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a— ) • 1455 McDowall lNNorth Ste D <br /> Sequola elaEuma,CA 94954 <br /> (707)792-1865 <br /> ► Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11191,Stockton,Ca P310466 <br /> 2870 Gateway Oaks Dnve 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 Limit Chits Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P310466-03)Water Sampled 10/17/03 12 35 Received 10/20/03 09 30 <br /> Tert-amyl methyl ether ND 1000 ug/I 1000 3100829 10/31!03 10/31/03 EPA 8260E <br /> Benzene ND 500 " <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1000 " <br /> Ethanol ND 100000 " <br /> Ethylbenzene ND 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether 25000 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 " <br /> Surrogate Dibromofluoromethane 111 % 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 119% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Ani-NW-4(P310466-04)Water Sampled 10/17/03 11 30 Received 10/20/03 09 30 <br /> 'IIIPFrert-amyl methyl ether ND 1000 ug/l 1000 3100778 10/30/03 10/30/03 EPA 8260B <br /> Benzene ND 500 " <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1000 " <br /> Ethanol ND 100000 " <br /> Ethylbenzene ND 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl test-butyl ether 37000 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 " <br /> Surrogate Dibromofluoromethane 116% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 131 % 74-135 " <br /> Surrogate Toluene-d8 100% 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 14 <br />