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,CAMBRIA <br /> Screened Interval: Well VE-3 is screened from 35 to 45 fbg Well construction <br /> details are presented on Table 1 and recorded on the exploratory <br /> boring logs (Appendix C) <br /> Hydrocarbon Distribution in Soil: No TPHg, BTEX, or MTBE were detected in soil samples <br /> collected from boring VE-3 Tertiary butanol was detected at 1 1 ppm at 15 5 fbg It was not <br /> detected in deeper soil samples No other fuel oxygenates were detected in soil from this bonng <br /> The soil chenucal analytical data are summarized to Table 4 and the TPHg, benzene, and MTBE <br /> concentrations are presented on Figure 2 In addition,the soil chemical analytical data from well <br /> MW-5 (SB-2) are shown on Figure 2 for comparison with the soil analytical data from VE-3 <br /> Laboratory analytical data are included in Appendix B <br /> CONCLUSIONS <br /> Over the 5-day SVE test period, MTBE concentrations decreased an order of magnitude (280 to <br /> 20 ppmv), while TPHg concentrations were decreased by 60% (520 to 210 ppmv) Figure 4 <br /> illustrates the vapor concentration decrease over the test period <br /> Well VE-3 was installed as a soil vapor extraction well and a confirmation boring Soil data <br /> collected from this well boring, located adjacent to MW-5, demonstrate the effectiveness of the <br /> SVE test MTBE was not detected in soil from this boring <br /> The decrease in vapor concentrations and the soil analytical results suggest a substantial <br /> depletion of source material The source area depletion should effectively nutigate MTBE <br /> migration to groundwater <br /> 1346 9 <br />