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7 August 1995 <br /> AGE-NC-95-0146 <br /> Page 2 of 3 <br /> bore sampler). The sampler was loaded with four clean 6-inch brass sleeves. After retrieval of the <br /> sampler, soil in the second brass sleeve was preserved by covering each end with aluminum sheets, <br /> capping and sealing with tape. The samples were then placed in a chilled container pending <br /> transportation to a State-certified laboratory. Sample duplicates were placed in a plastic bag and <br /> screened for the presence of organic vapors using a photo-ionization detector (PID: Thermo <br /> Environmental 580A, 10.0 eV, calibrated to isobutylene). <br /> Prior to each sampling run, the sampling equipment was cleaned in an Alconox solution and rinsed <br /> twice with water. After sample collection, the probings were backfilled with Portland cement. <br /> The sail samples (samples Bl-5 and B1-10) were transported under chain-of-custody to Alpha <br /> Analytical Laboratories (AAL) in Ukiah, California. Sample B1-5 was analyzed for TPH-d and <br /> BTE&X in accordance with EPA methods 8015 modified for diesel fuel and 8020, respectively. <br /> Sample B1-10 was placed on "hold" at AAL pending results of the analysis of sample B1-5. <br /> 4.0. FINDINGS <br /> Soil encountered at the site was compacted silty-fine sand. No organic vapors were measured with <br /> the PID. TPH-d and BTE&X were not detected in the soil sample analyzed. The laboratory report <br /> and chain-of-custody are included in Appendix A. <br /> 5.0. CONCLUSIONS AND RECOMMENDATIONS <br /> Soil at the site is highly compacted, creating a virtually impermeable surface. Since no hydrocarbons <br /> were detected in the soil sample at a depth of 5-feet, it is unlikely that deeper migration of any surface <br /> contaminants has occurred. <br /> Based upon the results of the Geoprobe investigation and the existing soil conditions at the site, it is <br /> unlikely that the surface contamination present in the area of the rebound piles poses a significant <br /> threat to ground water or to vertical migration in the soil beyond the top few inches. However, we <br /> recommend that the top 4 to 6 inches of soil in the rebound area be removed and treated or disposed <br /> in an appropriate manner. <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br />