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Table 4 <br /> Summary of MW-lA Reduction of Constituent Levels <br /> ' June 1998 to March 2004 <br /> Benzene Toluene Ethyl Total TPH-Gas <br /> ' µg/L µg/L Benzene Xylenes mg/L <br /> µ L <br /> 6/19/98 3500 3300 890 2700 37 <br /> ' 9/22/98 680 150 130 3000 17 <br /> Percent Decrease <br /> Between Sampling 80.57% 95.45% 85.39% -11.11% 54.05% <br /> Events <br /> ' 9/22/98 680 150 130 3000 17 <br /> 12/18/98 420 10.4 36 300 8.4 <br /> Percent Decrease <br /> Between Sampling 38.24% 93.07% 72.31% 90.00% 50.59% <br /> Events <br /> ' 12/18/98 420 10.4 36 300 8.4 <br /> 3/16/99 300 5 46 85 4.5 <br /> Percent Decrease <br /> Between Sampling 28.57% 51.92% -27.78% 71.67% 46.43% <br /> Events <br /> M3/16/99 300 5 46 85 4.5 <br /> 6/15/99 150 5.3 22 18 3.8 <br /> Percent Decrease <br /> Between Sampling 50.00% -6.00% 52.17% 78.82% 15.56% <br /> ' Events <br /> 6115199 150 5.3 22 18 3.8 <br /> 03/24/04 25 1.4 7.3 3.2 0.87 <br /> Percent Decrease <br /> Between Sampling 83.33% 73.58% 66.81% 82.22% 77.10% <br /> ' Events <br /> 6/19/98 3500 3300 890 2700 37 <br /> ' 03/24/04 25 1.4 7.3 3.2 0.87 <br /> Overall Percent 99.28% 99.95% 99.18% 99.88% 97.64% <br /> Decrease <br /> Note: Negative numbers denote increases. <br /> American Geological Service,Inc. <br /> CA95DE-029 12 <br />