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Sequoia I455 McDowell Blvd North Ste D <br /> � Petaluma CA 94954 <br /> a— ) (707)792-1865 <br /> IW Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> 10 <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P502088 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 02/16/05 16 54 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> [Analyte Result Limit Units Dilution Batch Prepared Analyzed Method riot <br /> MW-6(P502088-05)Water Sampled 01/31/05 15 25 Received 02/02/05 06 55 BH <br /> Tert-amyl methyl ether ND 50 ug/l 5 5020202 02/14/05 02/14/05 EPA 82608 <br /> Benzene 3 0 25 <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> Ethanol ND 500 <br /> Ethylbenzene 4 7 2 5 „ <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tert-butyl ether 5 2 2 5 <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 <br /> Surrogate Dibromofluoromethane 103% 84-122 ^ " <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 <br /> Surrogate Toluene-d8 112% 84-119 <br /> Surrogate 4-Bromofluorobenzene 116% 86-119 ~ <br /> -7(P502088-06)Water Sampled 01/31/0514 50 Received 02/02/05 06 55 <br /> Tert-amyl methyl ether ND 1 0 ug/] 1 5020202 02/14/05 02/14/05 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 „ <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND I00 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 20 050 " ~ <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 105% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 ~ " <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in 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 10 <br />