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Mr. Soon Kim <br /> Page 16 <br /> December 19, 1995 <br /> 4 Sulfate is converted to aqueous hydrogen sulfide in the degradation of BTEX. Figure 7 <br /> shows depressed levels (8.0 mg/L) of sulfate in the zone of significant contamination in <br /> contrast to 25 to 30 mg/L out side the zone. The values of 10.6 mg/L in the deep well MW- <br /> DIS-8D and 10.3 mg/L in MW-DIS-4 do not fit the expected pattern. <br /> The anaerobic fermentation of BTEX converts carbon dioxide into dissolved methane. Figure <br /> 8 shows slightly elevated dissolved methane levels in the zone of significant contamination. <br /> i <br /> i <br /> 1 <br /> 1 ; <br /> E <br /> i <br />