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OCT i3W1 <br /> 0 XETHODS <br /> 1=hVIR 1 5NIAL HEAUTI <br /> ; . o am 1 i r. PERMITISERVICES <br /> Soil sampling will be performed under the direction of an Aegis <br /> engineer or geologist. Soil samples will be collected as per San <br /> Joaquin County Guidelines. Soils will be collected from the <br /> bott^m of the tang excavation by excavation equipment. Soils will <br /> be cojiecied from the excavator by use of a nand sampler with <br /> brass sampling tubes . No perSsnnel will enter the axcavation. <br /> Tr reduce the possibility of cross-contamination between sanpling <br /> paints, all sampling equipment will be washed in a snap solution <br /> and double-rinsed between each sampling point. <br /> Upon recovery, a portion of the soil sample will be placed into a <br /> glass jar and sealer: for later screening with a photoionization <br /> detector. Another pert.ion of the soil sample will be used for <br /> classification and description. That part of the soil sample <br /> collected in a brass tube will be stored at approximately 4 c for <br /> transport to the laboratory. <br /> n2 Qdi1 cl ysification <br /> As the samples are obtained in the field, they are classified by <br /> the geologist in accordance with the Unified Soil Classification <br /> System (USCS) . Representative portions of the samples are then <br /> returned to the laboratory for further examination and for <br /> verification of the field classification. <br /> Ij s2il Bars la Bora ning Portable Photoionization Detector <br /> Method <br /> After soil sample jars have been brought to ambient temperature, <br /> the head space of the soil sample jars will be screened with a <br /> portable photoionization detector equipped with a 10. 2 eV lamp <br /> calibrated to benzene for direct reading in ppm. The sample jar <br /> lid will be opened and the detector probe immediately placed <br /> within the head space of the jar. The highest observed reading <br /> will, be recorded. <br /> 2 .0 ANALYTICAL PROCEDURES <br /> All soil samples submitted to the laboratory will be analyzed for <br /> BTEX, TPH, and total lead using EPA Methods 8020, 8015 (modified) <br /> and 7421, respectively. Ground water samples submitted to the <br /> laboratory will be analyzed for the same petroleum hydrocarbon <br /> constituents as the soil samples using EPA Methods 524 . 2/8240 , <br /> 8270, 7422, respectively. <br /> Paye: t <br />