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` 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,C 94954 <br /> (707)799 2-1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> www seAuoialahs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404510 <br /> 2970 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/05/04 18 51 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> 1341-134(P404510-11)Sod Sampled 04/20/04 12 40 Received 04/21/04 11 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 404075t 04/29/04 04/29/04 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tent-butyl ether ND 00050 <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluoromethane 110% 81-126 " <br /> Surrogate 12-Dtchloroethane-d4 109% 73-131 " <br /> ogate Toluene-d8 102% 82-129 <br /> oia 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 10 of 17 <br />