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will be collected at 5-foot intervals for laboratory analysis. The <br /> results of this investigation will be included in the Problem <br /> Assessment Report to be submitted before October 1, 1993 . <br /> Steps in the installation are detailed below: <br /> 1) Drill one vadose zone well using truck-mounted, continuous- <br /> flight, 8-inch diameter hollow-stem augers and complete <br /> according to the well design shown in Figure 3 . <br /> 2) Obtain discrete soil samples at five-foot intervals, using a <br /> split-tube sampler loaded with three pre-cleaned brass tubes. <br /> 3) Decontaminate sampling equipment in a tri-sodium phosphate <br /> solution (TSP) and rinse twice with water prior to each <br /> sampling run. <br /> 4) Describe auger returns and soil samples in accordance with the <br /> Unified Soil Classification System on boring log. <br /> 5) Visually examine soil samples, and use portable photo- <br /> ionization detector to screen samples for evidence of volatile <br /> organic hydrocarbons . <br /> 6) Preserve samples in the lower brass tube by covering both ends <br /> with aluminum foil, capping, and sealing with tape. <br /> 7) Label and log soil samples on a chain-of-custody form. <br /> 8) Store samples under ice. <br /> 9) Store soil cuttings on plastic pending analytical results. <br /> 10) Steam-clean auger flights after drilling. <br /> 11) Transmit sail samples to a state-certified laboratory, and <br /> analyze for purgeable petroleum hydrocarbons (TPH-G) in <br /> accordance with EPA method 8015 and for aromatic hydrocarbons <br /> (BTE&X) in accordance with EPA method 8020 . <br /> 2 <br />