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819 Striker Ave Ste 8 Sequoia Sacramento,CA 95834 (916)92!-9600 Analytical FAX(916)921-0100 G van-Dublin Project Former Unocal 0187,Stockton,CA S211332 6747 Sierra Court,Ste J Project Number NIA Reported Dublin CA,94568 Project Manager Deanna L Harding 12/27/02 17 49 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento Reporting Dilution Batch Prepared Analyzed Method Notes Analyte Result Limit Units U-1 5211332-02 Water Sampled 11/05102 15 19 Received 11/12/02 09 45 Teri-butyl alcohol ND 100 u8A 1 2110265 11/18/02 11/19/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 Surrogate 1 2-DCA-d4 106% 60-140 " U-2 (S213332-03)Water Sampled 11/05/02 12 18 Received 11112/02 09.45 Tert-butyl alcohol ND 100 ug/1 1 2110282 11/19/02 11/19/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 Surr ate 1,1-DCA-d4 102 % 60-140 " U A11332-04 Water Sampled 11105/021536 Received 11/12/02 02 45 Tert-butyl alcohol ND 100 u9A 1 2110265 11/18/02 11/19/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 108% 60-140 U-4 J5211332-051 Water Sampled ]1105/02 14 45 Received 11/12/02 09 45 Tert-butyl alcohol ND 100 ug/l 1 2110265 11/18/02 11/19/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 " Ethyl teri ND 20-butyl ether Tert-amyl methyl ether ND 20 Surrogate 1,1-DCA-d4 95% 60-140 " I om Analytical-Sacramento The i esults 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 bases This analytical report must be reproduced in its entirety 17 of 41