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819 Striker Ave Ste 8 Sequoia Sacramento,CA 95834 (916)921-9600 FAX iWAnalytical www.sequoialabs.com 0 Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S309067 6747 Sierra Court,Ste.1 Project Number: N/A Reported: Dublin CA,94568 Project Manager: Deanna L. Harding 09/15/03 16:39 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-9(5309067-10)Water Sampled:08/29/03 13:07 Received: 09/02/03 16:20 Tert-butyl alcohol ND 5.0 ug/l 1 3090081 09/05/03 09/05/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 90% 60-140 " U-10(5309067-11)Water Sampled:08/28/03 15:36 Received:09/02/03 16:20 Tert-butyl alcohol ND 5.0 ug/i 1 3090068 09/04/03 09/04/03 EPA 8260B Methyl Cert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 Surrogate:1,2-DCA-d4 85% 60-140 U-11 (5309067-12)Water Sampled:08/28/03 17:04 Received:09/02/03 16:20 Tert-butyl alcohol ND 5.0 u9A 1 3090068 09/04/03 09/04/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 87% 60-140 " U-12(S309067-13)Water Sampled:08/28/03 17:37 Received:09/02/03 16:20 Tert-butyl alcohol 8.2 5.0 ug/1 1 3090068 09/04/03 09/04/03 EPA 8260E Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether 1.5 0.50 " Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 " Surrogate: 1.2-DCA-d4 88% 60-140 " Sequoia Analytical- Sacramento 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 17 of 29