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1455 McDowell Blvd North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Project-Bl?Heritage Site 11191,Stockton,Ca P410091 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/04 15 22 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Lund Units Dilution Batch Prepared Analyzed Method Note <br /> MW-3(P410091-03)Water Sampled 10/04/04 14 10 Received 10/05/04 18 00 <br /> Tert-amyl methyl ether ND 100 ug/l 100 4100304 10/13/04 10/13/04 EPA 8260B <br /> Benzene ND 50 " <br /> Tert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl Cert-butyl ether 2700 50 <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> •MW-4(P410091-04)Water Sampled 10/04/04 12 30 Received 10/05/04 18 00 <br /> Tert-amyl methyl ether ND 500 ug/l 500 4100304 10/13/04 10/14/04 EPA 82608 <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 ter(-butyl ether 17000 250 " <br /> Toluene ND 250 <br /> Xylenes(total) ND 250 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report musr be reproduced in its entirety <br /> Page 5of12 <br />