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TABLE 2
<br /> Historical Groundwater Monitoring &Analytical Data
<br /> ARCO Station No. 443
<br /> 2478 East Oak Street, Stockton, CA
<br /> TOC Depth to Measuredjl'i
<br /> Well No. Date Notes Elevation Water 6PHGROBT E X MTBE TBA DIPE ETBE TAME Ethanol1.2-DCA EDB D.O. Comments
<br /> (levabo (leery ThicknesIpNLI (pNU (p9/L) (PBfL) (pg/L) (PNU (p9/U (pgfL) (pg/L) (p9/L) (pNL) (PNU (pg/y (mg/U(feet)
<br /> MWAD 07/30/07 22.94 46.30 000 -23.36 67,000 3,000 14000 2,700 12,000 150 12,000 150 150 150 - 200 75 1.57 Well Developed
<br /> 09/17,97 47.30 0.00 -24.36 59,000 3,300 16,000 3,200 14,000 000 14,000 1100 1700 1100 - 160 000 2.15
<br /> 12/13107 47.73 0.00 .2479 48,000 2,800 14,000 3,000 12,000 1100 14,000 <100 1700 1700 160.000 140 1100 1.68 Purged dry
<br /> 03120/08 46.57 0.00 -23.63 33,000 1,500 6,900 1,100 4.300 45.0 <100 <5.0 45.0 <5.0 150 20 0.76
<br /> MWAS 07/30/07 22.68 45.93 0.00 -23.25 930,000 13,000 58,000 17,000 79,000 1500 <20,W0 1500 1500 1500 - 1,500 510 1.62 Well Developed
<br /> 09/17107 47.14 0.00 -24.46 380,000 13,000 47,000 8,600 42,000 <250 110,000 <250 1250 1250 - 1,400 390 2.94 •
<br /> 12/13107 47.60 0.00 .24.92 220,000 13,000 43,000 7,200 36,000 1250 00,000 <250 <250 1250 <150,000 1,600 510 1.48
<br /> 2312010! 416,49 0.00 -23.81 180,000 16,000 33,000 6,500 37,000 4250 <5.000 4250 4250 <250 2,100 630 0.85
<br /> MW-2S 07/.10/07 22.51 45.72 0.00 -23.21 60,000 12,000 8,400 3,400 11,0DD <100 14,000 1100 <100 1100 - 2,200 <100 1.25 Well Developed
<br /> 09/1707 46.80 0.00 -24.29 53,000 12,000 7,000 3,800 12,ODD 1700 -4,000 <100 <100 <100 - 2,300 <100 1.76
<br /> 12/13107 47.31 000 -24.80 57,000 13,000 10,000 3,500 13,000 1700 14,000 1100 1100 <100 <60,000 2,000 1700 1.31
<br /> 03/20108 46.31 0.00 -2390 94,000 15.000 9,500 3.400 12.000 <5.0 <100 45.0 45.8 45.0 2AOO 15.0 0.81
<br /> MW-3S 070007 23.42 46.64 0.00 -23.22 1,200 130 9.7 -5.0 46 15.0 <200 15.0 <5.0 <9.0 - 630 15.0 1.24 Well Developed
<br /> 08/1707 47.79 DOD -24.37 830 N 79 14 5.4 38 <5D 1200 15.0 15.0 15.0 - 620 15.0 2.7
<br /> 12/1307 48.26 0.W -24.84 700 N 47 <5D 7.0 26 <5.0 1200 15.0 <5.0 15.0 <3,000 620 <5.0 1.43
<br /> 0312008 47.05 0.00 -23.63 780 35 2.3 2.6 19 <0.50 110 40.50 40.50 40.50 310 90.50 1.01
<br /> MW-4S 07/3007 2296 46.15 DOD -23.19 200 10.50 0.64 00.50 1.3 10.50 <20 10.50 10.50 10.50 - 7.8 10.50 1.2 Well Developed
<br /> 09/1707 47.33 0.00 -24.37 200 2.1 <0.50 <0.50 10.50 10.50 <20 <0.50 10.50 <D50 - 4.9 <D50 2.94
<br /> 12/1307 47.79 000 -24.83 240 <0.50 1.3 10.50 28 10.50 120 10.50 <0.50 <0.50 1300 6.2 <0.50 1.53
<br /> 0312008 46.72 0.00 .23.76 350 10.50 <0.50 <0.50 <0.50 10.50 110 10.50 <0.50 10.50 22 40.50 092
<br /> Notes
<br /> GRO=Gasoline range organics
<br /> B=Benzene
<br /> T=Toluene •
<br /> E=Ethylbenzene
<br /> X=Total xylenes
<br /> MTBE=Methyl tert-butyl ether
<br /> TBA=Tert-butyl alcohol
<br /> DIPE=Di-isopropyl ether
<br /> ETRE=Ethyl tert-butyl ether
<br /> TAME=Tert-amyl methyl ether
<br /> 1,2-DCA =1,2-Dichlorcethane
<br /> EDB=1,2-0ibromoethane
<br /> D.O.=Dissolved Oxygen
<br /> SPH=Separate-phase hydrocarbons
<br /> TOC=Top of casing(surveyed)
<br /> Calc GW Elev.=Calculated groundwater elevation=TOC-Depth to Water*0.75'(Measured SPH Thickness)',assuming a specific gravity of 0.75 for SPH
<br /> 0-MSL=feet above mean sea level
<br /> mg&=Milligrams per liter
<br /> pg/L=Micrograms per liter
<br /> <=Analyte was not detected above the specified method detection limit(MDU
<br /> -=Not measured or analyzed
<br /> Beginning In the first quarter 2008,the carbon range for GRO was changed from C4-C12 to CGC12.
<br /> 443 1008 Tables.xls Page 1 of 1 SECOR
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