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S 19 Sinker Ave Ste 8 <br /> Sequoia Secram(916)92195834 9600 <br /> rAX -o i0o <br /> Analytical wwse uoiala16)92 scum <br /> www sequoialabs cam <br /> Gettler-Ryan-Dublin Project Former Unocal 5098,Stockton,CA S302592 <br /> 6747 Sierra Court,Ste 3 Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 03/10/03 17 17I <br /> GasollneWEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-4 S302592-04 Water Sampled 02/21/03 13 30 Received 02124/03 15 30 <br /> Benzene 180 50 ug11 10 3030088 03/06/03 03/06/03 EPA 9260B <br /> Toluene 10 5 0 <br /> Ethylbenzene 26 5 0 " <br /> Xylenes(total) 75 5 0 " <br /> Methyl tert-butyl ether ND 20 <br /> Surrogate 1,2-DCA-d4 108% 60-140 " <br /> Surrogate Toluene-d8 113% 60-140 " <br /> Surrogate 4-BFB 100% 60-140 " <br /> MW-5 S302592-05 Water Sampled 02/18/03 13 35 Received 02/24/03 15 30 <br /> Benzene ND 0 50 UO 1 3020415 02/28/03 02/28/03 EPA 8260B <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 54 f� <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether - - ND -20 " <br /> Surrogate 1,2-DCA-d4 92% 60-140 " <br /> Surrogate Toluene-d8 113% 60-140 " <br /> Surrogate 4-BFB 122% 60-140 " <br /> - MW-6(5302591-0) Water aamplect 0212WO3 14 45 Receiven 62/24163 15 30 <br /> Benzene 150 0 50Tug/1 1 3030088-03/06/03-03/06/03—EPA 8260B -_ <br /> Toluene 61 0 50 " <br /> =Ethylbenzene---- - -- 4 1— 0 50 <br /> - Xylenes(total) 24 0 50 " <br /> Methyl tert=butyl ether--- -- - _-- -ND---- - 2 0 --- - ---- - - -"- "---= ---- - - -- - - - <br /> Surrogate 1,2-DCA-d4 107% 60-140 <br /> Surrogate Toluene-d8 112% 60-140 " <br /> ---Surrogate 4-BFB'- - - - - 105% ---60-140 <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of lip <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its enitrety <br /> Page 10 of 126 <br />