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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 Pg/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-1D
<br /> 7/30/2007 22.94 46.30 0.00 -23.36 67,000 3,000 14,000 2,700 12,000 <50 -- <50 <50 <50 22,000 200 75
<br /> 9/17/2007 47.30 0.00 -24.36 59,000 3,300 16,000 3,200 14,000 <100 -- <100 <100 <100 <4,000 160 <100
<br /> 12/13/2007 47.73 0.00 I -24.79 48,000 2,800 14,000 3,000 12,000 <100 <60,000 <100 <100 <100 <4,000 140 <100
<br /> 3/20/2008 46.57 0.00 -23.63 33,000 1,500 6,900 1,100 4,300 <5.0 -- <5.0 <5.0 <5.0 <100 150 20 •
<br /> 6/13/2008 46.82 0.00 -23.88 32,000 1,200 7,100 2,200 9,000 <100 -- <100 <100 <100 <2,000 140 <100
<br /> o �a
<br /> 9/11/2008 49.30 0.00 -26.36 35,000 980 6,200 1,900 8,100 <100 -- i <100 <100 <100 <2,000 110 <100 gallon:
<br /> 12/12/2008 50.21 0.00 -27.27 29,000 460 2,800 930 5,200 <100 -- <300 <100 <100 <2,000 110 <100
<br /> 3/11/2009 50.30 0.00 -27.36 25,000 450 2,500 1,400 6,900 <50 - <50 <50 <50 <1,000 150 <50
<br /> 5/19/2009 22.90 50.40 0.00 -27.50 19,000 300 1,100 990 4,300 <50 I -- <50 <50 <50 <1,000 92 <50
<br /> 11/16/2009 52.78 0.00 -29.88 28,000 340 600 1,800 7,500 31 <25 o.y@as
<br /> gallons
<br /> 5/20/2010 49.89 0.00 -25.99 24,000 290 360 1,900 6,800 <50 <30,000 <50 <50 <50 <1,000 <50 <50
<br /> 11/11/2010 49.39 0.00 -26.49 43,000 240 400 1,800 5,800 -- - -- -- -- - <50 <50
<br /> 6/6/2011 45.80 0.00 -22.90 37,000 200 220 1,700 5,800 - 1 - -- -- -- - <50 <50
<br /> 12/8/2011 44.67 0.00 SII -21.77 -- -- -- -- -- --
<br /> 12/9/2011 -- - -- 32,000 170 67 1,600 5,700 -- - -- -- - - <50 <50
<br /> 6/4/2012 42.77 0.00 -19.87 17,000 72 41 1,000 1,700 <20 <12,000 <20 <20 <20 <400 <20 <20
<br /> 12/17/2012 43.40 0.00 -20.50 -- - -- -- -- -- "" -" "- -- -- --
<br /> 12/18/2012 -- -- - 6,900 63 32 890 1,200 -- -- -- -- -- -- <10 <10
<br /> 6/17/2013 43.35 0.00 -20A5 9,200 100 29 1,100 1,300 <10 -- <10 <10 <10 <200 <10 <10
<br /> MW-15
<br /> 7/30/2007 22.68 45.93 0.00 -23.25 930,000 13,000 58,000 17,000 79,000 <500 -- <500 1 <500 <500 <20,000 1,500 510
<br /> 9/17/2007 47.14 0.00 -24.46 380,000 13,000 47,000 8,600 42,000 <250 - <250 <250 <250 10,000 1,400 390
<br /> 12/13/2007 47.60 0.00 -24.92 220,000 13,000 43,000 7,200 36,000 <250 <150,0001 <250 <250 <250 10,000 1,600 510
<br /> 3/20/2008 46.49 0.00 -23.81 180,000 16,000 33,000 6,500 37,000 <250 -- <250 <250 <250 <5,000 2,100 630
<br /> 6/13/2008 46.65 0.00 -23.97 180,000 16,000 54,000 9,000 48,000 <500 - <100 <510 <500 <111,000 2,100 <500
<br /> 9/11/2008 49.30 0.00 -26.62 590,000 15,000 49,000 22,000 110,000 <1,000 - <1,000 <1,000 <1,000 20,000 2,200 <1,000
<br /> 12/12/2008 49.51 0.00 -26.83 810,000 14,000 76,000 22,000 120,000 <2,000 - <2,000 <2,000 <2,000 <40,000 2,500 <2,000
<br /> 3/11/2009 50.12 Sheen -27.44 420,000 18,000 51,000 6,400 34,000 <2,500 -- <2,500 <2,500 <2,500 <50,000 <2,500 <2,500
<br /> 5/19/2009 22.69 50.10 0.00 -27.41 220,000 14,000 52,000 7,000 35,000 <1,000 - <1,000 <I,000 <1,000 20,000 1,800 <I,000
<br /> 11/16/2009 52.59 I 0.02 -29.89 -- -- -- -- -- _ "� -- -" "" -- -- --
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