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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 9 <br /> •' a— ) 4954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <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 /> Repotting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> AMW-6(P502088-03)Water Sampled 01/31/05 15 10 Received 02/02/05 06 55 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5020202 02/14/05 02/14/05 EPA 8260E <br /> Benzene ND 050 " <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 10 <br /> Methyl tert-butyl ether 1 7 050 <br /> Toluene ND 050 <br /> Xylenes(total) 061 050 <br /> Surrogate Dibromofluoromethane 105% 84-122 <br /> Surrogate 12-Dichloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 102% 84-119 <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 <br /> �VIW-4(P5020$$-04)Water Sampled 01/31/05 15 10 Received 02/02/05 06 55 <br /> Tert-amyl methyl ether ND 1 0 ugfl 1 5020202 02/14/05 02/14/05 EPA 8260B <br /> Benzene 075 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 <br /> Ethylbenzene 2 9 050 " » <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 35 050 <br /> Toluene ND 050 " <br /> Xylenes(total) 058 050 ^ <br /> Surrogate Dibromofluoromethane 107% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 112% 74-135 " <br /> Surrogate Toluene-d8 108% 84419 <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <br /> Sequoia Analytical-Petaluma The results in 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 5 of 10 <br />