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Site Investigation Report <br /> BP Oil Site No 11191 <br /> C A M B R I A Stockton March291Eornia 2002 <br /> Permits SCJCPHS Permit No 0028110 was issued for the installation of wells <br /> MW-1 through MW-4 (see Appendix C) <br /> Drilling Company V&W Drilling, Inc (V&W) of Isleton, California (C-57 License <br /> No 720904) <br /> Drilling Dates December 10, 2001 to December 12, 2001 <br /> Drilling Method Drill rig equipped with 8-inch diameter hollow stem augers (MW-1, <br /> MW-2 and MW-4) and 10-inch diameter hollow stem augers (MW-3) <br /> Boring Depths Wells MW-1 through MW-4 were advanced to 60 feet bgs <br /> Sampling Method Wells MW-1 through MW-4 were sampled at 5-foot intervals using a <br /> modified California split spoon sampler <br /> Groundwater Depths During drilling, groundwater was first observed at approximately 40 to <br /> 45 feet bgs in wells MW-1 through MW-4 On January 3, 2002, the <br /> static depth to water in wells MW-1 through MW-4 was between <br /> 47 and 49 feet bgs (see Table 2) <br /> Soil Types Encountered Soils encountered consisted of silty clay, clayey and sandy silts, sandy <br /> gravels, silty and gravelly sands, and sands to the total depth explored <br /> of 60 feet bgs (see Appendix D) <br /> Chemical Analysis Selected soil samples were analyzed for total petroleum hydrocarbons <br /> as gasoline (TPHg) using modified EPA Method 8015, and for either <br /> benzene, toluene, ethylbenzene, xylenes (BTEX) and MTBE using <br /> EPA Method 8021, or BTEX, MTBE, TBA, 1,2-dichloroethane <br /> (1,2-DCA), and 1,2-dibromoethane (EDB) using EPA Method 8260 <br /> by Pace Analytical Services, Inc of Houston, Texas (Pace) Soil <br /> analytical results are summarized on Table 3 and presented in <br /> Appendix E <br /> 4 <br />