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i 17 December 1999 1� AGE-NC Project No 96-0235 Page 6 of 11 r f 1 + s' samples Field observation, results of laboratory analysis of soil and ground water samples and a Idiscussion of data collected during field work follows , i F 31 i STRATIGRAPHY - et �< Primarily clay was encountered from surface grade to` approximately 25 feet bsg Sand was encountered from.25 to 40 feet bsg Clay with thin sand intervals was encountered from 40 to nearly 60 feet bsg Sand was present in the 65, 80 and 85-foot samples collected Silt was present in the 70 - foot sample and the top of the 75-foot sample from baring B 10 Clay was encountered in the samples collected from 90, and'95 feet bsg, the greatest depth explored The boring logs are included as Appendix A Stratigraphic cross scctions are'presented-iii Figures 5 and 6 Lines of,cross sections G ° are shown on Figure 4 ' I ' Y 32 ANALYTICAL RESULTS OF SOIL SAMPLES Organic vapor was detected in soil sample duplicates from 7 of the 9 borings advanced at the site iat concentrations as high as 1,871 ppm (BI I at 45 feet bsg) Organic vapor was not detected in soil samples collected from bonngs B 13 or MW9 PID data is included on the boring logs (Appendix A) and is summarized on Table i TPH-g was detected in' 18 of the 34 soil samples analyzed at concentrations as high as 7,000 parts per million (ppm, reported as milligrams per kilogram), TPH-d was detected in 14 of the 34 samples , at concentrations as high as 4 ,100 ppm BTEX compounds were detected at conccntrations as high as 9 1 ppm, 210 ppm, 190 ppm and 1,100 ppm, respectively Petroleum hydrocarbons were not detected iii,11 of the 341soil samples analyzed I a , MTBE and+TAME were detected in the soil'sample collected from a depth of 55 feet bsg in boring B9 at concentrations of 0 013'ppm and 0 024 ppni, respectively TAME was detected in the sample collected from a depth of 65 feet bsg in boring B9 at a concentration of 0 013 ppm Other oxygenates r1�' were not detected in the seven soil samples analyzed by EPA Method 8260 Analytical results of soil samples are summarized on Tables 1 and 2 The laboratory,reports (MAI Sample Nos 23268-23289' y „and"24100-2411 J)'and chain-of-custody,forms are included in Appendix B The approximate extent of impacted soil is illustrated on Figures 4, 5 and 6 1 S' ! Organic vapor was initially detected at a concentration of43pprn in the sample collected from a t depth of 90 feet bsg in boring B10 However, upon cutting away, he outside of the sample, organic ' vapor was no longer detected The detected organic vapor may be fro'mdthe impacted groundwater ' encountered at shallower depths contaminating the sampler during passage through the augers , ` r f Advanced GeoEnvi ron mental,Inc ' 1 ' 1 1