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Sequoia 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 Analytical www.sequoialabs.com 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 Zn Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-4-37' (S103413-04)Water Sampled: 03/22/01 08:08 Received: 03/22/01 12:02 R-05 Tert-butyl alcohol ND 2000 ug/l 10 4040011 04/02/01 04!02!01 EPA 8260A Di-isopropyl ether ND 20.0 " Ethyl tert-butyl ether ND 20.0 " Tert-amyl methyl ether ND 20.0 " 1,2-Dichloroethane ND 20.0 Ethylene dibromide ND 20,0 " Surrogate: 1,2-DCA-d4 114% 60-140 MW-4-37' (S103413-04RE1)Water Sampled: 03/2210108:08 Received: 03/22/01 12:02 Methyl tert-butyl ether 5100 40.0 ug/1 20 1040030 04/03/01 04/03/01 EPA 8260A A-01 Surrogate: 1,2-DCA-d4 105% 60-140 " MW-5-37' (5103413-05)Water Sampled:03/22/01 08:50 Received:03/22/01 12:02 A-02 ,dMiertbutyl alcohol ND 5000 ugll 25 1040030 04/03/01 04/03/01 EPA 8260A i-isopropyl ether ND 50.0 " thyl tert-butyl ether ND 50.0 " Tert-amyl methyl ether ND 50.0 " 1,2-Dichloroethane ND 50.0 " Ethylene dibromide ND 50.0 " Surrogate: 1,2-DCA-d4 104 % 60-140 " MW-5-37' (5103413-05RE1)Water Sampled: 03/22/0108:50 Received: 03/22/01 12:02 Methyl tert-butyl ether 15600 200 uJl 1.00 1040030 04/03/01 04/03/01 EPA 8260A Surrogate: 1,2-DCA-d4 113 % 60-140 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, i Page 5 of 12