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1 The groundwater samples were delivered to Sequoia Analytical and analyzed for TPH-g by Cal <br /> EPA-modified EPA Method 8015 and for BTEX by EPA Method 8020 Table 2 lists the <br /> analytical results for this quarter (in boldface type) and for all previous quarterly samplings <br /> TPH-g was detected in the samples collected from MW3, MWS, and MW7, at concentrations of <br />' 290,ug/L, 85 �tg/L, and 92 µg[L Benzene was detected in the sample collected from MW5, at a <br /> concentration of 1 3 µglL No TPH-g or BTEX compounds were detected in the samples <br /> collected from MW 1, MW2, MW4, or MW6 The results are shown in Figure 1 Laboratory <br />' data sheets and chain-of-custody documentation are presented as Appendix C <br /> 3. REMEDIATION SYSTEM STATUS <br /> A soil vapor extraction system was installed at the site by a previous consultant (Fugro) and <br />' operated for approximately 5 months, from November 1995 to March 1996 Laboratory <br /> analytical results for samples of the extracted soil vapor collected by Fugro are shown in the <br /> following table <br /> Date TPH- Benzene g e zene Toluene Ethyl Total <br />' ppmv ppmv ppmv Benzene Xylenes <br /> ppmv ppmv <br /> 11/13/95 5,700 100 69 18 83 <br /> 11/13/95 6,000 110 43 8 3 39 <br /> 11/20/95 1,500 19 64 13 78 <br /> 12/04/95 1,000 66 40 9 0 49 <br /> 01/03/96 680 35 26 4 9 44 <br /> 02/05/96 426 08 101 4 6 439 <br /> 03/04/96 2558 ND 67 3 5 277 <br /> A new soil vapor extraction (SVE) system has been installed by EA and was started upon <br /> inspection by the San Joaquin Valley Unified Air Pollution Control District on 21 February 1997 <br /> Soil vapor is extracted out of only two wells (VEW l and VEW2), because the screened intervals <br /> for the other three vapor extraction wells (MW2, MW3, and MW5) are completely submerged by <br /> the water table Laboratory analytical results for samples of the extracted soil vapor collected by <br />' EA are shown in the following table <br /> WP61 70137 Q197 TX 2 2 <br />