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Table 2.Historical Groundwater Monitoring and Analytical Data <br /> ARCO Station No.4932,16 East Harding Way,Stockton,CA <br /> TOC Product Water Level Concentrations in Pg/L <br /> Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl- Total <br /> Dace Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETRE TAME TBA 1,2-DCA EDB Footnote <br /> EW-4Cont. <br /> 1/6/2011 10.72 - -- -- <50 <0.50 <050 <0.50 <050 12 <300 <0.50 <0.50 <0.50 <10 0.76 <0.50 <br /> 2/25/2013 24.67 0.00 -13.95 - -- _ _ _ <br /> 2/27/2013 -- - - <50 <2.0 <2.0 <2.0 <4.0 500 - <2.0 <2.0 <2.0 <40 2.7 <2.0 <br /> 8/19/2013 25.68 0.00 -14.96 <50 <0.50 <050 <0.50 <1.0 170 <150 <050 <0.50 <0.50 <10 15 <0.50 <br /> 11/26/2013 26.10 0.00 -15.38 <50 <0.50 <0.50 <0.50 <1.0 96 <150 <0.50 <0.50 <0.50 12 1.2 <0.50 <br /> EW-5 <br /> 9/3/2003 NS - - - 5,800 <100 <100 <100 <100 5,900 - -- <br /> 12/3/2003 - - - 440 <5.0 <5.0 <10 <5.0 230 - _- <br /> 1/12/2004 32.52 0.00 - 480 <25 <25 <25 <25 1,300 <5,000 <50 <50 <50 <1,000 <25 <25 <br /> 4/26/2004 31.04 0.00 -- <25,000 <250 <250 <250 <250 8,400 <50,000 <250 <250 <250 10, <250 <250 <br /> 7/14/2004 11.46 32.34 0.00 -20.88 <5,000 <50 <50 <50 <50 2,200 <10,000 <50 <50 <50 <2,000 <50 <50 <br /> 8/4/2004 - - - <5,000 <50 <50 <50 <50 2,700 <10,000 <50 <50 <50 <2,000 <50 <50 <br /> 10/27/2004 34.37 0.00 -22.91 860 <50 <50 <50 87 3,700 <10,OW <100 <100 <100 <2,000 <50 <50 <br /> 1/12/2005 33.64 0.00 -22.18 230 <5.0 <5.0 <5.0 <5.0 390 <1,000 <10 <10 <10 <200 <5.0 <5.0 <br /> 4/13/2005 30.46 0.00 -19.00 <50 <0.50 <050 <0.50 <0.50 58 <100 <0.50 <0.50 <0.50 <20 1.0 <0.50 <br /> 7/11/2005 30.32 0.00 -18.86 <2,500 44 <25 <25 <25 2,200 <5,000 <25 <25 <25 <1,000 <25 <25 <br /> 10/5/2005 31.95 0.00 -20.49 980 N <5.0 <5.0 <5.0 <5.0 830 <1,000 <5.0 <5.0 <5.0 <200 <5.0 <5.0 <br /> 1/13/2006 30.87 0.00 -19.41 <500 <5,0 6.0 <5.0 <5.0 90 <3,000 <5.0 <5.0 <5.0 <200 <5.0 6.0 <br /> 4/12/2006 31.87 0.00 -20.41 <500 <5.0 <5.0 <5.0 <5.0 <5.0 <3,000 <5.0 <5.0 <5.0 <200 <5.0 <5.0 <br /> 7/12/2006 26.94 0.00 -15.48 <50 <0.50 <050 <0.50 <050 24 <300 <0.50 <0.50 <0.50 <20 <050 <0.50 • <br /> 10/19/2006 28.26 0.00 -16.80 190 <2.5 <25 <2.5 <2.5 310 <1,500 <2.5 <2.5 <2.5 <100 <25 <25 <br /> 3/13/2007 27.59 0.00 -16.13 100 <2.5 <25 <2.5 <2.5 210 <1,500 <2.5 <25 <2.5 <100 <2.5 <2.5 <br /> 5/15/2007 27.39 0.00 -15.93 - - _- <br /> 5/16/2007 27.48 0.00 -16.02 <50 <0.50 <0.50 <0.50 <050 24 <300 <0.50 <0.50 <0.50 <20 <0.50 <0.50 <br /> 8/1/2007 27.97 0.00 -16.51 - <br /> 8/2/2007 27.97 0.00 -16.51 <50 <0.50 <0.50 <0.50 <050 12 <300 <0.50 <0.50 <0.50 <20 <050 <0.50 <br /> 11/20/2007 28.80 0.00 -17.34 - - <br /> 11/21/2007 -- - - <50 <0.50 <0.50 <0.50 <0.50 37 <300 <0.50 <0.50 <0.50 <20 0.75 <050 <br /> 1/21/2008 10.79 28.01 0.00 -17.22 - - - <br /> 1/23/2008 - -- - <50 <0.50 <0.50 <0.50 <050 14 <300 <0.50 <0.50 <0.50 <20 058 <0.50 <br /> Page 14 of 38 <br />