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al 1455 McDowell Blvd, Ste <br /> Sequoia Petaluma,,CA CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> FAX <br /> sequomlabs aomom <br /> • <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Dave Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 08 50 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-313(P306136-10)Water Sampled 06/09/03 05 35 Received 06/09/03 08 00 <br /> Ethanol ND 20000 ugA 200 3060528 06/20/03 06/21/03 EPA 926013 <br /> Tert-amyl methyl ether ND 200 <br /> Ter[-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 " <br /> 1,2-Dichloroethane ND 100 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tent-butyl ether 6900 100 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 1,2-Dichloroelhane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " 11 " <br /> • <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 10 of 15 <br />