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a— ) 885 larvas Dore <br /> Sequoia Morgan Hill CA 95037 <br /> 408)7T6--9600 <br /> Analytical PAX(408)782-6308 <br /> www sequoialabs eom <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932, Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Protect Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method Nose <br /> EW-6(MNG0371-15)Water Sampled 07/13/04 12 10 Received 07/14/04 13 40 <br /> tert-Amyl methyl ether N1) 50 ug/l 100 4G21002 47/21/04 07/22/04 EPA 8260B <br /> Benzene 98 50 <br /> tert-Butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 <br /> Ethyl tert-butyl ether ND 50 <br /> Ethylbenzene ND 50 " <br /> Methyl tert-butyl ether 4700 50 <br /> Toluene 76 50 <br /> Xylenes(total) 160 50 <br /> Gasoline Range Organics(C4-C12) ND 5000 <br /> Surrogate 1,2-Dichloroethane-d4 102% 78-129 <br /> DMW-1(MNG0371-16)Water Sampled 07/14/04 09 06 Received 07/14/04 13 40 <br /> tert-Amyl methyl ether ND 050 ug/I 1 4G22001 07/22/04 07/22/04 EPA 8260E <br /> Benzene ND 050 <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether 2 6 050 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane 6 3 050 <br /> Ethanol ND 100 " " " " " IC <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether 17 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 <br /> Surrogate 12-Dichloroethane-d4 82% 78-129 <br /> Sequoia Analytical-Morgan Hill 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 i l of 24 <br />