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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)uoiala -0100 <br /> www.sequoialabs.com <br /> labs,com <br /> Gettler-Ryan-Petaluma Project: Tosco 11195,Lathrop,CA 5212401 <br /> 1364 N McDowell Blvd.Ste B2 Project Number. N/A Reported: <br /> Petaluma CA,94954 Project Manager: Jed Douglas 12/31/02 12:52 <br /> GasolinelBTEXl4xygenates 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 2120307-EPA 5030B [P/T] <br /> Matrix Spike Dup(212030'1-MSD1) Source: 5212401-04 Prepared: 12/18/02 Analyzed: 12/19/02 <br /> Benzene 0.0197 0.0050 mg/kg 0.0272 ND 72 60-140 0 25 <br /> Toluene 0.135 0.0050 0.167 ND 81 60-140 18 25 <br /> Methyl tert-butyl ether 0.0459 0.0050 0.0448 ND 102 60-140 36 25 QR-02 <br /> Gasoline(C6-C10) 1.59 1.0 " 2.20 ND 72 60-140 25 25 <br /> Suprogate:l,1-DC4-d4 0.0514 0.0500 103 60-140 <br /> Surrogate:Toluene-d8 6.0514 0.0500 105 60-140 <br /> Surrogate:4-BFB 0.0476 0.0500 95 60-140 <br /> The results in this re orl apply to the samples anal y2ed in accordance with the chain o ' <br /> Sequoia Analytical-Sacramento n pp y p } f �� �• <br /> cusiodp document. Unless otherwise stated,resells are reported on a wet weight basis. <br /> Tliis mzalytical report must be reproduced in ils entirely. <br /> Page 6 of 7 <br />