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TABLE 3 <br /> GROUNDWATER ANALYTICAL SUMMARY <br /> ARCO Service 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 /L /L IL <br /> NOTES <br /> +=Results through the first quarter 2004 include purgcable hydrocarbons to the range of C6-C I0 QA/QC Review <br /> GRO=Gasoline Range Organics A=Data accepted without qualification <br /> TBE=Methyl tertiary butyl ether µg/L=micrograms per Mer J=Data accepted with qualification <br /> DW=Domestic Well R=Data refected <br /> jl]=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 /> [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 <br /> holding time <br /> [$]=The reported result may be bused high due to a high average percent recovery reported in the associated LCS analysis <br /> Arco_6100_Quarterly_Data Page 6 of 6 5TRAW5 <br />