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29 September 2003 <br /> AGE-NC Project No 99-0654 <br /> Page 3 of 5 <br />' 2 5 EQUIPMENT DECONTAMINATION <br /> All probing rods used were cleaned prior to advancement in each probe boring location. The <br /> sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination <br /> 2 6 BOREHOLE ABANDONMENT <br /> At the conclusion of soil boring activities, the bonngs were permanently sealed to prevent vertical <br /> migration of contaminants Under EBD oversight, the borehole was backfilled with cement slurry <br /> from the total depth to surface grade <br /> 3.0. FINDINGS <br /> Soil descriptions and ground water elevation and flow direction were determined from field data <br /> liePetroleum hydrocarbon impacts to soil and ground water was inferred from laboratory analysis of <br /> the soil and ground water samples <br /> 3 1 SOIL DESCRIPTIONS <br /> I The soil encountered in all four borings at discrete depths between 5 and 30 feet bsg consisted <br /> predominantly of yellow brown and orange brown, dry to moist, clayey to sandy silt, with the <br /> exception of an apparently laterally discontinuous, blue-gray, fine- to medium-grained clayey to <br /> poorly-graded sand at approximately 25 feet bsg in borings B-1, B-2 and B-4 A blue-gray, clayey <br /> to poorly-graded fine sand was encountered from 35 feet bsg to 45 feet bsg, ground water was <br /> encountered in the blue-gray sand at approximately 40 to 45 feet bsg Soil boring logs are included <br />' in Appendix B <br />' 32 ANALYTICAL RESULTS OF SOIL SAMPLES <br />' TPH-g,MTBE, and BTEX compounds were detected at all four boring locations(Table 1) TPH-g <br /> was detected in soil samples at maximum concentrations of 21,000 milligrams per kilogram(mg/kg) <br /> in boring B1 at 35 feet bsg MTBE was detected in soil samples at maximum concentrations of <br />' 5 6 mg/kg (B4-35') BTEX compounds were detected at maximum concentrations of 27 mg/kg, <br /> 600 mg/kg, 270 mg/kg, and 1,420 mg/kg of benzene, toluene, ethylbenzene, and xylenes, <br /> respectively in boring B1-35' <br />' Advanced GeoEaysranmental,Inc- <br />' <br />