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'Y A t455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> s <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-1 (P309407-01)Water Samp[ed 09/18/03 14 00 Received 09/19/03 15 25 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 3100050 10/02/03 10/02/03 EPA 8260E <br /> Benzene ND 0 50 " " 11 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl Cert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 056 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 101 % 84-122 " <br /> Surrogate 12-Dichloroethane-d4 148% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> ATR-2(P309407-02)Water Sampled 09/38/03 14 40 Received 09/19/03 15 25 <br /> Wert-amyl methyl ether ND 1 0 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 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 9 4 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 109% 74-135 " <br /> Surrogate Toluene-d8 95% 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 5 of 16 <br />