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819 Striker Avenue, Suite 8 Sequoia Sacramento,CA 95834 (916)921-9600 Analytical FAX 92 1-0100 FAX Delta Environmental Consultants(Cameron Park) Project: ARCO 5469,Stockton, CA 3330 Cameron Park Dr. Project Number: NIA Reported: Cameron Park CA,95682 Project Manager: Jay Johnson 04/04/01 17:07 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-1-37' (S103413-01)Water Sampled: 03/22/0106:44 Received: 03/22/01 12:02 Tert-butyl alcohol ND 200 ugll 1 1040011 04/02/01 04/02/01 EPA 8260A Methyl tent-butyl ether 2.20 2.00 1. ^ " Di-isopropyl ether ND 2.00 " Ethyl tert-butyl ether ND 2.00 ^ Tert-amyl methyl ether ND 2.00 " 1,2-Dichloroethane ND 2.00 " Ethylene dibromide ND 2.00 " Surrogate: 1,2-DCA-d4 T� 105% 60-140 �T" " 11 _- MW-2-37'(5103413-02)Water Sampled: 03/22/0107:15 Received: 03/22/0112:02 Tert-butyl alcohol ND 200 ugo/l 1 1040011 04/02/01 04/02/01 EPA 8260A Methyl tert-butyl ether ND 2.00 Di-isopropyl ether ND 2.00 " Ethyl tert-butyl ether ND 2.00 " rt amyl methyl ether ND 2.00 ,2-Dichioroethane ND 2.00 " Ethylene dibromide ND 2.00 " Surrogate: 1,2-DC,4-d4 113% 60-140 11 " 11 11 MW-3-37'(S103413-03)Water Sampled: 03/22/01 07:40 Received: 03/22/01 12:02 j Tert-butyl alcohol ND 200 ug/I 1 1040011 04102/0I 04/02/01 EPA 8260A Methyl tert-butyl ether ND 2.00 " Di-isopropyl ether ND 2.00 Ethyl tert-butyl ether ND 2.00 Tert-amyl methyl ether ND 2.00 " 1,2-Dichloroethane ND 2.00 " Ethylene dibromide ND 2,00 Surrogate: 1,2-DC444 116% 60-140 11 11 " 11 �equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Page 4 of 12