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819 Striker Ave Su 8 Sequoia �� 6>9 95834 FAX(916)92"100 Analytical www.m quoialabs.corn Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA 5306048 6747 Sierra Court,Ste.J Project Number. N/A 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-1 5306048-02 Water Sampled:0512910316:05 Received:06/0210313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 88% 60-140 " U-2 S306048-03 Water Sampled:05/2910316:30 Received:06/02/0313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Ten-amyl methyl ether ND 0.50 " Surrogate:1,2-DCA-d4 92% 60-140 " U-3 S306048-04 Water Sampled: 05/30/03 08:45 Received: 06102/0313:40 Tert-butyl alcohol ND 5.0 ug/1 1 3060167 06/11/03 06/11/03 EPA 8260$ Methyl ter[-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 ` Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 108% 60-140 " U-4 S306048-05 Water Sampled: 05/30/03 09:20 Received: 06/02/03 13:40 Tert-butyl alcohol ND 5.0 ug/I 1 3060167 06/11/03 06/11/03 EPA 8260B Methyl tent-butyl ether ND 0.50 Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate:1,1-DCA-d4 101 % 60-140 " Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain o custody document. Unless otherwise stated,results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. Page 15 of 32