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0 Totals of gasoline range hydrocarbons removed by the vapor extraction system are as follows <br /> Thermal Oxidation destruction 74,849 pounds <br /> Carbon Adsorption 223 pounds <br /> Vent to atmosphere 9 8 pounds <br /> Total Removal 75,082 pounds or approximately 12,013 gallons <br /> Weekly bio-venting of MW-8 and MW-12 are being conducted by Lawrence Tank Testing <br /> Currently the groundwater is too high, no slotted casing is exposed above groundwater at MW12 to <br /> conduct bio venting As of March 31, 1998 the 2 hour once a week bio venting of MW-8 has <br /> removed a calculated 5 23 pounds of gasoline range hydrocarbons and a total of 484 pounds of <br /> hydrocarbons as gasoline and CO2 The average flow rate is 50 8 cfm, with a vapor stream <br /> consisting of TPHg of 0 04 mg/L and CO2 at 0 5%, see Table 5 and Appendix D <br /> Summary <br /> SOIL <br /> 0 Confirmation soil sample borings SB4, SB5, SB6 and SB7 were drilled and sampled (June 1997) <br /> near previous sample boring SBI, SB2 and SB3 (December 1988), see Figure 3 Charts were <br /> developed to show the reduction comparisons of the soil sample results, see previous report <br /> CONFIRMATION OF THE EFFECTS OF THE VAPOR EXTRACTION SYSTEM, dated July 31, <br /> 1997, Table 2 for results No MTBE was noted in any of the soil samples The following four <br /> comparisons are from the 50 foot depth, which is the depth of the historic highest concentrations <br /> 1 SB4 compared to SB 1 showed a 99 7% reduction of gasoline range hydrocarbons (TPHg), <br /> complete removal of benzene and toluene, and a 99 8% reduction of the xylenes <br /> 2 SB7 compared to MW2 and MW3 respectively showed the following reductions TPHg at 96 9% <br /> and 99%, Benzene and Toluene complete removal, and Xylenes at 90 5% and 99% <br /> 3 SB5 compared to MW2 and MW3 respectively showed the following reductions TPHg at <br /> 98 38% and 99 48%, Benzene, Toluene and Ethylbenzene complete removal, and Xylenes at <br /> 96 29% and 99 61% <br /> 4 SB6 compared to SB3 (highest noted contaminated area) and MW10 respectively showed the <br /> following reductions TPHg at 99 2% and 96 6%, Benzene, Toluene and Xylenes complete <br /> removal <br /> 5 8603 Update#515/98 <br />