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Table 2.Historical Groundwater Monitoring and Analytical Data
<br /> Former ARCO Station No.443,2478 East Oak Street,Stockson,CA
<br /> TOC Product Water Level Concentrations in Rg/L
<br /> Well ID and Elevation DTW Thickness Elevation GRO/ Ethyl- Total
<br /> Date Monitored (feet) (feet) (feet) (feet) TPHg Benzene Toluene Benzene Xylenes MTBE Ethanol DIPE ETBE TAME TBA 1,2 DCA EDB Footnote
<br /> MW-1S Cont.
<br /> 5/20/2010 22.69 49.60 0.00 -26.91 -- -- -- -- -- -- -- -- -- -- -- -- DRY
<br /> 11/11/2010 _. _. _
<br /> _ We
<br /> 6/6/2011 I 45.70 0.00 -23.01
<br /> w.n
<br /> 11/2/2011 44.88 0.00 -22.19 140,000 11,000 35,000 5,000 24,000 <200 -- -- - - 14,000 EXT
<br /> 12/8/2011 44.37 0.00 I -21.68 6200000 16,000 40,000 4,400 280000 -- -- -- -- -- -- 1,500 <500
<br /> i
<br /> 1/31/2012 43.58 0.00 -20.89 130,000 12,000 34,000 4,700 23,000 -- -- -- -- -- -- 1,300 <500 EXT
<br /> 2/28/2012 43.43 0.00 -20.74 140,000 9,300 26,000 30600 18,000 -- -- -- -- -- -- 1,200 <500 EXT •
<br /> 3/27/2012 43.03 0.00 -20.34 160,000 12,000 380000 4,60D 23,000 - -- -- -- - -- 1,600 750 EXT
<br /> 4/24/2012 42.94 0.00 -20.25 110,000 8,500 24,000 3,200 160000 -- -- -- -- - -- 880 <500 EXT
<br /> 6/4/2012 42.57 0.00 -19.88 160,000 12,000 33,000 30600 19,000 <500 <300,000 600 <500 1500 110,000 1,300 <500
<br /> 12/17/2012 43.20 I'� 0.00 -20.51 -- -- -- -- -- __
<br /> 12/18/2012 -- - - 110,000 13,000 32,000 4,300 26,000 -- - -- -- -- -- <250 <250
<br /> 6/17/2013 43.11 0.00 -20.42 110,000 17,000 33,000 4,000 18,000 1250 -- <250 1250 1250 115,000 <250 <250
<br /> MW-25
<br /> 7/30/2007 22.51 45.72 0.00 -23.21 60,000 12,000 8,400 3,400 11,000 <100 - 1100 <100 <100 <4,000 2,200 <100
<br /> 9/17/2007 46.80 0.00 - -24.29 53,000 12,000 7,000 3,800 12,000 <100 - <100 <100 <100 <4,000 2,300 d00
<br /> 12/13/2007 47.31 0.00 -24.80 57,000 13,000 10,000 3,500 13,000 <100 i <60,OOD 1100 <100 1100 14,000 2,000 1100
<br /> 3/20/2008 46.31 OA0 -23.80 94,000 15,000 9,500 3,400 12,000 15.0 - 15.0 15.0 . 15.0 1100 2,400 15.0
<br /> 6/13/2008 46.41 0.00 -23.90 59,000 12,000 3,600 20500 9,200 <250 - <250 <250 <250 <5,000 2,600 <250
<br /> 9/11/2008 48.78 0.00 -26.27 23,000 5,000 <250 1,000 3,000 <250 -- 250 <250 <250 <5,000 1,600 <250
<br /> 12/12/2008 49.60 0.00 -27.09 41,000 7,800 530 1,600 5,000 <250 - <250 <250 <250 �<5,000 2,200 <250
<br /> 3/11/2009 49.90 0.00 -27.39 38,000 11,000 500 1,600 5,000 <250 -- <250 1250 <250 <5,000 2,400 <250 •
<br /> 5/19/2009 - __ -_ _ _. -_ __ _ _ _ _ _- INA
<br /> 6/10/2009 50.17 ODD -27.66 37,000 10,000 <200 2,300 5,400 <200 -- <200 <200 <200 <4,000 2,100 <200
<br /> 11/16/2009 52.34 0.00 -29.83 21,000 4,200 <100 970 1,600 -- -- - I -- -- -- 230 <100
<br /> r 5/20/2010 49.35 .. 0.00 -26.84 3,000 510 6.5 94 85 <5.0 <3,000 15.0 <5.0 <5.0 <100 <5.0 15.0
<br /> 11/11/2010 49.00 0.00 -26.49 670 N 5.1 2.6 2.9 4.0 -- -- -- -- -- -- 12 <0.50
<br /> 6/6/2011 45.45 _ 0.00 -22.94 710 N 3.3 <0.50 6.0 0.56 - -- -- -- -- -- 9.3 <0.50
<br /> 12/8/2011 44.11 1 0.00 -21.60 410 N 15 <D.50 4.6 <0.50 -- -- -- - - -- 7.5 <0.50
<br /> 6/4/2012 42.35 0.00 -19.84 I 190 N 1.4 I <0.50 0.89 <0.50 <0.50 1300 <0.50 <0.50 <0.50 I <10 I 4.1 <0.50
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