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Chevron/Stockton g <br /> November 1989 <br /> SOIL SAMPLING <br /> Once the GTI field representative determines that the <br /> excavation can or should no longer be extended in a given <br /> w direction, soil samples for laboratory analyses will be <br /> collected. Soil samples will be collected at the discreticn of <br /> the GTI representative on site. Figure 3 shows an anticipated <br /> grid pattern that would be used to determine sample locations <br /> taken for field-headspace analyses if the excavation proceeds as <br /> anticipated, but if the GTI field representative determined it <br /> necessary, more samples would be collected from the bottom of <br /> each excavation pit. Based on the field-headspace readings and <br /> on other field observations, selected soil samples will be <br /> collected for laboratory analyses. Samples will be selected in <br /> such a way as to determine if the excavation has reached the <br /> f-w <br /> limits of hydrocarbon content in the accessible soil. Samples <br /> for laboratory analyses will be collected in 2-inch-diameter by <br /> 6-inch-lone} brass sample tubes. Sample tubes will be sealed with <br /> aluminum foil, capped and the caps wrapped with plastic tape to <br /> h. produce an air-tight seal. Samples will then i:a labeled and <br /> stored on ice for transportation to the state-certified GTEL <br /> �w Environmental Laboratories, Inc. (GTEL) facility in Concord, <br /> California under Chain--of-Custody Manifest. <br /> Standard Operating Procedures 14, 15 and 40 describe <br /> applicable soil sampling procedures, and SOP 11 describes chain- <br /> of-custody procedures (See Appendix B) . <br /> Soil samples will be analyzed for the presence of BTEX and { <br /> TPH-as-gasoline using modified U.S. Environmental Protection <br /> M+ Agency (FPA) Methods 5030/802018015. Samples taken from the <br /> ----- --------vicinity -oi the waste-oil-tank--will--also be -analyzed -for the------- <br /> presence <br /> he- --presence of TPH-Es-diesel using £A.A Method 8015, for the presence <br /> of total oil-and-grease (TOG) using EPA Method' 3550/APHA SM 503 <br /> LL��,,Gknrxuu.tirt:k <br />