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_ c- . .-�4�' �� _ k •mss.-,--h-R.r� � <br /> i . <br /> Cheirron/South Center 10 <br /> November 1989 <br /> -gasoline, as confirmed by laboratory analyses of one soil sample <br /> per 50 cubic yards of excavated soil, the soil will be used to <br /> backfill the excavation. <br /> SOIL SAMPLING <br /> If no evidence of soil contamination is obs-erved, soil. <br /> samples -'ill be collected from beneath the rem,aved underground <br /> storage tanks. The location of these samples are shown on Figure <br /> 3. If additional soil removal takes place, than soil samples <br /> - will be collected as outlined below once the field supervisor <br /> determines that the excavation can or should no longer be <br /> extended in a given direction. <br /> Soil samples will be collected at the discretion of the site <br /> supervisor with a minimum of eight samples being ccllected, two <br /> from each side of the excavation. Based on field-headspace <br /> i <br /> analyses and other field observations, selected soil samples will <br /> be collected for laboratory analyses. Samples will be selected <br /> in such a way as to confirm that the excavation has reached the <br /> limits of hydrocarbon contamination in the accessible soil. <br /> Samples for laboratory analyses will be collected in 2-inch- <br /> �"' diameter by 6-inch-long brass sample tubes. The sample tubes <br /> will be sealed with aluminum foil, capped, and wrapped with <br /> ., plastic tape to produce an air-tight seal. Samples will then be <br /> labeled and stored on ice for transportation to California-state <br /> certified GTEL Environmental Laboratories, Inc. (GTEL) in <br /> - Concord, California under Chain-of-Custody Manifest. <br /> - Groundwater Technology, Inc. Standard operating Procedures <br /> 19, 15 and 40 describe applicable soil-sampling procedures, and <br /> SOP 31 describes chain-of-custody protocols (Appendix B) . <br /> ...�j �.L GROi'NDWATER <br /> TECHNOLOGY,INZ <br /> nr <br />