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819 Striker Avenue,Suite 8 <br /> 4DFAXSe uoia Sactaznen 016)9 95834 <br /> 9600 q (9t6,9z,-96o0Anal tical (916)921-0100 <br /> www.sequoialabs.com <br /> URS Sac,Gateway Oaks Project: ARCO 5450,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 Project Number: 5450,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vernon Elarth 09/04/02 11:19 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080300-EPA 5030B(PIT] <br /> Blank(2080300-BLKI) Prepared&Analyzed:08/29/02 <br /> Ethanol ND 0.20 mg/kg <br /> Tert-butyl alcohol ND 0.050 " <br /> Methyl tert-butyl ether ND 0.0050 <br /> Di-isopropyl ether ND 0.0050 " <br /> Ethyl tert-butyl ether ND 0.0050 " <br /> Tert-amyl methyl ether ND 0.0050 " <br /> 1,2-Dichloroethane ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 <br /> Benzene ND 0.0050 <br /> Ethylbenzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> W <br /> rrogate:l,2-DCA-d4 0.0446 0.0500 89 60-140 <br /> rrogate:Toluene-d8 0.0564 0.0500 113 60-140 <br /> Surrogate:4-BFB 0.0554 0.0500 111 60-140 <br /> Blank(2080300-BLK2) Prepared&Analyzed:08/30/02 <br /> Ethanol ND 0.20 mglkg <br /> Tert-butyl alcohol ND 0.050 " <br /> Methyl tert-butyl ether ND 0.0050 <br /> Di-isopropyl ether ND 0.0050 " <br /> Ethyl tert-butyl ether ND 0.0050 " <br /> Tert-amyl methyl ether ND 0.0050 " <br /> 1,2-Dichloroethane ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 " <br /> Benzene ND 0.0050 <br /> Ethylbenzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> Surrogate:1,2-DCA-d4 0.0426 0.0500 85 60-140 <br /> Surrogate:Toluene-d8 0.0586 0.0500 117 60-140 <br /> Surrogate:4-BFB 0.0578 0.0500 116 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 7 of 9 <br />