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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 HROS/ Ethy4 Total <br /> Date Monitored (feet) (feet) (feet) (feet) Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2-11CA EDB Footnote <br /> MW-5 Cont. <br /> 8/3/2007 11.78 28.27 0.00 -16.49 140 N <2.5 <25 <2.5 <2.5 220 <1,500 <2.5 <2.5 <25 <100 16 <25 <br /> 11/20/2007 29.12 0.00 -17.34 - - - -_ - - <br /> 11/21/2007 - - -- 160 N <0.50 <050 <0.50 <0.50 210 <300 <0.50 <0.50 <0.50 36 13 <050 <br /> 1/21/2008 11.20 28.40 0.00 -17.20 - - - -- _ - - <br /> 1/22/2008 - - - 170 <1.0 <1.0 <1.0 <1.0 290 <600 <1.0 <1.0 <1.0 <40 17 <1.0 • <br /> 4/7/2008 27.31 0.00 -16.11 - - - - _ <br /> 4/9/2008 - -- - <50 <0.50 <050 <0.50 <0.50 160 <300 <0.50 <0.50 <0.50 11 10 <050 <br /> 7/21/2008 28.60 0.00 -17.40 - - - -- - - <br /> 7/22/2008 - - - <50 <2.0 <2.0 <2.0 <2.0 70 <1,200 <2.0 <2.0 <2.0 <40 3.9 <2.0 <br /> 10/20/2008 30.03 0.00 -18.83 -- - - - _ - _ <br /> 10/22/2008 - - -- <50 <2.5 <25 <2.5 <2.5 55 <1,500 <2.5 <25 <2.5 <50 3.7 Q.5 <br /> 1/19/2009 30.15 0.00 -18.95 - - - -- _ _ - <br /> 1/21/2009 - -- - <50 <2.0 <2.0 <2.0 <2.0 75 <1,200 <2.0 <2.0 <2.0 <40 35 <2.0 <br /> 4/20/2009 29.65 0.00 -18.45 - - - -- _ __ __ <br /> 4/22/2009 - - - <50 <2.0 <2.0 <2.0 <2.0 110 <1,200 <2.0 <2.0 <2.0 <40 5.9 Q.0 <br /> 1/7/2010 31.35 0.00 -20.15 <50 - - - - 46 - -- - - <20 1.9 - <br /> 1/5/2011 28.85 0.00 -17.65 - - - ._ _ _ <br /> 1/6/2011 - - - <50 - - -- - 240 _ -- - - <10 7.0 - <br /> 2/1/2012 26.24 0.00 -15.04 - - - -- _ - <br /> 2/2/2012 - - -- <50 - - - = 260 -- - - <100 60 - • <br /> 2/25/2013 25.08 0.00 -13.88 -- - -- -- <br /> 2/28/2013 -- - - <50 - - - - 0.52 -- -- - -- <10 <050 - <br /> MW-6 <br /> 7/20/2001 11.50 27.43 0.00 -15.93 6,000 <50 X50 <50 <50 67,000 -- <100 <100 <100 C10100C <100 <100 <br /> 10/22/2001 29.32 0.00 -17.82 <20,000 <200 <200 <200 <200 82,000 - <1,000 <1,000 <11000 1001 <11000 <5,000 <br /> 1/15/2002 28.56 0.00 -17.06 <50,000 <500 <500 <500 <500 65,000 - <500 <500 600 <5,000 <500 <500 <br /> 4/11/2002 27.84 0.00 -16.34 60,000 600 600 600 600 57,000 -- 600 600 600 6,000 600 600 <br /> 7/12/2002 29.00 0.00 -17.50 31,000 N <200 <200 <200 <200 43,000 -- 600 600 600 <5,000 -- - <br /> 11/20/2002 31.43 0.00 -19.93 30,000 N <200 <200 <200 <200 57,000 - 60 60 68 2,500 60 60 b <br /> 1/30/2003 30.68 0.00 -19.18 <25,000 <250 <250 <250 <250 48,000 <200,000 <2,500 <2,500 <2,500 100, <2,500 <2,500 <br /> Page 26 of 38 <br />