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' • • 885 Jarvis Drive <br /> aSequoia Morgan Hill,CA 95037 <br /> — ) (408)776-9600 <br /> ' Analytical. FAX(408)782-6308 <br /> www.sequoialabs.con <br /> URS Corporation III Project: ARCO#760,Lodi,CA. <br /> ' 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#760,Lodi,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/24/02 08:51 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> ' Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> ' Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2J21016-EPA 5035 <br /> Blank(2J21016 BLK1) Prepared&Analyzed:10/17/02 <br /> Ethanol ND 40 ug/1 <br /> tert-Butyl alcohol ND 20 <br /> Metbyl tert-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 /> Ethylene dibromide ND 0.50 <br /> Surrogate:1,2-Dichloroethane-d4 4.71 5.00 94.2 78-129 <br /> ' LCS(2J21016-BSI) Prepared&Analyzed: 10/17/02 <br /> Methyl cert-butyl ether 10.0 0.50 ug/1 10.0 100 63-137 <br /> Surrogate:1,2-Dichloroethane-d4 4.68 5.00 93.6 78-129 <br /> ' LCS Dup(2J21016-BSD1) Prepared: 10/17/02 Analyzed: 10/18/02 <br /> Methyl tert-butyl ether 11.4 0.50 ug 1 10.0 114 63-137 13.1 13 QR-02 <br /> Surrogate:l,2-Dichloroethane-d4 4.65 5.00 93.0 78-129 <br /> ' Sequoia Analytical-Morgan Hill 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 /> ' 5 of 6 <br />