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Sequoia 1455 McDowellPetalvuma,CA 949544 <br /> (707)792 1865 <br /> • Analytical FAX(707)792-0342342 <br /> www sequolalabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P312737 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/04 19 10 <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-8(P312737-05)Water Sampled 12/24/03 12 15 Received 12/29/03 13 15 <br /> Tert-aroyl methyl ether ND 10 ugll 1 4010065 01/07/04 01/07/04 EPA 8260E <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 tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 30 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " ^ <br /> Surrogate Dibromofluoromethane 107% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 103% 74-135 " <br /> • Surrogate Toluene-d8 140% 84-119 " <br /> ATR-12(P312737-06)Water Sampled 12/24/03 10 40 Received 12/29/03 13 15 <br /> Tert-amyl methyl ether ND 1 0 ug11 1 4010065 01/07/04 01/07/04 EPA 826013 <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 D " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 0 50 " ^ <br /> Surrogate Dtbromofluoromethane 113% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 104% 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 <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 6 of 10 <br />