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Table 2.Historical Groundwater Monitoring and Analytical Data Former ARCO Station No.443,2478 East Oak Street,Stockson,CA TOC Product Water Level Concentrations in Ng/L Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl- Total Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAMETBA 1,2 DCA EDB Footnote MW-2S Cont. 12/17/2012 22.51 43.00 0.00 -20.49 140 0.58 0.70 <0.50 <1.0 -- -- -- - -- -- 4.8 <0.50 6/17/2013 42.89 0.00 -20.38 490 2.0 <0.50 2.1 <1.0 <0.50 -- <0.5D <0.50 <050 38 1.6 <0.50 MW-3S • 7/30/2007 23.42 46.64 0.00 -23.22 1,200 130 9.7 <5.0 46 <5.0 -- 6.0 <5.0 <5.0 <200 630 <5.0 < <2 620 <5.0 < <5.0 <5.0 5.0 00. 9/17/2007 47.79 0.00 -24.37 830 N 79 14 5.4 38 5.0 12/13/200748.26 0.00 -24.84 700 N 47 <5.0 7.0 26 <5.0 <3,000 <5.0 <5.0 <5.0 <200 620 <5.0 3/20/2008 47.05 0.00 -23.63 780 35 2.3 2.6 19 <0.50 -- <0.50 <0.50 <0.50 110 510 <0.50 6/13/2008 47.34 0.00 -23.92 930 52 <10 14 27 <10 -- <10 <10 <10 Q00 600 <10 9/11/2008 49.75 0.00 -26.33 310 <10 <10 <10 <10 <10 -- <10 <10 <10 <200 520 <10 2/17./200850.51 0.00 -27.09 270 <10 <10 <10 <10 <10 <10 <10 <10 <20o Oso <10 3/11/2009 50.77 .0.00 -27.35 420 <10 <10 <10 <10 <10`- -- <10 <10 <10 <200 510 <10 5/19/2009 50.82 0.00 -27.40 570 QO <10 <10 <10 <10 -- <10 I <10 <10 <200 590 <10 .11/16/2009 53.21 0.00 -29.79 650 <5.0 <5.0 <5.0 <5.0 -- -- -- 200 <5.0 5/20/2010 50.25 0.00 -26.83 310 N 2.8 Q.5 4.0 16 Q.5 <1,500 <2.5 <2.5 <2.5 280 1 150 <2.5 11/11/2010 49.90 0.00 -26.48 360 N 3.7 <2.0 <2.0 <2.0 -- - - -- -- - 180 <2.0 6/6/2011 46.30 0.00 -22.88 380 N <2.5 <2.5 12.5 <2.5 - -- -- - - -- 160 <2.5 12/8/2011 45.05 0.00 -21.63 250 <2.5 <2.5 <2.5 <2.5 -- - - -- -- - 190 <2.5 6/4/2012 42.35 0.00 -18.93 170 N <2.5 <2.5 <2.5 <2.5 <2.5 <1,500 <2.5 <2.5 <2.5 70 110 <2.5 . 12/17/2012 43.90 0.00 -20.48 130 1.1 L0 <0.50 Q.0 -- -- - -- -- - 160 <0.50 6/17/2013 43.79 0.00 -20.37 190 1.3 <0.50 <0.50 <1.0 <0.50 -- <0.50 <0.50 <0.50 77 170 <D.50 MW-45 7/30/2007 22.96 46.15 0.00 1 -23.19 200 <0.50 0.64 <0.50 1.3 <0.50 - <0.50 <0.50 <0.50 <20 7.8 <0.50 9/17/2007 47.33 0.00 -24.37 200 2.1 <0.50 <0.50 <0.50 <0.50 -- <0.50 <0.50 <0.50 <20 4.9 <0.50 12/13/2007 47.79 0.00 -24.83 240 <0.50 1.3 <0.50 2.8 <0.50 <300 <0.50 <0.50 <0.50 <20 6.2 <0.50 3/20/2008 46.72 0.00 -23.76 350 <0.50 <0.50 1 <0.50 <0.50 <0.50 -- <0.50 <0.50 <0.50 <10 22 <0.50 6/13/2008 46.89 0.00 -23.93 390 <0.50 <0.50 <0.50 <0.50 <0.50 - <0.50 <0.50 <0.50 <10 28 <0.50 9/11/2008 49.30 0.00 -26.34 300 <0.50 <0.50 <0.50 0.61 <0.50 -- <0.50 <0.50 <0.50 <10 18 <0.50 12/12/2008 50.06 0.00 -27.10 460 <0.50 <0.50 <0.50 <0.50 <0.50 - <0.50 <0.50 <0.50 <10 25 <0.50 3/11/2009 50.36 0.00 -27.40 420 <0.50 <0.50 <0.50 <0.50 <0.50 - <0.50 <0.50 <D.50 <10 34 <0.50 Page 3 of 6