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Ste 1) <br /> Sequoia 1455 McDowelletalluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/25/04 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method Note <br /> MW-8(P404694-09)Water Sampled 04/27/04 14 50 Received 04/29/04 12 20 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4050243 05/11/04 05/11/04 EPA 8260B <br /> Benzene ND 050 ^ <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " " " " <br /> Ethanol ND 100 ~ " <br /> Ethylbenzene ND 050 " ^ <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 2 4 050 ^ <br /> Toluene ND 050 ~ ^ <br /> Xylenes(total) ND 050 ^ <br /> Surrogate Dtbromofluoromethane 102% 84-122 " 11 " <br /> Surrogate 1,2-Drchloroethane-d4 101 % 74-135 " 11 " " <br /> Surrogate Toluene-d8 102% 84-119 " 11 " <br /> AMW-3(P404694-10)Water Sampled 04/27/04 15 10 Received 04/29/04 12 20 <br /> 'Wert-amyl methyl ether ND 10 ugtl 1 4050243 05/11/04 05/11/04 EPA 82608 <br /> Benzene ND 050 ~ " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 13 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 ~ <br /> Surrogate Dtbromofluoromethane 101 % 84-112 " <br /> Surrogate 1,1-Drchloroethane-d4 100% 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 of <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />