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i <br /> Table 2 <br /> Historical Soil Sample Analytical Results <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca,California <br /> Sample Ethyl MtBE MtBE Total <br /> Sample Date Depth Benzene Toluene Benzene Xylenes TPHg 8020 8260 DIPE EtBE TAME TBA 1,2-DC EDB Lead Notes <br /> I.D. Sampled (ft bgs) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) I (mg/kg) (mg/kg) I (mg/kg) (mg/kg) (mg/kg) <br /> SP-2 11/29/06 10 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 - <0.0050 <0.0050 0.0050 < .0050 0.0050 < 0050 - - <br /> 20 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 -- <0.0050 0.0050 0.005 <0 005 <0.0050 <0. 05 - -- <br /> 30 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 -- 0.0061 < .005 < .00 0 <0. 0 0 0.0072 <0. 0 -- - <br /> 40 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 -- <0.0050 <0. 0 0 <0 0 50 <0. 50 <0.0050 <0. 050 - -- <br /> SP-3 11/28/06 10 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 -- <0.0050 <0 50 < . 050 J.(050 <0.0050to. <br /> . 050 - - <br /> 20 <0.0050 <0.0050 0.055 <0.0050 2.9 - 0.024 < .0 50 0.0 50 . 050 0.0060 050 - - a <br /> 30 0.0062 <0.0050 0.42 0.22 160 - 0.13 #0.0 50 <0.0 II5 <0. 050 0.053 <0.0 50 -- -- <br /> 40 <0.0050 <0.0050 <0.0050 <0.0050 <1.0 - <0.0050 <0.0 50 <0.0060 <0.060 <0.005 <0.00 -- -- <br /> Stockpiled Soil Samples <br /> SP-1 09/19/96 - <0.005 <0.005 <0.005 <0.005 4.0 <0.050 -- -- - - -- - -- <10 <br /> SP-2 09/19/96 - <0.005 <0.005 <0.005 <0.005 3.8 <0.050 - -- -- - - - - <10 <br /> SP-3 09/19/96 -- <0.05 <0.05 <0.05 2.3 120 <0.50 -- - - - -- -- - <10 <br /> SP-4 09/19/96 - 0.14 0.17 0.63 13 530 <0.50 - - - - - - -- <10 <br /> SP-5 09/19/96 - <0.05 <0.05 <0.05 0.48 41 <0.50 - - - - - - - <10 <br /> SP-6 09/19/96 - <0.005 <0.005 <0.005 <0.005 <1.0 <0.050 - -- - - - - - <10 <br /> SP-7 09/19/96 - <0.005 <0.005 <0.005 <0.005 3.1 <0.050 - - - -- - - -- <10 <br /> SP-8 09/19/96 - <0.005 <0.005 <0.005 <0.005 5.5 <0.050 - -- - - - - - <10 <br /> SP-9(ABCD) 09/20/96 -- <0.050 7.7 8.6 57 550 <0.50 - -- - -- -- - -- <10 <br /> C1(1234) 09/20/96 - <0.005 <0.005 <0.005 <0.005 <1.0 <0.050 -- - - - -- - - <10 <br /> SP(ABCD) 11/29/06 - <0.0050 <0.0050 <0.0050 <0.0050 <1.0 <0.0050 - - - -- - - - 3.95 <br /> Exolanation: Notes: <br /> ft bgs=Feet below ground surface a=Tert-Butanol results may be biased slightly high. A fraction of MtBE(up to 5%)converts to Tert-Butanol during the analysis of soil <br /> mg/kg=milligrams per kilogram or parts-per-million samples. Kiff considers this conversion effect to be mathematically significant in samples that contain MtBElrert-Butanol in ratios <br /> <=Not detected above laboratory reporting limit of over 3:1. <br /> --=Not applicable <br /> (A,B,C,D)=Four-point composite sample <br /> TPHg=Total petroleum hydrocarbons-as-gasoline <br /> MtBE=Methyl-tert-butyl ether <br /> DIPE=Diisopropyl ether <br /> EtBE=Ethyl-tert-butyl ether <br /> TAME=Tert-amyl-methyl ether <br /> TBA=Tert-butanol <br /> 1,2-DCA=1,2-Dichloroethane <br /> EDB=1,2-Dibromoethane <br /> I:\7-Eleven\7-11 Stores\19976\Tables\19976 Vapor Risk Assessment Tables.xls Pages 4 of 4 <br />