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819 Straker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4 (916) <br /> 921-9600 <br /> Analytical www <br /> 9Z1-0100 <br /> sequoialabs corn <br /> i <br /> Gettler-Ryan-Petaluma Project Former Tosco 6981,Stockton,CA 5209465 <br />----1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 10/04/02 17 48 <br /> Gasoline1BTEX\Oxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100028-EPA 5030B [P/TJ <br /> Matrix Spike Dup(2100028-MSDI) Source 5209464-01 Prepared&Analyzed 10/02/02 <br /> Benzene 150 0 50 ug/l 13 4 ND 112 70-130 0 7 25 <br /> Toluene 832 0 50 81 0 ND 103 70-130 0 25 <br /> Methyl tent-buty]ether 916 0 50 21 8 58 154 60-140 9 25 QM-07 <br /> Gasoline(C6-C10) 1070 50 1100 ND 93 60-140 0 25 <br /> Surrogate 12-DCA-d4 23 7 250 95 60-140 <br /> Surrogate Toluene-d8 244 250 98 60-140 <br /> Surrogate 4-BFB 253 250 101 60-140 <br /> i <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> custody document This analytical report must be reproduced to its entirely <br /> Page 5 of 6 <br />