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• 885 Jarvis(5037 D Sequoia Morgan Hill,CA 95037 (408)776.9600 Analytical FAX(408)782-6308 J wwwsequoialahs.com Secor-Rancho Cordova(ARCO) Project:ARCO#2133, Stockton,CA M00O299 3017 Kilgore Rd.Suite 100 Project Number:N/P Reported: Rancho Cordova CA,95670 Project Manager:Rusty Benkosky 03/23/05 13:43 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical- Morgan Hill Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note MW-3(M00O299-15)Water Sampled:03/07/05 13:50 Received:03/08/05 117:30 tert-Amyl methyl ether ND 0.50 ug/1 1 SC21005 03/21/05 03/21/05 EPA 8260B Benzene ND 0.50 " tert-Butyl alcohol ND 20 " Di-isopropyl ether ND 0.50 " 1,2-Dibromoethane(EDB) ND 0.50 " 1,2-Dichloroethane ND 0.50 Ethanol ND 100 " Ethyl tert-butyl ether ND 0.50 " Ethylbenzene ND 0.50 " Methyl tert-butyl ether ND 0.50 " Toluene ND 0.50 " Xylenes(total) ND 0.50 " Gasoline Range Organics(C4-C12) ND 50 " Surrogate: 1,2-Dichloroethane-d4 86% 60-135 " IW-4(M00O299-16)Water Sampled:03/07/05 13:15 Received:03/08/05 17:30 tert-Amyl methyl ether ND 0.50 ug/I 1 5C21005 03/21/05 03/21/05 EPA 8260B Benzene ND 0.50 " tert-Butyl alcohol ND 20 " Di-isopropyl ether ND 0.50 " 1,2-Dibromoethane(EDB) ND 0.50 " 1,2-Dichloroethane ND 0.50 " Ethanol ND 100 Ethyl tert-butyl ether ND 0.56 " Ethylbenzene ND 0.50 " Methyl tert-butyl ether ND 0.50 " Toluene ND 0.50 " Xylenes(total) ND 0.50 " Gasoline Range Organics(C4-C12) ND 50 Surrogate: 1,2-Dichloroethane-d4 92% 60-135 " 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 entirety. Page 10 of 17