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819 Striker Ave Ste 8 <br /> KI) Sequoia .5'acru mento,CA 95834 <br /> Analytical FAX(916)921-9600 <br /> (916)92!.01 DO <br /> www sequomalabs mm <br /> Gettler-Ryan-Dublin Project Unocal 5098, Stockton, CA 5210010 <br /> 6747 Sierra Court,Ste J Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 10/14/02 18 46 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method ?dotes <br /> MW-7(S210010-08)Water Sampled 09/24/02 14 43 Received_ 09/26/02.1.8 35 <br /> Tert-butyl alcohol ND 50 ug/t 1 2100088 10/05/02 10/06/02 EPA 8260E <br /> Methyl tent-butyl ether ND 050 " - <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene 3 4 050 " <br /> Ethylbenzene 2 9 050 <br /> Toluene 2 3 050 " <br /> Xylenes(total) 11 050Q-19 <br /> 19 <br /> Surrogate Toluene-d8 115% 60-140 " <br /> Surrogate 4-BFB 116% 60-140 11 <br /> " <br /> Surrogate 1,2-DCA-d4 109% 60-140 " <br /> MW-8D (S210010-09)Water Sampled 09/23/02 18 09 Received 09/26/02 18 35 <br /> Tert-butyl alcohol ND 250 ug/l 50 21000SS 10/05/02 10/05/02 EPA 8260B <br /> Meshy]tert-butyl ether ND 25 " <br /> Di-isopropyl ether ND 25 <br /> Fthvl tent-butyl ether ND 25 " <br /> Tert-amyl methyl ether ND 25 " <br /> �--1;2=Dichloroethane <br /> 1,2-Dibromoethane(EDB) ND 25 <br /> =Benzene-- -- --- -- --- --84 --25-- - -- - — --„-- ---- -- -- --.,- -- - „- --- -- - —� <br /> Ethylbenzene 38 25 ” <br /> Toluene ----- -- --- -- -- - -- - -- 33--------25 <br /> Xylenes(total) 110 25 r <br /> Surrogate Toluene_-d8 113% � _60-1_4_0 <br /> Surrogate 4-BFB 109% 60-140 " <br /> Surrogate 1,2-DCA-d4 110% 60`140 <br /> r <br /> r <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain or <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical t eporl must be reproduced in its entirety <br /> Page 13 of 119 <br /> r <br />