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I29 April 2004 • AGE-NC Project No 98-0511 Page 2 of 7 2 12 Soil Sample Collection Discrete soil samples were collected at 5-foot intervals, beginning at 5 feet bsg, to total depth (approximately 35 feet bsg) using a Geoprobe push-driven 2-inch diameter soil sampler fitted with four six-inch long brass sleeves 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 and was stored in a chilled container under ice I Soil samples retrieved from the borings were visually classified on a boring log by an AGE geologist in accordance with the Unified Soil Classification System (USCS), the soil boring log is provided in Appendix B Additionally, the soil samples were field-screened for the presence of volatile Iorganic compounds using an organic vapor meter(OVM)equipped with a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV,calibrated to isobutylene), the concentration readings were recorded on the boring log 2 1 3 Grab Ground Water Collection A grab ground water sample was collected from probe boring P-1 at first encountered ground water I utilizing a Geoprobe water sampling assembly fitted with a pre-cleaned one-inch diameter 0 01-inch slotted temporary well screen To collect the sample, the Geoprobe water sampling assembly was advanced to approximately 10 feet below first encountered ground water The hollow rods of the sampling assembly were retracted approximately 10 feet exposing the temporary well screen The ground water sample was extracted by lowering a Teflon hose equipped with a ball-valve through the hollow center of the push rods into the screen section The sample was collected in three EPA- approved 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative The collected ground water samples were labeled with the boring designation, date,time, and sampler's initials and placed in a chilled container under ice I 2 1 4 Laboratory Analysis of Soil and Grab Ground Water Samples The grab ground water sample and selected soil samples were transported under chain-of-custody procedures to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified laboratory, and analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified, and • IAdvanced GeoEnvironmental,Inc