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APPENDIX C <br />SAHPLE 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 projectconsultant (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 />contract laboratory or consultant) with Teflon seal and <br />screw cap should be used, and maintained at 40C until <br />analysis. <br />.m <br />