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TABLE 2 <br /> FUEL OXYGENATES ANALYTICAL DATA <br /> ARCO Service Station No.548 <br /> 1612 Hammer Lane,Stockton,California <br /> Well TBA MtBE DIPE ETBE TAME 1,2-DCA <br /> Number Date ppb ppb b ppb ppb ppb <br /> MW-6 9/28/2000 <200 3.98 <2 <2 <2 29.2 <br /> (cont_) 12/18/00[1] <200 <2 <2 <2 <2 NA <br /> 3/14/2001 <20 2.12 <1.0 <1,0 <1.0 28.8 <br /> 6/1912001 <100 7.2 C2 <2 <2 17 <br /> 9/11/2001 <100 6.8 <2 <2 <2 14[2] <br /> 12/13/2001 <5.0 21 <0.50 <0.50 <0.50 4.4 <br /> 3/12/2002 <5.0 0.53 <0.50 <0.50 <0.50 7.6 <br /> 9/9/2002 <5 1 <0.5 <0.5 <0.5 1 <br /> VW-1 12/13/2001 22 87 <0.50 <0.50 <0.50 4.5 <br /> 3/12/2002 <5.0 0.68 <0.50 <0.50 <0.50 2.7 <br /> 9/9/2002 16 60 <0.5 <0.5 <0.5 2.2 <br /> VW-2 12/13/2001 32 1.5 <0.50 <0.50 <0.50 28 <br /> 3/12/2002 <5.0 <0.50 <0.50 <0.50 <0.50 0.80 <br /> 9/9/2002 17 4.4 <0.5 <0.5 <0.5 12 <br /> VW-3 12/13/2001 59 16 <0.50 <0.50 <0.50 8.2 <br /> 3/12/2002 <5.0 0.72 <0.50 <0.50 <0.50 2.5 <br /> • 9/9/2002 6.3 1.6 <OS <0.5 <0.5 4.4 <br /> VW-4 12/13/2001 <5.0 100 <0.50 <0.50 <0.50 12 <br /> 3/12/2002 <5.0 32 <0.50 <0.50 <0.50 5.3 <br /> 9/9/2002 <5 110 <0.5 <0.5 <0.5 5.9 <br /> VW-5S 3/12/2002 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 9/9/2002 <5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> VW-5D 12/13/2001 <50[3] 67[3] <5.0[3] <5.0[3] <5.0[31 83131 <br /> 3/12/2002 890 <2.5[3] <2.5[3] <2.5[3] <2.5[31 <2.5133 <br /> 9/9/2002 290 <5 <5 <5 <5 <5 <br /> pg/L=micrograms per liter. TBA=Tertiary butyl alcohol. <br /> Oxygenates analyzed by USEPA Method 8260. MtBE=Methyl tert-butyl ether. <br /> =Below detection limit for analytical methods used. DIPS=Di-isopropyl ether. <br /> A=not analyzed. ETBE=Ethyl tertiary butyl ether. <br /> [11 This sample was analyzed outside EPA recommended holding time. TAME=Tertiary amyl methyl ether. <br /> [2]The opening calibration verification standard was outside acceptance 1,2-DCA=1,2-Dichloroethane <br /> limits by<3%. Although the Lab Control Sample verified the accuracy of <br /> this batch,this should be considered in evaluating the data for its intended purpose. <br /> [3]The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. <br /> [4]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. <br /> Beginning third quarter 2002,the data quality analyses are presented in the text. <br /> • <br /> 0548 OMR3002.XLS 2 of 2 <br />