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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 /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/05/04 11 06 <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 /> ATR4(P403320-04)Water Sampled 03/12/04 10 10 Received 03/12/0415 50 <br /> Ethanol ND 100 ug/1 1 4C25003 03/25/04 03/25/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 " " 11 " " <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 /> Surrogate 12-Dichloroethane-d4 966% 78-129 " <br /> ATR-5(P403320-05)Water Sampled 03/12/04 11 40 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/1 1 4C25003 03/25/04 03/2904 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether 16 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> ,mbirt-Amyl methyl ether ND 050 " <br /> rogate 12-Dichloroethane-d4 994% 78-129 " <br /> ATR-6(P403320-06)Water Sampled 03/12/04 11 20 Received 03/12/04 15 50 <br /> Ethanol ND 100 u9/1 l 4C25003 03/25/04 03/26/04 EPA 8260B <br /> cert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether 1 1 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 12-Dichloroethane-d4 992% 78-129 " <br /> quoia Analytical-Petaluma The results to 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 7 of 16 <br />