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1551 Industrial Road <br /> ti) <br /> Sequoia San Carlos CA 94070 <br /> iw Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www sequatalabs cam <br /> Gettler-Ryan/GeostrateRies(1) Project Tosco(1) <br /> 6747 Sterra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02 13 26 <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-6(L205023-07)Water Sampled 05/06/02 12 30 Received 05/06/02 17 05 <br /> Benzene ND 050 ug/l 1 2050109 05/10/02 05/11/02 EPA 8260B <br /> Toluene ND 050 <br /> Ethylbenzene -ND-0 50 <br /> Xylenes(total) 087 050 " <br /> Gasoline(C6-C10) ND 50 <br /> Surrogate 1,1-DCA-d4 110% 60-140 <br /> Surrogate Toluene-d8 101 % 60-140 " <br /> Surrogate 4-BFB 104% 60-140 <br /> MW-7(L205023-08)Water Sampled 05/06/02 11 00 Received 05/06/02 17 05 <br /> Benzene ND 050 ug/l 1 2050109 05/10/02 05/11/02 EPA 8260B <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) 0 74 050 <br /> Gasoline(C6-C 10) ND 50 " <br /> Surrogate 1,1-DCA-d4 107% 60-140 " " " • <br /> Surrogate Toluene-d8 96% 60-140 <br /> Surrogate 4-BFB 108% 60-140 <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chairs <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 13 <br />