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Sequoia 819 Striker Avenue,Suite 4. Sacramento,CA 958344 (916)921-96W A��--qq , FAX(916)921-01100 nalytical www.sequoialabs.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-7(S209427-06)Water Sampled: 09/19/02 04:06 Received:09/19/02 09:30 Tert-butyl alcohol ND 5.0 ug/l 1 2100002 10/01/02 10/01/02 EPA 8260B Di-isopropyl ether ND 0.50 " ^ Ethyl tert-butyl ether ND 0.50 " Tert-amy]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 - — 116% 60-140 MW-7(S209427-06RE1)Water Sampled: 09/19/02 04:06 Received: 09/19/02 09:30 Methyl tert-butyl ether 110 1.0 ug/l 2 2100049 10/03/02 10/03/02 EPA 8264B Surrogate: 1,2-DCA-d4 85% 60-140 " W-8(5209427-07)Water Sampled: 09/19/02 05:08 Received:09/19/02 09:30 ,lown-butyl alcohol ND 500 ❑g/I 100 2100002 10/01/02 10/01/02 EPA 826013 Di-isopropyl ether ND 50 Ethyl tert-butyl ether ND 50 " Tert-amyl methyl ether ND 50 " Ethanol ND 5000 " 1,2-Dichloroethane ND 50 " 1,2-Dibrornoethane(EDB) ND 50 Surrogate: 1,2-DCA-d4 105% 60-140 " MW-8(5209427-07RE1)Water Sampled:09/19/02 05:08 Received: 09/19/02 09:30 Methyl tert-butyl ether 16000 500 ug/l 1000 2100049 10/03/02 10/03/02 EPA 8260B Surrogate: 1,2-DCA-d4 84% 60-140 --�---- - ^��— -- 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 7 of 13