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TABLE 1 Historical Soil Analytical Data Former ARCO Service Station No.443 2478 East Oak Street Stockton, California Sample _;.- .,.,. Depth Date DRO GRO Benzene Toluene Ethylbenzene Xylenes MTBE DIPE ETBE TAME TBA 1,2-DCA EDB Ethanol Lead Sam Ie Name leet Sam led m Ik mg/kg m /k m /k m ik m ik m lk m Ik m !k m 'k m !k m Ik m /k m ;k m IV,) Shell Soil Borin SS SB-16 60 11@2/2002 - <1.0 <0.005 <0.005 '0.005 c0.005 <0.5 <0.5 <0.5 <0,5 <0.5 <0.5 <0.5 <100 - 70 11/22/2002 - '1.0 <0.005 <0.005 <0.005 '0.005 <0.5 <0.5 <0.5 '0.5 <0.5 '0.5 <0.5 '100 - 80 11/22/2002 - '1.0 '0.005 '0.805 '0.005 '0.005 4.5 <0.5 '0.5 <0.5 '0.5 <0.5 <0.5 '100 - 90 11/22/2002 - <1.0 4.005 <0.005 <0.D05 '0.005 '0.5 <0.5 '0.5 <0.5 <0.5 '0.5 <0.5 '100 - 100 11122/2002 '1.0 '0.005 '0.005 '0.005 <0.005 <0.5 4.5 <0.5 '0.5 <0.5 '0.5 <0.5 <100 - SB-18 60 11/19/2002 - <1.0 <0.005 '0.005 <0.005 '0.005 <0.5 <0.0010 <0.0050 4.0050 <0.010 <0.0050 '0.0050 '100 70 11/19/2002 - '1.0 '0.005 '0.005 <0.005 '0.005 <0.5 '10 <5.0 '5.0 '25 <5.0 '5.0 <100 - 80 11/19/2002 <1.0 '0.005 <0.005 <0.005 '0.005 4.5 4.50 <0.50 '0.50 <2.5 '0.50 '0.50 <100 - SB-26 10.5 11/3/2005 - '1.0 '0.0050 <0.0050 4.0050 <0.0050 4.0050 <0.0010 <0.0050 '0.0050 4.010 '0.0050 <0.0050 - - 20.5 11/3/2005 - 18,000 <5.0 36 200 1,900 '5.0 <10 '5.0 <5.0 '25 '5.0 <5.0 - - 30.5 11/3/2005 - 62 <0.50 0.91 0.92 4.4 '0.50 '0.50 <0.50 <0.50 '2.5 <0.50 '0.50 - - 40.5 11/3/2005 - 19,000 11 1,100 460 2,200 '10 '21 <10 '10 <52 '10 <10 - - 50.5 11/3/2005 - 3,500 2.9 120 69 320 <2.5 <5.0 '2.5 <2.5 '13 <2.5 <2.5 - - 60.5 11/3/2005 - 5,200 30 220 99 470 '2.5 <5.0 '2.5 <2.5 <13 '2.5 <2.5 - - 70.5 11/3/2005 1,600 5.7 53 26 130 <0.50 0.0 10.50 '0.50 '2.5 <0.50 '0.50 - - SB-27 10.5 11/4/2005 - <1.0 <0.0050 '0.0050 '0.0050 0.0067 <0.0050 <0.010 <0.0050 '0.0050 '0.010 <0.0050 '0.0050 - - 20.5 11/4/2005 - 0.0 '0.0050 <0.0050 <0.0050 <0.0050 <0.0050 '0.010 <0.0050 <0.0050 4.010 '0.0050 <0.0050 - 30.5 11/4/2005 - 0.0 <0.0050 '0.0050 <0.0050 <0.0050 '0.0050 <0.010 '0.0050 <0.0050 4.010 <0.0050 <0.0050 - 40.5 11/412005 - <1.0 4.0050 '0.0050 <0.0050 4.0050 '0.0050 <0.010 '0.0050 '0.0050 <0.010 '0.0050 <0.0050 - - 50.5 11/4/2005 - 0.0 '0.0050 '0.0050 '0.0050 0.0052 '0.0050 <0.010 '0.0050 '0.0050 <0.010 '0.0050 4.0050 - - 60.5 11/4/2005 - '1.0 <0.0050 <0.0050 <0.0050 <0.0050 4.0050 4.010 '0.0050 4.0050 4.010 <0.0050 '0.0050 - - 70.5 11/4/2005 - 0.0 <0.0050 <0.0050 '0.0050 <0.0050 <0.0050 '0.010 '0.0050 4.0050 <0.010 <0.0050 <0.0050 - - Monitorin 11111111h,,..;. . <<. 11. 1 1.. -- MW-1S 6 6/27/2007 - '0.10 <0.005D <0.0050 '0.0050 <0.0050 '0.0050 4.0050 <0.0050 <0.0050 '0.020 <0.0050 21 6/27/2007 - 6,800 <5.0 40 190 1,200 <2.5 <2.5 <2S <2.5 <500 12.5 - - 25 41 6/27/2007 - 3,600 1.5 180 94 390 4.50 <0.50 4.50 <0.50 <100 <0.50 - - 12 61 6/27/2007 - 11,000 47 660 290 1,500 '2.5 '2.5 <2.5 <2.5 <500 <2.5 - - 7.8 65 6/26/2007 3,899 7.0 64 30 140 <0.50 <0.50 <0.50 '0.50 <99 '0.50 - - 12 MW-5 31 12/10/2008 - '0.50 <0.0010 <0.0010 <0.0010 <0.0010 '0.0010 <0.0020 '0.0020 '0.0020 <0.010 <0.0010 '0.0010 <0.10 - 51 12/10/2008 '0.50 <0.0010 <0.0010 4.0010 <0.0010 <0.0010 <0.0020 4.0020 <0.0020 <0.010 '0.0010 '0.0010 <0.10 - Table 1 Soils Page 1 o12