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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs cum <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 IS 51 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Notes <br /> B41-37(P404510-01)Soil Sampled 04/19/04 12 24 Received 04/21/04 11 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040616 04/24/04 04/24/04 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 Dibromofluoromethane 103% 81-126 <br /> Surrogate 1 2-Dtchloroethane-d4 100% 73-131 " <br /> W1agate Toluene-d8 106% 82-129 <br /> -49(P404510-02)Soil Sampled 04/19/04 13 00 Received 04/21/04 11 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040616 04/24/04 04/24/04 EPA 8260B <br /> Benzene 0 089 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 0 023 00050 " <br /> Xylenes(total) 0 032 00050 " <br /> Surrogate Dtbromofluoromethane 108% 81-126 <br /> Surrogate 1,2-Dichloroethane-d4 109% 73-131 " <br /> Surrogate Toluene-d8 111 % 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 5 of 17 <br />