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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (707)792-t 865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <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 /> B42-98(P404555-06REI)Soil Sampled 04/21/04 13 40 Received 04/23/04 11 50 <br /> Benzene 34 2 5 mg/kg 2500 4050095 05/05/04 05/05/04 EPA 8260E <br /> Ethylbenzene 17 25 " <br /> Toluene 37 25 " <br /> Xylenes(total) 100 25 " <br /> Surrogate Dibromoflitoromethane 89% 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 100% 73-131 <br /> Surrogate Toluene-d8 96% 82-129 <br /> B42-109(P404555-07)Soil Sampled 04/21/04 14 19 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4050057 05/04/04 05/04/04 EPA 8260B <br /> Benzene ND 00050 " <br /> Teri-butyl alcohol ND 030 <br /> Di-isopropyl ether ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " 11 <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 DibromoJluoronzethane 96% 81-126 <br /> Surrogate 1 2-Dtchloroethane-d4 91 % 73-131 " <br /> Surrogate Toluene-d8 100% 82-129 <br /> Sequoia 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 18 <br />