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885 Jarvis Dt <br /> Sequoia Morgan Hill,CA 95437 <br /> Analytical (408)776-9600 <br /> FAX(448)782-634$ <br /> www.sequoialabs.con <br /> 4URS Corporation Project: ARCO 45450,Stockton,Ca MMC0716 <br /> 500 12th Street,Suite 100 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Oakland CA,94607 Project Manager: Vern Elarth 04/07/03 14:05 <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-4g{M149C0716-03]Water Sampled:03/14/03 09:35 Received:0311910319:00 <br /> tert-Butyl alcohol ND 20 uo 1 3C27006 03!27/03 03/28/03 EPA 8260B <br /> Methyl tert-butyl ether 0.69 0.50 " " " " It <br /> " <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 ND 0.50 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Gasoline Range Organics(C6-CIO) ND 50 <br /> Surrogate:1,2-Dichloroethane-d4 86.8% 78-129 " <br /> • <br /> �equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 4 of 7 <br />