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Striker Sequoia 8 19Sac amento,uCA 95834 1ia . (916)921-96W Analytical wFAX(916)90 wwsequoialabs.coabs.com Stratus Environmental Project: ARCO 5469,Stockton,CA 3330 Cameron Park Drive,Ste. 550 Project Number: 5469,Stockton,CA Reported: Cameron Park CA, 95682 Project Manager: Jay Johnson 10/14/02 16:55 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical-Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-1 (S209427-01)Water Sampled: 09/19/02 07:40 Received: 09/19/02 09:30 Tert-butyl alcohol ND 5.0 ugA 1 2100002 10/01/02 10/01/02 EPA 8260B Methyl tent-butyl ether 7.2 0.50 Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Ethanol ND 50 1,2-Dichloroethane ND 0.50 " 1,2-Dibromoethane(EDB) ND 0.50 Surrogate: 1,2-DCA-d4 112% 60-140 " MW-2(5209427-02)Water Sampled. 09/I9/02 07:52 Received:09/19/02 09:30 Tert-butyl alcohol ND 5.0 ug/1 1 2100002 10/01/02 ]0/01/02 EPA 8260E Methyl tert-butyl ether ND 0.50 Isopropyl ether ND 0.50 " yl tent-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Ethanol ND 50 " 1,2-Dichloroethane ND 0.50 " 1,2-Dibromoethane(EDB) ND 0,50 Surrogate: 1,2-DC4-d4 115% 60-140 MW-3(SZ09427-03)Water Sampled: 09/19/02 07:46 Received: 09/19/02 09:30 Tert-butyl alcohol ND 5.0 ug/l 1 2100002 20/01/02 10/01/02 EPA 8260B Methyl ter(-butyl ether 2.3 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 Ethanol ND 50 1,2-Dichloro ethane ND 0.50 « 1,2-Dibromoethane(EDB) ND 0.50 " Surrogate: 1,2-DCA-d4 110% 60-140 " to „— - quoia 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 5 of 13