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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- Tatal <br /> Date Monitored (feet) (feet) (feet) (feet) TPNg Benzene Toluene Benzene %ylenes MTBE Etharwl DIPE ETRE TAME TBA 1,2-DCA EDB Footnote <br /> EW-5 Cont <br /> 4/7/2008 10.79 26.91 0.00 -16.12 - - -- '" -- - - <br /> 4/8/2008 - _ - <50 <0.50 <050 <050 <050 5.1 <300 <0.50 <0.50 <0.50 <10 <050 <0.50 <br /> 7/21/2008 28.24 0.00 -17.45 - - - -- - - -- -- - - - - <br /> 8/22/2008 - -- - <50 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <10 <050 <050 <br /> 10/20/2008 29.73 0.00 -18.94 - - - -- -- - -- <br /> 10/21/2008 - - - <50 <0.50 <050 <050 <0.50 72 <300 <0.50 <0.50 <0.50 22 1.7 <0.50 <br /> 1/19/2009 30.00 0.00 -19.21 - - - -- - - - -- - - - -- - <br /> 1/20/2009 - - - <50 <0.50 <0.50 <0.50 <0.50 16 <300 <050 <0.50 <0.50 <10 <050 <050 <br /> 4/20/2009 29.27 0.00 -18.48 - - -- -- -- - - -- - - - - - <br /> 4/21/2009 - _ - <50 <0.50 <050 <050 <050 0.71 <300 <D50 <0.50 <0.50 <10 <0.50 <0.50 <br /> 7/20/2009 30.35 0.00 -19.56 <50 <0.50 <050 <0.50 <0.50 2.9 -- -- - - - 052 - <br /> 1/7/2010 31.02 0.00 -20.23 <50 <1.0 <1.0 <1.0 <1.0 43 - -- - - - <1.0 - <br /> 7/19/2010 28.50 0.00 -17.71 <50 <1.0 <1.0 <1.0 <1.0 50 - - - - - <1.0 - <br /> 1/5/2011 28.54 0.00 -17.75 - - - - - - <br /> 1/6/2011 -- - -- <50 <0.50 <150 <0.50 <0.50 2.4 - -- - - - 0.78 - <br /> 8/2/2011 26.33 0.00 -15.54 <50 <0.50 <0.50 <050 <0.50 13 - -- - - - <D50 - <br /> 2/1/2012 25.88 0.00 -15.09 <.50 <0.50 <0.50 <0.50 <0.50 34 - -- - - - <0.50 - <br /> 8/2/2012 25.65 0.00 -14.86 <50 <0.50 <0.50 <0.50 <1.0 <0.50 - -- - - - <050 - <br /> 2/25/2013 24.78 0.00 -13.99 - - - -- - - - <br /> 2/27/2013 - - - <50 <0.50 <050 <0.50 <1.0 0.62 - -- - - - <050 - <br /> 8/19/2013 25.73 0.00 -14.94 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <150 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <br /> EW-6 <br /> 11/20/2002 NS 31.07 0.00 - 28,000 390 1,500 1,200 6,200 280 - <5.0 <5.0 G5.0 <200 13 <5.0 <br /> 1/30/2003 29.73 0.00 - 26,000 1,800 2,500 1,500 6,200 600 <8,000 <100 <100 <100 <4,BW <100 <100 <br /> 4/28/2003 29.20 0.00 - - - -- -- - - - -- - -- - -- - INA <br /> 7/29/2003 - -- - 4,300 220 57 17 87 1,000 <2,000 <10 <10 <10 <400 <10 <10 NP <br /> 10/8/2003 32.32 0.00 - - - - -- - - - -- - - - - - VOL <br /> 1/12/2004 - -- - - - - -- - - - -- - - - -- - VOL <br /> 4/26/2004 29.95 0.00 - <2,500 63 <25 <25 <25 250 <5,000 <25 <25 <25 <5,000 <25 <25 <br /> 7/13/2004 32.78 0.00 - 6,000 98 76 <50 160 4,700 <10,000 <50 <50 <50 <2,000 <50 <50 NP <br /> Page 15 of 38 <br />