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1 <br /> 12 October 1999 <br /> • AGE-NC Project No 98-0497 <br /> ' Page 4 of 7 <br /> ' Tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl ether (ETBE) and tert <br /> amyl methyl ether(TAME), and MTBE by EPA Method 8260 Modified <br /> 3 12 Equipment Decontamination <br /> Prior to sample collection, Geoprobe soil sampling equipment were thoroughly rinsed with clean <br /> water after washing with a solution of Alconox Geoprobe rods were thoroughly cleaned prior to soil <br /> ' probe boring advancement <br /> ' 313 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 /> General lithology beneath the site is depicted in cross sectional view on Figui e 3 <br /> 4 0. FINDINGS <br />' Soil descriptions were utilized to construct the cross section presented in Figure 3 Laboratory <br /> analysis of seven soil samples detected TPH-g, TPH-d and BTEX compounds in five samples, <br /> MTBE was detected in three soil samples, no other fuel oxygenated compounds were detected in any <br />' soil samples <br />' 41 SOIL PROFILE <br />' GeneraIly, a dark brown, moist, fine sandy, clayey silt was encountered from 5 feet bsg to depths <br /> of approximately 10 feet bsg Between 10 feet bsg and 35 feet bsg, a gray/brown, damp, silty fine <br /> sand was encountered Between 35 feet bsg and 40 feet bsg, a brown, damp silty fine sand was <br />' encountered At depths in excess of 40 feet bsg, a brown, damp to moist, -fine sandy silt was <br /> encountered - —�- <br />' Saturated soil was not encountered during drilling activities Boring logs are included in Appendix <br /> A, general lithology beneath the site is depicted in cross sectional view on Figure 3 <br /> Advanced GeoEmironmental,Inc <br />