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16 March 2000 <br /> AGE-NC Project No. 99-0683 <br /> Page 4 of 5 <br /> 3.1.3. Equipment Decontamination <br /> Prior to sample collection. Geoprobe soil and ground water sampling equipment was thoroughly <br /> rinsed with clean water atter washing with a solution of Alconox. Geoprobe rods were thoroughly <br /> cleaned prior to soil probe boring advancement. <br /> 3.1.4. Logging <br /> During drilling activities. sample duplicates were monitored for the presence of organic vapor using <br /> an organic vapor meter equipped with a photo-ionization detector (PID: Thermo Environmental <br /> 580A, 10.0 eV, calibrated to isobutylene) and were visually described on boring logs in accordance <br /> with the Unified Soil Classification System (USCS). Boring logs are included as Appendix A. <br /> 4.0. FINDINGS <br /> Soil descriptions were utilized to construct the site geological model, laboratory analysis of soil <br /> samples were utilized to assess the hydrocarbon-impact on soil and ground water. <br /> 4.1 SOIL PROFILE <br /> A black. moist clay was encountered at 5 feet bsg. Generally, a light brown to orange, dry, silty fine <br /> _ sand was encountered from 10 feet bsg to depths of approximately 30 feet bsg, with the exception <br /> of a fine sandy silt that was encountered at 20 feet bsg. Boring logs are included in Appendix A. <br /> 4.2 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> Petroleum hydrocarbon odor and organic vapor were not observed or detected in any of the soil <br /> samples collected from B I through B3 <br /> 4.3 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Seven soil samples were submitted to DHS-certified laboratories (MeCampbell Analytical Inc.) for <br /> analysis as noted above. TPH-d and MTBE were not detected in any of the soil samples collected <br /> from borings BI through 133. <br /> BTEX compounds were detected in one soil sample collected from B3. Toluene and xylenes were <br /> Advanced GeoEn ironmental,1nc. <br />