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1 <br />The concentrations of conventional water quality parameters in the deep downgradient <br />well (MW -1) were similar to those for the deep upgradient wells (MW -2 and MW -3). <br />The concentrations were generally higher in MW -2 than in MW -3, and in several <br />instances, the concentrations in MW -2 exceeded those in MW -1. <br />The concentrations of conventional water quality parameters in the shallow <br />downgradient wells (MW -4 and MW -5) were generally similar to those in the shallow <br />upgradient well (SB -1). However, the concentrations of chloride, EC, sulfate, and <br />TDS in MW -4 were somewhat higher than the concentration in SB -1; chloride was 390 <br />mg/1 as compared to 80 mg/l; EC was 2,600 umhos/cm as compared to 1,200 <br />umhos/cm; sulfate was 700 mg/1 as compared to 53 mg/l; and TDS was 1,800 mg/1 as <br />compared to 630 mg/l. <br />In summary, the concentrations of organics, metals, and conventional water quality <br />parameters detected in the deep downgradient well (MW -1) were similar to those <br />detected in the deep upgradient wells (MW -2 and MW -3). Therefore, the landfill does <br />not appear to have impacted the ground -water quality of the deep regional aquifer. <br />No organics were detected in either the downgradient or upgradient shallow wells (MW - <br />4, MW -5, and SB -1). The concentrations of calcium, magnesium, chloride, EC, <br />sulfate, and TDS detected in the shallow downgradient well (MW -4) were greater than <br />two tunes the concentrations detected in the shallow upgradient well (SB -1). Although <br />these constituents are present in MW -4 in slightly elevated concentrations, they are not <br />considered significant and are probably representative of the natural variability in water <br />quality within the shallow perched aquifer. The concentrations of metals and <br />conventional water quality parameters detected in the other shallow downgradient well <br />(MW -5) were similar to those detected in the shallow upgradient well (SB -1). <br />4.3.2 Vadose Zone Soil Samples <br />Landfill impacts on the vadose zone soils are evaluated by comparing the chemical <br />characteristics of soil samples collected from upgradient and downgradient soil borings. <br />Shallow soil samples were collected during the drilling of MW -1, MW -2, MW -4, MW - <br />TL 9390314 24 1 M'6n <br />