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_� '1 <br /> 819 Striker Avenue Suite 8 <br /> 1 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> /� y.*alp corn tical www sequolalabs <br /> 1`- 11 yS <br /> Gettler Ryan-Petaluma Project Tosco 6981,Stockton, CA 5210530 <br /> 1364 N McDowell Blvd Ste B2 Project Numher NIA Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 11/07/02 16 03 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Motes <br /> VW-7(S210530-01)Water Sampled 10/21/02 10 54 Received 10/21/02 15 10 <br /> Benzene 180 25 ug/l 50 2100435 10/29/02 10/29/02 EPA 8260B <br /> Toluene 290 25 <br /> Ethylbenzene 130 25 <br /> Xylenes(total) 1800 25 " <br /> Methyl tert-butyl ether ND 25 " <br /> Gasoline(C6-C10) 8400 2500 <br /> Surrogate 12-DCA-d4 98% 60-140 <br /> Surrogate Toluene-d8 94% 60-140 <br /> Surrogate 4-BFB 92% 60-140 <br /> MW-16(5210530-02)Water Sampled 10/21/02 11 01 Received 10/21/02 15 10 <br /> Benzene 51 5 0 ugl] t0 2100443 10/29/02 10/30/02 EPA 8260B <br /> Toluene ND 5 0 <br /> Ethythenzene 6 9 5 0 • <br /> Xylenes(total) 5 2 5 0 " <br /> Methyl tent-butyl ether 99 5 0 <br /> Gasoline(C6-C10) ND 506 <br /> Suri agate 12-DCA-d4 98% 60-140 <br /> Surrogate Toluene-d8 112% 60-140 " <br /> Surrogate 4-BFB 102% 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its enirrety <br /> Page 3 of 8 <br />