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819 Striker Ave Ste 8 Sequoia Sacramento,CA 95834 (9]6)921-9500 Analytical FAX(916)921-0100 -Ryan-Dublin Project Former Unocal 0187,Stockton,CA 5211332 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 Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-25 5211332-26 Water Sam led 11/06/02 07 16 Received 11/12/02 09 45 Tert-butyl alcohol ND 100 ugfl 1 2110312 11/20/02 11/20/02 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether ND 20 " Surroeate 12-DCA-d4 115 % 60-140 " U-26 5211332-27 Water Sampled 11/06/02 13 58 Rec ived: 11/12/02 02 45 Text-butyl alcohol ND 100 ug/1 1 2110312 11120/02 11/20/02 EPA 8260E Methyl text-butyl ether ND 20 It " Di-isopropyl ether ND 20 " " " " " Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 Surrogate 1,2-DCA-d4 129% 60-140 " 22 5211332-28 Water Sam led 11/06/02 16.51 Received 11112/02 09 45 NOW Tert-butyl alcohol ND 100 ug/11 2110312 11120!02 11120102 EPA 8260E Methyl tent-butyl ether ND 20 Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 2 0 ` Surrogate 1,2-DCA-d4 122% 60-140 " NP-1-65(S211332-29)Water Ssmeled 11/06/02 17 25 Received 11/12/02 09 45 Tert-butyl alcohol ND 100 ugll 1 2110312 11/20/02 11/20/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 2 0 Ethyl tert-butyl ether ND 2 0 Tert-amyl methyl ether ND 2 0 Surrogate 1,2-DCA-d4 118% 60-140 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 This analytical report Must be reproduced in its entirety 23 of 41