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_ `rr .r 10 February 1998 AGE-NC Project No. 95-0144 Page 3 of 5 3.2. ANALYTICAL RESULTS OF SOIL AND WATER SAMPLES Organic vapor was detected in all soil samples collected from probing GP35 at concentrations ranging from 2 to 428 parts per million(ppm). Organic vapor was detected in GP36 only at a depth of 30 feet bsg with a concentration of 125 ppm. Organic vapor was detected in probing GP37 between 20 and 60 feet bsg at concentrations as high as 240 ppm. TPH-g and TPH-d were detected in soil samples from probing GP35 at depths of 20 and 25 feet bsg at concentrations as high as 16,000 parts per million (ppm, reported as milligrams per kilogram). Only ethylbenzene and xylenes were detected in sample GP35-40 at concentrations of 0.007 ppm ` and 0.022 ppm,respectively. TPH-g and TPH-d were detected in sample GP36-30 at concentrations of 9.6 ppm and 44 ppm, respectively. Petroleum hydrocarbons were not detected in soil samples from probing GP36 at depths of 20 or 35 feet bsg. TPH-g and TPH-d were detected in sample GP37- 35 at concentrations of 890 ppm and 870 ppm,respectively and in sample GP37-50 at concentrations of 76 ppm and 33 ppm,respectively. TPH-g was detected in sample GP37-60 at a concentration of 2.7 ppm. Benzene was detected in three of the eleven soil samples analyzed at concentrations as high as 4.9 ppm. MTBE was not detected in soil samples analyzed from the site. v TPH-g and TPH-d were detected in the water sample collected from a depth of 20 feet bsg in GP35 at concentrations of 51,000 parts per billion (ppb, reported as micrograms per liter) and 1,300,000 ppb, respectively and in the water sample collected from a depth of 45 feet bsg in GP35 at concentrations of 640 ppb and 4,700 ppb,respectively.TPH-g and TPH-d were detected in the water sample collected from probing GP37 at concentrations of 1,600 ppb and 950 ppb, respectively. BTE&X were detected at concentrations ranging from 1.0 ppb (benzene, GP35 at 45 feet)to 3,400 (toluene, GP35 at 20 feet). MTBE was not detected in water samples collected. Lower concentrations of BTE&X were detected in all soil and water samples analyzed using EPA ` Method 8260. The laboratory report notes that this discrepancy is presumably due to the less certain compound identification/resolution inherent in EPA Method 8020 or due to sample inhomogeneity. _ Tertiary butanol was detected in the water sample collected from probing GP37 at a concentration of 15 ppb. Oxygenating compounds were not detected in the remaining water or soil samples analyzed from the site. Ten additional constituents were detected at the site by EPA Method 8260. Analytical results are summarized on Tables 1 and 2. The laboratory report (MAI sample Nos. 83788-83801) and chain-of-custody forms are included in Appendix B. 4.0. DISCUSSION AND CONCLUSIONS Based upon data collected from the site, AGE concludes the following: .4dvanced GeoEnvironmenlel,Inc.