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' 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> ` [�Vl� ■� (707)792 1865 <br /> FAX(707)792 0342 <br /> Analytical www sequotalabs corn <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 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 /> B41-84(P404510-05)Soil Sampled 04/19/04 16 15 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 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 tert-butyl ether ND 00050 <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 <br /> Surrogate Dibromofluoromethane 107% 81-126 11 "' "' <br /> Surrogate 1 2-Dtchloroethane-d4 106% 73-131 " " 11 "' <br /> 0 ogate Toluene-d8 102% 82-129 " " <br /> 97(P404510-06)Soil Sampled 04/20/04 09 53 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 0 034 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 /> Ethanal ND 0 20 " <br /> Ethylbenzene ND 00050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl Cert-butyl ether ND 00050 " <br /> Toluene 00054 00050 " <br /> Xylenes(total) 0 023 00050 11 " " <br /> Surrogate Dibromofluoromethane 109% 81-126 <br /> Surrogate 1,2-Dtchloroethane-d4 108% 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 7 of 17 <br />