are the relative location of ' a given well to the creek, the source from which an alluvial well's water originates and the fluvial dynamics of alluvial flow. ' A general trend evident in TDS and the major ions is that as one progresses downstream along the mine an increase in these parameters occurs in both the surface water and alluvial water. While the trend appears in both waters, it ' is not possible to determine to what extent the similar trends are related. The topological change in the surface water from a calcium-bicarbonate type to ' a calcium-sulfate type has been in existence for several years. However, the same topological shift recently noticed in the alluvial wells appears to ' coincide with the surface expression via the spring associated with the spoils aquifer developed along the lower slopes of West Ridge. Although the spring outflow is surficial in nature, the flow is not sufficient to cause a more pronounced shift in the bicarbonate-sulfate balance in the surface water than currently exists, but appears to exert sufficient influence on the alluvial ' waters to cause a shift in the downstream alluvial water bicarbonate-sulfate balance. ' From the above relationships it appears the creek water and alluvial water exhibit little influence upon each other due to the slow exchange rate. ' xowever, surface water from sources outside the creek which contact the alluvium in passage to the creek may have an effect on alluvial water. 1 1