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�I 404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-%73corn www sequoialabs cam <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-6171 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 31-Jul-01 07 59 <br /> MTBE Confirmation 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 Limits RPD Limit Notes <br /> Batch IG26012- EPA 5030B(PIT) <br /> Matrix Spike(IG26012-MSI) Source W107224-05 Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> Methyl tert-butyl ether 652 20 ug/1 500 ND 130 60450 <br /> Surrogate D[bromofluoromethane 500 500 100 50-150 - <br /> Surrogate 1 2-Dichloroethane-d4 460 500 920 50-150 <br /> Matrix Spike Dup(1G26012-MSD1) Source W107224-05 Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> Methyl tert-butyl ether 546 20 ugll 500 ND 109 60-150 177 25 <br /> Surrogate DibromoJluoromethane 520 500 104 50-150 <br /> Surrogate 1,1-Dichloroethane-d4 480 500 960 50-150 <br /> ola 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 14 of 18 <br />