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a— ) (71455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> �r Analytical FAX <br /> 07)792-1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P401433 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/11/04 16 31 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1(P401433-07)Water Sampled 01/26/04 12 50 Received 01/27/0417 00 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4020142 02/05/04 02/06/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 " <br /> I <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromo luoromethane 100% 84-122 IF <br /> Surrogate 1,2-Dichloroethane-d4 103% 74-133 " <br /> Iurrogate Toluene-d8 100% 84-119 " <br /> W-2(P401433-08)Water Sampled 01/26/04 13 40 Received 01/27/04 17 00 <br /> Tert-amyl methyl ether ND 10 ug/i 1 4020142 02/05/04 02/06/04 EPA 8260B <br /> Benzene ND 050 11 " <br /> Tert-butyl alcohol 95 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 91 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 104% 84-122 " " " <br /> Surrogate 12-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 18 <br />