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Co-extraction Well In,lallat,on Report November4, 1997 • ' 32 Laboratory QA/QC OST contracted Entech Analytical Labs, Inc (ENTECH) an analytical laboratory certified by ' the State of California Waste Testing Laboratory Certification Program,to perform the specified tests The methods used by the laboratory are approved analytical methods incorporating QA/QC practices The laboratory provided the appropriate QA/QC documents which are ' presented with the certified analytical results in Appendix D ' 4.0 PERMITTING i A Well Permit for this investigation was obtained from the SJCPHS prior to implementing field ' work A copy of this permit is presented in Appendix E A copy of this permit was kept at the site during fieldwork 5.0 RESULTS ' The following section presents the analytical results from the soil sampling One soil sample was collected from each boring ' • 51 Soil Analytical Results ' The 4 soil samples submitted for analyses, were collected from depths of 161/z to 17 feet bgs Laboratory analyses indicated that MTBE was not detected in any of the samples TPHg and BTEX were not detected in the samples from borings EW-2 and EW-4 In the samples from ' boring EW-1 and EW-3, low concentrations of TPHg and BTEX were detected The results of the laboratory analyses of the soil samples are presented in Table 2 Copies of the certified analytical reports are provided in Appendix D 6.0 CONCLUSIONS ' The following sections present conclusions with respect to soil analytical results and the observed conditions at the site 6.1 Soil ' Field observations and the results of laboratory analyses indicate that concentrations of gasoline related compounds appear to be confined to the soil ranging from 5 to 10 feet bgs and from 15 ' to 20 feet bgs Laboratory analytical results also indicate that TPHg, BTEX and MTBE were not detected in the single soil samples collected from EW-2 and EW-4, which are the wells most ' OST coexwell rpt 4