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21 May 2002 <br /> AGE-NC Project No. 02-0930 <br /> Page 2 of 4 <br /> ' During drilling,sample duplicates were monitored"for the presence of organic vapor using an organic <br /> vapor meter equipped with a photo-ionization detector(PID:Thermo Environmental 5 80A, 10.0 eV, <br /> calibrated to isobutylene)and were visually described on boring logs in accordance with the Unified <br /> Soil Classification System (USCS). Boring logs are included as Appendix A. <br /> Following sample collection,probe borings were backfilled to surface grade with Portland cement. <br /> EQUIPMENT DECONTAMINATION <br /> Prior to sample collection,the Geoprobe soil sampling equipment was thoroughly rinsed with clean <br /> ' water after being washed with a solution of Alconox. Geoprobe rods were thoroughly cleaned prior <br /> to soil probe boring advancement. <br /> ANALYTICAL METHODS <br /> S <br /> The soil samples were transported to McCampbell Analytical, Inc. (MAI), a DHS-certified <br /> laboratory, for analysis. Fifteen soil samples were analyzed for total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g), diesel(TPH-d) and motor oil (TPH-mo) in accordance with EPA <br /> Method 8015 Modified.In addition,soil sample B5-15 was analyzed for volatile organic compounds <br /> (VOCs)and semi-volatile organic compounds(S VOCs)in accordance with EPA Methods 8260 and <br /> 8270, respectively. <br /> FINDINGS <br /> Soil descriptions were utilized to construct the site geological model; laboratory analysis of soil <br /> samples was utilized to assess the petroleum hydrocarbon-impact on the soil. <br /> SOIL PROFILE <br /> Generally,moderate yellowish brown, moderate brown and gray,dry to damp, clayey silt, silty clay <br /> and lean clay were encountered from surface grade to approximately 20 feet bsg. Silty to poorly <br /> graded fine sand was encountered in probe boring B-3 between 10 and 20 feet bsg; poorly graded <br /> sand was encountered at 10 feet bsg in probe boring B-1 and silty sand/sandy silt was encountered <br /> at 15 feet bsg in probe boring B-5. Fill material was detected at 5 feet bsg in probe boring B-2. <br /> Boring logs are included in Appendix A. <br /> Advanced GeoEnvironmental, Inc. <br />