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Attachment 3 Historical Soil Analytical Data Former Arco Service Station No. 0595 6100 North Highway 99, Stockton, California Sample MTBE Sample Depth Date GRO DRO B T E X MTBE (6260) TBA DIPE ETBE TAME Ethanol 1,2-DCA EDB Lead Name (feet) Sampled (mg/kg) (mglkg) (mg/kg) (m ) (m Ik ) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mglkg) 13.5 10/28/2010 410' - <O.DOIO <0.0010 <0.0010 10.0010 - 0.0018 - - - - - <O.OD10 - - 16 10/28/2010 10,000 - <1.0 <10 70 950 - <1.0 - - - - - 11.0 - - 20 10/28/2DIO 6,600 - 12.0 14 88 680 - 12.0 - - - - - <2.0 - - 25 1028/2010 13' - 0.0031 0.0046 0.072 0.33 - 0.019 - - - - - <0.0010 - - 40 10128/2010 2.2` - 10.10 <0.1D 10.10 0.40 - 0.76 - - - - - <0.10 - - Soil Boreholes(B and PSB) B-1 @ 5' 5 6/1/2000 <1.00 - -0.00500 <0.00500 <0.00500 <0.00500 <0.0500 - - - - - - - ' B-1 @ 15' 15 6/1/2000 <1.DO - <0.00500 <0.00500 <0.00500 <0.00500 <0.0500 - B-1 @ 30' 30 6/12000 <1.00 - <0.00500 <0.00500 <0.00500 <0.005DO -0,0500 - B-1 0 40' 40 6/12000 <1.00 <0.00500 <0.00500 <0.00500 <0.00500 10,0500 - - B-2 @ 5- 5 6/52000 <1.00 - 10.00500 <0.00500 <0.00500 <0.00500 -0.0500 - - - - - - - - B-2 @ 15' 15 6/52000 <1.00 - <0.00500 <0.00500 <0.00500 <0.00500 <0.0500 - B-2 @ 30' 30 6/5/2000 <1.00 - <0.00500 <0.00500 <0.00500 <0.00500 <0.0500 - B-2 A 40' 40 6/52000 <1.00 0.00864 <0.00500 <0.00500 <0.00500 <0.0500 - B-3 @ 5' 5 6/5/2000 <1.00 - <0.00500 .0.00500 <0.00500 <0.00500 <0.0500 - - - - - - - - B-3 @ 15' 15 6/5/2000 <1.00 - 10.00500 <0.00500 <0.00500 <0.00500 '0.0500 - - - - - - - - - Soil Isorelioles- an continued B-3 @ 25' 25 6/5/2000 <1.00 - 10.00500 <O.OD500 <0.00500 <0.00500 <0.0500 - - - - - - - - - B-3 Ca,40' 40 6/5/2000 1.86 0.0645 <0.00500 0.191 0.296 '0.0500 - - - - PSB-1,50' S0 7/17/2001 <1.0 - <0.0050 <0.0050 <0.0050 <0.0050 - <0.20 <2.5 10.10 <0.10 10.10 <25 <0.10 10.20 - PSB-1,60' 60 7/17/2001 11.0 - <0.0050 <O.OD50 -0.0050 <D.0050 - 10.20 <2.5 <0.10 <0.10 <0.10 <25 <0.10 <0.20 - PSB-1,70' 70 7/17/2001 <1.0 - <0.0050 <0.0050 <0.0050 <0.0050 - -0.20 <2.5 <0.10 <0.10 <0.10 <25 <0.10 -0.2D - PSB-1,80' 80 7/17/2001 <1.0 - <0.0050 <0.0050 <0.0050 <0.0050 - <0.20 <2.5 <0.10 <0.10 <0.10 <25 <D.10 <0.20 - PSB-1,90' 90 7/172001 11.0 - <0.0050 10.0050 <0.0050 <0.0050 - 10.20 <2.5 <0.10 <0.10 <0.10 <25 <0.10 <0.20 - PSB-1,98' 98 7/172001 <1.0 10.0050 10.0050 <0.0050 <0.0050 <D.20 <2.5 10,10 <0.10 <0.10 <25 <0.10 <0.20 - PSB-2,10' 10 7/192001 11.0 - <0.0050 <0.0050 10.0050 <0.0050 - 10.20 <2.5 <0.10 <0.10 <0.10 <25 <0.10 10.20 - PSB-2,22' 22 7/192001 <1.0 - <0.0050 <0.005D <0.0050 <0.0050 - 10.20 <2.5 <0.10 <0.10 10.10 <25 <0.10 <D.20 - PSB-2,30' 30 7/192001 <1.0 - <0.0050 10.0050 <O.m50 <0.0050 - <0.20 <2.5 <0.10 <0.10 10.10 <25 <0.10 <0.20 - PSB-2,40' 40 7/192001 <1.0 - <0.0050 <0.0050 <O.D050 <0.0050 - <0.20 <2.5 10.10 <0.10 10.10 <25 <0.10 <0.20 - PSB-2,50' 50 7/192001 <1.0 - <0.0050 <0.0050 <O.DO50 <0.DO50 - <0,20 <2.5 10.10 <0.10 <0.10 125 <0.10 <0.20 - PSB-2.54' 54 7/192001 <1.0 - 10.0050 <0.0050 <0.0050 <D.0050 - <0.2D <2.5 <0.10 <0.10 10.10 <25 <0.10 <0.20 - PSB-2.64' 64 7/19/2001 11.0 - <0.0050 <0.0050 <0.005D <D.0050 - <0.20 <2.5 <0.10 <0.10 <0.10 <25 <0.10 10.20 - PSB-2,70' 70 7/19/2001 11.0 - <0.0050 <O.OD50 <0.005D -D.0050 - 10.20 <2.5 <D.10 <0.10 <0.10 <25 <0.10 <0.20 - PSB-2,88' 88 7/19/2001 11.0 - <0.0050 <0.0050 <0.0050 <0.0050 - <0.20 <2.5 <0.10 10.10 10.10 <25 <0.10 10.20 - PSB-2,98' 98 7/19/2001 11.0 - <0.0050 <0.0050 10.0050 <0.0050 - <D.20 <2.5 <0.10 <0.10 10.10 125 <OA0 <0.20 - MonRorin Wells(MW) MW-1@5' 5 6/1/2000 <1.00 - <0.00500 <0.00500 -0.00500 -O.Oo5DD <D.0500 - - - - - - - - - MW-1 @ 15' 15 6/1/2000 <1.00 - <0.00500 <0.00500 <0.00500 -0.00500 <0.0500 - - - - - - - MW-1 @ 30' 30 6/1/2000 -1.00 - <O.DD500 <0.00500 <0.00500 <0.00500 <0.0500 - - - - - - - - MW-1@45' 45 6/12000 <1.00 - <O.DD500 <0.00500 <0.00500 <0.00500 <0.0500 - - - - - - - - - MW-i@60' 60 6/12000 <1.00 - 10.00500 <0.00500 <0.00500 <0.005DO 10.0500 <0.100 <10.0 <0.100 <0.100 <OADO - <0.100 <0.100 - MW-i @ 65' 65 6/1/2000 <i.DO - 10.00500 -0.00500 <O.OD500 <0.005DO 10.0500 <0.100 <10.0 <D.100 <0.100 <0.100 - <0.100 <0.100 - MW-1 Q 75' 75 6/12000 <1.00 10.00500 10.00500 <O.OD500 <0.00500 <0.0500 <0.100 <10.D <D.100 <0.100 <0.100 - -0.100 <0.100 MW-2 @ 5' 5 6/22000 <1.00 - 10.00500 <0.00500 <0.00500 <0.005DO 0.298 - - - - - - - MW-2 @ 15' 15 6/22000 <1.00 - 10.00500 <0.00500 <0.00500 <0.00500 10,0500 - - MW-2 @ 30' 30 6/22000 <1.00 - 10.00500 <0.00500 <0.00500 <0.00500 <0.0500 - - - - - - - MW-2 @ 45' 45 6/2/2000 <1.00 - 0.0631 <0.00500 <0.00500 10.00500 <0.0500 - - - - - - - - MW-2 @ 55' 55 6/2/2000 <1.00 - 10.00500 <0.00500 <0.00500 <0.00500 <0.0500 <0.100 <10.0 <0.100 10.100 <0.100 - 10.100 <0.100 - MW-2 @ 60' 60 62/2000 11.00 - <0.00500 10.00500 <0.00500 <0.00500 <0.0500 <0.100 110.0 <0.100 <0.100 <0.100 - <0.100 -0.100 - MW-2 65' 65 6/2/2000 <1.00 <0.00500 10.00500 <D.00500 <0.00500 <0.0500 <0.100 <10.0 <0.100 <0.100 10.100 - <0.100 <0.100 - MW-3 5' 5 6/5/2000 <1.00 -0.00500 <0.00500 <0.00500 <0.00500 <0.0500 595 Arm Historical soil.xls Page 3 of 6