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(D (70Sequoia <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> � Analytical <br /> 7)792-1865 <br /> FAX(707)792-0342 <br /> 0 www sequotalabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P308015 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/03 17 10 <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 /> AMW-6(P308015-05)Water Sampled 07/30/03 12 10 Received 07/31/03 14 40 <br /> Tert-amyl methyl ether ND 50 ugll 5 3080111 08/07/03 08/07/03 EPA 8260B <br /> Benzene 16 25 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 50 " <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tent-butyl ether ND 50 " <br /> Methyl tert-butyl ether 16 25 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 109% 74-135 " <br /> rrogate Toluene-d8 106% 84-119 " <br /> rrol;ale 4-Bromofluorobenzene 102% 86-119 <br /> MW-1(P308015-06)Water Sampled 07/30/03 11 30 Received 07/31/03 14 40 <br /> Tert-amyl methyl ether ND 10 ugn 1 3080111 08/07/03 08/07/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 109% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " <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 stated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page 7 of 21 <br />