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' 01 March 2004 <br /> AGE-NC Project No 99-0645 <br />' Page 2 of 11 <br /> The borings were advanced with a BK-81 or Mobile drill ng equipped with 8 25-inch diameter <br />' hollow-stem augers The drill ng and three-man crew were supplied by Woodward Drilling of Rio <br /> Vista Auger returns generated by drilling were stored on-site in Department of Transportation <br />' (DOT)-approved 55-gallon drums <br />' 2 1 1 Soil Sample Collection <br /> Discrete soil samples were collected using a 140-pound hammer to advance the split spoon sampler <br />' The number of blows required to advance the sampler over each 6-inch increment of the 18-Inch <br /> sampling interval was recorded on the boring log Sampling equipment was washed in an Alconox <br /> solution and rinsed with water prior to each sampling run to minimize cross-contamination <br />' Soil samples were collected at five foot intervals, beginning mostly at 10 feet bsg, or where native <br /> soil was encountered below back fill Otherwise, samples were taken at sampling intervals which <br />' were not previously sampled, generally deeper soil samples, as to not duplicate sampling Soil <br /> samples were preserved by covering both ends of the second brass sleeve with Teflon sheets,capping <br /> and sealing with tape Each preserved sample sleeve was labeled with soil boring location, depth, <br />' time, date and sampler's initials and was stored in a chilled container under ice <br /> Soil encountered in the borings was visually classified on a boring log by an AGE geologist in <br />' accordance with the Unified Soil Classification System (USCS) Additionally, soil samples were <br /> selectively field-screened for the presence of volatile organic compounds using an organic vapor <br /> meter(OVM) equipped with a photo-ionization detector(PID Thermo Environmental 580b, 10 0 <br /> eV, calibrated to isobutylene), the concentration readings were recorded on the boring log Boring <br /> logs are included in Appendix B <br /> 2 1 2 Laboratory Analysis of Soil Samples <br /> Selected soil samples were transported under chain-of-custody procedures to Cal Tech <br /> Environmental Laboratories,a CaliformaDepartment ofHealth Services(DHS)-certified laboratory <br />' and analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br />' 0 Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiarybutyl ether(MTBE) <br /> in accordance with EPA Method 8021, and <br />' 40 The oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) by EPA <br /> Method 8260 Modified <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />