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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 GRD/ Ethyl- Total
<br /> Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene %ylenes MTBE Ethanol RIPE ETRE TAME TBA 3,2-DCA EDB Footnote
<br /> EW-3 Cont.
<br /> 5/16/2007 10.92 26.81 0.00 -15.89 <50 <0.50 <0.50 <0.50 <050 <0.50 <300 <0.50 <0.50 <0.50 <20 0.96 <0.50
<br /> 8/1/20D7 27.21 0.00 -16.29 -- -
<br /> 8/2/2007 27.21 0.00 -16.29 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <20 1.3 <0.50
<br /> 11/20/2007 27.99 0.00 -17.07 - - _
<br /> 11/21/2007 -- -- -- <50 0.65 0.80 <0.50 15 2.4 <300 <0-50 <0.50 <0.50 <20 3.2 <0-50 •
<br /> 1/21/2008 10.33 27.31 0.00 -16.98 _
<br /> 1/23/2008 - - -- <50 <0.50 <050 <050 <0.50 1.2 <300 <0.50 <0.50 <0.50 <20 2.2 <0.50
<br /> 4/7/2008 26.19 0.00 -15.86 - - _
<br /> 4/8/2008 -- -- - 60 <0.50 <050 <0.50 <0.50 <0.50 <300 <0.50 <050 <0.50 <10 1.9 <050
<br /> 7/21/2008 27.54 0.00 -17.21 - - _ __ _
<br /> 7/22/2008 - -- - 60 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 IC50 <0.50 <10 1.4 <0.50
<br /> 10/20/2008 28.90 0.00 -18.57 -- _ _
<br /> 10/21/2008 - -- - <50 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <10 1.6 <0.50
<br /> 1/19/2009 29.20 0.00 -18.87 - _ _
<br /> 1/20/2009 -- -- -- <50 <0.50 <0.50 <0.50 <050 <0.50 <300 <0.50 <0.50 <0.50 <10 0.70 <0.50
<br /> 4/20/2009 29.42 0.00 -19.09 - - _
<br /> 4/21/2009 - - -- <50 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <050 <0.50 <0.50 <10 <0.50 <0.50
<br /> 1/7/2010 30.20 0.00 -19.87 60 - - - - <0.50 - -- - -- <10 1.8
<br /> 1/5/2011 27.79 0.00 -17.46 -- -
<br /> 1/6/2011 - - - 60 - _ _- _ <0.50 - -- - <10 1.5
<br /> 2/1/2012 25.26 0.00 -14.93 <50 - -- -- - <0.50 - - - - <10 1.4
<br /> 2/25/2013 24.15 0.00 -13.82 - -
<br /> 2/27/2013 - _ _ 60 _ _ _ -- - - -
<br /> <0.50 - -- - - <10 1.9 -
<br /> EW-4
<br /> 9/3/2003 NS - - - 37,000 <2500 <2,500 <2,500 <2,500 100,000 -- -- _ _
<br /> 12/3/2003 - - - - 12,000 <5,000 <5,000 <1,000 <1,000 110,000 - -- _ _
<br /> 1/12/2004 32.40 0.00 - 30,000 <2,500 <2,500 <2,500 <2,500 96,000 <500,000 6,000 <5,000 6,000 100, <2,500 <2,500
<br /> 4/26/2004 30.93 0.00 -- 39,000 <250 <250 <250 <250 49,000 60,000 <250 <250 <250 17,000 <250 <250
<br /> 7/14/2004 11.38 32.28 0.00 -20.90 <100,000 <1,000 <1,000 <1,000 <1,000 40,000 <200,000 <1,000 <1,000 <1,000 40, <11000 <1,000
<br /> 8/4/2004 - -- - 60,000 600 600 600 <500 30,000 <100,000 <500 600 600 20, 600 <5W
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