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V. SURFACE WATER -GROUND WATER INTERACTIONS <br />The interrelationship in concentrations of chemical parameters between the surface <br />waters and alluvial waters at the Edna Mine can only be suggested in very general terms. The <br />primary reasons for this are the relative location of a given well to the creek, the source from <br />which an alluvial well's water originates and the dynamics of alluvial flow. <br />Prior to 1995, a general trend evident in TDS and the major ions was that as one <br />progressed downstream along the mine an increase in these parameters occurred in both the <br />surface water and alluvial water. Beginning in 1995, the levels of all constituents in TR-1.5 <br />increased dramatically. While the influence of this increase in upstream alluvial water is not <br />clearly expressed in either surface or alluvial water downstream for the majority of the year, <br />the elevated concentrations of surface water constituents observed in the early portion of the <br />year are more pronounced than previously. This is probably a reflection of the co-mingling of <br />alluvial water in the vicinity of TR-1.5 with creek water upstream of TR-B. <br />The independent nature of the observations and trends occurring within the creek <br />water and alluvial water suggests the two water bodies have limited influence upon each <br />other. The lack of influence is probably due to the slow exchange rate of water between the <br />two bodies during most of the year. <br />VI. QUALITY ASSURANCE <br />Three duplicate samples were collected during 2006 for laboratory quality assurance <br />purposes. The duplicate samples were taken at surface water monitoring sites TR-B in April, <br />TR-C in August, and TR-B in October. Results of the duplicate analyses were favorable for <br />most of the parameters tested. <br />The April duplicate for TR-B showed 13 out of 15 laboratory parameters to be within <br />5% of the original values obtained. The duplicate sample value for iron was 111% of the <br />original value (0.09 mg/1-original vs. 0.1 mg/l-duplicate). The duplicate sample value for <br />manganese was 93% of the original value (0.014 mg/I-original vs. 0.013 mg/1-duplicate). <br />The August duplicate for TR-C showed 12 out of 15 parameters to be within 5% of the <br />52 <br />