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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 4D (707) 9r72-1865 <br /> iW Analytical FAX(707) 342 <br /> www sequoilabs alabs com <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 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 Lurut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-7(P306136-07)Water Sampled 06/09/03 06 58 Received 06/09/03 08 00 <br /> Ethanol ND 100 ugn 1 3060501 06/20/03 06/20/03 EPA 8260B <br /> Tert-amyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl 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% 84-121 " <br /> Surrogate I 1-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> VW-113(P306136-08)Water Sampled 06/09/03 06 07 Received 06/09/03 08 00 <br /> Ethanol ND 25000 ug/l 250 3060501 06/20/03 06/20/03 EPA 8260E <br /> Tert-amyl methyl ether ND 250 " <br /> �ert-butyl alcohol ND 500011" " <br /> Di-isopropyl ether ND 250 <br /> 1,2-Dichloroethane ND 120 " <br /> Ethyl tort-butyl ether ND 250 " <br /> Methyl ter(-butyl ether 860 120 " <br /> Surrogate Dibromofluoromethane 99% 84-121 " <br /> Surrogate 1 1-Dichloroethane-d4 105% 74-135 <br /> Surrogate Toluene-d8 105% 84-119 " <br /> VW-2B(P306136-09)Water Sampled 06/09/03 05 18 Received 06/09/03 08 00 <br /> Ethanol ND 2000 ugll 20 3060528 46/20/03 06/21/03 EPA 8260B <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 400 " <br /> Di-isopropyl ether ND 20 " <br /> 1,2-Dichloroethane ND 10 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 810 10 " <br /> Surrogate Dibromofluoromethane 104 % 84-121 " <br /> Surrogate 1 2-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 107% 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 9 of 15 <br />