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Sequoia 819Stnto,CA 58 4 a1—W—N Sacramento, 92 99Wo + (916)921-9600 Analytical wwseq 6) labsco0 1 svww sequoialabs coin Gettler-Ryan-Dublin Project Fortner Unocal 0187,Stockton,CA 5302221 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 s Sequoia Analytical - Sacramento Reporting-_ -- Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-1 (S302221-02)Water Sampled 02/06/03 11 20 Received 0210710310.30 _ Tert-butyl alcohol ND 100 ugA 1 3020263 02/19/03 02/20/03 EPA 8260E - 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 0 " Surrogate 1,2-DCA-d4 103% 60-140 " U_-2 (S302221-03)Water Sampled 02/06/030935 Received 02/07/03 10.30' Tert-butyl alcohol ND 100 ugA 1 3020263 02/19/03 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 12-DCA-d4 104% 60-140 " -U-3 5302221=04 Water Sampled 02/06/0311 55 Received 02/07/03 10 30- '- Tert-butyl alcohol ND 100 ugA 1 3020263 02/19/03 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 0 " ,Surrogate 1,1-DCA-d4 101 % �60-140 `U=4(5302221=05)Water-=Sampled 02106103-10 10�Received 02/07/03 10 30 Tert-butyl alcohol T _ - T _ ND_ 100 ugA 1 3020263 02119103`^02/20/03 EPA 82608 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 0" " Surrogate 1,2-DCA-d4 105 % 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 an a wet weight bases This analytical report must be reproduced in its entirety Page 15 of 33