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404 N WWt Lane <br /> 4D Sequoia Walnut Creek,CA 94598 <br /> (925)988-96M <br /> 1W Analytical FAX(925)988-9673 <br /> www sequoialabs can <br /> ttler Ryan,Inc -Dublin Project Tosco W208192 <br /> 47 Sierra Court Suite J Project Number Tosco# 11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-02 12 52 <br /> Gasoline\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 2080122-EPA 5030B PIT <br /> Matrix Spike Dup(2080122-MSD1) Source W208192-04 Prepared&Analyzed 14-Aug-02 <br /> Benzene 144 050 ug/i 13 4 ND 107 70-130 0 25 <br /> Toluene 874 050 810 ND 108 70-130 0 7 25 <br /> Methyl tert-butyl ether 272 050 218 NR 60-140 0 4 25 QM-4X <br /> Gasoline(C6-C 10) 1240 50 1100 220 93 60-140 0 25 <br /> Surrogate 1,2-DC4-d4 224 250 90 60-140 <br /> Surrogate Toluene-d8 269 250 108 60-140 <br /> Surrogate 4-BFB 268 25 0 107 60-140 <br /> is Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 16 of 17 <br />