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IMI- <br /> I <br /> I <br /> Y <br /> f <br /> July 28, 1988 AGS Job No. 38012-2 <br /> Former UNOCAL Service Station, Stockton, California <br /> r^+ <br /> During drilling, soil samples were collected at 5-foot intervals <br /> using a California-modified, split-spoors sampler equipped with <br /> clean brass sleeves. Samples were collected by advancing the <br /> boring to a point immediately above the sampling depth, then <br /> driving the sampler into the native soil through the hollow <br /> center of the auger. The sampler was driven 12 inches with a <br /> r". <br /> standard 140-pound hammer dropped 30 inches. The number of blows <br /> required to drive the sampler each successive 6-inch interval was <br /> counted and recorded to give an indication of soil consistency. <br /> Samples were identified using the Unified Soil Classification <br /> System, which is summarized on Plaice P-4. Descriptions of the <br /> materials encountered are presented in the Logs of Boring, Plates <br /> P-5 through P-10. <br /> Samples selected for chemical analysis were sealed with aluminum <br /> foil, plastic caps, and airtight tape. The samples were then <br /> labeled and immediately placed in iced storage for transport to <br /> the analytical laboratory for testing. Chain of custody Records <br /> were initiated by the geologist and accompanied the samples to <br /> the laboratory_ Copies of -_hese records are included in Appendix <br /> A of this report. <br /> 10 <br /> APPI ed Ge0SySAMS <br />