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885 Jarvis Dr <br /> Sequoia Mogan Hill,CA 95037 <br /> low Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.mquoialabsx,cm <br /> S Corporation Project: ARCO#5450,Stockton,Ca MLI-0109500 12th Street,Suite 100 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Oakland CA,94607 Project Manager: Vem Elarth 12/23/02 12:08 <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-2 LL0109-01 Water Sampled: 1112710212:05 Received:12102/0216:50 <br /> tert-Butyl alcohol ND • 20 uo 1 2L13033 12/11/02 12/11/02 EPA 8260D <br /> Methyl tert-butyl ether 43 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 ND 0.50 <br /> 1,2-Dibromoethane(EDB) ND ' 0.50 <br /> Benzene ND 0.54 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.54 <br /> Xylenes(total) ND 0.50 <br /> Gasoline Range Organics(C6-C 10) ND 50 <br /> Surrogate:1,1-Dichloroethane-d4 97.4% 78-129 " <br /> MW-3(MLL0109-02)Water Sampled: 11/2710211:35 Received: 1210210216:50 <br /> rt-Butyl alcohol ND 20 ugfl 1 2L13033 I2/11102 12/11/02 EPA 8260B <br /> ethyl tert-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.54 " <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-C10) ND 50 <br /> Surrogate:1,2-Dichloroethane-d4 104% 78-129 " <br /> Sequoia Analytical-Morgan Hill Ae 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 3 of 6 <br />