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Appendix C:Field and Sampling Methods decanted into laboratory-provided bottles, labeled, placed in an ice-cooled chest, and submitted to Lancaster under SAIC chain-of-custody protocol to be analyzed for crude-oil constituents. SAMPLING LOCATIONS/SURVEY METHODS Soil borings were geo-spatially located using a global positioning system(GPS)unit. The GPS survey methods were consistent with SAIC FTP No. 175, "Field Measurement of Physical and Topographical Features." EQUIPMENT DECONTAMINATION The decontamination of sampling equipment, which did not directly contact the samples, was performed in accordance with SAIC FTP No. 400, "Equipment Decontamination." Sample collection devices, which directly contacted the samples, were decontaminated in accordance with SAIC FTP No. 405, "Cleaning and Decontaminating Sample Containers and Sampling Equipment." In general, all non-dedicated equipment that came into contact with potentially contaminated soil or groundwater was decontamintated. Decontamination occurred before and after each use of a piece of equipment. For example, the down-hole equipment was cleaned between borings,using a Liquinox®/water solution or steam cleaner to prevent the possibility of cross contamination. The equipment was decontaminated in a predesignated area over plastic sheeting, and the clean equipment was stored in an uncontaminated area. Specific decontamination procedures for non- dedicated sampling equipment vary by sampler type, and are more fully described in SAIC FTP No. 405. Disposable equipment intended for one-time use was not decontaminted but was packaged for appropriate disposal. Reusable sampling equipment not coming into contact with potentially contaminated soil samples,but requiring decontamination, included field test meters; the water-level sounder; and stainless steel hand augers and trowels. Specific decontamination procedures employed for these types of sampling equipment are more fully described in SAIC FTP No. 400. SAMPLE CUSTODY The integrity of environmental samples collected during this investigation was ensured, from collection to final dispostion,by documenting possession in accordance with SAIC FTP No. 625, "Chain-of-Custody." The chain-of-custody record identified the contents of each shipment and maintained the custodial integrity of the samples. A sample was generally considered to be in a person's custody if it was in their physical possession or in their view, locked up, or kept in a secured area that was restricted to authorized personnel. The chain-of-custody record included the following: • Sample identification numbers; • Site name; • Sample date(s); • Numbers and volumes of sample containers; • Required analyses; • Signatures and names of samplers; • Signature of any individual(s)with custody over samples; • Airbill number; and • Note(s) indicating special holding time and/or detection limits. C-2 W" mom ==MWsi%�® from SeWWO to SWUN648