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C—i)- <br /> 1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> NwAnalytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09J.Z-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Note <br /> MW-13(P503196-05)Water Sampled 03/15/05 06 37 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 10 ug/l 10 5030210 03/21/05 03/21/05 EPA 8260B <br /> Benzene 69 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 5 0 " <br /> 1,2-Dichloroethane ND so " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND so " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) 54 5 0 " <br /> Surrogate Dtbromofluoromethane 92% 84-122 <br /> � <br /> rrogate 12-Dichloroethane-d4 92% 74-135 <br /> rrogate Toluene-d8 96% 84-119 <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> VW-2(P503196-06)Water Sampled 03/15/05 06 00 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 250 ug/l 250 5030210 03/21/05 03/21/05 EPA 82608 <br /> Benzene 1600 120 " <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroethane ND 120 " <br /> Ethanol ND 25000 " <br /> Ethylbenzene 1200 120 " <br /> Ethyl tert-butyl ether ND 250 " <br /> Methyl tert-butyl ether ND 120 " <br /> Toluene 6000 120 " <br /> Xylenes(total) 3700 120 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " " <br /> 11 <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 7 of 18 <br />