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819 StrikerAve Ste 8 <br /> IXNSequoia Sacramento, <br /> CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)9210100 <br /> www sequoialabs corn <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA 5412468 <br />' 1575 Treat Blvd,Ste 212 Project Number NIA Reported <br /> Walnut Creek CA,94596 Project Manager Michelle Zehr 01/04/05 13 32 <br /> GasolinelBTEXIOxygenates by EPA method 8260B <br />' Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br />' H-'LANK(S412468-03)Water Sampled 12/16/04 12 35 Received 12/17/04 14 00 <br /> Ethanol ND 50 ugA 1 4120407 12/30/04 12/30/04 EPA 8260B <br />' Tert-butyl alcohol ND 50 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether Nil 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 ND 050 <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> asohne Range Organics(C4-C12) ND 50 " <br /> arrogate 12-DCA-d4 87% 60-140 " <br /> Surrogate Toluene-d8 95% 60-140 " <br /> Surrogate 4-BFB 94% 60-140 " <br /> 1 <br /> 1 <br />' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 7 of 12 <br />