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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
<br /> FGft0gj Ethyl- TotalDate Monitored (feet) (feet) (feet) (feet) HBenzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2-DCA EDB Footnote
<br /> EW-7 Coat.
<br /> 12/3/2003 NS - - - 31,000 <3,000 <5,000 <3,000 <1,000 90,000 - -- - - - - -
<br /> 1/12/2004 31.75 0.00 -- 44,000 <2,500 <2,500 <2,500 <2,500 110,000 <100 4.2 <1.0 <1.0 <20 7.6 <0.50
<br /> 4/26/2004 30.17 0.00 - <250,000 <2,500 <2,500 <2500 <2,500 150,000 <500,OD0 <2,500 <2,500 <2,500 100, <2,500 <2,500
<br /> 7/13/2004 11.09 - - - <10,000 <100 <100 <100 <100 5,200 <20,000 <100 <100 <100 <4,000 <100 <100 DRY
<br /> 10/27/2004 36.86 0.00 -25.77 <25,000 <250 <250 <250 <250 27,000 <50,000 <250 <250 <250 <10,OOC <250 <250 NP
<br /> 1/13/2005 - -- - 810 <50 <50 <50 <50 1,900 <10,000 <100 <100 <100 <2,000 <50 <50 NP
<br /> 4/13/2005 30.91 0.00 -19.82 <50 <0.50 <0.50 <0.50 <050 90 <100 <0.50 <0.50 <0.50 <20 15 <0.50
<br /> 7/11/2005 34.96 0.00 -23.87 1,300 <5.0 6.0 <5.0 10 1,500 <1,000 <5.0 <5.0 <5.0 <200 6.0 <5.0
<br /> 10/5/2005 29.95 0.00 -18.86 1,200 N <10 <10 <10 <10 1,000 <2,000 <10 <10 <10 590 30 <10 c
<br /> 1/13/2006 30.12 0.00 -19.03 <1,ODO <10 <10 <10 <10 22 <6,000 <10 <10 <10 <400 <10 <10
<br /> 4/12/2006 28.96 0.00 -17.87 <1,000 <10 <10 <10 <10 43 <6,000 <10 <10 <10 <400 <10 <10
<br /> 7/12/2006 27.07 0.00 -15.98 <50 <0.50 <0.50 <0.50 <050 4.6 <300 <0.50 <0.50 <0.50 22 5.0 <050
<br /> 10/18/2006 27.61 0.00 -16.52 180 <2.5 <2.5 <2.5 <25 200 <1,500 <2.5 <2.5 3.0 <100 5.2 QS
<br /> 3/12/2007 28.99 0.00 -17.90 1,400 <10 <10 <10 <10 2,300 <6,000 <10 <10 <10 <400 20 <10 NP
<br /> 5/15/2007 - - -- 1,100 N <10 <10 <10 <10 1,800 <6,000 <10 <10 <10 <400 15 <10
<br /> 8/1/2007 29.02 0.00 -17.93 1,100 N <10 <10 <10 <10 1,500 <6,000 <10 <10 <10 <400 20 <10
<br /> 11/20/2007 27.91 0.00 -16.82 - - - - - - - - - - - - -
<br /> 11/21/2007 -- 0.00 - 160 N <0.50 <0.50 <050 <0.50 120 <300 0.83 <0.50 <0.50 43 9.4 <050
<br /> 1/21/2008 10.12 27.15 0.00 -17.03 440 <1.0 <1.0 <1.0 <1.0 670 <600 1.2 <1.0 <1.0 <40 14 <1.0
<br /> 4/7/2008 26.09 0.00 -15.97 -- - - -- - - - -- - - - - -
<br /> 4/9/2008 - - - <50 <050 <050 <050 <050 11 <300 <0.50 <0.50 <0.50 <10 3.4 <0.50
<br /> 7/21/2008 27.55 0.00 -17.43 - - -- -- -- - - -- - - - - -
<br /> 7/22/2008 - -- - <50 <0.50 <0.50 <0.50 <0.50 3.1 <300 <0.50 <0.50 <0.50 <10 1.2 <0.50
<br /> 10/20/2008 28.81 0.00 -18.69 - - - -- -- - - -- - - - - -
<br /> 10/21/2008 - - - <50 <0.50 <050 <050 <050 8.7 <300 <050 <0.50 <0.50 <10 0.86 <050
<br /> 1/19/2009 29.15 0.00 -19.03 - - - - - - - -- - - - -- -
<br /> 1/20/2009 - - - <50 <0.50 <0.50 <0.50 <0.50 6.1 <300 <0.50 <0.50 <0.50 <10 <050 <050
<br /> 4/20/2009 28.39 0.00 -18.27 <50 <0.50 <0.50 <050 <050 3.6 <300 <0.50 <0.50 <0.50 <10 <050 <0.50
<br /> 1/5/2011 27.64 0.00 -17.52 - - - -- - - - -- - - - - -
<br /> 1/7/2011 - - -- <50 <0.50 <0.50 <0.50 <0.50 2.2 <300 <0.50 <0.50 <0.50 <10 058 <0.50
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