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Sequoia • 819 Striker Avenue,Suite8 <br /> ra <br /> Sacmento,CA 95834 ' <br /> (916)921-9600 <br /> IWF 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 /> > Reported: <br /> Sacramento CA,95833 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 Rpp <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080274-EPA 5030B IP/T] <br /> LCS(2080274-BS1) Prepared&Analyzed:08/28/02 <br /> Methyl tert-butyl ether 0.0422 0.0050 mg/kg 0.0436 97 60-140 ' <br /> Benzene 0.0262 0.0050 0.0268 <br /> 98 70-130 <br /> Toluene 0.185 0.0050 0.162 114 70-130 <br /> Gasoline(C6-C10) 1.92 1.0 2.20 87 70-130 ' <br /> Surrogate:1,2-DCA-d4 0.0444 0.0500 89 60-140 <br /> Surrogate:Toluene-d8 0.0564 0.0500 113 60-140 <br /> Surrogate:4-BFB 0.0529 0.0500 106 60-140 <br /> Matrix Spike(2080274-MSI) Source:S208335-02 Prepared&Analyzed:08/28/02 ' <br /> Methyl tert-butyl ether 0.0412 0.0050 mg/kg 0.0436 ND 94 60-140 <br /> Benzene 0.0253 0.0050 0.0268 ND 94 60-140 <br /> Toluene 0.179 0.0050 0.162 ND 110 60-140 <br /> Gasoline(C6-C10) 1.50 1.0 2.20 ND 68 60-140 <br /> Surrogate:1,2-DCA-d4 0.0452 0.0500 90 60-140 <br /> Surrogate:Toluene-d8 0.0579 0.0500 116 60-140 ' <br /> Surrogate:4-BFB 0.0574 0.0500 115 60-140 <br /> Matrix Spike Dup(2080274-MSDI) Source:5208335-02 Prepared&Analyzed:08/28/02 <br /> Methyl tert-butyl ether 0.0409 0.0050 mg/kg 0.0436 ND 93 60-140 0.7 25 <br /> Benzene 0.0249 0.0050 0.0268 ND 93 60-140 2 25 <br /> Toluene 0.173 0.0050 0.162 ND 106 60-140 3 25 <br /> Gasoline(C6-C10) 1.44 1.0 2.20 ND 65 60-140 4 25 <br /> Surrogate:1,2-DCA-d4 0.0448 0.0500 90 60-140 <br /> Surrogate:Toluene-d8 0.0575 0.0500 115 60-140 <br /> Surrogate:4-BFB 0.0575 0.0500 115 60-140 <br /> Batch 2080295-EPA 5030B McOH ' <br /> Blank(2080295-BLKI) Prepared&Analyzed:08/29/02 <br /> Ethanol ND 20 mg/kg ' <br /> Tert-butyl alcohol ND 5.0 " <br /> Methyl ten-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 , <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 ' <br /> Benzene ND 0.50 " <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Ais analytical report must be reproduced in its entirety. <br /> Page Page 8 of 11 , <br />