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TABLE 4 - Historical Soil Analytical Data - ARCO Service Station Mo. 2130 I 7906 North El Dorado Street, Stockton, CA Sample Total Sampled Solids GIRD DRO B T E X MTBE TBA DIPE ETBE TAME Ethanol 1 ,2-DCA EDB Lead Sample Name Depth (feet) Date Solids (mg/kg) (mg/kg) (mg/kg) (mglkg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mglkg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) ;Underground Storage Tanks (T) T1A 16 00/20/93 - 40000 - 1 .7 120 100 620 - - - - - - - - - TIB 16 08/20/93 - ND - ND ND ND ND - - - - - - - - T2A 16 08/20/93 - 35400 - 24 38 50 330 - - - - - - - - 228 T2B 16 08/20/93 - ND - ND ND ND ND - - - - - - - - 6.7 T3A 15 08/20/93 - 1 .6 - ND 0,0073 ND 0.031 - - - - - - - - 6,4 T313 16 06/20/93 - ND - ND ND ND ND - - - - - - - - 6.4 T4A 16 08/20/93 - 27200 - 2.7 2.9 ND 31 - - - - - - - - - _ - T4B 16 08/20/93 1 .8 0.21 ND ND 0,029 h .ct Line Samples (L) L1 2.5 09/09/93 - 24 - 01089 ND 0,43 2 - - - - - - - - - L2 2.5 09/09/93 - 1,600 - ND 14 32 200 - - - - - - - - - L3 2.5 09/09/93 - 650 - ND 0.96 5.4 41 - - - - - - - L4 2.5 09/09/93 - 6,4 - 0.012 0.0055 O.D63 0,42 - - - - - - - - - L5 2.5 09/09/93 ND ND ND ND ND - - - - - - - Dispenserlsland Boreholes (D I) ` DI-3-4 at 5' 5 11/29/D5 <0.10 <0.0050 <0.0050 <0.0050 <0,0050 <0.0050 <1020 <0.0050 <0,0050 <0.0050 <0.10 <0.0050 <0.0050 <10 "A ISoil Boreholes (B) B1 '15 05/24/91 - 27400 - 1 .0 3.7 21 170 - - - - - - - - - 30 05/24/91 - 690 - 1 .7 12 8.9 60 - - - - - - - - - 45 05/24/91 - 15400 - 13 75 31 170 - - - - - - - - 55 05/24/91 - 520 - 6.4 35 13 66 - - - - - - - - - 6D 05/24/91 - 8.4 - 0.069 0.22 0,075 015 - - - - - - - - - 68 05/24/91 - 190 - 0.069 0.56 1 .2 7.5 - - - - - - - 24 -:Monitoring Wells (CALK) MW-1 (B-2) 41 12/16/91 - <1 .0 - <0.005 <0.005 <0.005 0.039 - - - - - - - - - 46 12/16/91 - <1 .0 - 0.073 <0.005 <0.005 0.0084 - - - - - - - - - 61 12/16/91 5.5 0.41 0.41 0.048 0.28 - - - - - <5.0 MW-2 (B-6) 36 12/16/91 - <1 .0 - <0.005 <0.005 <O.OD5 <0.005 - - - - - - - - - 46 12/15/91 - <1 ,0 - 0.049 <0.005 <0.005 0,03 - - - - - - - - <5.0 61 12/16/91 <1 .0 0,039 <0.005 0.0061 D.023 9W-3 (B-6) 41 12/19/91 - <1 .0 - 0.043 0.029 <0.005 0.058 - - - - - - - - - 61 12/19/91 <1 .0 <0.005 <0.005 <0.005 0.005 NiW-4 (B-9) 36.5 06/13/92 - <1 .0 - 0.0075 <0.005 <1005 <0.005 - - - - - - - - - 51 .5 08/13/92 - <1 .0 - O.D48 0.036 40.005 0.019 - - - - - - - - 61 .5 08/13/92 - <1 .0 - 0.14 0.011 <0.005 0.043 - - - - - - JVNV-5 (B-16) 16.5 00/20/92 - <1 .0 - 0.0064 0,014 <0.005 0.062 36.5 08/20/92 - 0,86 - 0.17 <0.005 <0.005 0,15 - - - - - - - - - 61 .5 08/20/92 98 3.4 5.9 215 11 Nita-6 (B-21) 4D.5 11 /16/92 - <1 .0 - <0,005 <0.005 <0.005 <0.005 - - - - - - - - 55 11/16/92 - <1 .0 - <0,005 <0.005 <0.005 <D,005 - - - - - - - - - j 6D 11/16/92 - <1 .0 <0.005 <D.005 <D.005 <0.005 - - - - - - - - MW-7 (B-22) 35.5 11/17/92 - <1 .0 - <0.005 <0,005 <0.005 <0.005 - - - - - - - - - 60.5 11/17/92 - <1c - <0.005 <0.005 <0.005 <0.005 - - - - - - - - - 65.5 11/17/92 <1 .0 <0.005 <0.005 <0.005 <0.005 - MW-8 (13-23) 56.5 11/04/93 - 41 .0 - 40.005 40.005 <0.005 <0.005 - - - - - - - - - 66.5 11/04/93 <1 .0 <0,005 <0.005 <0.005 <O.005 - -MW-9 (B-24) 56.5 11 /05/93 - <1 .0 - <0.005 44005 <0,005 <0.005 - - - - - - - - - 66.5 11 /05/93 -<1 .0 <0.005 <0.005 <0.005 <0.005 MW-10 (B-25) 11 /13/93 Notsam led due to proximity of MW-9 . MW-11 20.0 07/06/06 - <0.20 1 .6* <0.010 <0.010 <0.010 <0.01D <0.01D <0.040 40.010 <0.010 <0.010 <0.20 <4010 <0.010 - 35.0 07/06/06 <0.2D 1 .4* <0.010 <0.010 <0.010 <0.010 <0.010 <0.040 <0.010 <0.010 <0.010 <0.20 <0.010 <D.010 - l 2130 Historical Soil Table.xls Page 1 of 3 Stantec