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404 N Wigm Lane <br /> 4D Sequoia WalnutGr=k,CA 94598 <br /> (925)988-9600 <br /> qW Analytical FAX(925)988-9673 <br /> www sequoialabs cam <br /> ettler Ryan,Inc -Dublin Project Tosco W208192 <br /> 47 Sierra Court Suite J Project Number Tosco 4 11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-02 12 52 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-10 208192-10 Water Sampled 08-Au -02 11 20 Received 09-Aug-02 16 15 <br /> Benzene ND 050 ugA 1 2080122 14-Aug-02 14-Aug-02 EPA 8260B <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline(C6-C10) ND 50 <br /> Surrogate 1,2-DCA-d4 103% 60-140 " <br /> Surrogate Toluene-d8 109% 60-140 " <br /> Surrogate 4-BFB 101% 60-140 " <br /> MW-11 (W208192-11)Water Sampled 08-Aug-02 13 45 Received 09-Aug-02 16 15 <br /> Benzene ND 25 ug/1 50 2080122 14-Aug-02 14-Aug-02 EPA 8260B r <br /> Toluene ND 25 " <br /> Ethylbenzene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Gasoline(C6-C10) ND 2500 " <br /> ragate 1,2-DCA-d4 102% 60-140 <br /> agate Toluene-d8 110% 60-140 " <br /> urrogate 4-BFB 102% 60-140 " <br /> �ola Analytical-Walnut Creek The results to 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 /> 10 of 17 <br />