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4D Sequoia 1455 McDowell Blvd, <br /> CA 94954 <br /> (707)792-1865 <br /> IW Analytical FAX(707)792-0342 <br /> www"uoialabs coin <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 /> ATR-1 (P403320-01)Water Sampled 03/12/0410 50 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/I 1 4C25003 03/25/04 03/25/04 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 <br /> Surrogate 1,2-Dtchloroethane-d4 954% 78-129 " <br /> ATR-2(P403320-02)Water Sampled 03/12/04 12 00 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/1 1 4C25003 03/25/04 03/25/04 EPA 8260B <br /> tent-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 060 050 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> ,,W.-Amyl methyl ether ND 050 " <br /> -gate 12-Dtchloroethane-d4 932% 78-129 " <br /> ATR-3(P403320-03)Water Sampled 03/12/04 12 25 Received 03/12/04 15 50 <br /> Ethanol ND 100 ug/l I 4C25003 03/25/04 03/25/04 EPA 8260B <br /> tett-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 <br /> Di-isopropyl ether ND 0 50 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 0 50 <br /> Surrogate 1,2-Dtchloroethane-d4 964% 78-129o <br /> " <br /> uoia 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 6 of 16 <br />