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July 2, 1998 <br /> Total removal of TPH-g by soil vapor extraction and venting ofMW8 was calculated as 75,088 <br /> pounds (12,014 gallons) <br />' December 1998 <br /> SVE operations discontinued <br />' February 5, 1999 <br /> No further action requested by BEII based upon removal of subsurface petroleum, shrinkage of <br /> the dissolved petroleum plume in groundwater and anticipated spatial stabilization of the residual <br />' dissolved petroleum mass <br /> 5.0) SOIL CONFIRMATION TESTING <br /> In June 1997, confirmation soil sample bon�s SB4, S135 SB6 and S87 were drilled and sampled <br /> near previous soil borings SBI, SB2 and SB3 (Installed in December 1988) Charts were developed <br />' to show the reduction comparisons of the soil sample results, see previous report CONFIRMATION <br /> OF THE EFFECTS OF THE VAPOR EXTRACTION SYSTEM, dated July 31, 1997, Table 2 for <br /> results No MTBE was noted in any of the soil samples <br /> 1 The following confirmation soil <br /> test results from 50 below grade, the depth of the historic highest <br /> concentrations,identify completed removal of benzene in every case and greater than 90% attenuation <br /> of total petroleum hydrocarbons and toluene in every case <br />' i SB4 compared to SB 1 showed a 99 7% reduction of gasoline range hydrocarbons (TPR-g), <br /> complete removal of benzene and toluene, and a 99 8% reduction of the xylenes <br />' 2 SB7 compared to MW2 and MW3 showed the following reductions TPH-g at 96 9% and 99%, <br /> benzene and toluene complete removal, and xylenes at 90 5% and 99%, respectively <br /> I 3 SB5 compared to MW2 and MW3 showed the following reductions TPH-g at <br /> 98 38% and 99 48%, benzene, toluene and ethylbenzene complete removal, and xylenes at <br /> 96 29% and 99 61%, respectively <br />' 4 SB6 compared to SB3 (the highest noted contaminated area) and MW 10 showed the <br /> following reductions TPH-g at 99 2% and 96 6%, benzene, toluene and xylenes complete <br /> removal, respectively <br /> It is felt that through soil vapor extraction and the limited over-excavation of impacted soil near the <br /> UST area has been removed and the soils portion of the remedial action efforts has been <br /> accomplished <br /> The original estimated mass of soil contan-unation is taken from the results of the sampling of the <br /> base of the tank pit excavation and the sampling of soil borings SB 1 through SB3 and monitoring <br /> 4 <br /> f <br />