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Sequoia E455McDowPetaBlvd, <br /> umallorth Ste 4 <br /> Petaluma,CA 94954 <br /> a— ) (707)792-1865 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs com <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 Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-5(P309407-05)Water Sampled 09/18/03 11 25 Received 09/19/03 15 25 <br /> Tert-amyl methyl ether ND 5 0 ug/l 5 3100050 10/02/03 10/02/03 EPA 8260B <br /> Benzene ND 2 5 <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 <br /> Ethanol ND 500 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl cert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether 59 25 <br /> Toluene ND 2 5 <br /> Xylenes(total) ND 2 5 <br /> Surrogate Dtbromofluoromethane 104 % 84-112 <br /> Surrogate 1 2-Dtchloroethane-d4 111 % 74-135 <br /> Surrogate Toluene-d8 95% 84-119 <br /> ATR-6(P309407-06)Water Sampled 09/18/03 11 00 Received 09/19/03 15 25 <br /> ert-amyl methyl ether ND 1 0 ug/l 1 3100050 10/02/03 10/02/03 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 tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 11 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 108% 84-112 " <br /> Surrogate 1 2-Dtchloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 94916 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 7 of 16 <br />