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""1il 1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792 1865 <br /> low Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> 4 <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 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 <br /> EL Result Lirrut Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-3(P309407-03)Water Sampled 09/18/03 14 20 Received 09/19/03 15 25 <br /> Teri-amyl methyl ether ND 1 0 ugA 1 3100050 10/02/03 I0/02/03 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 ^ <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 " ^ <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 106% 84-122 " <br /> Surrogate i 2-Dichloroethane-d4 110% 74-135 <br /> Surrogate Toluene-d8 96% 84-119 " <br /> ATR-4(P309407-04)Water Sampled 09/18/03 13 20 Received 09/19/03 15 25 <br /> !er-t-amyl methyl ether ND 1 0 ug/l 1 3100050 10/02/03 10/02/03 EPA 8260E <br /> enzene ND 050 <br /> Teri-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tent-butyl ether ND 1 0 " ^ <br /> Methyl tent-butyl ether ND 050 " ^ <br /> Toluene ND Q 50 ^ <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 107% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <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 6 of 16 <br />