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819 Striker Ave Ste 8 <br /> / Sequoia Sacramento C6 <br /> (916)92121 9600 <br /> FAX(916)921-0100 <br /> Analytical <br /> www sequoialabs coin <br /> Oettler-Ryan-Petaluma Project Tosco 11192,Stockton,CA S212209 <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 12/31/02 11 16 <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 2120306-EPA 5030E [MeOHI <br /> Blank(2120306-BLK1) Prepared&Analyzed 12/18/02 <br /> Di-Isopropyl ether ND 0 25 mg/kg <br /> Ethyl Cert-butyl ether ND 025 " <br /> Tert-amyl methyl ether ND 0 25 " <br /> Ethanol ND 10 " <br /> 1,2-Dichloroethane ND 0 25 " <br /> 1,2-Dibromoethane(FDB) ND 0 25 " <br /> Surrogate 12-DCA-d4 00396 00500 79 60-140 <br /> Laboratory Control Sample(2120306-BSI) Prepared&Analyzed 12/18/02 <br /> Methyl tert-butyl ether 00399 00050 mg/kg 00500 80 60-140 <br /> rogate 1 2-DCA-d4 00423 " 00500 85 60-140 <br /> Laboratory Control Sample Dnp(2120306-BSDI) Prepared&Analyzed 12/18/02 <br /> Methyl tert-butyl ether 00423 00050 mg/kg 00500 85 60-140 6 25 <br /> Surrogate 1 2-DCA-d4 00418 1100500 84 60-140 <br /> quota Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page I I of 13 <br />