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Attachment 3 Historical Soil Analytical Data Former Arco Service Station No. 0595 6100 North Highway 99, Stockton, California ple MTBE Sample Depth Date GRO DRO B T E X MTBE (8260) TBA DIPE ETBE TAME Ethanol 1,2-DCA EDB Lead Name (feet) Sampled (mg/k ) (mg/kg) (mg/kg) (m /kg) (m kg) (m /k ) (ni (mg/k ) (mg/kg) (mg/kg) (mglk ) (m /kg) (m k ) (mg/kg) (m k ) (m /k ) DMW-2,94' 94 6/25/2002 11.0 <5.0 10.0050 10.0050 10.0050 10.0050 - 10.20 12.5 10.10 10.10 10.10 10.10 10.20 - DMW-3,60' 60 6/27/2002 17.0 15,0 <0.0050 10.0050 <0.0050 10.0050 - 10.20 12.5 10.10 10.10 10.10 - 10.10 10.20 DMW-3,79' 79 6/27/2002 <1.0 <5.0 <0.0050 10.0050 <0.0050 <0.0050 - <0.20 <2.5 <0.10 <0.10 10.10 - 10.10 <0.20 DMW-3 96' 96 6/27/2002 <1.D <5.0 10.0050 10.0050 <0.0050 <O.0050 - <0.20 <2.5 <0.10 <0.10 <0.10 - <0.10 <0.20 MW-iR61' 61 11/18/2008 10.50 - 0.0091 -0.0010 <O.0010 <0.0010 - 0.022 10.010 <0.002D <0.0020 <0.o02D 10.10 10.0010 10.0010 - MW-1R 66' 66 11/18/2008 <0.50 - 0.0020 c0.001D <0.0010 <0.0010 - 0.02D 0.012 <0.0020 <0.0020 <0.0020 40.10 <0.0010 <0.0010 - MWAR71' 71 11/18/2008 <0.50 10.0010 <0.0010 <0.0010 <0.0010 - 0.012 <0.010 10.0020 10.0020 <O.D020 10.1 000 <0.0111 <0.0010 MW-2R 60' 60 11/12/2008 10.50 - <0.0010 <0.0010 <0.001D -0. 10 - 0.0160 <0.010 <0.002D <0.0020 <0.0020 10.10 0.002 <0.0010 - MW-2R 65' 65 11/12/2008 10.50 - <0.0010 <0.0010 <O.0010 <0.0010 - D.0059 <0.010 <0.0020 <0.0020 <0.0020 <0.10 0.0027 <0.0010 - MW-2R 70' 70 11/12/2008 10.50 <0.0010 10.0010 10.0010 10.0070 - 0.0082 10.010 10.0020 10.0020 10.0020 10.10 0.0028 <0.0010 MW-3R 65' 65 11/19/2008 40.50 - 10.0070 10.0010 40.0010 10.0010 - 10.0010 10.010 10.0020 10.0020 10.0020 10.10 10.0010 10.0010 MW-3R 70' 70 11/19/2008 <0.50 - -0.0010 10.0010 <0.0010 <0.0010 - <0.0010 <0.010 <0.0020 <0.0020 <0.0020 10.10 <0.0010 10.0010 MW-3R 75' 75 11/19/2008 <0.50 10.0010 <0.0010 <O.DO10 <0.0010 10.0010 10.010 10.0020 10.0020 10.0020 10.10 <O.0010 -0.0010 - MW<R 40' 40 77/13/2008 10.50 - 10.0070 10.0010 10.0010 10.0010 - 10.0010 10.010 10.0020 10.0020 10.0020 10.10 <p,0010 10.0010 MW-4R 70' 70 11/13/2008 <0.50 - <0.0010 <0.0010 <0.0010 10.0010 - 0.016 <0.010 <0.0020 <0.002D -0.0020 <0.10 0.0031 10.0010 MW-4R 75' 75 11/13/2008 <0.50 <0.0010 10.0010 10.0010 <O.D010 0.041 <0.010 <0.0020 <0.0020 -O.DO20 <0.10 0.0025 <0.0010 - Monitoring Wells(MW)continued - MW-6R 1010 4/14/2009 <0.50 - <0.0010 <0.0010 <0.0010 <0.0010 - <D.DD10 <0.010 <0.0020 <0.0020 <0.0020 10.10 <p.0010 <O.Op10 MW-6R 70' 70 4/14/2009 <0.50 <0.0010 <0.0010 10.0010 <0.0010 - 10.0010 10.010 <0.0020 <0.0020 10.0020 10.10 10.0010 <0.0010 - MW-8R 60' 60 11/11/2008 <0.50 - 10.0010 .0.0010 <0.0010 <O.0D70 - <0.0010 <0.010 <0.0020 <0.0020 10.0020 10.10 10.0070 10.0010 - MWAR65' 65 11/11/2008 <0.50 - <0.0010 <0.0010 <0.0010 <0.0010 - <0.0010 <0.010 <0.0020 -0.0020 .0.0020 <0.10 .0.0010 <0.0010 - MW-BR 75' 75 11/11/2008 <0.50 <0.0010 <0.0010 <O.DD10 <D.0010 -0.0010 .0.010 -0.0020 10.0020 10.0020 10.10 10.0010 10.0070 - MW-10R-61 61 1/28/2009 <0.50 - -0.0010 <0.0010 <0.0010 <0.001D - 10.0010 10.010 -0.0020 -0.0020 10.0020 10.10 <0.001a <0.0010 MW-IOR-66 66 1/28/2009 <0.50 <0.0010 <0.0011) <0.0010 <0.0010 - <0.0010 10.010 10.0020 <0.0020 <0.0020 10.10 <0.0010 10.0010 DMW-1R45' 45 11/12/2008 <0.50 - <0.0010 <0.0010 <0.0010 <0.0010 - 10.0010 <0.010 <0.0020 <O.0020 <0.0020 -0.10 <0.0010 10.0010 - DMW-1R 65' 85 11/12/2008 <0.50 - 10.0010 -0.0010 <O.D010 <0.0010 - <0.0010 <0.010 10.0020 <0.0020 <0.002D <0.10 <0.0010 <0.0010 - DMW-1R 75' 75 11/12/2OD8 <0.50 - <0.0010 <0.0010 <0.0010 <D.0010 - 0.018 -0.010 -0.0020 <0.0020 <0.0020 10.10 0.0017 <0.0010 - DMW-7R 1DO' 100 11/12/2OD8 <0.50 -0.0010 <0.0010 <0.0010 <0.0010 0.077 10.010 <0.0020 <0.0020 <0.0020 10.10 0.0023 <0.0010 DMW-2R 60' 60 11/13/2008 <0.50 - <0.0010 <0.0010 <0.0010 <0.0010 - 10.0010 10.010 10.0020 <p.0020 10.0020 10.70 0.0044 10.0010 DMW-2R 65' 65 11/13/2008 <0.50 - <0.0010 <0.0010 <0.0010 <0.0010 - 10.0010 .0.010 10.0020 <0.0020 <0.0020 10.10 0.0067 10.0010 - DMW-2R 70' 70 11/14/2008 <0.50 10.0010 <0.0010 <0.0010 <0.0010 <0.0010 <0.010 <0.0020 <0.0020 <0.0020 <0.10 0.11023 <0.0010 DMW-3R 65' 65 11/17/2008 <0.50 - <0.0010 0.0011 <0.0010 0.0013 - <0.0010 <0.010 <0.0020 <0.0020 <0.0020 <0.10 <0.0010 <0.0010 - DMW-3R 70' 70 11/17/2008 <0.50 - <0.0010 0.0013 <0.0010 0.0018 - -0.0010 <0.010 10.0020 <0.0020 <0.0020 10.10 <0.0010 10.0010 - DMW-3R 75' 75 11/17/2008 <0.50 - 10.0010 0.0011 <0.0010 0.0016 - 10.0010 -0.010 -0.0020 10.0020 <0.0020 10.10 100010 10.0010 - 1 Stockpiled Soils(SP) - SP-i-2 - 12/29/2005 <0.099 - 10.0050 <0.0050 10.0050 <0.0050 - <0.0050 10.020 <0.0050 <0.0050 <0.0050 <0.099 <0.0050 40.0050 <7D SP-3-4 - 12/29/2005 <0.10 - <0.0050 <0.0050 <0.0050 <D.005D - <0.0050 <0.020 40.0050 <0.0050 <0.0050 10.10 <0.0050 10.0050 <10 SP-5-6 - 12/29/2005 <0.10 - <0.0050 <0.0050 <0.0050 <0.0050 - 10.0050 <0.020 10.0050 <0.0050 10.0050 <0.10 <0.0050 10.0050 110 SP-7-8 - 12/29/2DD5 <0.10 - <0.0050 <0.0050 <0.0050 <0.0050 - <0.0050 .0.020 <0.0050 <0.005D <0.0050 <0.10 <0.0050 <0.0050 <10 SP-9.10 - 12/29/2005 <0.10 <0.0050 <0.0050 <O.DO50 <0.0050 - <0.0050 <0.020 <0.0050 <0.0050 10.0050 <0.10 <0.0050 <0.0050 <10 SP-11-12 - 12/29/2005 <0.10 - <0.0050 <0.0050 -0.0050 <0.0050 - <0.0050 -0.020 <0.0050 <0.0050 <0.0050 <0.10 <0.0050 <0.0050 -10 SP-13-14 12/29/2005 210 - <0.050 0.067 0.13 1.9 - <0.025 <5.0 <0.025 <0.025 <0.025 <10 <0.025 <0.025 <10 SP-15-18 - 1IW2006 640 - <1.0 1.5 3.7 29 - <0.50 <100 10.50 <0.50 <0.50 1200 <0.50 <0,50 15 SP-19-22 1/3/2006 620 - <0.25 0.74 3.6 27 - <0.12 <26 <0.12 10.12 <0.12 <60 <0.12 <0.12 <10 SWC-1 11/11/2008 <0.50 <D.0010 <0.0010 <O.DO10 <O.D010 <0.0010 -0.010 <0.0020 <0.0020 <O.DO20 <0.10 <0.0010 <0.0010 6.26 Notes GRO=Gasoline range organics 'Quantification of unknown hydrocarbon(s)in the sample based upon the specified standard DRO=Diesel range organics B=Benzene T=Toluene E=Ethylbenzene X=Xylenes 595 Arco Historical soil.Xts Page 5 of 6