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D404 Sequoia N A lane <br /> Walnut GC <br /> Creek J\94598 <br /> (925)908-9600 <br /> FAX(925)988-%73 <br /> Analytical www sequolalabs eom <br /> Getter Ryan,lie -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron t19-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 13-Mar-01 16 55 <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 Lunits RPD Limit Notes <br /> Batch 1CO2013-EPA 5030B [P/T1 <br /> Math Spike(1002013-MSI) Source W102552-02 Prepared&Analyzed 02-Mar-01 <br /> Methyi tert-butyl ether 608 20 ugA 500 ND 122 60-150 <br /> Surrogate D+bromofluoromethane 548 Soo 110 50-150 <br /> Surrogate 12 Dtchlaroethane-d4 502 Soo 100 50-150 <br /> Matnx Spike Dup (ICO2013-MSD1) Source W102552-02 Prepared&Analyzed 02-Mar-01 <br /> Methyl tat-butyl ether 597 20 ug/I 500 ND 119 60-150 183 25 <br /> Surrogate Dibromofluoromethane 529 " 500 106 50-150 <br /> Surrogate 1 2-Dtehloroethane-d4 496 500 992 50-150 <br /> S ia Analytical-Walnut Creek The results in tins report apply to the samples analyzed in accordance with the than of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />