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L <br />1 <br />r <br />C <br />i <br />analytical results of the soil and ground -water samples collected during the earlier <br />installation of MW -1 (EMCON, January 1988) are included in the tables for <br />comparison. The ground -water results from the two sampling events for MW -1 are in <br />good agreement. <br />4.3.1 Ground Water <br />Landfill impacts on ground water are evaluated by comparing the chemical <br />characteristics of the ground water collected from the upgradient wells with ground <br />water collected from the downgradient monitoring wells, in both the deep regional <br />aquifer and the shallow perched aquifer. <br />No volatile, semivolatile, or organochlorine pesticide/PCB compounds were detected in <br />the deep upgradient wells (MW -2 and MW -3). The deep downgradient well (MW -1) <br />contained 19 ug/1 of bis (2-ethylhexyl) phthalate. As previously discussed, the results <br />of the laboratory blank sample analyzed along with this sample also indicated the <br />presence of bis (2-ethylhexyl) phthalate at 77 ug/l; therefore, this compound appears to <br />be a laboratory contaminant introduced during the analytical process. <br />No volatile, semivolatile, or organochlorine pesticide/PCB compounds were detected in <br />the shallow upgradient well (SB -1) or the shallow downgradient wells (MW -4 and MW - <br />5). <br />The concentrations of metals in the deep downgradient well (MW -1) were similar to <br />those in the deep upgradient wells (MW -2 and MW -3). The concentrations of detected <br />metals were generally higher in MW -2 than in MW -3, and in several instances, the <br />concentrations in MW -2 exceeded those in MW -1. <br />The concentrations of metals in the shallow downgradient wells (MW -4 and MW -5) <br />were similar to those for the shallow upgradient well (SB -1). There were only two <br />instances when the metal concentrations in the downgradient well were somewhat <br />higher than those of the upgradient well; calcium was detected at 200 mg/I in MW -4 as <br />compared to 85 mg/1 in SB -1, and magnesium was detected at 72 mg/1 in MW -4 as <br />compared to 30 mg/1 in SB -1. <br />STL 9390314 2 3ER1��T1 %S0 /300 0 <br />