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404 N Wlget Lane <br /> Sequoia T Walnut Creek CA 94598 <br /> (925)98&9600 <br /> m,ff Analytical - FAX(925)alabs casxL <br /> 73 <br /> www sequoilabs <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> -6747 Sierra Court-Suite-J PmJect Number-Chevron 9-6171 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 13-Jun-01 09 09 <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 Limits _Notes <br /> Batch 1F05014-EPA 5030B(PIT) " <br /> Blank(1F05014-BLK1) Prepared 05-Jun-01 Analyzed 07-Jun-01 <br /> Methyl tett-butyl ether ND 20 ug/1 <br /> Surrogate Dibromofluoromethane 448 " 500 896 50-150 <br /> Surrogate 1 1-Dtehloroethane-d4 469 500 938 50-150 <br /> LCS(11~'05014-BSI) Prepared 05-Jun-01 Analyzed 07-Jun-01 <br /> Methyl tert-butyl ether 424 20 ug/I 500 848 70-130 <br /> Surrogate Dibromofluoromethane 449 500 898 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 461 500 922 50-150 <br /> LCS(1F05014-BS2) Prepared&Analyzed 06-Jun-01 <br /> Methyl tert-butyl ether 394 20 ug/l 500 788 70-130 <br /> Surrogate Dibromofluoromethane 489 500 978 50-150 . <br /> Surrogate 12-Dichloroethane-d4 477 500 954 50-150 <br /> Matrix Spike(IF'05014-MSI) Source W106011-15 Prepared 05-Jun-01 Analyzed 06-Jun-01 <br /> Methyl tett-butyl ether 413 20 ug/l 500 ND 826 60-150 <br /> Surrogate Dibromofluoromethane 485 Soo 970 50-150 <br /> Surrogate"12-Dichloroethane-d4 485 500 970 50-150 <br /> Matnx Spice Dup(IF05014-MSD1) -- - ----Source W106011-15-- - Prepared 05=Jun-01 Analyzed 06-Jun-01--- <br /> Methyl tert-butyl ether 466 20 ug/l 500 ND 932 60-150 121 25 <br /> Surrogate Dibromofluoromethane 470 Soo 940 50-150 <br /> Surrogate 1 2 Dichloroethane-d4 475 500 950 50-150 <br /> I <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the ch <br /> custody document This analytical repon must be reproduced to its enttr <br /> Page 8 of 9 <br />