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1455 McDowell Blvd Worth Ste 17 <br /> Sequoia Petaluma CA 94954 <br /> ID (707)792-1865 <br /> Analytical FAX(707)7www se9uoialabs om <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P412386 <br /> 2$70 Gateway yaks Drive Suite 300 <br /> Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/11/05 08 02 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Litnu Units Dilution Batch Prepared Analyzed Method Note <br /> VW-3(P412386-06)Water Sampled 12/21/04 06 46 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 100 ugll 100 5010022 01/04/05 01/04/05 EPA 8260B <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> 1,2-Dtchloroethane ND 50 <br /> Ethanol ND 10000 <br /> Ethylbenzene 650 50 <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 170 50 " <br /> Toluene 4800 50 " <br /> Xylenes(total) 10000 50 <br /> Surrogate Dtbromofluoromethane 94% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 89% 74-135 <br /> rrogate Toluene-d8 105% 84-119 <br /> rrogate 4-Bromofluorobenzene 105% 86-119 <br /> VW-3(P412386-06RE1)Water Sampled 12/21/04 06 46 Received 12/21/04 09 53 CL <br /> Benzene 5400 100 ug/l 200 5010096 01/07/05 01/07/05 EPA 8260E <br /> .Surrogate Dtbromofluoromethane 119% 84-122 <br /> Surrogate 12-Dtchloroethane-d4 112% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 <br /> VW-5(P412386-07)Water Sampled 12/21/04 05 05 Received 12/21/04 09 53 <br /> Tert-amyl methyl ether ND 10 ug/I 1 5010022 01/04/05 01/04/05 EPA 8260B <br /> Benzene 0 50 0 50 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) 0 53 050 <br /> Surrogate Dtbromofluoromethane 92% 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 92% 74-135 <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 8 of 15 <br />