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Sequoia 819 Striker Ave Ste 8 Sacramento,CA 95834 16) 1W Analytical (9uoiala -9600 FAX(916)921-0100 www.sequoialabs_com Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA 5309067 6747 Sierra Court,Ste.J 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-17(5309067-18)Water Sampled:08/29/03 12:06 Received:09/02/03 16:20 Tert-butyl alcohol ND 5.0 ug/l 1 3090075 09/05/03 09/05/03 EPA 8260E 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-DCA44 81 % 60-140 " U-18(S309067-19)Water Sampled:08/29/03 11:02 Received: 09/02/0316:20 Tert-butyl alcohol ND 5.0 ug/l 1 3090075 09/05/03 09/05/03 EPA 8260B Methyl tent-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-19(5309067-20)Water Sampled:08/29/03 10:30 Received: 09/02/03 16:20 Tert-butyl alcohol ND 5.0 ug/l 1 3090075 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: 1,1-DCA-d4 103 % 60-140 " U-20(5309067-21)Water Sampled: 08/28/03 19:36 Received:09/02/03 16:20 'Pert-butyl alcohol 12 5.0 ugA 1 3090068 09/04/03 09/04/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether 2.2 0.50 Ethyl tent-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 83 % 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 trust be reproduced in its entirety. Page 19 of 29