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819 Striker Ave Ste S Sequoia Sacranxnto. 92 9534 FAX(916)921-0100 Analytical www.sequoialabs.e:om Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA 5306048 6747 Sierra Court,Ste.1 Project Number: NIA Reported: Dublin CA,94568 Project Manager. Deanna L.Harding 06/16/03 15:43 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-17 S306048-18 Water Sampled:05/28/0314:35 Received:06/02/0313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060093 06/05/03 06/06/03 EPA 8260E Methyl tert-butyl ether ND 0.50 " •' " " " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Teri-amyl methyl ether ND 0.50 Surrogate:1,2-DC444 112% 60-140 " U-18 S306048-19 Water -Sampled:05/2810311:55 Received:0610210313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tert-butyl ether 0.89 0.50 " Di-isopropyl ether 0.59 0.50 Ethyl tent-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 " Surrogate:1,1-DCA-d4 114% 60-140 U-19 S306048-20 Water Sampled:05/28/0310:35 Received:06/0210313:40 Tert-butyl alcohol ND 5.0 ug/1 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tert-butyl ether 1.3 0.50 " Di-isopropyl ether 0.96 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 117% 60-140 " U-20 5306048-21 Water Sampled:05129/0314:35 Received:06/0210313:40 Tert-butyl alcohol 22 5.0 ugA 1 3060110 06/06/03 06/06/03 EPA 8260E Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether 0.62 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate:1,2-DCA44 115% 60440 " Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain custody document. Unless otherwise stated,results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. Page 19 of 32