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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 <br /> Well ID and Elevation DTW Thickness Elevation GRO/ Concentrations In Pg/L <br /> Date Monitored (feet) Ethyl- total <br /> ( ) (feet) (feet) (feet) TPNg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2-DCA EDB Footnote <br /> DM W-9 Cont. <br /> 10/21/2008 10.32 - .0 - 630 <20 <br /> - <20 <20 <20 <12,000 <20 <20 <20 <400 <20 <20 <br /> 1/19/2009 29.05 0.00 -18.73 - _ _ <br /> 1/21/2009 - - - 570 <20 <20 <20 <20 <20 <12,000 QO <20 <20 <400 <20 <br /> 4/20/2009 28.43 0.00 -18.11 - <20_ _ <br /> 4/22/2009 - - <50 <0.50 <050 <0.50 <0.50 <0.50 <300 <050 <0.50 <0.50 <10 Ns0 <0.50 • <br /> 1/5/2011 27.55 0.00 -17.23 -- _ _ <br /> 1/7/2011 - - - 880 N <0.50 <0.50 <050 <0.50 <0.50 <300 <050 <0.50 <0.50 <10 <050 <0.50 <br /> 0 -1 <br /> 2/25/2013 24.16 0.03.84 -- _ <br /> DMW-10 13 - - - 820 <0.50 <0.50 <0.50 <1.0 <0.50 <br /> - <0.50 c0.50 <0.50 <30 <0.50 <0.50 <br /> DM W- <br /> 3/7/2008 12'20 29'39 0.00 -17.19 <50 <0.50 <0.50 <0.50 <0.50 210 <300 <0.50 <0.50 <0.50 34 <br /> 4/7/2008 29.05 0.00 -16.85 <br /> 4/8/2008 - _ _ 8.3 <0.50 8/22/2008 -- 76 <10 <10 <10 <10 490 <6,000 <10 <20 <10 <200 21 <10 <br /> 30.97 0.00 -18.77 X50 <0.50 <050 <0.50 <0.50 8.2 <300 <br /> 10/20/2008 31.89 0.00 -19.69 - _ <0.50 <0.50 <0.50 c10 18 <0.50_ <br /> 10/22/2008 .40 0.0.00 -- <50 <0.50 <050 <0.50 <0_ <br /> 1/19/2009 32. .50 <0.50 <300 <0.50 <0.50 <0.50 <10 28 <0.50 <br /> -20.20 - _ _ <br /> 1/21/2009 - _-- -- <50 <0.50 <0.50 <050 0.53 5.9 <300 <0.50 <0.50 <0.50 <10 16 <br /> 4/20/2009 31.71 0.00 -19.51 - _ <0.50_ <br /> 4/22/2009 -- -- <50 051 <050 <050 0.85 4.9 <300 <0.50 <0.50 <0.50 <10 IS <0.50 • <br /> 7/20/2009 32.80 0.00 -20.60 <50 <0.50 <0.50 <050 <0.50 2.7 <br /> 1/5/2011 30.50 0.00 -18.30 -_ _ _ - -- - - - 15 - <br /> 1/7/2031 - -- -- <50 <0.50 <0.50 <050 <050 25 <300 <0.50 <0.50 <0.50 <10 11 <0.50 <br /> 4/23/2013 26.80 0.00 -14.60 _ <br /> <0.50 <0.50 <0.50 <1.0 46 - -- <br /> EW-1 - - - zs - <br /> 4/11/2002 11.83 27.95 0.00 -16.12 <200,000 9,900 40,000 4,700 24,000 520,000 <br /> 7/12/2002 29.04 0.00 -17.21 350,000 13,000 49,000 6,100 34,000 460,000 <2,500 <2,500 <2,500 25, <2,500 <2,500 <br /> 11/20/2002 - 150 <100 260 2,800 <br /> 31.47 Sheen -19.64 - _ _ - <br /> 1/30/2003 29.30 0.00 -17.47 220,000 8,000 31,000 4,400 23,000 200,000 <200,000 <2,SW <2,500 <2,500 100, <2,500 <2,500 <br /> Page 8 of 38 <br />