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Sequoia 1455 McDowel I Blvd Horth Ste D <br /> Petaluma CA 94954 <br /> (707)792 1865 <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 /> B42-41 (P404555-01)Soil Sampled 04/21/04 09 47 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4050019 05/03/04 05/03/04 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 tort-butyl ether ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 <br /> Surrogate DibromoJluoromethanc 98% 81-126 " <br /> Surrogate 12-Dichloroethane-d4 97% 73-131 II +11 <br /> , <br /> Surrogate Toluenc-d8 101 % 82-129 <br /> B42-54(P404555-02)Soil Sampled 04/21/04 10 30 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4050019 05/03/04 05/03/04 EPA 8260B <br /> Benzene 0 064 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 00080 00050 <br /> Ethyl tert-butyl ether ND 00050 <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene 0088 00050 <br /> Xylenes(total) 0 053 00050 " <br /> Surrogate DibromaJluoromethane 97% 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 97% 73-131 <br /> Surrogate Toluene-d8 99% 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 5 of 18 <br />