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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> • <br /> a— ) (707) <br /> 792-1865 <br /> Analytical FAX 707 <br /> www.sequoialabsc342 <br /> om <br /> URS Corp-Sacramento Project: Arco Site 760,Lodi,CA P304288 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36622 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 04/25/03 17:11 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (P304288-01)Water Sampled:04/10/03 14:55 Received:04/11/03 14:30 <br /> Ethanol ND 100 ug/l 1 31323008 04/23/03 04/23/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 1.6 0.50 " <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tert-butyl ether ND 0.50 <br /> tert-Amyl methyl ether ND 0.50 <br /> 1,2-Dichloroethane 9.4 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate: 1,2-Dichloroethane-d4 102% 78-129 " <br /> MW-2(P304288-02)Water Sampled:04/10/03 15:15 Received:04/11/03 14:30 <br /> Ethanol ND 100 ug/l 1 3D23008 04/23/03 04/23/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 0.56 0.50 " <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tert-butyl ether ND 0.50 <br /> tert-Amyl methyl ether ND 0.50 <br /> 1,2-Dichloroethane 0.76 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate:1,2-Dichloroethane-d4 103% 78-129 <br /> MW-3(P304288-03)Water Sampled:04/10/03 15:35 Received:04/11/03 14:30 <br /> Ethanol ND 100 ug/l 1 3D23008 04/23/03 04/23/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether 0.68 0.50 " <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tert-butyl ether ND 0.50 <br /> tert-Amyl methyl ether ND 0.50 <br /> 1,2-Dichloroethane 10 0.50 <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate:1,2-Dichloroethane-d4 104% 78-129 " <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 4 of 8 <br />