REP13938 - Laserfiche WebLink

Home Browse Search

V. SURFACE WATER -GROUND WATER INTERACTIONS The interrelationship in concentrations of chemica.] parameters between the surface waters and alluvial waters at the Edna Mine can only be suggested in very general tenns. The primary reasons for this aze [he relative location of a given well to the creek, the source from which an alluvial well's water originates and the dynamics of alluvial flow. Prior to 1995, a geneml trend evident in TDS and the major ions was that as one progressed downstream along the mine an increase in these parameters occurred in both the surface water and alluvial water. Beginning in 1995, the levels of all constituents in TR-1.5 increased dramatically. While the influence of this increase in upstream alluvial water is not clearly expressed in either surface or alluvial water downstream for the majority of [he year, the elevated concentrations of surface water constituents observed in the early portion of the year are more pronounced than previously. This is probably a reflection of the co-mingling of alluvial water in the vicinity of TR-1.5 with creek water upstream of TR-B. The independent nature of the observations and trends occurring within the creek water and alluvial water suggests the two water bodies have limited influence upon each other. The lack of influence is probably due to the slow exchange mte of water between the two bodies during most of the year. VI. QUALITY ASSURANCE Three duplicate samples were collected during 2005 for laboratory quality assurance purposes. The duplicate samples were taken at surface water monitoring sites TR-B in April, TR-B in August, and TR-C in October. Results of the duplicate analyses were favorable for most of the parameters tested. The April duplicate for TR-B showed 11 out of 15 laboratory parameters to be within the acceptable range (5%) of the original values obtained. The duplicate sample value for calcium was 94% of the original value (57.3 mg/I-original vs. 54.0 mg/I-duplicate). The duplicate sample value for iron was 82% of the original value (0.11 mg/I-original vs. 0.09 mg/1- duplicate). The duplicate sample value for manganese was 323% of the original value (0.013 mg/1-original vs. 0.042 mg/I- duplicate). The duplicate sample value for potassium was 94% of the original value (l.8 mg/1-original vs. 1,7 mg/I- duplicate). The August duplicate for TR-B showed 12 out of 15 parameters to be within the acceptable range of the original value obtained. The duplicate value for aluminum was 75% of the original value (0.04 mg/1-original vs. 0.03 mg/1- duplicate). The duplicate sample value for manganese was 94% of the original value (0.017 mg/1-original vs. 0.016 mg/1- duplicate). The duplicate sample value for potassium was 92% of the original value (13 mg/1-original vs. 1.2 mg/1- duplicate). The October duplicate for TR-C showed ]0 out of IS pazameters to be within the acceptable range of the original value obtained. The duplicate sample value for iron was 71% of the original value (0.14 mg/1-original vs. 0.10 mg/1- duplicate). The duplicate sample value for manganese was 122% of the original value (0.027 mg/1-original vs. 0.033 mg/I- duplicate). The duplicate sample value for chloride was 200% of the original value (1 mg/1-original vs. 2 mg/1-duplicate). The duplicate sample value for total dissolved solids was 108% of the original value (250 mg/l-original vs. 270 mg/1- 46