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12 October 2000 <br /> AGE-NC Project No 99-0637 <br /> rPage 4 of 7 <br /> • Volatile aromatic compounds - benzene, toluene, ethyl-benzene, and total xylenes (BTEX) <br /> and MTBE by EPA Method 8020 <br /> 3 12 Ground Water Sample Collection <br />' Grab ground water samples were collected from the probe borings using a temporary PVC screen <br /> The probe rods were advanced to a depth approximately four feet below the water table The hollow <br /> I steel rods were then pulled out, and a screened casing was inserted into the saturated zone Ground <br /> water was allowed to enter the casing, and samples were retrieved using a modified PVC tubing <br /> bailer Sufficient sample was collected from each of the borings to fill four 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and one 1-liter amber <br /> bottle without the sample preservative Ground water sample containers were labeled with probe <br /> boring designation, date, time, and samplers initials <br /> The preserved samples were logged on a chain-of-custody form, placed in a chilled container and <br /> • transported to a DHS-certified laboratory, selected samples were analyzed for <br /> • TPH-g and TPH-d by EPA Method GCFID 5030A/8015Modified, <br /> • Volatile organic compounds by EPA Method 8260B <br /> • Fuel oxygenated compounds -Tertiary butanol (TBA), di-isopropyl ether (RIPE), ethyl tert <br /> I butyl ether (ETBE), tert amyl methyl ether (TAME), and MTBE by EPA Method 8260 <br /> Modified <br /> 3 13 Equipment Decontamination <br /> Prior to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly <br /> rinsed with clean water after washing with a solution of Alconox Geoprobe rods were thoroughly <br /> cleaned prior to soil probe boring advancement <br /> 314 Logging <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 580A, 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 /> Advanced GeoEnvi ron mental,Inc <br /> I <br />