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• • Striker Avenue,Suite 8 <br /> Sequoia 819 Sacramento,CA 95834 ' <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com ' <br /> URS-Sac,Gateway Oaks Project: ARCO 760,Lodi,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 Project Number: 760,Lodi,CA <br /> Sacramento CA 95833 Reported: <br /> Project Manager: Vernon Elarth 08/30/02 13:59 <br /> Gasoline\BTEX\Oxygenates 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 2080229-EPA 5030B IP/TJ , <br /> Blank(2080229-BLKI) Prepared&Analyzed:08/23/02 <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 tent-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 /> Gasoline(C6-C10) ND 1.0 <br /> Surrogate:1,2-DCA-d4 0.0468 0.0500 94 60-140 ' <br /> Surrogate:Toluene-d8 0.0559 0.0500 112 60-140 <br /> Surrogate:4-BFB 0.0543 0.0500 109 60-140 <br /> LCS(2080229-BSI) Prepared&Analyzed:08/23/02 ' <br /> Methyl tert-butyl ether 0.0409 0.0050 mg/kg 0.0436 94 60-140 <br /> Benzene 0.0252 0.0050 0.0268 94 70-130 <br /> Toluene 0.181 0.0050 0.162 112 70-130 <br /> Gasoline(C6-C10) 1.81 1.0 2.20 82 70-130 i <br /> Surrogate:1,2-DCA-d4 0.0449 0.0500 90 60-140 <br /> Surrogate:Toluene-d8 0.0538 0.0500 108 60-140 <br /> Surrogate:4-BFB 0.0510 0.0500 102 60-140 ' <br /> Matrix Spike(2080229-MSI) Source:S208270-07 Prepared&Analyzed:08/23/02 <br /> Methyl tert-butyl ether 0.0407 0.0050 mg/kg 0.0436 ND 93 60-140 <br /> Benzene 0.0246 0.0050 0.0268 ND 92 60-140 , <br /> Toluene 0.178 0.0050 0.162 ND 109 60-140 <br /> Gasoline(C6-C10) 1.80 1.0 2.20 ND <br /> 82 60-140 <br /> Surrogate:1,2-DCA-d4 0.0442 0.050088 60-140 <br /> Surrogate:Toluene-d8 0.0536 0.0500 <br /> 107 60-140 <br /> Surrogate:4-BFB 0.0511 0.0500 <br /> 104 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 6 of l 1 ' <br />