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819 Sinker Ave Ste 8 lz� Sequoia Sacramento,CA 2195 Analytical FAX(916)921so1oa FAX seqoialaboom r Gettler-Ryan-Dublin h ,J Project Former Unocal 0187;Stockton,CA S302221 6747 Sierra Court,Ste J 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 _U-25(5302227-26)Water Sampled 02/05/03 10 50 Received 02/07/03 10 30 Tert-butyl alcohol SND 100 ugll 1 3020233 02/18/03 -02/19/03 _ EPA 8260B w Methyl tent-butyl ether ND 2 0 " Di-isopropyl ether ND 2 0 " Ethyl tent-butyl ether ND 2 0 Tert-amyl methyl ether ND 2 0 " Surrogate 1,1-DCA-d4 103 % 60-140 " U-26(5302221-27)Water Sampled 02/06/03 14 15 Received 02/07/03 10 30 Tert-butyl alcohol ND 300 ugA 1 3020288 02/20/03 02/20/03 EPA 8260E Methyl tert-butyl ether ND 2 0 " Di-isopropyl ether ND 2 0 Ethyl tent-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 " Surrogate 1,1-DCA-d4 110% 60-140 " NP-1-22(S302221-28)-Water Sampled 02/06/03 12 35 Received 02/07/03 10 30 Tert-butyl alcohol ND 100 ug/l 1 3020288 02/20/03 02/20/03 EPA 8260B Methyl tert-butyl ether ND 2 0 " Di-isopropyl ether ND 2 0 " Ethyl tert-butyl ether ND 2 0 " —Tert-amyl methyl ether=.- ND 2 4 Surrogate 1,1-DCA-d4 98% 60-140 " NP-1-65(S302221-29)Water Sampled 02/06/0313 25ReceiWA-02/07/03 10 30-- Tert-butyl alcohol_ __ -- ND _–T1000__ ugA- _10-- 3020288__02/20103 _ 02/20/03 EPA 82608__ Methyl ten-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 100% 60-140 " Sequoia Analytical - Sacramento The results in this repot t apply to the samples analyzed in accordance with the chain o custody document Unless otherwise stated results are reported on a wet weight basts This analytical report must be reproduced in its entirety Page 21 of 33