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Sequoia 885)was Dr �& Morgan Hill,CA 95037 Analytic al (408)776 9600 FAX(408)782 6308 AML www sequoialabs can ecor-Rancho Cordova Project ARCO 114932,Stockton,CA MLK0860 3017 1{ilgore Rd Suite 100 Project Number ARCO#14932,Stockton,CA Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/23/02 10 48 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-1 MLK0860-01 Water Sam led 11/21/02 12 34 Received 11/22/02 11 52 tert-Butyl alcohol ND 400 ug/1 20 2L12026 12/04/02 12/04/02 EPA 8260B Methyl tert-butyl ether 1600 10 " " E Di-isopropyl ether ND 10 " Ethyl tert-butyl ether ND 10 tert-Amyl methyl ether ND 10 „ O-U9 1,2-Dichloroethane 140 10 1,2-Dibromoethane(EDB) ND 10 Surrogate 1,2-Drchloroethane-d4 844% 78-129 0-10 MW-1 LK0860-OIREI Water Sampled 11/21/02 12 34 Received 11/22/02 11 52 HT-RE Methyl tert-butyl ether 1200 20 ug/l 40 2L19025 12/17/02 12/18/02 EPA 8260B Surrogate 1,2-Drchloroethane-d4 976% 78-129 „ MW-2 MLK0860-02 Water Sampled 11/21/0211 46 Received 11/22/0211 52 tert-Butyl alcohol ND 400 ug/1 20 2L12026 12/04/02 12/04/02 EPA 826013 thy]Cert-butyl ether 1000 10 ii ;i " ii E isopropyl ether ND 10 „ yl tert-butyl ether ND 10 " tert-Amyl methyl ether ND 10 " „ " " 0-09 1,2-Drchloroethane ND I4 1,2-Dibromoethane(EDB) ND 10 " Surrogate 12-Drchloroethane-d4 824% 78-129 0-10 MW-2 LK0860-02RE1 Water Sampled-11/21/02 11 46 Received 11/22/0211 52 HT-RE Methyl tert-butyl ether 800 20 ug/l 40 2L19025 12/17/02 12/18/02 EPA 8260B Surrogate 12-Drchloroethane-d4 101 % 78-129 " o' „ Sequoia Analytical-Morgan Hill The results in 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 enlrrety Page 9 of 23