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1455 McDowell Blvd North Ste 1) <br /> Sequoia Petaluma CA 94954 <br /> (D— (707)11 792-1865 <br /> _xs Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corn-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 /> B42-62(P404555-03)Sod Sampled 04/21/04 10 52 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 /> Benzene 013 0 025 " <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 Dtbromofluorontcthan e 89% 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 85% 73-131 <br /> Surrogate Tolucne-d8 109% 82-129 <br /> B42-62(P404555-03RE1)Sod Sampled 04/21/04 10 52 Received 04/23/04 11 50 <br /> Ethylbenzene 5 0 5 0 mg/kg 500 4050050 05/04/04 05/04/04 EPA 8260E <br /> Toluene 89 5 0 <br /> Xylenes(total) 32 5 0 <br /> Surrogate Dibromofluoromethane 100% 81-126 " <br /> Surrogate 12-Dichloroethane-d4 102% 73-131 " <br /> Surrogate Toluene-d8 106% 82-129 <br /> B42-77(P404555-04)Sod Sampled 04/21/04 1150 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg l 4050019 05/03/04 05/03/04 EPA 8260B <br /> Benzene 00066 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 00066 00050 " <br /> Xylenes(total) 0 022 00050 " <br /> Surrogate Dibromofluoromcthane 100% 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 98% 73-131 <br /> Surrogate Toluene-d8 97% 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 he reproduced in its entirety <br /> Page 6 of 18 <br />