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APPENDIX C <br /> SAMPLE COLLECTION, TRANSPORT, AND LABORATORY ANALYSES <br /> A. Sample Collection <br /> 1. Field Notebook <br /> The field investigator should keep a field notebook (preferably <br /> bound with pages numbered) to record sample collection proce- <br /> dures, dates, laboratory identification, sample collection <br /> location, and the name of the sampler. This is important for <br /> later recall or legal challenge. <br /> 2. Soil Samples <br /> a. Hydrocarbons: Soil samples collected from a backhoe, the <br /> ground or a soil coring device, should be collected in a <br /> thin-walled stainless steel or brass cylinder at least three <br /> inches long by one inch in diameter that has been prepared <br /> by the laboratory doing the analysis or the project <br /> consultant (cylinders can be made to fit inside the <br /> preferred split-barrel core sampler) . About one inch of <br /> soil should be removed from the immediate surface area where <br /> the sample is to be taken and the cylinder then pounded <br /> into the soil with a wooden mallet. No headspace should be <br /> present in the cylinder once the sample is collected. When <br /> the sample is collected, each end of the cylinder should be <br /> covered with aluminum foil and then capped with a <br /> polyethylene lid, taped, and labeled. The sample should <br /> then be immediately placed in an ice chest containing dry <br /> ice and kept frozen for delivery to the laboratory. Care <br /> should be taken throughout to avoid contamination of both <br /> the inside and outside of the cylinder and its contents (1) . <br /> Samples should be kept frozen at the laboratory until they <br /> are analyzed. Holding time should not exceed 14 days from <br /> the time of collection. Frozen soil cores should be removed <br /> from the cylinders by spot heating the cylinder and immedi- <br /> ately extruding the sample (or a portion of it) . A portion <br /> of the frozen sample should be removed and prepared for <br /> analysis according to approved EPA methods. <br /> In situations where the above procedure is inappropriate, <br /> i.e. semi-solid samples, glass vials (properly prepared by <br /> 0 contract laboratory or consultant) with Teflon seal and <br /> screw cap should be used, and maintained at 40C until <br /> analysis. <br /> -60- <br />