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C <br /> Sequoia C <br /> 404 N A Lane <br /> Walnut Creek CA 44598 <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequoialabs corn <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-1848 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 27-Jul-01 10 26 <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 Limas RPD Limit Notes <br /> Batch 1G20011 -EPA 5030B(PIT) <br /> Blank(1G20011-BLK2) Prepared&Analyzed 24-Jul-01 <br /> Methyl ten-butyl ether ND 20 ug/1 <br /> Surrogate Dibromofluoromethane 46 9 500 938 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 445 500 890 50-150 <br /> LCS(IG20011-BSS) Prepared &Analyzed 24-Jul-01 <br /> Methyl tent-butyl ether 50 1 20 ug/1 500 100 70-130 <br /> Surrogate Drbromofluoromethane 538 500 108 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 524 500 105 50-150 <br /> Matrix Spike(I G2001 1-MSI) Source W107223-04 Prepared&Analyzed 24-Jul-01 <br /> Methyl tert-butyl ether 479 20 ug/1 500 ND 95 8 60-150 <br /> Sgate Dibromofluoromethane 493 I' 500 986 50-150 <br /> ate 1 2-Dichloroethane-d4 467 500 934 50-150 <br /> ! Matrix Spike Dup(1G20011-MSDI) Source W107223-04 Prepared 24-Jul-01 Analyzed 25-Jul-01 <br /> 1 _ <br /> Uhvl tert-butyl ether 586 20 ug/1 500 ND 117 60-150 201 25 <br /> %arrogate Dibromofluoromethane 540 500 108 50-150 <br /> Surrogate 12-Dichloroethane-d4 520 500 104 50-150 <br /> �ota Analytical- Walnut Creek The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Thts analytical report must be reproduced to its entirety <br /> Page 8 of 9 <br />