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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 I DTW Thkkness Elevation GRO/ Ethyl- Total <br /> M 06-4 Cont. Ethanol DPE ETRE TAME <br /> Date Monitored (feet) (feet) (feet) (feet) TPHS Benzene Toluene Benzene Xylenes MTBE ITBA 1,2-DCA EDB Footnote <br /> 4/12/2006 11.98 28.88 0.00 -16.90 2,300 69 300 100 380 67 <1,500 5.6 <25 <2.5 <100 19 <25 <br /> 7/12/2006 26.54 0.00 -14.56 9,400 940 1,300 720 3,300 63 <15,000 <25 <25 <25 <1,000 <25 <25 <br /> 10/19/2006 28.28 0.00 -16.30 2,300 210 38 80 270 46 <1,500 4.2 <2.5 <25 130 <2.5 QS <br /> 3/14/2007 27.22 0.00 -15.24 4,100 230 470 360 1,200 43 <3,000 <5.0 <5.0 <5.0 <200 G5.0 6.0 <br /> 5/15/2007 26.97 0.00 -14.99 - - _ _ _ _ _ -- _ • <br /> 5/17/2007 27.31 0.00 -15.33 4,600 320 370 320 990 49 <3,000 <5.0 <5.0 <5.0 <200 <5.0 6.0 <br /> 8/1/2007 27.51 ODO -15.53 - - - -- _ _ _ _ <br /> 8/3/2007 27.51 0.00 -15.53 1,300 220 5.8 50 48 28 <3,000 <5.0 <5.0 <5.0 <200 <5.0 G5.0 <br /> 11/20/2007 28.33 0.00 -16.35 4,700 430 650 380 1,000 81 <3,000 <5.0 <5.0 <5.0 <200 5.8 6.0 <br /> 1/21/2008 10.88 27.63 O.DO -16.75 - -- _ <br /> 1/22/2008 - - - 4,000 440 420 280 740 31 <3,000 <5.0 <5.0 <5.0 <200 6.0 <5.0 <br /> 4/7/2008 26.55 0.00 -15.67 - _ __ <br /> 4/9/2008 - - - 3,500 300 180 130 250 27 <300 2.9 <0.50 <0.50 79 <050 <O.50 <br /> 7/21/2008 27.83 O.DO -16.95 - - _ <br /> 8/22/2008 - - - 2,400 240 220 130 230 18 <3,ODO <5.0 <5.0 <5.0 <100 <5.0 <5.0 <br /> 10/20/2008 29.24 O.DO -18.36 - - _ <br /> 10/22/2008 - - - 1,700 87 110 55 110 12 <3,000 <5.0 <5.0 <5.0 <100 <5.0 6.0 <br /> 1/19/2009 29.55 0.00 -18.67 - - _ <br /> 1/22/2009 - - - 4,200 260 250 180 290 14 <3,000 <5.0 <5.0 <.5.0 <100 <5.0 6.0 <br /> 4/20/2009 28.80 0.00 -17.92 - _ _ <br /> 4/22/2009 - 3,900 190 220 150 210 11 <3,000 <5.0 <5.0 <5.0 <100 8.6 <5.0 <br /> 7/20/2009 29.40 0.00 -18.52 540 <0.50 <050 0.54 <0.50 10 - -- - - - 3.6 <br /> 1/7/2010 30.53 0.00 -19.65 2,100 120 80 39 72 10 - -- - - - <2.5 - <br /> 7/19/2010 28.06 0.00 -17.18 2,000 97 91 43 78 6.6 -- -- - - - 55 <br /> 1/5/2011 28.01 0.00 -17.13 - - _ <br /> 1/7/2011 - -- -- 630 31 33 14 27 4.7 - -- - - - <0.50 <br /> 8/2/2011 25.97 0.00 -15.09 150 <0.50 <050 <0.50 <0.50 2.8 - -- - - -- 0.67 <br /> 2/1/2012 25.68 0.00 -14.80 _ _ - <br /> 2/2/2012 - - -- 340 N 6.6 2.4 0.96 1.9 3.9 - - - - - 2.1 <br /> 8/2/2012 25.45 0.00 -14.57 170 <0.50 <050 <0.50 <I.0 3.4 - -- _ _ - 2.7 - <br /> Page 24 of 38 <br />