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28 August 2000 lb AGE-NC Project No. 98--0481 Page 6 of 8 3.1.2 . Ground Water Sample Collection I A grab ground water sample was collected from SB-4 using a disposable bailer. The augers were advanced to a depth approximately four feet below the water table. A disposable bailer was lowered through the augers to collect a ground water sample. Sufficient sample was collected from boring SB-4 to fill three 40-m1, EPA-approved VOA vials containing 0.5 mI 18% hydrochloric acid as a sample preservative and one 1-liter bottle without a sample preservative. Ground water sample containers were labeled with probe boring designation, date, time, and samplers initials. IThe preserved samples were logged on a chain-of-custody form, placed in a chilled container and transported to a DHS-certified laboratory; the samples were analyzed for: ITPH-g and TPH-d by EPA Method 8015 Modified; ' BTEX with MTBE by EPA Method 602; and • TBA, DIPE, ETBE, TAME and MTBE by EPA Method 8260 Modified. 3.1.3. Equipment Decontamination Prior to sample collection, soil and ground water sampling equipment was thoroughly rinsed with clean water after washing with a solution of Alconox. Augers were thoroughly cleaned prior to soil Iboring advancement. 3.1.4. Logging Soil sample duplicates were monitored for the presence of organic vapor using an organic vapor ' meter equipped with a photo-ionization detector (PID: Thermo Environmental 580A, 10.0 eV,' calibrated to isobutylene) and were visually described on boring logs in accordance with the Unified- , ' Soil Classification System (USCS). Boring logs are included as Appendix A. ' 4.0. FINDINGS Soil descriptions were utilized to construct the vertical and lateral soil model; laboratory analysis of Isoil and ground water samples were utilized to assess the hydrocarbon-impact on the two media. Advanced GeoEnvironmental,Inc. I -