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819 Striker Ave Ste 8 Sequoia Sacramento,CA 95834 (916)921-9600 Analytical FAX(916)921-0100 -Ryan-Dublin Project Former Unocal 0187,Stockton,CA 5211332 674 Sierra Court,Ste 7 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 Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-17 6211332- 8 Water Sam led ll/06/ 2 10 2 Received 11/12/02 09.45 Tert-butyl alcohol ND 100 ug/l 1 2110312 11/20/02 11/20/02 EPA 82608 Methyl tert-butyl ether ND 20 " It I. " " " Di-isopropyl ether ND 20 " It " " " " Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 " Surroeate 12-DCA-d4 112% 60-140 " U-78 5211332-1 Water Sampled 11/06/02 13 20 Receive 11/12/02 09 45 Teri-butyl alcohol ND ]00 ug/l 1 2110312 11/20/02 11/20/02 EPA 8260B Methyl tert-butyl ether ND 20 It II I. " Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 109% 60-140 " 5217332-20 Water Sam led 11/06102 12 55 Received- 11112/02 09 45 NNW Tert-butyl alcohol ND 100 ugfl 1 2110312 11/20/02 11/20/02 EPA 8260E Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Tcrt-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 117% 60-140 " U-20(5211332-211 Water Sampled 11/05/02 17 10 Received 11/12/02 09 45 Tert-butyl alcohol ND 100 u9A 1 2110282 11/19/02 11/19/02 EPA 8260B Methyl tert-butyl ether ND 20 " " " Di-isopropyl ether ND 20 It " " Ethyl tert-butyl ether ND 20 " " Tert-amyl methyl ether ND 20 It Surrogate 1,2-DCA-d4 101 % 60-140 " ota Analytical-Sacramento The i esults to 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 21 of 41