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404 N.Wiget lane <br /> Walnut Geek,CA 94598 <br /> sequoia (925)988-9600 <br /> a, <br /> FAX(925)988-9673 <br /> Ana 7fical - ,N„ntv,sec,uoialahs.com� <br /> Project: Chevron <br /> Gettler Ryan,Inc.-Dublin <br /> Project Number: Chevron 4 9-3232 Reported: <br /> 6747 Sierra Court Suite) 03-Aug-01 07:33 <br /> Dublin CA,94568 Project Manager: Deanna L.Harding <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> n Reporting Spike Source %REC RPD <br /> Analyte x Result Limit Units Leve] Result %REC Limits RPD Limit Notes <br /> Batch IG30017-EPA 5030B(P/T) <br /> LCS(1G30017-BS1) Prepared&Analyzed:30-Jul-01 <br /> Methyl ten-butyl ether 51.3 2.0 ug/l 50.0 103 70-130 <br /> Surrogate:Dibromofluoromethane 47.2 50.0 94.4 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 46.4 50.0 92.8 50-150 <br /> LCS(1G30017-BS2) Prepared&Analyzed:31-Jul-01 <br /> Methyl tert-butyl ether 41.2 2.0 Ug/1 50.0 82.4 70-130 <br /> Surrogate:Dibromofluoromethane 48.3 50.0 96.6 50-150 # <br /> Surrogate:1,2-Dichloroethane-d4 47.7 50.0 95.4 50-150 x <br /> LCS(1G30017-BS3) Prepared&Analyzed:01-Aug-01 <br /> Methyl Cert-butyl ether 40.1 2.0 ug/1 c 50.0 80.2 70-130 <br /> Surrogate:Dibromojluoromethone 48.9 50.0 97.8 50-150 <br /> Surrogate., 48.4 50.0 96-8 50-150 <br /> : <br /> Matrix Spike(1G30017-MSI) Source:W107302-06 Prepared&Analyzed:O1-Aug-01 t <br /> Methyl ten-butyl ether 46.4 2.0 ug/i 50.0 ND 92.8 60-150 <br /> .Surrogate:Dibromofluoromethane 49.0 50.0 98.0 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 49.5 50.0 99.0 50-150 <br /> Matrix Spike Dup(1G30017-MSD1) Source:W107302706 Prepared&Analyzed:01-Aug-01 <br /> Methyl tent-butyl ether 51.6 2.0 ug/1 50.0 ND 103 60-150 10.6 25 <br /> Surrogate:Dibromofluoromethane 47.7 50.0 95.4 50-150 <br /> Surrogate: 1,2-Dichloroethane-d4 49.6 50.0 99.2. 50-150 <br /> - <br /> Sequoia Analytical- Walnut Creek M 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 en <br /> Page 9 of 10 <br />