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<br />l V. SURFACE WATER - GROVND WATER INTERACTIONS <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 lccation <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 />VI. QUALITY ASSURANCE <br />Four duplicate samples were collected during 1992 for laboratory quality <br />' assurance purposes. The duplicate samples were taken at surface water <br />monitoring sites TR-A in April, TR-C in August, and at TR-B in October (sample <br />date in Appendix IZ with an * indicates a duplicate sample); and at ground <br />water site TR-3 in May. Results of the duplicate analyses were favorable for <br />most of the parameters tested. The April duplicate for TR-A showed 11 out of <br />1 <br />23 <br />