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Table 2 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station No. 548 <br /> 1612 W. Hammer Lane, Stockton, CA <br /> Notes: <br /> --=not measured or analyzed <br /> <=below detection limit for analytical methods used <br /> pg/L=micrograms per liter <br /> 1,2-DCA=1,2-dichloroethane <br /> DIPE=di-isopropyl ether <br /> EtBE=ethyl tertiary butyl ether <br /> MtBE=methyi tert-butyl ether <br /> MW=monitoring well <br /> NA=not analyzed <br /> TAME=tertiary amyl methyl ether <br /> TBA=tertiary butyl alcohol <br /> U.S.EPA=United States Environmental Protection Agency <br /> VW=vapor well <br /> [1]This sample was analyzed outside U.S. EPA recommended holding time. <br /> [2]The opening calibration verification standard was outside acceptance limits by c3%. Although the laboratory 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 because the presence of high levels of non-target analytes resulted in elevated reporting limits. <br /> [4]The sample was diluted because the presence of high levels of target analytes resulted in elevated reporting limits. <br /> Data quality analyses are presented in the text beginning in the third quarter of 2002. <br /> 3/11/2004-VW-5S and VW-51D data are rejected because of a discrepancy during sampling. <br /> Oxygenates analyzed by U.S. EPA Method 8260B. <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 represents its approxmate concentration. <br /> UJ=The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and may or may not represent the actual limit of quantitation <br /> necessary to accurately and precisely measure the analyte in the sample. <br /> R=The sample results are rejected because of identification or other analytical issues. <br /> ND=Not detected above reported detection limit. <br /> Report Date:November 17,2005 Page 9 of 9 <br />