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Sequoia 1455 McDowPeBlvd <br /> luma CA 949544 <br /> 4D (707)792-1865 <br /> qW Analytical FAX(707)792 0342 <br /> WWW sequoialabs com <br /> db <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Lunit Units Dilution Batch Prepared Analyzed Method Notes <br /> B39-135(P402493-10)Soil Sampled 02/18/04 11 40 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4020565 02/25/04 02/26/04 EPA 8260E <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dtbromoethane(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 tert-butyl ether ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluoromethane 110% 81-126 <br /> 10rogate 12-Dichloroethane-d4 103% 73-131 <br /> rogate Toluene-d8 101 % 82-129 <br /> B39-145(P402493-11)Sod Sampled 02/18/04 12 08 Received 02/19/0410 00 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4020565 02/25/04 02/26/04 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dtbromoethane(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 tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluoromethane 117% 81-126 " <br /> Surrogate 12-Dichloroethane-d4 109% 73-131 " <br /> Surrogate Toluene-d8 104% 82-129 <br /> 0uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated, results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 11 of 25 <br />