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6) (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 7)792 1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36365 tteported <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 Irmut Units Dilution Batch Prepared Analyzed Method Note <br /> AMW-1 (P404694-01)Water Sampled 04/27/04 12 05 Received 04/29/04 12 20 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4050243 05/11/04 05/11/04 EPA 9260B <br /> Benzene ND 050 " <br /> Ted-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 ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> AmaiiAMW-2(P404694-02)Water Sampled 04/27/04 12 30 Received 04/29/04 12 20 <br /> 'Wert-amyl methyl ether ND 1 0 ug/l 1 4050243 05/11/04 05/11/04 EPA 8260E <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 ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 102% 84-122 " <br /> Surrogate 12-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 5 of 21 <br />