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TABLE 2 <br /> h <br /> Groundwater Analytical Results for Oxygenates <br /> ARCO Service Station No 2186 <br /> 3212 North Califomia Street,Stockton,California <br /> Wel l <br /> Sample TBA MTBE DIPE ETBE TAME <br /> Number Date µ L W L ltL llAWL <br /> VW-113 3/16/01 <200 210 <2 0 <2 0 <2 0 <br /> 6/21/01 <100 94 <2 0 <2 0 <2 0 <br /> 9113/01 <710 1,100 <14 <14 <14 <br /> 12/11/01 170 1,700 <2 0 24 12 <br /> 3114/02 <5 0 63 <0 50 <0 50 <0 50 <br /> VW-213 3/16/01 <200 573 <2 0 <2 0 <2 0 <br /> 6121/01 <500* 780 <10* <10* <10* <br /> 9/13/01 <1,400 2,400 <29 <29 <29 <br /> 12/11/01 34 450 <2 0 <2 0 25 <br /> 3114/02 20 320 <0 50 <0 50 25 <br /> VW 3B 11/20/97 <100 <2 0 <2 0 <2 0 <2 0 <br /> 2/17/98 NA NA NA NA NA <br /> 6/24/98 <200 <2 0 <2 0 <2 0 <2 0 <br /> 9/21/98 310 235 <2 0 <2 0 <2 0 <br /> 12/14/98 <200 43 2 <2 0 <2 0 5 11 <br /> 3/31/99 <200 <2 0 <2 0 <2 0 <2 0 <br /> 6/11/99 <200 548 <2 0 <2 0 <2 0 <br /> 9/10/99 <1,000 1,500 <10 <10 123 <br /> 12/3199 <200 262 <2 0 <2 0 208 <br /> 4/3100 <200 252 <2 0 <2 0 <2 0 <br /> 6/22/00 <200 3,180 <2 0 <2 0 23 <br /> 9/27/00 NS NS NS NS NS <br /> 12/20/00 <200 592 <2 0 <2 0 <2 0 <br /> 3/16/01 <200 9 12 <2 0 <2 0 <2 0 <br /> 6/21/01 <3,800* 5,000 <77* <77* <77* <br /> 9113/01 <100 90 <2 0 <2 0 <2 0 <br /> 12/11/01 <20 200 <2 0 <2 0 <2 0 <br /> 3/14/02 <5 0 26 <0 50 <0 50 <0 50 <br /> Oxygenates analyzed usin6 USEPA Method 8260 TBA-Ternary butyl alcohol <br /> y/L—Analytical results in micrograms per liter MTBE—Methyl tertiary butyl ether <br /> a Below detection limit for analytical methods used DIPE—Di isopropyl ether <br /> A Not analyzed ETBE—Ethyl tertiary butyl ether <br /> NS Not sampled TAME Tertiary amyl methyl ether <br /> i This sample was analyzed outside of the EPA recommended holding time <br /> The reported value exceeds the calibration curve but not the linear range <br /> * Raised MRL due to high analyte concentration requiring sample dilution <br /> Delta <br /> ARCO_2186_QuaMrty Data XLS 3 of 3 <br />