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819 Striker Avenue Suite 8 <br /> 1 <br /> Sequoia <br /> _f <br /> Sacramento C2 95834 <br /> 1, 1[.� (916)921-96D0 <br /> FAX(916)921-0100 <br /> �Qr 0 <br /> Analytical <br /> www sequolalabs corn <br /> j-] Y a <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5211676 <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 12/09/02 14 19 <br /> GasohnelBTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-7(5211676-01)Water Sampled 11/21/02 10 08 Received 11/21/02 14 25 <br /> Benzene 220 5 0 ug/l 10 2120101 12/05/02 12/05/02 EPA 8260B <br /> Toluene 290 5 0 <br /> Ethylbenzene 84 5 0 " <br /> Xylenes(total) 1300 5 0 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Gasoline(C6-C10) 7800 500 HC-12 <br /> Surrogate 12-DCA-d4 92% 60-140 <br /> Surrogate Toluene-d8 91 % 60-140 " <br /> Surrogate 4-BFB 85 % 60-140 " <br /> MW-16(5211676-02)Water Sampled 11/21/02 10 19 Received 11/21/02 14 25 <br /> Benzene 120 050 ug/1 1 2120101 12/05/02 12/05/02 EPA 8260B <br /> Toluene 13 050 <br /> Ethylbenzene 23 050 <br /> Xylenes(total) 39 050 <br /> Methyl tert-butyl ether 160 050 " E <br /> Gasoline(C6-C10) 790 50 HC-12 <br /> Surrogate 12-DC,4-d4 116% 60-140 <br /> Surrogate Toluene-d8 104% 60-140 <br /> Surrogate 4-BFB 120% 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzer/in accordance with the chain <br /> custody document This analytical report must be reproducer)to its entirety <br /> Page 3 of 6 <br />