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I 1r. • 24 April 2000 ' AGE-NC Project No. 97-0327 Page 2 of 6 borings. Soil samples were collected utilizing a California modified split-spoon sampler loaded with 2-inch by 6-inch brass sleeves. The sampler was driven by dropping a 140-pound weight from a height of 30 inches. The number of blows required to drive each 6-inch length of the sampler(blow ' counts) was recorded on boring logs by an AGE staff geologist. Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape. Each preserved sample sleeve was labeled with soil boring location, depth, time, date and sampler's initials. ' Each preserved 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 for analysis in accordance with: • EPA Method 5030/8015M for total petroleum hydrocarbons quantified as-gasoline and diesel ' (TPH-g and TPH-d, respectively); • EPA Method 8020 for volatile aromatic compounds: benzene, toluene, ethylbenzene and • xylene (BTEX) with methyl-tertiary butyl ether(MTBE); and • EPA Method 8260 Modified for tertiary butanol (TBA), di-isopropyl ether(DIPS), ethyl tert butyl ether(ETBE),tert amyl methyl ether(TAME), and confirmation of MTBE. The results of the soil analyses are contained in Table 1. 1 2.3. EQUIPMENT DECONTAMINATION The hollow stem augers were steam cleaned prior to each bore hole advancement. Sampling tools and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, ' and were thoroughly rinsed with clean tap water prior to each sampling run. At the conclusion of field activities, all rinseate generated from decontaminating the equipment was placed in properly labeled D.O.T.-approved model 17H 55-gallon drums and was stored on-site in an area lacking ' public access. 2:4. . . SOIL BORING LOGS ' During drilling,'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 includedas Appendix A. General lithology Advanced CcoEnvironmcntal,Inc. 1