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TABLE 3 <br /> GROUNDWATER ANALYTICAL SUMMARY <br /> Former ARCO Station No 6100 <br /> 25775 Patterson Pass Road <br /> Tracy,California <br /> Ethyl- Total <br /> Sample Date GRO+ Benzene Toluene benzene Xylenes MTBE <br /> ID Collected IL IL /L /L <br /> NOTES <br /> t=Results through the first quarter 2004 include purgeable hydrocarbons in the range of C6-C 10 QA/QC Review <br /> GRO=Gasoline Range Organics A=Data accepted without qualification <br /> TSE—Methyl tertiary butyl ether µp/L=micrograms per liter J=Data accepted with qualification <br /> DW=Domestic Well R=Data rejected <br /> [1]=The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits <br /> [2]=Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel <br /> [3]=Discrete peak @ C-6 <br /> [4]=Discrete peak @ C5-C7 <br /> [5]=There was insufficient preservative to reduce the sample pH to less than 2 The sample was analyzed beyond the 7 days holding time for unpreserved samples, <br /> therefore the results for BTEX should be considered estimated with a possible low bias <br /> [6]=The reported results may be biased high as demonstrated by a high surrogate recovery due to matrix interference <br /> [71=The reported result should be considered estimated,the sample was initially analyzed within holding time but required dilution The dilution was performed out of <br /> holding time <br /> [8]=The reported result may be biased high due to a high average percent recovery reported in the associated LCS analysis <br /> [91=The reported result should be considered estimated,the samples were initially analyzed within holding time but required a lesser dilution The lesser dilution was <br /> performed out of holding time <br /> [101=The reported result should be considered estimated due to a high relative percent difference reported between the associated LCS and LCSD <br /> [1 l]=The reported result may be biased low due to a low average percent recovery reported in the associated MS/MSD analysis <br /> [12]=The reported result may be biased high due to a high average percent recovery reported in the associated MS/MSD analysis <br /> [13]=The reported result should be considered estimated,the samples were initially analyzed within holding time but required reanalysis due to QA/QC failure The reanalysis <br /> was performed out of holding time <br /> Arco_6100_Quarterly_Data Page 8 of 8 5rRAT[15 <br />