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(D (92404 N Wiget Lane <br /> Sequoia Walnut Geek,CA 94599 <br /> ' Analytical <br /> 5)988-9600 <br /> FAX(425)988-9673 <br /> www wquoialabs cam <br /> Gettler Ryan,Inc -Dublin Project Tosco W208192 <br /> 6747 Sierra Court Suite J Project Number Tosco#11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-02 12 52 <br /> Gasohne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result , Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> (QA(W208192-01)Water Sampled 08-Aug-020000 Received 09-Aug-02 16 15 <br /> Benzene ND 050 urA 1 2080122 14-Aug-02 14-Aug-02 EPA 82608 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 1,2-DCA-d4 96% 60-140 " <br /> Surrogate Toluene-d8 108% 60-140 " <br /> Surrogate 4-BFB 102% 60-140 " <br /> MW-1 (W208192-02)Water Sampled 08-Aug-02 15 15 Received 09-Aug-02 16 15 - <br /> Benzene ND 050 ug/l 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 101 % 60-140 " <br /> Surrogate Toluene-d8 109% 60-140 " <br /> Surrogate 4-BFB 105% 60-140 " <br /> MW-3(W208192-03)Water Sampled 08-Aug-02 16 50 Received 09-Aug-02 16 15 R-05 <br /> Benzene ND 25 uFA 50 2080122 14-Aug-02 14-Aug-02 EPA 82608 <br /> Toluene ND 25 " <br /> Ethylbenzene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Gasoline(C6-C10) ND 2500 " <br /> Surrogate 1,2-DCA-d4 104% 60-140 " <br /> Surrogate Toluene-d8 108% 60-140 <br /> Surrogate 4-BFB 101 % 60-140 " <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain <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 /> 7 of 17 <br />