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a— ) (9Sinker Ave Ste S <br /> Sequoia Sacramento <br /> CA 95834 <br /> qW Analytical FAX <br /> 16)921 0100 <br /> (9I6)921-0 t 00 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA 5304255 <br /> 3017 Kilgore Road,Suite 100 Protect Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 041291110112 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B -Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3040335-EPA 5030B[PIT] <br /> Matrix Spike 3040335-MSI) Source 5304294-02 Prepared 04/21/03 Analyzed 04/22/03 <br /> Surrogate 4-BFB 25 1 u9/1 25 0 100 60-140 <br /> Matrix Spike Du 3040335-MSD1 Source 5304294-02 Prepared 04/21/03 Analyzed 04/22/03 <br /> Benzene 162 0 50 up/l 13 6 ND 119 70-130 6 25 <br /> Toluene 91 7 0 50 83 4 ND 110 70-130 10 25 <br /> Methyl tert-butyl ether 272 20 22 4 ND 121 60-140 10 25 <br /> Gasoline(C6-CIO) 1280 50 1100 63 111 60-140 2 25 <br /> Surrogate Toluene-d8 25 6 250 102 60-140 <br /> Surrogate 4-BFB 255 250 102 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated, results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 15 of 19 <br />