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1 <br /> 5.6 Subsurface Soil Vapor Laboratory Results <br /> Laboratory test results of vapor samples analyzed during this investigation are included in Table <br /> VI following <br /> TABLE VI <br /> RESULTS OF VAPOR SAMPLE ANALYSES <br /> ' SAMPLED SEPTEMBER 29, 1992 <br /> EPA Method <br /> ' Sample Date <br /> Number Analyzed 8020 8015 <br /> Benzene* Toluene Ethyl- Total TPH <br /> ' (PPMV) (PPmo) benzene Xylenes Gasolene <br /> (PPmi') (PPmo) (PPMT) <br /> MW-1-P 10110 - 11192 22 2 7 ND 1 8 2,000 <br /> MW-2 10110- 11192 200 31 7 6 27 24,000 <br /> MW-2-P 10110- 11192 030 073 062 0 34 1,300 <br /> VEW-I-P 10110- 11192 14 14 1 1 16 790 <br /> MW-3-P 10110 - 11192 33 17 4 1 5 8 12,000 <br /> MW-1 10110 - 11192 39 22 5 5 11 12,000 <br /> Detection 0 31 027 0 23 0 23 24 <br /> Limits <br /> *ppmv Parts per million by volume <br /> ' The vapor extraction treatability laboratory laborato test results showed that the soil vapors extracted <br /> from the wells at the site have elevated levels of TPH Petroleum hydrocarbon concentrations <br /> ' in soil vapors ranged from 790 parts per million by volume (ppmv) of TPH in VEW-1-P to <br /> 24,000 ppmv TPH in MW-2 BTEX concentrations ranged from 0.34 ppmv as xylene to 200 <br /> ppmv as benzene Certified laboratory results are presented in Appendix F <br /> 1 <br /> The following information is presented in Section 4 3, Table H Vacuums in wells at the <br /> vacuum source ranged from approximately 21--48 inches of water Vacuum pressures measured <br /> in adjacent wells during the vapor purging of test wells ranged from 0 1 inches of water to 0 7 <br /> inches of water The relatively low vacuum pressures detected in the source wells and the <br /> ' vacuums detected from as far as 130 feet away from the vacuum source indicates that,the vadose <br /> zone soils have a high permeability for transmitting vapors <br /> B 1125]1 RPT 14 <br />