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1455 McAow P Blvd,North Ste <br /> � Sequoia Petaluma,CA 449544 <br /> (707)792-1865 <br /> FAX Analytical wwsequ7ialabs 342 <br /> www sequaa]abs corn I <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Lieut Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-7(P306156-04)Water Sampled 06/09/03 11 15 Received 06/10/03 09 05 <br /> Tert-amyl methyl ether ND 10 ugll 1 3060535 06/21/03 06/21/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate I 1-Dichloroelhane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 94% 84-119 " <br /> ATR-8(P306156-05)Water Sampled 06/09/03 12 30 Received 06/10/03 09 05 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3060535 06/21/03 06/21/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 " <br /> i-isopropyl ether ND 10 <br /> INUVEthanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoramethane 110% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 117% 84-119 " <br /> ATR-12(P306156-06)Water Sampled 06/09/03 11 35 Received 06/10/03 09 05 <br /> Tert-amyl methyl ether ND 10 ugll 1 3060535 06/21/03 06/21/03 EPA 8260B <br /> Ter[-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 108% 84-121 " <br /> Surrogate 1 2-Dichloroethane-d4 101 % 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> 0 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 12 <br />