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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 Ethanol <br /> Number Date yWL pgrL pg1L p9/L pg/L p91L pg/L <br /> VW-513 12113/2001 ¢50[3] 67[3] <5.0[3] <5.0[3] ¢5.0[3] 83[3] NA <br /> 3/12/2002 890 ¢2.5[3] <2.5[3] <2.5[3] <2.5[3] <2.5[3] NA <br /> 9/9/2002 290 <5 <5 <5 <5 <5 NA <br /> 12/4/2002 <4,000 <100 <100 <100 <100 <100 NA <br /> 3/3/2003 <200 <5 <5 <5 <5 <5 <1000 <br /> mg/L=micrograms per liter. TBA=Tertiary butyl alcohol. <br /> Oxygenates analyzed by USEPA Method 8260. MtBE=Methyl tart-butyl ether. <br /> <=Below detection limit for analytical methods used. DIPS==Di-isopropyl ether. <br /> NA=not analyzed. ETRE=Ethyl tertiary butyl ether. <br /> [i]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 /> K:1WprocessU5 13P ARC0105481Quarterly\1 QTR 0310548 GWMR 1Q03 <br /> 3of3 <br />