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1551 Industrial Raad <br /> Sequoia San Carlos 0 <br /> (b50)23 23 2-96-96 40 <br /> FAX., 12 <br /> Analytical wwseg0ialabs o <br /> www sequoialabs coin <br /> r-Ryan/Geostrategies(l) Protect Tosco(1) <br /> Sierra Court,Suite J Protect Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Protect Manager Deanna Harding 05/21/02 13 26 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3 !.205023-04 Water Sampled 05/06/02 13 05 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) 14 050 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 1,2-DCA-d4 107% 60-140 " <br /> Surrogate Toluene-d8 95 % 60-140 " <br /> Surrogate 4-BFB 91 % 60-140 " <br /> MW-4 L205023-05Water Sampled 05/06/02 14 10 Received 05/06/02 17 05 R-05 <br /> Benzene ND 10 ug/1 20 2050122 05/15/02 05/16/02 EPA 8260B <br /> Toluene ND 10 " <br /> Ethylbenzene ND 10 " <br /> Xylenes(total) ND 10 " <br /> Gasoline(C6-C10) 1200 1000 " <br /> 1,1-DCA-d4 99% 60-140*ate <br /> ate Toluene-d8 100% 60-140 " <br /> Surrogate 4-BFB 98 % 60-140 " <br /> MW-5 (L205023-06)Water Sampled 05/06/02 11 50 Received 05/06/02 17.05 <br /> Benzene ND 0 50 ugll 1 2050109 05/10/02 05/11/02 EPA 8260B <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) 10 050 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate 1,2-DCA-d4 104 % 60-140 " <br /> Surrogate Toluene-d8 92 % 60-140 " <br /> Surrogate 4-BFB 81 % 60-140 " <br /> to Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 6 of 13 <br />