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Table 2.Historical Groundwater Monitoring and Analytical Data <br /> ARCO Station No.4932,16 East Harding Way,Stockton,CA <br /> TDC Product Water Level Concentrations in Rg/L <br /> Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl-TT Tota <br /> Date Monitored (feet( (feet) (feet( (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2-DCA EDB Footnote <br /> MW-4 Cont. <br /> 2/25/2013 10.88 24.54 0.00 -13.66 - - - -- - - - '- - - - - <br /> 3/1/2013 - - - 170 2.4 1.2 0.93 <1.0 3.3 - -- - -- -- 2.2 - <br /> 8/19/2013 1 25.45 0.00 -14.57 100 <0.50 <0.50 <0.50 <1.0 2.6 <150 1.0 <0.50 <0.50 47 2.6 <0.50 <br /> MW-5 <br /> 7/20/2001 11.78 27.77 0.00 -15.99 <50 <0.50 <0.50 <050 <0.50 <2.0 - <2.0 <2.0 <2.0 <200 3.8 <2.0 • <br /> 10/22/2001 29.72 0.00 -17.94 <50 <0.50 <050 <0.50 <0.50 <2.0 - <2.0 <2.0 <2.0 <200 25 <2.0 <br /> 1/15/2002 29.07 0.00 -17.29 <50 <0.50 1.8 <0.50 1.2 1.7 - <050 <0.50 <0.50 6.0 32 <050 <br /> 4/11/2002 28.29 0.00 -16.51 <50 <0.50 <0.50 <0.50 <050 3.2 - <0.50 <0.50 <0.50 40 27 <050 <br /> 7/12/2002 29.29 0.00 -17.51 <50 <0.50 0.62 <1350 <0.50 12 - <0.50 <0.50 <0.50 <5.0 - - <br /> 11/20/2002 31.89 0.00 -20.11 <50 <0.50 <0.50 <0.50 <0.50 31 - <0.50 <0.50 <0.50 <20 45 <0.50 <br /> 1/30/2003 31.20 0.00 -19.42 <50 <0.50 <0.50 <0.50 <050 14 <40 <0.50 <0.50 <0.50 <20 7.6 <0.50 <br /> 4/28/2003 30.46 0.00 -18.68 <50 <0.50 <0.50 <0.50 0.61 3.9 <100 <050 <0.50 <0.50 <20 10 <050 <br /> 7/29/2003 31.83 0.00 -20.05 <50,000 1,300 3,800 1,800 5,900 600 <100,000 600 600 600 <20,000 600 <500 <br /> 10/8/2003 33.34 0.00 -21.56 <50 <0.50 1.2 <0.50 1.3 21 <100 <0.50 <0.50 <0.50 <20 15 <050 <br /> 1/12/2004 32.94 0.00 -21.16 60 <0.50 <0.50 <0.50 <0.50 21 <100 <1.0 <1.0 <1.0 <20 12 <050 <br /> 4/26/2004 31.58 0.00 -19.80 6,000 60 110 60 86 60 <10,000 60 60 60 <2,000 60 60 <br /> 7/13/2004 32.70 0.00 -20.92 60 <0.50 <0.50 <0.50 0.72 50 <100 <0.50 <0.50 <0.50 <20 15 <0.50 <br /> 10/26/2004 34.76 0.00 -22.98 <100 <1.0 <1.0 <1.0 <1.0 74 <200 <1.0 <1.0 <1.0 <40 15 <1.0 <br /> 1/13/2005 34.05 0.00 -22.27 390 <5.0 6.0 6.0 6.0 510 <1,000 <10 <10 <10 210 34 6.0 <br /> 4/13/2005 31.23 0.00 -19.45 85 <0.50 <0.50 <050 <050 72 <100 <0.50 <0.50 <050 <20 16 IC50 • <br /> 7/11/2005 30.76 0.00 -18.98 <50 <0.50 <0.50 <050 <0.50 14 <100 <0.50 <0.50 <0.50 <20 7.9 <0.50 <br /> 10/5/2005 32.22 0.00 -20.44 69 N <0.50 1.4 <050 1.5 42 <100 <050 <0.50 <0.50 <20 8.2 <0.50 <br /> 1/13/2006 31.26 0.00 -19.48 <250 <25 <2.5 <2.5 2.9 160 <1,500 <2.5 <25 <25 <100 17 <25 <br /> 4/12/2006 29.15 0.00 -17.37 230 <0.50 <0.50 <0.50 <0.50 - <300 <0.50 <0.50 <0.50 <20 33 <050 <br /> 7/11/2006 27.43 0.00 -15.65 190 <2.5 <2.5 <2.5 <2.5 220 <1,500 <2.5 <2.5 <2.5 <100 26 <2.5 <br /> 10/18/2006 28.63 0.00 -16.85 <250 <2.5 <2.5 <2.5 <25 140 <1,500 <2.5 <2.5 <2.5 <100 12 <2.5 <br /> 3/12/2007 27.95 0.00 -16.17 230 <2.5 <2.5 <2.5 <2.5 260 <1,500 <2.5 <2.5 <2.5 <100 22 <25 <br /> 5/15/2007 27.73 0.00 -15.95 - - - - - - - -- - - - - - <br /> 5/16/2007 27.75 0.00 -15.97 280 N <2.5 <25 <2.5 <25 300 <1,500 <2.5 <2.5 <2.5 <100 22 <2.5 <br /> 8/1/2007 28.27 0.00 -16.49 - - - -- - - - -- - - - -- - <br /> Page 25 of 38 <br />