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, <br /> 404 N Wiget Lane <br /> Sequoia Walnut Geek CA 94598 <br /> (925)988-9600 <br /> Analytical FAX equo alabs9&3, c 73 <br /> www sequoialabs corn <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 /> 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 Limits RPD Limit Notes <br /> Batch ]IG23002-EPA 5030B(PIT) <br /> LCS(1G23002-BS2) Prepared&Analyzed 25-Jul-01 <br /> Methyl tert-butyl ether 637 20 ug/1 500 127 70-130 <br /> Surrogate Debromofluoromethane 510 .500 102 50-150 <br /> Surrogate 11-Drchloroethane-d4 503 500 101 50-150 <br /> Matrix Spike(1G23002-MSI) Source W107261-02 Prepared&Analyzed 25-Jul-01 <br /> Mcthyl ten-butyl ether 45 5 20 ugA 500 ND 880 60-150 <br /> Surrogate Dibromofluoromethane 475 500 950 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 487 500 974 50-150 <br /> Matrix Spike Dup(IG23002-MSD1) Source W107261-02 Prepared&Analyzed 25-Jul-01 <br /> Methyl tert-butyl ether 51 l 20 ug/1 500 ND 992 60-150 116 25 <br /> iiz ate Dibromofluoromethane 491 500 984 50-150 <br /> ate 12-Dichlaroeihane-d4 497 500 994 50-150 <br /> oia Analytical- Walnut Creels 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 16 of 18 <br />