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. 10 August 2004 AGE-NC Project No 96-0232 Page 3 of 10 Soil samples from both the split-spoon sampler and Geoprobe soil sampling assembly were preserved by covering both ends of the second brass sleeve with Teflon sheets, then capping and scaling the ends with tape Each preserved sample sleeve was labeled with soil boring designation, depth, time,-date and sampler's Initials - - - - - Each preserved soil sample was logged on a chain-of-custody form,placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory, selected samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d, and TPH-mo, respectively) by EPA Method 8015M, • Benzene, toluene, ethylbenzene, xylene (BTEX) by EPA Method 8020, • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- isopropyI ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and methyl tert butyl ether(MTBE)by EPA Method 8260B, and • Semi-volatile organic compounds by EPA Method 8270 23 SAMPLE LOGGING During drilling activities, 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 from P-39 through P-43 and MW-19 are included as Appendix B 2 4 GRAB GROUND WATER SAMPLE COLLECTION Selected grab groundwater samples was collected from borings P-39 through P-43 utilizing a hydro- punch technology A Geoprobe water sampling assembly was advanced to the selected depth utilizing hollow steel rods The hollow steel rods were then retracted upward approximately four feet,thereby exposing a PVC screen to ground water A bailer fitting was then placed on the end of 3/a-inch diameter polyethylene tubing, inserted through the rod assembly into the exposed screen, through which water was manually pumped Sufficient sample was collected from borings P-39 through P-43 to fill three 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and one 1-liter amber bottle without sample preservative Ground water . sample containers were labeled with probe boring designation, date, time, and samplers initials Advanced Geo Environmental,Inc