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819 Stoker Ave Ste 8 � Sequoia Sacramento,CA 45834 (916)921-9600 Analytical FAX(916)921-01QO Ryan-Dublin Project Former Unocal 0187,Stockton,CA S211332 67 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-9 S211332-10 Water Sampled 11/06/020800 Received 11/12/02, 09 45 Tert-butyl alcohol ND 100 ug/l 1 2110312 11/20/02 11/20102 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 118% 60-140 U-10 S211332-1 11 Water Sampled 11/061020840 Received 11/12/02 02.45 Tert-butyl alcohol ND 300 usA 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 20 Tert-amyl methyl ether ND 20 " Surrogate 1,2-DCA-0 114 % 60-140 211332-12 Water Sampled 11/06/02 10 48 Received- 11/12/02 09 45 Tert-butyl alcohol ND 100 ug/1 1 2110312 11/20/02 11/20/02 EPA 8260B Methyl tert-butyl ether ND 20 Di-isopropyl ether ND 70 " Ethyl tert-butyl ether ND 20 Ter(-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 118% 60-140 " U-1 2 (S211332 13)Water Sampled 11/06/02 11 25Received- 1112102 09 45 _ Tert-butyl alcohol ND 100 ug/i 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 20 Tert-amyl methyl ether ND 20 " Surrogate 1,1-DCA-d4 115% 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 19 of 41