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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 4:D (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P401434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 02/11/04 16 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 /> MW-5(P401434-05)Water Sampled 01/26/04 10 50 Received 01/27/04 17 00 <br /> Tert-amyl methyl ether ND 200 ug/1 200 4020167 02/06/04 02/07/04 EPA 82608 <br /> Benzene ND 100 " <br /> Tert-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 " <br /> Ethanol ND 20000 " <br /> Ethylbenzene ND 100 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether 4300 100 " <br /> Toluene ND 100 " <br /> Xylenes(total) ND 100 " <br /> Surrogate Dibromofluoromethane 104% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 <br /> AIILMW-6(P401434-06)Water Sampled 01/26/04 12 35 Received 01/27/04 17 00 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4020169 02/07/04 02/07/04 EPA 826013 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <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 96% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 94% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 " <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> Analytical-Petaluma p ppY p Y,Sequoia <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 6 of 14 <br />