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1 09 September 1996 AGE-NC Project No 95-0173 iPage 5 of 8 ' utilizing a dedicated, disposable polyethylene bailer and new nylon rope Sufficient sample was collected from each well to fill three 40-aril EPA vials preserved with hydrochloric acid, and two one- liter amber bottles Care was taken to ensure that no air bubbles were present in the VOAs after filling and capping Ground-water sample containers were labeled with the well designation, date, time, and samplers initials ' Following collection of ground water samples, the sample was immediately placed in an ace chest and cooled to 4'C Each sample was logged on a chain-of-custody form, placed in a chilled container and ' transported to a California certified laboratory for analysis of TPH-g and TPH-d, BTE&X, MTBE and total lead in accordance with EPA methods 5030/8015M, 602, 8020, and 200 9, respectively The results of the analysis are contained in Table 4 -Analytical Results Of Gi aurid Water Samples 1 4.0. FINDINGS ' 4 1 SOIL PROFILE Generally, a slightly moist, brown to dark brown, stiff, medium-dense clayey silt/silty clay was encountered from surface grade to depths of approximately 20 feet, although intermittent lenses of fine-grained sand and silty sand were present Pale brown to dark brown, stiff, medium-dense, very ' fine to medium-grained, sandy silt was encountered from depths of approximately 20 to 35 feet, although intermittent lenses of fine-grained sand were encountered Between 35 and 50 feet, the soil type consists of gray to green, very moist to saturated, very fine to fine-grained silty sand Gray to ' green, saturated, very fine to fine-grained sand was encountered from depths of 50 to 60 feet bsg Groundwater was encountered from each boring at a depth of approximately 35 feet bsg Boring logs are included in Appendix A Figure Nos 8 and 9 depict the general lithology beneath the site in cross sectional views 4 2 FIELD EVIDENCE OF HYDROCARBON-RVIPACTED SOIL Generally, petroleum hydrocarbon odors were detected at borings B-1, B-2, and at borings MW-i through 'IMINj-3 from 15 to 60 feet bsg Organic vapors were detected at concentrations as high as 7,000 parts per million (ppm) utilizing a PID in soil sample duplicates Slight petroleum hydrocarbon odors were detected between 30 and 50 feet bsg in boring MW-4 Organic vapors were detected using the PID in soil samples from MW-4 at concentrations up to 75 parts per million (ppm)