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(D (70orth Ste <br /> Sequoia 1455 McDowPetaalumaNCA 9495D4 <br /> r <br /> 7)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Coro-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 /> B39-64(P402493-04RE1)Soil Sampled 02/17/04 14 25 Received 02/19/04 10 00 HT-05 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4030433 03/16/04 03/I6/04 EPA 8260B <br /> Benzene 0 063 00050 " <br /> Tert-butyl alcohol ND 010 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane 0 014 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene 00081 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene 0 053 00050 " <br /> Xylenes(total) 0 053 00050 " <br /> Surrogate Dibromofluoromethane 108% 81-126 " <br /> ogate 12-Dichloroethane-d4 103% 73-131 <br /> ogate Toluene-d8 114% 82-129 <br /> B39-88(P402493-05)Soil Sampled 02/17/04 16 15 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 0025 mg/kg 5 4020616 02/27/04 02/27/04 EPA 8260B <br /> Benzene 0014 0010 " <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 ND 0 025 " <br /> Toluene ND 0 025 " <br /> Xylenes(total) ND 0 025 " <br /> Surrogate Dibromofluoromethane 107% 81-126 <br /> Surrogate 1,2-Dichloroethane-d4 102% 73-131 " <br /> Surrogate Toluene-d8 97% 82-129 " <br /> �uoia 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 7 of 25 <br />