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APPENDIX C <br /> SAMPLE COLLECTION AND TRANSPORT <br /> A. Sample Collection <br /> 1. Field Notebook <br /> The field investigator should keep a field notebook <br />' (preferably bound with pages numbered) to record sample <br /> collection procedures, dates, laboratory <br /> identification, sample collection location, and the <br />' name of the sampler. This is important for later <br /> recall or legal challenge. <br /> 2 . Soil Samples <br /> a. Hydrocarbons: Soil samples collected from a <br /> backhoe, the ground or a soil coring device, <br />' should be collected in a thin-walled stainless <br /> steel or brass cylinder at least three inches long <br /> by one inch in diameter that has been prepared by <br /> the laboratory doing the analysis or the project <br />' consultant (cylinders can be made to fit inside <br /> the preferred split-barrel core sampler) . About <br /> one inch of soil should be removed from the <br /> immediate surface area where the sample is to be <br /> taken and the cylinder then pounded into the soil <br /> with a wooden mallet. No headspace should be <br /> present in the cylinder once the sample is <br />' collected. When the sample is collected, each end <br /> of the cylinder should be covered with aluminum <br /> foil and then capped with a polyethylene lid, <br /> taped, and labeled. The sample should then be <br />' immediately placed in an ice chest containing dry <br /> ice and kept cold (4 "C ) for delivery to the <br /> laboratory. Care should be taken throughout to <br />' avoid contamination of both the inside and outside <br /> of the cylinder and its contents (1) . <br /> Sample homogenization should not be performed on <br />' samples intended for volatile and semivolatile <br /> organic analysis since the mechanical action of <br /> mixing exposes a larger surface area of the <br /> contaminated soils and other solids in the samples <br /> to the air, thus .increasing the total amount of <br /> volatilization. <br /> Al2 <br />