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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776 9600 <br /> a— ) <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs corn <br /> ecor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0860 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/23/02 10 48 <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-6 MLK0860-06 Water Sampled 11/21/0213 19 Received 11/22/02 11 52 <br /> tert-Butyl alcohol 2500 2000 ug/l 100 2L12027 12/04/02 12/05/02 EPA 82608 <br /> Methyl tert-butyl ether 57000 50 " E <br /> Di-isopropyl ether ND 50 <br /> Ethyl tent-butyl ether ND 50 <br /> Cert-Amyl methyl ether 68 50 " " " 0-09 <br /> 1,2-Dichloroethane ND 50 <br /> 1,2-Dibromoethane(EDB) ND 50 <br /> Surrogate 12-Dtchloroethane-d4 884% 78-129 " <br /> MW-6 LK0860-06RE1 Water Sampled 11/21/0213 19 Received 11/22/02 11 52 HT-RE <br /> Methyl tert-butyl ether 39000 1000 ug/1 2000 2L19025 12/17/02 12/18/02 EPA 8260E <br /> Surrogate 1,2-Dtchloroethane-d4 988% 78-119 " <br /> MW-7(MLK0860-07)_Water Sampled 11/20/02 13 57 Received 11/22/02 11 52 <br /> tert-Butyl alcohol ND 20 ug/l I 2L12026 12/04/02 12/04/02 EPA 8260E <br /> thy/tert-butyl ether 63 0 SQ <br /> isopropyl ether ND 050 <br /> 'Tkyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 009 <br /> 1,2-Dichloroethane 085 050 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> Surrogate 12-Dichloroethane-d4 818% 78-119 0-10 <br /> MW-8(MLK0860-OS)Water Sampled 11/20/02 14 30 Received 11/22/02 11 52 _ <br /> tert-Butyl alcohol ND 20 ug/1 1 2L12026 12/04/02 12/04/02 EPA 8260E <br /> Methyl tert-butyl ether 066 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " 0-09 <br /> I,2-Dtchloroethane ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 792% 78-129 0-10 <br /> Sequoia Analytical-Morgan Hili 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 to its entirety <br /> Page 11 of 23 <br />