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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,)9 95834 -- <br /> (9l6}921 9600 <br /> a_ )-Analytical FAX(916)921 0100 <br /> www sequoialabs cum <br /> SECOR international-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/02 11 28 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B -Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source °/uREC RPD <br /> Analyte Result Linut Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060131 -EPA 5030B[P/TI <br /> Matrix Spike Dup(2060131-MSD1) T Source 5206140-06 Prepared 06/12/02 Analyzed 06/13/02 <br /> Methyl tert-butyl ether 00400 00050 mg/kg 00436 ND 92 60-140 4 25 <br /> Benzene 00271 00050 00268 ND 101 60 140 3 25 <br /> Toluene 0 174 00050 0 162 ND 107 60-140 6 25 <br /> Gasolme(C6-C10) 200 10 220 ND 91 60-140 5 25 <br /> Surrogate 12-DC4-d4 00469 00500 94 60-140 <br /> Surrogate Toluene-d8 00509 00500 102 60-140 <br /> Surrogate 4-BFB 00530 00500 106 60-140 <br /> Sequoia Analytical- Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 9 of 12 <br />