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Table 2.Historical Groundwater Monitoring and Analytical Data ARCO Station No.4932,16 East Harding Way,Stockton,CA TOO Product Water Level Concentrations in 1WL Well ID and Elevation DTW TAkkness Elevation GRO/ Ethyl• Total Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPS ETRE TAME TBA 1,2-DfA EDB Footnote DMW-6Cont. 2/25/2013 11.28 24.91 0.00 -13.63 -- - -' "" - - <10 <0.50 - 3/1/2013 - - <50 DMW-7 1/21/2008 10.76 27.98 0.00 -17.22 - - - - - -- - -- - - - -- - - <50 <0.50 <0. • - 50 <0.50 <0S0 3.4 <300 <O50 <0.50 <0.50 <20 0.77 <0.50 1/23/2008 - 4/7/2008 26.82 0.00 -16.06 - - - 4/8/2008 - - - <SO 054 1.0 <0.50 2.1 0.58 <300 <0S0 <0.50 <0.50 <10 0.86 <0.50 7/21/2008 28.15 0.00 -17.39 -- - - - 8/22/2008 - - <50 2.6 0.64 <0.50 1.0 26 <300 <0.50 <0.50 <0.50 <10 0.69 <0.50-- 10/20/2008 29.52 0.00 -18.76 -- - - - - 10/21/2008 - -- - <50 <0.50 <0.50 <050 <050 <0.50 <300 <0S0 <0.50 <0.50 <10 0.84 <0.50 1/19/2009 29.90 0.00 -19.14 - - - <10 <0.50 <0.50 1/20/2009 - -- -- <50 <0.50 <0.50 <0.50 <0.50 <0S0 <300 <0.50 <0.50 <0.50 4/20/2009 29.13 0.00 .18.37 - - - - 4/21/2009 - - <.50 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <O50 <0-50 <0.50 <10 <050 <0.50 -- - x.50 - _ <10 <050 1/7/2010 30.84 0.00 -20.08 <50 - - - -- - -- - -- - 1/5/2011 28.40 0.00 -17.64 - - - - - 3.0. <10 <0.50 - -' 1/6/2011 _ __ __ <50 - __ __ - - - - - __ 2/1/2012 25.82 0.00 -I5.06 cso - - 0.60 _ <10 <0.50 2/25/2013 24.67 0.00 -13.91 - - - <D.50'<D.50 _ _ _ <10 <0.50 - • - - - - 2/27/2013 - -- <50 DMW-9 1/21/2008 10.32 27.09 0.00 -16.77 1/23/2008 - -" - 580 <0.50 <OSO <050 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <20 0.76 <050 4/7/2008 26.73 0.00 -16.41 - - .50 <0.50 <0.50 <SO 0.65 <OSO 4/9/2008 - -- - 730 <0.50 <0.50 W50 05 <0 5 <0.50 <300 - - -- 1 .6 7/21/2008 27.59 0.00 -17.27 - - - - 590 <20 <20 <20 <20 <20 <12,000 <20 <20 <20 <400 <20 <20 8/22/2008 -- _ __ _ _ _ _ _ 10/20/2008 29.01 0.00 -18.69 - - -- -" Page 7 of 38