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11455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1665 <br /> Analytical FAX(707)792-0342 <br /> www sequo,alabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307347 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number W 836616 Reported <br />' Sacramento CA,95833 Project Manager Vernon P Elarth 07/30/03 17 32 <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 /> MW-1313-25(P307347-01)Sod Sampled 07/16/03 06 50 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070564 07/26/03 07/27/03 EPA 8260E <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 010 " <br />' Di-isopropyl ether ND 00050 <br /> 1,2-Dtbromoethane(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 0 016 00050 " <br />' Toluene ND 00050 <br /> Xylenes(total) ND 00050 <br /> Surrogate Dibromofluoromethane 110% 81-126rt <br /> " <br /> rrogate 1 2-Dichloroethane-d4 105% 73-131 II <br /> rrogale Toluene-d8 114% 82-129 <br /> MW-13D-45(P307347-03)Soil Sampled 07/16/03 07 25 Received 07/16/03 13 45 <br />' Tert-amyl methyl ether ND 00050 mg/kg 1 3070577 07/28/03 07/28/03 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 010 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dtbromoethane(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 ND 00050 " <br /> Xylenes(total) ND 00050 <br /> Surrogate Dibromofluoromethane 91 % 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 91 % 73-131 <br /> Surrogate Toluene-d8 96% 82-129 " <br /> 1 <br />' Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 13 <br />