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,i 1455 McDowell Blvd,alum North Ste <br /> Sequoia Petaluma,CA 949544 <br /> a— ) (707)792-1865 <br /> ► Analytical FAX(707)7920342 <br /> www sequmalabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 07/16/03 08 50 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Motes <br /> MW4(P306136-04)Water Sampled 06/09/03 03 47 Received 06/09/03 08 00 <br /> Ethanol ND 10000 ugA 100 3060501 06/20/03 06/20/03 EPA 8260B <br /> Tert-amyl methyl ether ND 100 ^ <br /> Tert-butyl alcohol ND 2000 " ^ <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dichloroethane ND 50 ^ <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether 3200 50 <br /> Surrogate Dibromofluoromethane 99% 84-122 <br /> Surrogate 12-Dichloroethane-d4 105% 74-135 <br /> Surrogate Toluene-d8 107% 84-119 " <br /> MW-5(P306136-05)Water Sampled 06/09/03 07 25 Received 06/09/03 08 00 <br /> Ethanol ND 100 ug/1 1 3060501 06/20/03 06/20/03 EPA 8260B <br /> Tert-amyl methyl ether ND 10 " <br /> rt-butyl alcohol ND 20 <br /> We-isopropyl <br /> ether ND 10 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethyl tert-butyl ether ND 10 ^ <br /> Methyl tert-butyl ether ND 050 " ^ <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> MW-6(P306136-06)Water Sampled 06/09/03 06 40 Received 06/09/03 08 00 <br /> Ethanol ND 100 ug/l 1 3060501 06/20/03 06/20/03 EPA 8260B <br /> Tert-amyl methyl ether ND 10 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " ^ <br /> 1,2-Dichloroethane ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dihromofluoromethane 102% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 105% 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,S of 15 <br />