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l Blvd,North Ste D <br /> 4D Sequoia ]455Mct7owPetaluma,CA949 4 <br /> (701)792-1865 <br /> ��► Analytical FAX(701)792-0342 <br /> www sequotalabs oom <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P406072 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/17/04 17 27 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-8(P406072-02)Water Sampled 06/01/04 15 30 Received 06/02/04 09 45 <br /> Ethanol ND 100 ug/l I 4F 14005 06/14/04 06/14/04 EPA 8260E <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-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 109% 78-119 " <br /> ATR-5(P406072-03)Water Sampled 06/01/04 15 40 Received 06/02/04 09 45 <br /> Ethanol ND 100 ugll 1 4F14005 06/14/04 06/15/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tent-butyl ether 11 050 " <br /> "i-isopropyl ether ND 050 <br /> thyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 112% 78-119 " <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 I 1 <br />