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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1865 <br /> Analytical FAX(7117)792-0342 <br /> www sequoialabs com <br /> • <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive 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 Batch Prepared Analyzed Method Now <br /> AMW-6(P404694-05)Water Sampled 04/27/04 13 20 Received 04/29/04 12 20 <br /> Tert-amyl methyl ether ND 1 0 ug/I I 4050243 05/11/04 05/11/04 EPA 8260B <br /> Benzene ND 050 " <br /> Ten-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 093 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 4 3 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> AMW-5(P404694-06)Water Sampled 04/27/04 13 45 Received 04/29/04 12 20 <br /> ert-amyl methyl ether ND 1 0 ug/I 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 1 1 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 103% 74-135 <br /> Surrogate Toluene-d8 99% 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 7 of 21 <br />