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819 Striker Ave Ste 8 Sequoia 5acrxrnetrto,CA9585834 (910)9269600 Analytical ww-se uoiala -0100 www.sequai alabs.aotn -Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 7 Sierra Court,Ste.7 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-21 S306048-22 Water Sampled:05129/03 15:20 Received:06/02/0313:40 Tert-butyl alcohol 23 5.0 ugA 1 3060110 06/06/03 06/06/03 EPA 8200B Methyl tert-butyl ether ND 0.50 Dl-isopropyl ether 1.2 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 123% 60-140 U-22(S306048-23)Water Sampled:05/27/03 12:25 Received:0610210313:40 - Tert-butyl alcohol ND 5.0 ug/l 1 3060057 06/04/03 06/04/03 EPA 8260E 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 Ill % 60-140 " LigK(S306048-24)Water Sampled: 0512710313:00 Received:06/0210313:40 utyl alcohol ND 5.0 ugA 1 3060057 06/04/03 06/04/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tent-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 116% 60-140 " U-24 (5306048-25)Water Sampled:05/29/03 13:45 Received:06/02/03 13:40 Tert-butyl alcohol ND _ 5.0 ugh 1 3060110 06106/03 06/06/03 EPA 826013 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 126% 60-140 " oia Analytical- Sacramento The results in this report apply to the samples analwed 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. Page 20 of 32 1