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Sequoia 819 Sinker Sir Sacramento, 92 CA95834 (916)921-96%00w FAX 1 oo 6Analytical wwwsequoislabs om Gettler-Ryan-Dublin .Project Former Unocal 0187,Stockton,CA 5302221 6747 Sterna 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-9(S302221-10)Water Sampled 02/05/03 12 00 Received 02/07/03 10 30 Tert-butyl alcohol - ND 4 100 ug/1 - 1 3020233 02/18/03 02/38/03 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 98% 60-140 " U-10(5302221-11)Water Sampled 02/05/03 15 45 Received 02/07/03 10 30 T Tert-butyl alcohol ND 100 ug/l 1 3020233 02/18/03 02/18/03 EPA 8260B Methyl tert-butyl ether ND 2 0 " -Di-isopropyl ether ND 2 0 V " Ethyl ten-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 Surrogate 1,2-DCA-d4 85% 60-140 U-11 $302221-12 Water Sampled 02/06/03 15 30 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 1,2-DCA-d4 101 % 60-140 - `U-12 5302221=13 Wnter�SainLLled-02/06103 16 10=Received 02/07/03 l0 30---:-_ - `—` Tert,,butyl alcohol _ r - ND 100 ugn_ 1 3020263 02/19/03 02120103 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 1,2-DCA-d4 102% 60-140 " Sequoia Analytical -Sacramento The results to this report apply to the samples analyzed to accordance with the chain of custody document Unless otherwise staled i esults are reported on a wet weight basis This analytical report must be reproduced to its entirety Page 17 of 33