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819 Stnker Ave Ste 8 G) 958Sacramento, -96 Sequoia (916)92 921-9600 34FAX Analytical wwseq 6ialabs om www soquoiafabs com Gy an-Dublin Project Farmer Unocal 0187,Stockton,CA 5302221 6747 terra Court,Ste 3 Project Number N/A Reported Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes 3-13 5302221-14 Water Sampled 02/06/03 16 35 Received 02/07/03 10 30 Cert-butyl alcohol ND 100 ugA 1 3020263 02/19/03 02/20/03 EPA 8260B Acthyl tert-butyl ether ND 20 3t-isopropyl ether ND 20 ?thyl tert-butyl ether ND 2 0 cert-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 100% 60-140 " U-14 S30222 1-1 n Water Sam led 02/06/03 09 00 Received 02/07/03 10 30 Tert-butyl alcohol ND 100 ug/l 1 3020263 02/19/03 02/20103 EPA 8260B Methyl tert-butyl ether ND 2 0 n Di-isopropyl ether ND 20 „ Ethyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 Surrogate 1,2-DCA-d4 104% 60-140 U- 302221-16 Water Sampled 02/061030830 Received 02/07/03 10 30 TeWyl alcohol ND 100 USA 1 3020263 02/19/03 02/20/03 EPA 8260B " Methyl cert-butyl eater ND 20 Di-isopropyl ether ND 2 0 Ethyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether ND 20 " Surrogate 1,2-DCA-d4 105% 60-140 " U-16 5302221-1 Water Sampled 02/04/03 15 25 Received 02/07/03 10 30 Tert-butyl alcohol ND 100 ugA 1 3020220 02/18/03 02/18/03 EPA 8260B Methyl tert-butyl ether ND 2 0 Di-isopropyl ether ND 2 0 " „ Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 2 0 Surrogate 1 2-DCA-d4 118% 60-140 " 1a Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stared results are reported on a wet weight basis This analytical i eport must be reproduced in its entirety Page 19 of 33