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1455 McDowell Blvd,North Ste D <br /> !•� Sequoia Petaluma,CA94865 <br /> FAX <br /> Analytical (707)792 1865 <br /> (707)792 0342 <br /> www sequcialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Dnve Suite 300 Protect 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-11-30(P307344-04)Soil Sampled 07/15/03 08 45 Received 07/16/03 13 45 " <br /> Tort-amyl methyl ether ND 00050 mg/kg 1 3070531 07/24/03 07/25/03 EPA 8260B <br /> Benzene ND 00050 11" <br /> Tert-butyl alcohol ND 010 " IF <br /> Di-isopropyl ether ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichioroethane ND 00050 " <br /> Ethanol ND 020 <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> IF <br /> Methyl tert-butyl ether ND 00050 IF " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " IF <br /> .Askurrogate Dibromofluoromethane 95% 81-126 " <br /> rrogate 1,2-Dichloroethane-d4 95% 73-131 " <br /> Surrogate Toluene-d8 99% 82-129 IF <br /> IF <br /> MW-12-20(P307344-06)Sod Sampled 07/15/03 10 20 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070531 07/24/03 07/25/03 EPA 8260B <br /> Benzene ND 00050 IFIF IF <br /> Tert-butyl alcohol ND 010 " " " <br /> Di-isopropyl ether ND 00050 IF IF 1 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 020 IF <br /> Ethylbenzene ND 00050 <br /> Ethyl tert-butyl ether ND 00050 IF " <br /> Methyl tert-butyl ether ND 00050 IF " <br /> Toluene ND 00050 1. <br /> 11 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate DibromoJluoromethane 96% 81-126 IF <br /> IF <br /> 11 <br /> Surrogate 1,2-Dichloroethane-d4 97% 73-131 IF IF <br /> ;i <br /> Surrogate Toluene-d8 101 % 82-129 " <br /> 11 <br /> equoia 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 6 of 14 <br />