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I 885 Jarvis Dr HiU,CA Sequoia Main(408)776-90600 iw Analytical FAX(408)782 6308 www sequotalabs 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 Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-11 MMB0227-0 Water Sampled 01/30/0312 34 Received 02/06/03 16 30 Ethanol ND 40 ug/l 1 3813007 02/13/03 02/13/03 EPA 8260E tert-Butyl alcohol ND 20 " Methyl tert-butyl ether ND 050 Di-isopropyl ether ND 050 " Ethyl tert-butyl ether ND 050 " tert-Amyl methyl ether ND 050 " 1,2-Dtchloroethane ND 050 1,2-Dibromoethane(EDB) ND 050 Surrogate 1,2-Dtchloroethane-d4 952% 78-129 " EW-1 MMB0227-08 Water Sampled 01/31/0314 44 Received 02/06/03 16 30 Ethanol ND 200000 ug/l 5000 3B13036 02/13/03 02/14/03 EPA 8260B tert-Butyl alcohol ND 100000 11 11 11 " Methyl tert-butyl ether 200000 2500 " Di-isopropyl ether ND 2500 " Ethyl tert-butyl ether ND 2500 . tert-Amyl methyl ether ND 2500 " 1,2-Dtchloroethane ND 2500 " 1,2-Dibromoethane(EDB) ND 2500 " Surrogate 1,1 Dtchloroethane-d4 104% 78-129 EW-2 0227-09 Water Sampled 01/31/03 13 43 Received 02/06/03 16 30 Ethanol ND 8000 ug/l 200 31313007 02113/03 02/13/03 EPA 8260E tert-Butyl alcohol ND 4000 " " " " " Methyl Cert-butyl ether 61000 2500 5000 02/14/03 Di-isopropyl ether ND 100 200 02/13/03 Ethyl tert-butyl ether ND 100 " tent-Amyl methyl ether ND 100 " 1,2-Dichloroethane ND 100 1,2-Dibromoethane(EDB) ND 100 " Surrogate 1 2Dchloroethane-d4 89 4% 78-129 " Sequoia Analytical-Morgan Hill The results to this report apply to the samples analyzed to accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight bans This analytical report mast be reproduced to its entirety 10 of 21