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1455 McDowell Blvd,North Ste D <br /> 4D Sequoia Petaluma,CA 94954 <br /> Analytical FAX(707707)792-1865 <br /> 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 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05125104 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Now <br /> MW-2(P404694-11)Water Sampled 04/28/04 08 48 Received 04/29/04 12 20 <br /> Tert-amyl methyl ether ND 1 0 ugfl 1 4050263 05/11/04 05/12/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Do-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl ted-butyl ether ND 050 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 ^ ^ <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 118% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> AolkMW-4(P404694-12)Water Sampled 04/28/04 09 11 Received 04129104 12 20 <br /> ert-amyl methyl ether ND 1 0 ugll 1 4050263 05111/04 05/12/04 EPA 82608 <br /> Benzene ND 050 ^ " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 84 0 50 ^ " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 ^ <br /> Surrogate Drbromofluoromethane 105% 84-121 " <br /> Surrogate 12-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 106% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed rn accordance with the churn 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 10 of 21 <br />