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885 Jarvis Dr <br /> a— Sequoia Morgan Hill CA 95037 <br /> (408)776-4600 <br /> Analytical FAX 782 6308 <br /> coin <br /> www sequoiegooialahs coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO 44932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <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 Note <br /> EW4(MNG0370-01)Water Sampled 07/141041230 Received 07/14/04 I3 40 <br /> tert-Amyl methyl ether ND 1000 ug/l 2000 4G19006 07!19104 07/19/04 EPA 8260B <br /> Benzene ND 1000 " <br /> tert-Butyl alcohol ND 40000 <br /> Di-isopropyl ether ND 1000 " <br /> 1,2-Dibromoethane(EDB) ND 1000 " <br /> 1,2-Dichloroethane ND 1000 " <br /> Ethanol ND 200000 " <br /> Ethyl tert-butyl ether ND I000 " <br /> Ethylbenzene ND 1000 " <br /> Methyl tert-butyl ether 40000 1000 " <br /> Toluene ND 1000 " <br /> Xylenes(total) ND 1000 " <br /> Gasoline Range Organics(C4-Cl2) ND 1000004R <br /> " <br /> urrogate 1,2-Dichloroethane-d4 105% 78-129 <br /> W-5(MNG0370-02)Water Sampled 07114104 13 15 Received 07/14/04 13 40 <br /> tert-Amyl methyl ether ND 50 ug/l 100 4619006 07/19/04 07/19/04 EPA 8260B <br /> Benzene ND 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 2200 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 50 " <br /> Gasoline Range Organics(C4-C12) ND 5000 " <br /> Surrogate 1,2-Dichloroethane-d4 105% 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 3 of 11 <br />