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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 Thic ss Elevation GRO/ Ethyl- Total
<br /> Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPS ETBE TAME TBA 1,2-DCA EDB Footnote
<br /> MW-6 Cont.
<br /> 4/28/2003 11.50 29.96 0.00 -18.46 <50,000 600 <500 600 600 30,000 <100,000 6D0 600 600 20, <500 <500
<br /> 7/29/2003 31.44 0.00 -19.94 60,000 600 <500 600 600 37,000 <100,000 600 600 600 20, 600 <SW
<br /> 10/8/2003 32.98 0.00 -21.48 35,000 <250 <250 <250 <250 32,000 60,000 <250 <250 <250 30, <250 <250
<br /> 1/12/2004 32.45 0.00 -20.95 9,700 600 600 <500 <500 21,000 <100,000 <1,000 <3,000 <5,000 20, 600 600
<br /> 4/26/2004 30.96 0.00 -19.46 19,000 <050 <0.50 <0.50 <0.50 16,000 <100 <0.50 <0.50 30 <4,000 4.8 <0.50
<br /> 7/14/2004 32.27 0.00 -20.77 60,000 600 <500 600 600 15,000 <100,000 600 600 600 20,000 <500 600
<br /> 10/27/2004 34.28 0.00 -22.78 <10,000 <100 <100 <100 <100 16,000 <20,000 <100 <100 <100 <4,000 <100 <100
<br /> 1/13/2005 34.52 0.00 -23.02 5,900 <250 <250 <250 <250 9,600 60,000 600 600 600 c10,00C <250 <250
<br /> 4/13/2005 31.12 0.00 -19.62 4,400 N <25 <25 <25 <25 4,300 6,000 <25 <25 <25 <3,000 <25 <25
<br /> 7/11/2005 30.35 0.00 -18.85 <2,500 <25 <25 <25 <25 3,300 <5,000 <25 <25 <25 <5,000 <25 <25
<br /> 10/5/2005 31.81 0.00 -20.31 1,600 <12 23 <12 21 1,500 <2,500 <12 <22 <12 <500 <12 <12
<br /> 1/13/2006 30.83 0.00 -19.33 86 <0.50 <0.50 <0.50 <050 55 <3D0 <0.50 <0.50 <0.50 <20 3.4 <0.50
<br /> 4/12/2006 28.65 0.00 -17.15 80 <0.50 <050 <0.50 <0.50 45 <300 <050 <0.50 <0.50 <20 3.9 <0.50
<br /> 7/12/2006 26.96 0.00 -15.46 60 <0.50 <0.50 <0.50 <0.50 2.4 <300 <0.50 <0.50 <0.50 <20 1.3 <0.50
<br /> 10/18/2006 28.19 0.00 -16.69 60 <0.50 <0.50 <0.50 <050 0.61 <300 <0.50 <0.50 <0.50 <20 1.2 <0.50
<br /> 3/13/2007 27.55 0.00 -16.05 <50 <0.50 <0.50 <050 <0.50 5.6 <300 <050 <0.50 <0.50 <20 3.3 <0.50
<br /> 5/15/2007 26.34 0.00 -14.84 - - - -- - -- - - - - - -- -
<br /> 5/16/2007 26.39 0.00 -14.89 60 <0.50 <0.50 <D50 <0.50 2.1 <300 <0.50 <0.50 <0.50 <20 2.2 <0.50
<br /> 8/1/2007 27.89 0.00 -16.39 - - - -- -- - - -- - -- - - -
<br /> 8/2/2007 27.89 0.00 -16.39 60 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <20 1.2 <0.50
<br /> 11/20/2007 28.66 0.00 -17.16 - - - -" - - "" -" - - - -- -
<br /> 11/21/2007 - - - 60 <0.50 <050 <030 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <20 1.1 <050
<br /> 1/21/2008 10.83 27.94 0.00 -17.11 - - - -- -- - - -- - -- - - -
<br /> 1/23/2008 - -- - 60 <0.50 <0.50 <0.50 <0.50 1.6 <300 <0.50 <0.50 <0.50 <20 1.4 <050
<br /> 4/7/2008 26.86 0.00 -16.03 - - - - - - - -
<br /> 4/8/2008 -- - - <50 <0.50 <0.50 <0.50 <050 <0.50 <300 <0.50 <0.50 <0.50 <10 1.0 <0.50
<br /> 7/21/2008 28.25 0.00 -17.42 - - - -- - - - -- - - - -- -
<br /> 7/22/2008 - -- - 60 <0.50 <0.50 <0.50 <0.50 <0.50 <300 <0.50 <0.50 <0.50 <10 0.89 <050
<br /> 10/20/2008 29.61 0.00 -18.78 - - - -- - - - -- - -- - - -
<br /> 10/21/2008 - - - <50 <0.50 <0.50 <050 <0.50 <0.50 <300 <050 <0.50 <0.50 <10 2.1 IC50
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