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Sinker Ave Ste <br /> 8 <br /> 2amento, 92 956 <br /> Sequoia Sacr00 <br /> FAX <br /> Analytical (916)92] 9600 <br /> (916)92 I-0100 <br /> www sequoialabs cum <br /> 5 <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 1141 <br /> Gasoline\BTEMOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-24S (5210010-32)Water Sampled 09/22/021951 Received 09/26/021835 <br /> Tert-butyl alcohol ND 500 ug/l 100 2100083 10/04/02 10/05/02 EPA 8260B <br /> Methyl tert-butyl ether - ND 50 <br /> Di-isopropyl ether ND 50 <br /> Ethyl tert-butyl ether ND 50 " <br /> 'Pert-amyl tnethy!ether ND 50 <br /> 1,2-Dichloroethane TSD 50 " <br /> 1,2-Dtbrornoethane(EDB) ND 50 <br /> Benzene 1100 50 " <br /> Ethylbenzene 250 50 <br /> Toluene 94 50 <br /> Xylenes(total) 120 50 <br /> Surrogate Toluene-d8 114% 60-140 " <br /> Surrogate 4-BFB - 107% 60-140 " <br /> Surrogate 1 2-DCA-d4 104% 60-140 " <br /> MW-25D 5210010-33 Water Sampled 09/23/02 16 52 Received 09/26/02 18 35 <br /> Tert-butyl alcohol 38 25 ug/I 5 2100085 10/05/02 10/05/02 EPA 8260B <br /> Methyl tert-butyl ether ND 2 5 <br /> Di-isopropyl ether ND 25 <br /> Ethyl tort-butyl ether ND 25 <br /> Tert-amyl methyl ether ND 25 " �t <br /> =1;2=Dichloroethane ND 2 - <br /> 1,2-Dibromoethane(EDB) ND 2 5 <br /> Benzene -- ---- -- - -- - --ND- - -2 5- -- - -- -- --- - --—- „ - <br /> Ethylbenzene ND 25 <br /> -- Toluene - - ------� - - - - -=-6 8------ -25 - --, -— , ----- -- - „- „ - - <br /> Xylenes(total) 47 25 <br /> Surrogate Toluene-d8 10.5% 60-140 " <br /> Surrogate 4-BFB - Y" -- <br /> 80%-- 60-190 <br /> Surrogate 1,2-DCA-d4 _ 106% - 60-140 <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its enurety <br /> Page 25 of 119 ' <br />