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(D • 1455 McDowell FAX ell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-0362 <br /> (707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P310466 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 16 09 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lirrut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P310466r05)Water Sampled 10/17/03 11 10 Received 10/20/03 09 30 <br /> Tert-amyl methyl ether ND 100 u8A 100 3100778 10/30/03 10/30/03 EPA 8260E <br /> Benzene ND 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tent-butyl ether 3600 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dibrom ofluorom ethane 112% 84-I22 " <br /> Surrogate 1,2-Dichloroethane-d4 129% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> +114W-6(P310466-06)Water Sampled 10/17/03 12 45 Received 10/20/03 09 30 <br /> 'Tent-amyl methyl ether ND 1 0 ug/1 1 3100778 10/30/03 10/30/03 EPA 8260B <br /> Benzene ND 0 50 " <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 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromeihane 107% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 128% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed to 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 6 of 14 <br />