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404 N Wlget Lane <br /> Sequoia Walnut 5)t X4959080 <br /> FAX(9Z5)988-9673 <br /> Analytical '""""' u°'a'abs�� <br /> Gettler Ryan,hie -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 06-Jun-01 08 21 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Lints RPD Lunit Notes <br /> Batch 1E23005-EPA 5030B(P/T) <br /> Matrix Spike(1E23005-MSI) Source W105351-03 Prepared&Analyzed 23-May-01 <br /> Methyl Cert-butyl ether 362 20 ugll 500 ND 724 60-150 <br /> Surrogate Dibromofluoromeihane 410 500 820 50-150 <br /> Surrogate 1 2 Dichloroethane-d4 418 500 856 50-150 <br /> Matrix Spike Dup(1E23005-MSDI) Source W105351-03 Prepared&Analyzed 23-May-01 <br /> Methyl tent-butyl ether 432 20 ug/l Soo ND 86 4 60-150 176 25 <br /> Surrogate Dibromofluoromethane 418 500 836 50-150 <br /> Surrogate i 2-Dichloroethane-d4 455 500 910 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the thaw <br /> custody document This analytical report must be reproduced in its enter <br /> Page 9 of 12 <br />