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819 Striker Ave Ste 8 <br /> Sequoia Sacramento 9295834 <br /> (916)92! 9604 <br /> Analytical a l FAX equoi 921.0100 <br /> £ www sequoialabs coin <br /> Adbk <br /> Gettler-Ryan-Petaluma Project Former Tosco 6981, Stockton,CA 5212553 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 01/08/03 17 07 <br /> Gasollne\BTEXIOxygenates 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 2120497-EPA 5030B JP/TJ <br /> Matrix Spike Dup(2120497-MSD1) Source 5212663-04 Prepared&Analyzed 12/31/02 <br /> Supragute 4-BFB Zb 6 ug/1 250 <br /> 106 60 140 <br /> Batch 3010010-EPA 5030B JP/TJ <br /> Blank(3010010-BLK1) Prepared&Analyzed 01/01/03 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 1 2-DCA-d4 308 250 123 60-140 <br /> W." <br /> agate Toluene-d8 259 250 104 60 140 <br /> rrogate 4-BFB 25 7 250 103 60-140 <br /> Laboratory Control Sample(3010010-BSI) Prepared&Analyzed 01/01/03 <br /> Benzene 12 2 050 ug/l 136 90 70 130 <br /> Toluene 75 5 050 834 91 70-130 <br /> Methyl tert-butyl ether 190 050 224 85 60-140 <br /> Sup rogate 12-DCA-d4 296 250 118 60 140 <br /> Suirogate Toluene d8 251 250 100 60-140 <br /> Surrogate 4-BF8 244 250 98 60-140 <br /> Matrix Spike(3010010-MSI) Source 5212733-01 Prepared 01/01/03 Analyzed 01/02/03 <br /> Benzene 12.3 050 ug/1 13 6 ND 90 70-130 <br /> Toluene 74 7 050 834 ND 90 70-130 <br /> Methyl tent-butyl ether 167 0 50 224 1 3 69 60-140 <br /> Surrogate 1 2-DCA-d4 288 25 0 115 60-140 <br /> Surrogate Toluene-d8 260 250 104 60-140 <br /> Surrogate 4-BFB 25 2 250 101 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analvzed to accordance with the chain of <br /> custadv document Unless otherwise stated results ar e r epos ted on a wet weight basis <br /> This analvtrcal i epor r nrust be reproduced to its entirety <br /> Page 8of10 <br />