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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> 14(a) www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 16 58 <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-12-30(P307344-07)Soil Sampled 07/15/03 10 30 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070564 07/26/03 07/26/03 EPA 8260B <br /> Benzene ND 00050 " <br /> Tort-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 cert-butyl ether ND 00050 <br /> Methyl Cert-butyl ether ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> *rrogate Dibromofluoromethane 106% 81-126 " <br /> rrogate 12-Dichloroethane-d4 101 % 73-131 " <br /> Surrogate Toluene-d8 112% 81-129 <br /> MW-12-35(P307344-08)Soil Sampled 07/15/031035 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mglkg 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 " 1 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 0 0050 " <br /> Ethanol ND 020 <br /> Ethylbenzene ND 0 0050 " <br /> Ethyl tent-butyl ether ND 0 0050 " <br /> Methyl tert-butyl ether ND 0 0050 " <br /> Toluene ND 0 0050 1' " <br /> Xylenes(total) ND 0 0050 " <br /> Surrogate DibromoJluoromethane 108% 81-126 " <br /> Surrogate 1,2-Dichloroethane-d4 104% 73-131 <br /> Surrogate Toluene-d8 113% 82-129 " <br /> equoia Analytical-Petaluma The results en this report apply to[he samples analyzed to accordance with the Chain <br /> of custody document Unless otherwise slated, resulls are reported on a wet weigh[ <br /> basis This analytical report must be reproduced to[[s entirety <br /> Page 7 of 14 <br />