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819 Striker Ave Ste 8 Sequoia Sacramento, 95834 92(916)921-960D 4D FAX 921-0100 Analytical www.sequoialabs.com Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S309067 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-13(S309067-14)Water Sampled:08/28/03 18:06 Received:09/02/03 16:20 Tert-butyl alcohol 5.9 5.0 ugll 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 92% 60-140 " U-14(5309067-15)Water Sampled:08/28/03 10:46 Received:09/02/03 16:20 Tert-butyl alcohol ND 5.0 ug/[ 1 3090068 09/04/03 09/04/03 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 " S te: 1,2-DCA-d4 109% 60-140 " U-1 S309067-16)Water Sampled:08/28/03 11:11 Received:09/02/03 16:20 ' 'Pert-butyl alcohol ND 5.0 ug/l 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 92% 60-140 " U-16(5309067-17)Water Sampled:08/29/03 11:34 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 85% 60-140 " i I $ is 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. i This analytical report must be reproduced in its entirety. I Page 18 of 29 '