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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 pglL pg/L pg/L pWL pglL pglL pg/L <br /> VW-5D 12/13/2001 <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(a) <br /> 6/3/2003 <40 <1.0 <2.0 <2.0 <2.0 <1.0 <200 <br /> 9/18/2003 Not Sampled <br /> Notes: <br /> Oxygenates analyzed by USEPA Method 8260. <br /> (a)5123103 Revised analytical report replaces the 3126/03 report to correct the reporting limit for Ethanol from 40 pg1L to 100,vg1L. <br /> [1]This sample was analyzed outside EPA recommended holding time. <br /> [2]The opening calibration verification standard was outside acceptance <br /> limits by<3%. Although the Lab Control Sample veered 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 /> < = Below detection limit for analytical methods used. <br /> 1,2-DCA = 1,2-Dichloroethane <br /> DIPE = Di-isopropyl ether. <br /> ETBE = Ethyl tert butyl ether. <br /> mg/L = micrograms per liter. <br /> MTBE = Methyl tert-butyl ether. <br /> NA = not analyzed. <br /> TAME = Tert amyl methyl ether. <br /> TBA = Tert butyl alcohol. <br /> Data Qualifier Definitions: <br /> U The analyte was analyzed for,but was not detected above the sample reporting limit. <br /> J The analyte was positively identified;the associated numerical value is the approximate concentration of the analyte in the sample. <br /> N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a"tentative identification." <br /> NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value <br /> represents its approximate concentration. <br /> UJ The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and <br /> may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample. <br /> R The sample results are rejected due to serious deficiencies in the ability to analyze the sample (i.e.,the presence or absence <br /> of the analyte cannot be verified)or the analyte identification has been rejected(i.e.,the presence of the analyte cannot be verified). <br /> ND Not detected above reported detection limit <br /> K:1W process\J5 BP ARCp1005481Quarteriyl3 QTR 0310548 OMR 3003 <br /> Page 4 of 4 <br />