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Sequoia $19 Striker Ave Ste 6 Sacramentoento. 9 (916)9292 1-96009600 FAX(9 2 1 6)Analytical www.sequoialabs.com I Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S309067 6747 Sierra Court,Ste.3 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-1 (S309067-02)Water Sampled: 08/29/03 12:30 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 0.50 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 86% 60-140 " U-2(S309067-03)Water Sampled:08/2910311:55 Received:09/0210316:20 Tert-butyl alcohol ND 5.0 ug/1 1 3090081 09/05/03 09/05/03 EPA 82608 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 92% 60-140 U-3 (5309067-04)Water Sampled:08/29/03 13:00 Received: 09/0210316:20 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 metbyl ether ND 0.50 Surrogate: 1,2-DCA-d4 85% 60-140 U4(S309067r05)Water Sampled:08/29/03 11:20 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 84% 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 15 of 29