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Sequoia 8i95tnto Ave Ste <br /> 8 <br /> Sacramento CA 99600 <br /> 'til Analytical <br /> (916)921 91;00 <br /> FAX equw421 01t)0 <br /> www sequoraiabs com <br /> Gettler-Ryan-Dublin Project Former Unocal 5098,Stockton,CA S302592 <br /> 6747 Sierra Covet,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L. Harding 03/10/03 17 17 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reportuig <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-14 5302592-10 Water Sampled 02/18/0315 05 Received 02/24/03 15 30 <br /> Benzene ND 0 50 ug/l I 3020415 02/28/03 02/28/03 EPA 826013 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 0 <br /> Surrogate 1,2-DCA-d4 94% 60-140 " <br /> Surrogate Toluene-d8 108% 60-140 " <br /> Surrogate 4-BFB 106% 60-140 <br /> MW-10A (S302592-11)Water Sampled 02/18/03 15 30 Received 02/24/03 15 30 <br /> Benzene ND 050 ug/1 I 3020415 02/28/03 02/28/03 EPA 8260B <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl ter/-butyl ether ND 20 <br /> Sur rogate 12-DCA-d4 96% 60-140 " WE <br /> Surrogate Toluene-d8 109% 60-140 - <br /> Surrogate 4-BFB 108% 60-140 " <br /> MW-11 (5302592-12)Water Sampled 02/21/03 14 10 Received 02/24/03 15 30 <br /> Benzene 300 10=ug/1 20 3030088=03106103=03105103=EPA-8260B <br /> Toluene 17 10 " <br /> —Ethylbenzene -- - - - - --28—=— --30 <br /> Xylenes(total) ND 10 " <br /> Methyl tert-butyl ether- -- - _-- -ND- - ---- 40T --- <br /> Sui r ogaie 1,2-DCA-d4 119% 60-140 <br /> Suri ogaie Toluene-d8 116% 60-140 " <br /> Surrogate 4=BFB _ _ _ _,_ - 101 %" 60-140 <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accoi dance with fire chain of <br /> custody document Unless otherwise stated results are reported on a wet werght basis ' <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 126 <br />