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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (707)792-1865 <br /> r� 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 Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> B39-88(P402493-05RE1)Soil Sampled 02/17/04 16 15 Received 02/19/04 10 00 HT-05 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4030433 03/16/04 03/16/04 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 010 " <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 tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Drbromofluoromethane 108% 81-126 " <br /> Irrogate 12-Drchloroethane-d4 106% 73-131 <br /> ogate Toluene-d8 116% 82-129 " <br /> B39-95(P402493-06)Soil Sampled 02/17/04 17 20 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4020565 02/25/04 02/25/04 EPA 8260B <br /> Tert-butyl alcohol ND 010 " <br /> Dr-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 <br /> 1,2-Drchloroethane 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 0 010 00050 <br /> Xylenes(total) 011 00050 <br /> Surrogate Dibromofluoromethane 108% 81-126 " <br /> Surrogate 1,2-Dichloroethane-d4 101 % 73-131 <br /> Surrogate Toluene-d8 100% 82-129 <br /> �uoia 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 8 of 25 <br />