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o� mor ' n tile <br /> 3) Drill a minimum of (1) soil boring CR----,, ) <br /> 30 feet utilizing a truck-mounte <br /> rig. GeoAudit is assuming that the <br /> migrated in a vertical direction fi <br /> tank pit. Therefore, to assess t <br /> contamination, the boring will be <br /> the former tank pit. The estimated ; <br /> on Figure 2. If contamination is en <br /> borings may be installed upon a <br /> PHS/EHD. <br /> 4) Obtain discrete soil samples at fi _..-..L VdJLs using a <br /> split-spoon sampler loaded with three pre-cleaned brass tubes. <br /> 5) Preserve soil samples in the lead brass tube by covering both <br /> ends with aluminum sheets, capping and sealing with tape. <br /> 6) Label and log soil samples on a chain of custody form. <br /> 7) Store the samples under ice and transport the samples in a <br /> chilled container to a State certified laboratory for <br /> analysis. <br /> 8) Analyze selected soil samples (approximately three) for total <br /> petroleum hydrocarbons (TPH as gasoline and diesel) , volatile <br /> aromatics (BTE&X) and total lead in accordance with EPA <br /> methods 8015m, 8020 and 7421, respectively. <br /> 9) Decontaminate sampling equipment in a tri-sodium phosphate <br /> solution (TSP) and rinse twice with water prior to each <br /> sampling run. <br /> 10) Monitor auger returns and soil sample duplicates for the <br /> presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> 11) Log auger returns in accordance with the Unified Soil <br /> Classification System. <br /> 12) Place auger returns in 55 gallon DOT drums and store on-site <br /> pending analytical results. <br /> 13) Backfill the borings using concrete-bentonite slurry in the <br /> entire depth of the borings. <br /> 14) Prepare a report summarizing the results of the above <br /> investigation. The report will be submitted to the PHS/EHD. <br /> 2 <br />