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TABLE 3 GROUNDWATER ANALYTICAL SUMMARY ARCO Service Station No 6100 25775 Patterson Pass Road Tracy,California Ethyl- Total Sample Date GRO+ Benzene Toluene benzene Xylenes MTBE ID Collected /L NOTES +=Results through the first quarter 2004 include purgeable hydrocarbons to the range of C6-C 10 QA/QC Review GRO=Gasoline Range Organics A=Data accepted without qualification TBE=Methyl tertiary butyl ether µglL=micrograms per Mer ]=Data accepted with qualification DW=Domestic Well R=Data refected [1]=The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits [2]=Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel [3]=Discrete peak @ C-6 [4]=Discrete peak @ C5-C7 [51=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, therefore the results for BTEX should be considered estimated with a possible low bias [6]=The reported results may be biased high as demonstrated by a high surrogate recovery due to matrix interference [7]=The reported result should be considered estimated,the sample was initially analyzed within holding time but required dilution The dilution was performed out of holding time 181=The reported result may be biased high due to a high average percent recovery reported in the associated LCS analysis [9]=The reported result should be considered estimated,the samples were initially analyzed within holding time but required a lesser dilution The lesser dilution was performed out of holding time [10]=The reported result should be considered estimated due to a high relative percent difference reported between the associated LCS and LCSD [11]=The reported result may be biased low due to a low average percent recovery reported in the associated MS/MSD analysis Arco_61D0_Quarterly_Data Page 6 of 6 STIZATUS