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• 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> URS-Sac,Gateway Oaks Project: ARCO 760,Lodi,CA <br /> Project Number: 760,Lodi,CA Reported: <br /> 2870 Gateway Oaks Dr.,Ste.300 <br /> Project Manager: Vernon Elarth 08/30/02 13:59 <br /> Sacramento CA,95833 <br /> GasolineTTEMOxygenates 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 JP/Tl <br /> Matrix Spike Dup(2080229-MSDI) Source:S208210-07 Prepared 8c Analyzed:08/23/02 <br /> Methyl tert-butyl ether 0.0406 0.0050 mg/kg 0.0436 ND 93 60-140 0.2 25 <br /> Benzene 0.0248 0.0050 0.0268 ND 93 60-140 0.8 25 <br /> Toluene 0.182 0.0050 0.162 ND 112 60-140 2 25 <br /> Gasoline(C6-C10) 1.84 1.0 I 2.20 ND 84 60-140 2 25 <br /> Surrogate:1,2-DCA-d4 0.0437 0.0500 87 60-140 <br /> Surrogate:Toluene-d8 0.0533 0.0500 107 60-140 <br /> ' <br /> Surrogate:4-BFB 0.0507 0.0500 101 60-140 <br /> Batch 2080274-EPA 5030B JP/TJ <br /> Blank(2080274-BLKl) Prepared&Analyzed:08/28/02 <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 /> Gasoline(C6-C 10) ND 1.0 " <br /> ' <br /> Surrogate:1,2-DCA-d4 0.0457 I, 0.0500 91 60-140 <br /> Surrogate:Toluene-d8 0.0552 0.0500 110 60-140 <br /> Surrogate:4-BFB 0.0535 0.0500 107 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 11 <br />