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Sequoia Walnut Geek,CA 945988 <br /> 1 (925)988-9600 <br /> Analytical FAX equo alabs c 73 <br /> www sequol%8-coin <br /> fittler Ryan,bic -Dublin Project Chevron <br /> 6747 Sierra Court Suite 7 Project Number Chevron 4 9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Hardmg 16-Oct-00 08 25 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lutist Units Level Result %REC Limits RPD Limit Notes <br /> Batch 0J09033-EPA 5030B [P/Tl <br /> Blank(OJ09033-BLKI) Prepared&Analyzed 10-pct-00 <br /> Ethanol ND 500 ug/1 <br /> tert-Butyl alcohol ND 50 <br /> Methvl ter[-butyl ether ND 20 " <br /> Di-isopropvl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Drbromofluoromethane 500 500 100 50-150 <br /> Surrogate 1 2-Drchlomethane-d4 390 SO 0 780 50-150 <br /> LCS(OJ09033-BS1) Prepared&Analyzed )0-Oct-00 <br /> Methyl tert-butyl ether 378 20 ug/I 500 756 70-130 <br /> Wate Drbromofluoromethane 480 500 960 50-150 <br /> ate 12-Dichloroelhane-d4 360 500 72O 50-150 <br /> Matrix Spike(OJ09033-MSI) Source W009631-01 Prepared&Analyzed 10-Oct-00 <br /> Methyl tert-butyl ether 341 20 ug/1 500 ND 682 60-150 <br /> Surrogate DibromoJluoromethane 450 500 900 50-150 <br /> Surrogate 1 1-Dichloroethane-d4 360 500 720 50-150 <br /> Matrix Spike Dup (0J09033-MSDI) Source W009631-01 Prepared&Analyzed 10-Oct-00 <br /> Methyl tert-butyl ether 330 20 ug/1 Soo ND 660 60-150 328 25 <br /> Surrogate Dibromofluoromeihane 450 Soo 900 50-150 <br /> Surrogate 1 1-Dtchloroethane-d4 360 500 720 50-150 <br /> Soia Analytical-Walnut Creek 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 6 of 10 <br />