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Table 2.Historical Groundwater Monitoring and Analytical Data ARCO Station No.4932,16 East Harding Way,Stockton,CA TOC Product Water Level Concentrations in Pg/L Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl- Total Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPS ETBE TAME TBA 1,2-DCA EDB Footnote MW-2 Cont. 10/22/2001 13.11 30.45 0.00 -17.34 1,500 11 8.9 170 10 1,600 - <20 <20 <20 <2,000 <20 <20 1/15/2002 29.90 0.00 -16.79 2,100 18 6.0 350 34 1,200 - <10 <10 <10 <100 <10 <10 4/11/2002 29.07 0.00 -15.96 1,700 24 G5.0 270 13 590 -- <10 <10 <10 <100 <10 <10 7/12/2002 30.05 0.00 -16.94 1,200 10 <10 150 <10 720 < -- 30 <10 <10 <100 11/20/2002 32.54 0.00 -19.43 1,000 N 9.1 2.9 27 <25 10 <10 <10 <q00 <1 1,000 - c 10 <10 - 1/30/2003 _ -- 4/28/2003 - _ _ _ _ - - - - INA 7/29/2003 31.98 0.00 -18.87 990 9.6 <5.0 60 5.1 560 <1,000 <5.0 <5.0 6.0 <200 8.3 <5.0 INA 10/17/2003 33.15 0.00 -20.04 760 <2.5 20 10 51 850 <2,500 <25 <25 <25 <500 <12 <12 1/12/2004 33.16 0.00 -20.05 290 <5.0 <5.0 <5.0 <5.0 430 <1,000 <10 <10 <10 <200 100 6.0 4/26/2004 31.62 0.00 -18.51 220 <0.50 <0.50 0.81 5.9 220 <100 <0.50 <0.50 0.80 100 7.1 <0.50 7/14/2004 32.87 0.00 -19.76 <500 <5.0 <5.0 <5.0 <5.0 300 <1,000 <5.0 <5.0 <5.0 380 7.6 <5.0 10/27/2004 34.82 0.00 -21.71 <1,000 <10 <10 <10 <10 400 <2,000 <10 <10 <10 <400 24 <10 1/12/2005 31.54 0.00 -18.43 220 <0.50 <0.50 <0.50 <050 260 _ 1/13/2005 _ _ _ 34.23 0.00 -21.12 370 <10 <10 <10 <10 460 <2,000 <20 <20 <20 <400 26 <10 4/13/2005 31.83 0.00 -18.72 57 <O.50 <0.50 <050 <O50 44 <100 <0.50 <0.50 <0.50 <20 0.80 <0.50 7/11/2005 30.94 0.00 -17.83 120 <0.50 <050 <0.50 <050 91 <100 <050 <0.50 <0.50 <20 3.3 <050 10/5/2005 32.31 0.00 -19.20 63 N <0.50 <0.50 <0.50 <0.50 50 <100 <0.50 <0.50 <0.50 <20 1.5 <050 c 4/12/2006 29.41 0.00 -16.30 <500 <5.0 <5.0 <5.0 <5.0 390 <3,000 <5.0 6.0 <5.0 <200 14 6.0 7/11/2006 27.63 0.00 -14.52 <50 <0.50 <050 <0.50 <O.50 21 <300 <0.50 <0.50 <0.50 <20 0.64 <050 10/19/2006 28.89 0.00 -15.78 <50 <0.50 <0.50 <0.50 <0.50 32 <300 IC50 <0.50 <0.50 <20 0.65 <0.50 3/13/2007 28.18 0.00 -15.07 <50 <0.50 <0.50 <0.50 <0.50 23 <300 <0.50 <0.50 <0.50 <20 0.61 <050 5/15/2007 27.98 0.00 -14.87 - _ 5/17/2007 27.98 0.00 -14.87 <50 <0.50 <050 <0.50 <050 13 <300 <0.50 <0.50 <0.50 <20 <050 <0.50 8/1/2007 28.52 0.00 -15.41 - - 8/3/2007 28.52 0.00 -15.41 <50 <0.50 <0.50 <0.50 <O.50 7.6 <300 <0.50 <0.50 <0.50 <20 <050 <050 11/20/2007 29.40 0.00 -16.29 <50 <0.50 <O50 <0.50 <050 29 <300 <0.50 <0.50 <0.50 <20 1.1 <0.50 1/21/2008 12.01 28.70 0.00 -16.69 -- _ - 1/23/2008 - - 53 <0.50 <0.50 <0.50 c0.50 71 <300 <050 <0.50 <0.50 44 3.8 <0.50 4/7/2008 27.61 0.00 -15.60 - - -_ -- Page 20 of 38