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(DSequoia 1455 McDowell Blvd North Ste D <br /> — Petaluma CA 94954 <br /> Analytical (707)792-1865 FAX 792-0342 <br /> www segUOLequoialabs coin <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 tlmts Dilution Batch Prepared Analyzed Method Notes <br /> B42-85(P404555-05)Sod Sampled 04/21/04 12 17 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4050019 05/03/04 05/03/04 EPA 82608 <br /> Benzene 00060 00050 " <br /> Tert-butyl alcohol ND 010 " <br /> Di-isopropyl ether ND 0 0050 <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 00072 00050 " <br /> Xylenes(total) 0 022 00050 " <br /> Surrogate Dibromoluoromethane 99% 81-126 " <br /> Surrogate 1 2-Drchloroethane-d4 97% 73-131 'I <br /> Surrogate Toluene-d8 99% 82-129 <br /> B42-98(P404555-06)Soil Sampled 04/21/04 13 40 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 0 025 mg/kg 5 4050057 05/04/04 05/04/04 EPA 8260B <br /> Tert-butyl alcohol ND 050 " <br /> Di-isopropyl ether ND 0 025 <br /> 1,2-Dibromoethane(EDB) ND 0 025 <br /> 1,2-Dichloroethane ND 0 025 <br /> Ethanol ND 10 " <br /> Ethyl tert-butyl ether ND 0 025 " <br /> Methyl tert-butyl ether ND 0 025 " <br /> Surrogate Dtbroinu luoromcthane 105% 81-126 <br /> Surrogate 1 2-Drchloroethane-d4 24% 73-131 S02 <br /> Surrogate Toluene-d8 140% 82-129 Sol <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 reportLd on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 18 <br />