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404 N Wiget Lane <br /> 4D Sequoia walnut Creek,CA 94598 <br /> (925)988-9600 <br /> 'w Analytical FAX(925)988-%73 <br /> www sequaialabs can <br /> Gettler Ryan,Inc -Dublin Project Tosco W208192 <br /> 6747 Sierra Court Suite J Project Number Tosco 0 11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-02 1252 <br /> :: <br /> GasolinelBTEXIUxygenates 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 JP/Tl _ __— - w - <br /> Blank(2080122-BLKI) Prepared&Analyzed 14-Aug-02 <br /> Benzene ND 050 US/I <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 12-DCII-d4 243 250 97 60-140 <br /> Surrogate Toluene-d8 264 15 0 106 60-140 <br /> Surrogate 4-BFB 259 250 104 60-140 <br /> Laboratory Control Sample(2080122-BS1) _ Prepared&Analyzed 14-Aug-02 <br /> Benzene 141 050 USA 134 105 70-130 <br /> Toluene 819 050 81 0 101 74-130 <br /> Methyl tert-butyl ether 23 5 050 21 8 108 60-140 <br /> Gasoline(C6-C10) 993 50 1100 90 70-130 <br /> Surrogate 12-DCA-d4 242 250 97 60-140 <br /> Surrogate Toluene-d8 264 25 0 106 60-140 <br /> Surrogate 4-BFB 255 15 0 101 60-140 <br /> Matrix Spike(2080122-MSI) Source W208192-04 Prepared&Analyzed 14-Aug-02 <br /> Benzene 144 050 ug/1 13 4 ND 107 70-130 <br /> Toluene 868 050 81 0 ND 107 70-130 <br /> Methyl tert-butyl ether 271 050 21 8 NR 60-140 QM-4X <br /> Gasoline(C6-C10) _ 1240 _ 50 1100 220 93 60-140 <br /> Surrogate 1 1-DCA-d4 233 15 0 93 60-140 <br /> Surrogate Toluene-d8____ _ __ _ _ _ __270 _ 250 108 _60-140 - - <br /> Surrogate 4-BFB 265 25 0 106 60-140 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain <br /> custody documeni Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 15 of 17 <br />