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Appendix C:Field and Sampling Methods <br /> 1 <br /> In general,all non-dedicated equipment that came into contact with potentially contaminated soil <br /> was decontamintated. Decontamination occurred before and after each use of a piece of <br /> equipment. For example, the down-hole equipment was cleaned between borings,using a <br /> Liquinox/water solution to prevent the possibility of cross contamination. The equipment was <br /> decontaminated in a predesignated area on plastic sheeting, and the clean equipment was stored <br /> in an uncontaminated area. Specific decontamination procedures for non-dedicated sampling <br /> equipment vary by sampler type, and are more fully described in SAIC FTP No. 405. <br /> Disposable equipment intended for one-time use was not decontaminted but was packaged for <br /> appropriate disposal. r <br /> Reusable sampling equipment not coming into contact with potentially contaminated soil <br /> samples,but requiring decontamination, included samplers, stainless steel hand augers, and <br /> trowels. Specific decontamination procedures employed for these types of sampling equipment <br /> are more fully described in SAIC FTP No. 400. <br /> C.5 SAMPLE CUSTODY ' <br /> The integrity of environmental samples collected during this investigation was ensured, from <br /> collection to final dispostion, by documenting possession, in accordance with SAIC FTP No. <br /> 625,"Chain-of-Custody." The chain-of-custody record identified the contents of each shipment <br /> and maintained the custodial integrity of the samples. Generally,a sample was considered to be <br /> in a person's custody if it was in their physical possession or in their view, locked up, or kept in a ' <br /> secured area that was restricted to authorized personnel. The chain-of-custody record included <br /> the following: <br /> • Sample identification numbers; ' <br /> • Site name; <br /> • Sample date(s); <br /> • Numbers and volumes of sample containers; <br /> • Required analyses; <br /> • Signatures and names of samplers; <br /> • Signature of any individual(s)with custody over samples: <br /> • Airbill number; and <br /> • Note(s) indicating special holding time and/or detection limits. <br /> Every transfer of custody was noted and signed for on the record, a copy of which was kept by <br /> an individual who signed. The original records accompanied the sample shipment with a <br /> separate record for each cooler. A copy was made for the SAIC master files. , <br /> C-2 ' <br /> SAIC <br />