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North Ste <br /> Sequoia 1455 McDowell <br /> Petaluma CA 949 4 <br /> 865 <br /> Analytical il) (707)792-0 <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 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 /> ATR-9(P309407-09)Water Sampled 09/18/03 12 55 Received 09/19/03 15 25 <br /> Tert-amyl methyl ether ND 10 UFA I 3100050 10/02/03 10/02/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 101 % 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> TR-10(P309407-10)Water Sampled 09/18/03 12 35 Received 09/19/03 15 25 <br /> 'Wert-amyl methyl ether ND 10 ug/l 1 3100050 10/02/03 10/02/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 102% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Sequoia 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 9 of 16 <br />