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Quik Stop Station No. 039 Stockton, California Tank Closure Report Table 1 - Analytical Results For Soil Samples Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE DIPE ETBE TAME TBA Meth. Ethan. Lead Number Date benzene benzene (Ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (Ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) T -1-N-13' 11/12/98 <1.0 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.010 <0.20 <0.020 <5.0 T -1-S-13' 11/12/98 <1.0 <0.0050 <0.0050 <0.0050 0.020 <0.010 <0.010 <0.010 <0.010 0.21 <2.0 <0.20 5.8 T -2-N-13'/:' 11/12/98 <1.0 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.010 <0.20 <0.020 na T -2-S-13' 11/12/98 <1.0 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 <0.010 <0.20 <0.020 na D-1-3' 11/12/98 440: <0.20 ":0.34 <0.20 6.6 <0.20 <0.20 <0.20 <0.20 <0.50 <10 <1.0 13 D-2-3' 11/12/98 <1.0 0.0082 0.017 <0.0050 0.0089 0.0055 <0.0050 <0.0050 <0.0050 <0.010 <0.20 <0.020 na SP-1-A,B,C,D 11/12/98 60 <0.020 0.044 0.025 0.74 ,: 0.65 na na na na na na 6.5 SP-2-A,B,C,D 11/12/98 63 <0.020 0.069 0.16 1.6 0.14 na na na na na na 6.4 BF-I-A,B,C,D 11/17/98 <1.0 <0.0050 <0.0050 <0.0050 <0.0050 <0.0050 na na na na na na na TPHg = Total Petroleum Hydrocarbons as gasoline MTBE = methyl tertiary butyl -ether by EPA method 8260 DIPE = di -isopropyl ether ETBE = ethyl tertiary butyl ether TAME = tertiary amyl methyl ether TBA = tertiary butyl alcohol ppm = parts per million (mg/Kg) nc = not calculated na = not analyze Sample Sample TPHg TPHd TPHmo Oil &` Benzene Toluene Ethyl- Xylenes MTBE Number Date Grease benzene (Ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (Ppm) MW -SW T1/12/98 1.3 <100 20,000. 14.300 ' <0.0050 1.0 <0.0050 0.018 TPHd = Total Petroleum Hydrocarbons as diesel TPHmo = Total Petroleum Hydrocarbons as motor oil 7039-1 l .tcr HORIZON ENVIRONMENTAL INC. •