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• • 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> �& 7 (916)921-9600 <br /> Analvtical 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 Reported: <br /> Sacramento CA,95833 Project Manager. Vernon Elarth 08/22/02 17:33 <br /> Volatile Organic Compounds 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 2080219-EPA 5030B[MeOH] <br /> Blank(2080219-BLK1) Prepared&Analyzed:08/22/02 <br /> Tert-butyl alcohol ND 2.5 mg/kg <br /> Methyl tert-butyl ether ND 0.25 <br /> Di-isopropyl ether ND 0.25 11 <br /> Ethyl tert-butyl ether ND 0.25 <br /> Tert-amyl methyl ether ND 0.25 <br /> Surrogate:1,2-DCA-d4 2.26 2.50 90 60-140 <br /> LCS(2080219-BSI) Prepared&Analyzed:08/22/02 <br /> Methyl tert-butyl ether 0.844 0.25 mg/kg 1.25 68 60-140 <br /> Surrogate:1,2-DCA-d4 2.35 11 2.50 94 60-140 <br /> LCS Dup(2080219-BSDI) Prepared&Analyzed:08/22/02 <br /> Methyl tert-butyl ether 0.861 0.25 mg/kg 1.25 69 60-140 2 25 <br /> Surrogate:1,2-DCA-d4 2.31 2.50 92 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 3 of 4 <br />