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• 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> IZ){ (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404510 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/05/04 18 5 t <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 /> B41-57(P404510-03)Soil Sampled 04/19/04 13 47 Received 04/21/04 11 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040751 04/29/04 04/29/04 EPA 8260B <br /> Benzene 0 028 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 tert-butyl ether ND 00050 <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluoromethane 102% 81-126 <br /> Surrogate 12-Dichloroethane-d4 105% 73-131 <br /> 01 ogate Toluene-d8 100% 82-129 <br /> -69(P404510-04)Soil Sampled 04/19/04 14 35 Received 04/21/04 11 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040751 04/29/04 04/29/04 EPA 8260E <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 tett-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibromofluoromethane 105% 81-126 " <br /> Surrogate 1,2-Dichloroethane-d4 104% 73-131 " <br /> Surrogate Toluene-d8 103% 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 6 of 17 <br />