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Table 2.Historical Groundwater Monitoring and Analytical Data <br /> Former ARCO Station No.443,2478 East Oak Street,Stockson,CA <br /> TOC Product Water Level Concentrations inµg/L <br /> Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl- Total <br /> Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2 DCA EDB Footnote <br /> M W-6 Cont <br /> 6/17/2013 NS 42.68 0.00 -- 84 <0.50 10.50 <0.50 <3.0 <0.50 -- 10.50 <0.50 10.50 <10 <0.50 <0.50 <br /> MW-7 1 <br /> 5/19/2009 22.95 50.43 0.00 -27.48 - - 1' -- -- -- -- '- _ -- <br /> 5/21/2009 <br /> _ _ -- -- • <br /> 5/21/2009 - <50 <0.50 0.84 <0.50 <0.50 <0.50 -- <0.50 <0.50 10.50 <10 <0.50 <0.50 <br /> 11/16/2009 52.80 0.00 1 -29.85 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- - - <0.50 <0.50 <br /> 5/20/2010 49.90 0.00 -26.95 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.10 <0.50 <10 <0.50 <0.50 <br /> 11/11/2010 49.940 0.00 -26.45 50 <0.50 <0.50 <0.50 <0.50 - -- -- 0.50 <0.50 <br /> 6/6/2011 45.87 0.00 -22.92 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- 10.50 10.50 <br /> 12/8/2011 44.60 0.00 -21.65 <50 <0.50 <0.50 <0.50 <0.50 - -- -- -- -- -- 10.50 10.50 <br /> 6/4/2012 42.85 0.00 -19.9D 150 10.50 10.50 10.50 10.50 10.50 1300 10.50 <0.50 <0.50 <10 <0.50 <0.50 <br /> 12/17/2012 43.45 0.00 -20.50 <50 <0.50 <0.50 <0.50 <1.0 -- -- -- -- -- -- <0.50 <0.50 <br /> 6/v/zo13 43.35 0.00 1� -2o.ao <so <Dso <oso <oso 11.0 <oso - <oso <oso <oso no <oso <oso <br /> MW-8 <br /> 3/11/2009 NS 50.75 0.00 -- -- -- -- - _ -- -- -- -- -- -- - <br /> 4/17/2009 23.05 51.82 0.00 -28.77 <50 <50 0.74 <0.50 <0.50 <0.50 1 -- 10.50 <0.50 <0.50 <10 1.4 10.50 <br /> 5/19/2009 50.65 0.00 -27.60 76 0.97 6.7 2.1 IS <D.SD -- <0.50 <0.50 <0.50 <10 2.1 <0.50 <br /> 11/16/2009 53.01 0.00 -29.96 <50 3.6 1.3 0.92 4.9 -- -- -- -- -- -- 3.3 <0.50 <br /> 5/20/2010 49.90 0.00 -26.85 <5' C-85 <br /> 1.1 2.0 8.8 <0.50 1 650 <0.50 <0.50 <0.50 <10 5.1 10.50 • <br /> 11/11/2010 49.27 0.00 -26.22 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- 4.5 10.50 <br /> 6/6/2011 45.90 0.00 -22.85 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- - 4.2 <0.50 <br /> 12/8/2011 44.60 0.00 -21.55 <50 <0.50 10.50 <0.50 <0.50 -- -- -- -- -- -- 3.2 <0.50 <br /> 6/4/2012 42.82 0.00 -19.77 <50 0.57 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <10 1.8 <D.50 <br /> 12/17/2012 43.30 0.00 -20.25 <50 <0.50 <0.50 10.50 <1.0 - -- -- -- -- -- 3.9 10.50 <br /> 6/17/2013 43.52 0.00 -20.47 <50 <0.50 <0.50 <0.50 <1.0 <0.50 - 10.50 <0.50 <0.50 <10 5.0 <0.50 <br /> Page 5 of 6 <br />