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orth Ste <br /> Sequoia 1455 McDoweP[etalluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)7920342 <br /> • www sequoialahs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan H111 <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-8(P406056-04)Water Sampled 05/26/04 13 15 Received 05/28/04 16 05 <br /> Ethanol ND 100 ug/l I 4FO7003 06/07/04 06/07/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " ^ <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 120% 78-129 " <br /> MW-9(P406056-05)Water Sampled 05/26/04 13 05 Received 05/28/04 16 05 <br /> Ethanol ND 100 ugll I 4FO7003 06/07/04 06/07/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> i-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 78-129 " <br /> MW-10(P406056-06)Water Sampled 05/26/04 13 30 Received 05/28/04 16 05 <br /> Ethanol ND 100 ug/1 I 4FO7003 06/07/04 06/07/04 EPA 82608 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 122% 78-129 " <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 9 of 20 <br />