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TABLE 1 SOIL SAMPLE ANALYTICAL RESULTS PG&E THORNTON GAS DEHYDRATOR STATION SAN JOAQUIN COUNTY, CALIFORNIA Borehole Depth TOG TPH-MO TPH-D TPH-K TPH-G Benzene Toluene Ethylbenzene Xylenes 1.D. (in feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) B-1 1.0 870 N.D. N.D. N.D. 12 N.D. 0.03 0.031 0.21 B-2 2.0 N.D. N.D. N.D. N.D. N.D. 0.011 0.0087 N.D. 0.0056 B-2 8.0 N.D. N.D. 10 N.D. N.D. N.D. N.D. N.D. N.D. B-3 4.5 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-3 9.0 390 N.D. 680 N.D. 49 N.D.' N.D.` N.D.' N.D.' B-4 3.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-4 9.0 N.D. N.D. 120 N.D. 11 N.D. N.D. 0.016 0.095 B-5 3.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D- B-5 6.0 1200 N.D. 420 N.D. 6.7 N.D. N.D. N.D. 0.067 B-6 3.0 N.D. N.D. N.D. N.D. N.D. 0.0055 0.0059 N.D. N.D. B-6 6.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-7 2.0 4300 N.D. 7700 N.D. 270 N.D.' 0.8 0.31 3.6 B-7 8.0 89 N.D. 1900 N.D. 43 N.D.' N.D.' N.D.' N.D.' B-8 2.0 1900 N.D. 4200 N.D. 170 N.D.' 0.39 N.D.' 2 B-8 8.0 140 N.D. 30 N.D. 32 N.D.' N.D.' N.D.' N.D.' B-9 2.0 4000 N.D. 4200 N.D. 140 N.D.' N.D.' N.D.' 0.94 B-9 8.0 52 N.D. 8.6 N.D. 42 N.D.' N.D.' N.D.' N.D.' B-10 2.0 1300 N.D. 4300 N.D. 1.6 N.D. N.D. 0.0093 0.043 B-10 5.0 4400 N.D. 9300 N.D. 89 N.D.' N.D.` N.D.' 0.67 B-10 7.0 1100 N.D. 1800 N.D. 3.7 N.D. N.D. N.D. 0.017 B-11 2.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-11 8.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-12 2.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-12 7.5 N.D. N.D. N.D. N.D. N.D. N.D. 0.0082 N.D. N.D. B-13 3.0 N.D. N.D. N.D. N.D. N.D. 0.0094 0.007 N.D. N.D. B-13 9.0 N.D. N.D. 340 N.D. 62 N.D.' N.D.` N.D.' N.D.' B-14 3.0 1700 N.D. 210 N.D. 26 0.016 0.01 0.035 0.26 B-14 9.0 N.D. N.D. 20 N.D. 0.0049 N.D. N.D. 0.03 0.3 B-15 2.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. B-15 8.0 N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. N.D. Detection Limits 50 1.0 1.0 10 1.0 0.005 0.005 0.005 0.005 NOTES: 1. Samples collected on December 2,3,4 and 10,1992 and analyzed by Chromalab(San Ramon). 2. ND=Less than stated method detection limit. ND'=less than 0.2 mg/kg due to dilutions needed. 3. TOG=Total Oil and Grease(Standard method 5520 E&F). 4. TPH-MO=Total Petroleum Hydrocarbons as Motor Oil(EPA method 3550/8015). 5. TPH-D=Total Petroleum Hydrocarbons as Diesel(EPA method 3550/8015). 6. TPH-K=Total Petroleum Hydrocarbons as Kerosene(EPA method 3550/8015). 7, TPH-G=Total Petroleum Hydrocarbons as Gasoline(EPA method 5030/8015). 8. Benzene,Toluene,Ethylbenzene and Xylenes analyzed by EPA method 8020. -3