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F <br /> ion of ContaminationJanuary 3, 1989 <br /> Texaco Service Station, Manteca, California AGS 38053-1 <br /> ely above the sampling depth and then driving the sampler <br /> undisturbed native soil through the hollow stem of the <br /> auger. The sampler was driven 18 inches with a standard <br /> 140-pound hammer dropped 30 inches. The number of blows required <br /> to drive the sampler each successive G--inch interval was counted <br /> and recorded to provide an indication of soil consistency. <br /> A portable organic vapor analyzer (OVA) was used in the field to <br /> evaluate the relative levels of contamination in each sample. <br /> Immediately after each sample was collected, the intake of the <br /> OVA was pressed against the soil and the reading was obtained. <br /> The readings obtained from each sample are presented on the Logs <br /> of borings (Plates P-4 through P-9) . <br /> Samples selected for laboratory analyses were removed from the <br /> sampler and sealed with aluminum foil, plastic caps, and airtight <br /> tape. The samples were then labeled and placed in iced storage <br /> ' for transport to the analytical laboratory. Chain of Custody <br /> Reco;:ds were initiated by the Field geologist and accompanied the <br /> samples to the laboratory. Copies of those records are included <br /> in the Appendix to this report. <br /> w: <br /> 8 <br /> A'piv/iecF 4G4?0SVWems <br />