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1455 McDowell Blvd,North Ste D <br /> 4DSequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical% FAX(707)792-0342 <br /> www sequoralabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P310692 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/14/03 15 55 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Balch Prepared Analyzed Method Notes <br /> MW-8(P310692-11)Water Sampled 10/29/03 14 05 Received 10/31/03 10 30 <br /> Tert-amyl methyl ether ND 1 0 u8/1 1 3110188 11/11/03 11/11/03 EPA 8260E <br /> Benzene ND 050 11 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 <br /> Etbylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 1 7 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 104% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 95% 74-135 " <br /> IWrrogate Toluene-d8 110% 84-119 <br /> W4(P310692-12)Water Sampled 10/29/03 14 25 Received 10/3I/03 10 30 <br /> Tert-amyl methyl ether ND 2 0 ug/1 2 3110233 11/12/03 11/12/03 EPA 8260B <br /> Benzene 34 10 " " " " " " <br /> Tert-butyl alcohol ND 40 " <br /> Di-isopropyl ether ND 20 " <br /> Ethanol ND 200 " <br /> Ethylbenzene 5 5 1 0 " <br /> Ethyl lert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether 79 1 0 " <br /> Toluene ND 10 " <br /> Xylenes(total) ND 1 0 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 121% 84-119 S-04 <br /> �equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stared results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 10 of 22 <br />