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4D Sequoia 885 Jarvis Dr Mcrgpn Hi 1,CA 95037 ► Analytical (408)776- FAX(408)782-6308 www sequoialabs can Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MMB0227 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/25/03 11 03 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Morgan Hill Reporting [:Iy-tc Result Litt Units Dilution Batch Prepared Analyzed Method Notes EW-6 MM130227-10 Water Sampled 01/31/03 12 45 Received 02/06/03 16 30 Ethanol ND 8000 ug/l 200 31313007 02/13/03 02/13/03 EPA 8260B tert-Butyl alcohol ND 4000 Methyl tert-butyl ether 600 100 Di-isopropyl ether ND 100 Ethyl tert-butyl ether ND 100 " tert-Amyl methyl ether ND 100 1,2-Dichloroethane ND 100 " 1,2-Dibromoethane(EDB) ND 100 Surrogate 1,2-Dichloroethane-d4 910% 78-119 H DMW-2 B0227-11 Water Sampled 01/30/0313 58 Received 02/06/03 16 30 Ethanol ND 40 ug/I I 3B13007 02/13/03 02/13/03 EPA 8260B tert-Butyl alcohol ND 20 " „ ++ Methyl tert-butyl ether 33 050 Di-isopropyl ether ND 050 " a'tyl tert-butyl ether ND 050 -Amyl methyl ether ND 050 1,2-Dichloroethane ND 050 " 1,2-Dibromoethane(EDB) ND 050 Surrogate 12-Dichloroethane-d4 954% 78-129 DMW-3(MMB0227-12)Water Sampled 01/30/03 Id 43 Received 02/06/03 16 30 Ethanol ND 40 ug/1 1 3B13007 02/13/03 02/13/03 EPA 8260B tcrt-Butyl alcohol ND 20 Methyl tert-butyl ether 37 050 " Di-isopropyl ether ND 050 Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 1,2-Dichloroethane ND 050 " 1,2-Dibromoethane(EDB) ND 050 " Surrogate 1,2-Dichloroethane-d4 926% 78-129 quoia Analytical-Morgan Hill The results to this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety 11 of 21