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�9 <br /> 1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11191, Stockton,Ca P401434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project 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 Lirmt Umts Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P401434-03)Water Sampled 01/26/04 12 20 Received 01/27/04 17 00 <br /> Tert-amyl methyl ether ND 500 u@/1 500 4020169 02/07/04 02/07/04 EPA 8260E <br /> Benzene ND 250 <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tert-butyl ether 17000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromethane 100% 84-112 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> -MW4(P401434-04)Water Sampled 01/26/04 11 40 Received 01/27/04 17 00 __- <br /> Tert-amyl methyl ether ND 500 ug/l 500 4020169 02/07/04 02/07/04 EPA 8260B <br /> Benzene ND 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene ND 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tert-butyl ether 22000 250 " <br /> Toluene ND 250 " <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromethane 100% 84-112 " <br /> Surrogate 12-Dachloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 14 <br />