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n ' <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (D— (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 /> B39-17(P402493-01)Soil Sampled 02/17/04 10 20 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4020565 02/25/04 02/25/04 EPA 8260B <br /> Benzene 0 057 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 0 050 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether 0 083 00050 " <br /> Toluene 0 012 00050 " <br /> Xylenes(total) 010 00050 " <br /> Surrogate Dibromofluoromethane 107% 81-126 <br /> 0loogate 12-Dichloroethane-d4 105% 73-131 " <br /> gate Toluene-d8 107% 82-129 " <br /> B39-30(P402493-02)Soil Sampled 02/17/04 11 10 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 0 025 mg/kg 5 4020565 02/25/04 02/25/04 EPA 8260B <br /> Benzene 0 056 0 025 1, 11 " " " <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 /> Ethylbenzene ND 0 025 " <br /> Ethyl tent-butyl ether ND 0 025 " <br /> Methyl tert-butyl ether 035 0 025 <br /> Toluene ND 0 025 " <br /> Xylenes(total) ND 0 025 " <br /> Surrogate Dibromofluoromethane 103% 81-126 " <br /> Surrogate 12-Dichloroethane-d4 94% 73-131 <br /> Surrogate Toluene-d8 96% 82-129 <br /> 0uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of cuslody 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 25 <br />