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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 /> Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene %ylenes MTBE Ethanol DIPE ETRE TAME TBA 1,2-DCA EDB Footnote <br /> DM W-5 Cont. <br /> 7/22/2008 12.27 - - -- <50 <0.50 <0.50 <0.50 <0.50 0.90 <300 <050 <0.50 <0.50 <10 3.3 <0.50 <br /> 10/20/2008 30.63 0.00 -18.36 - - _ <br /> 10/22/2008 - - - <50 <0.50 <050 <0.50 <0.50 1.6 <300 <050 <0.50 <0.50 <10 5.8 <0.50 <br /> 1/19/2009 31.00 0.00 -18.73 -- - -- __ <br /> 1/22/2009 - - - <50 <0.50 <0.50 <OSO <0.50 1.0 <300 <0.50 <0.50 <0.50 <10 3.7 <050 • <br /> 4/20/2009 30.25 0.00 -17.98 - - <br /> 4/22/2009 - - -- <50 <0.50 <0.50 <0.50 <050 1.0 <300 <050 <0.50 <0.50 <10 4.9 <050 <br /> 1/7/2010 32.02 0.00 -19.75 <50 - - -- - <0.50 - -- - -- <10 1.4 <br /> 1/5/2011 29.58 0.00 -17.31 - - <br /> 1/7/2011 - -- - <50 - - -- - <0.50 - - - - <10 <O.50 <br /> 2/1/2012 27.03 0.00 -14.76 <50 - -- - - <0.50 - - - <10 0.71 <br /> 2/25/2013 25.96 0.00 -13.69 -- - <br /> 2/28/2013 - - - <50 - - - - <0.50 - - - - <10 057 - <br /> DMW-6 <br /> 1/21/2008 11.28 24.93 0.00 -13.65 - <br /> 1/23/2008 - -- -- <50 <0.50 <0.50 <0.50 <0.50 33 <300 3.9 <0.50 <0.50 <20 10 <050 <br /> 4/7/2008 27.11 0.00 -15.83 - - <br /> 4/9/2008 - - - <50 <0.50 <0.50 <0.50 <0.50 30 <300 4.1 <0.50 <0.50 <10 8.8 <050 <br /> 7/21/2008 28.41 O.DO -17.13 - - __ _- <br /> 7/22/2008 - - - <50 <0.50 <0.50 <0.50 <0.50 3.4 <300 3.2 <0.50 <0.50 <10 11 <050 • <br /> 10/20/2008 29.84 O.DO -18.56 - - -- <br /> 10/22/2008 - - - <50 <0.50 <0.50 <0.50 <0.50 7.0 <300 4.0 <0.50 <0.50 <10 9.1 <0.50 <br /> 1/19/2009 30.15 0.00 -18.87 -- - _ <br /> 1/21/2009 - -- - <50 <0.50 <050 <0.50 0.60 <0.50 <300 0.58 <0.50 <0.50 11 1.6 <0.50 <br /> 4/20/2009 29.42 0.00 -18.14 -- - <br /> 4/22/2009 - - -- <50 <0.50 <050 <050 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <10 0.61 <0.50 <br /> 1/7/2010 31.13 0.00 -19.85 <50 - - -- - <0.50 - -- - - <10 0.50 <br /> 1/5/2011 28.61 0.00 -17.33 - - <br /> 1/7/2011 - - -- <50 - - -- - <0.50 - - - <10 <0.50 <br /> 2/1/2012 26.04 0.00 -14.76 <50 - - - - 052 - -- - -- <10 <0.50 - <br /> Page 6 of 38 <br />