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S@ql101a N.Wiget Lane <br /> Cr <br /> Walnut Creek,CA 94598 <br /> Analytical (925)988-9600 <br /> FAX(916)9$8-9673 <br /> www.sequoialabs.com <br /> r.;ler Ryan,Inc.-Dublin Project: Tosco <br /> <•,f�-?7 Sierra Court Suite J Project Number: Tosco# 11195 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 14-Jun-02 09:37 <br /> Gasoline\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 2060079-EPA 5030B [P/TJ <br /> Matrix Spike Dup(2060079-MSDI) Source:W206020-01 Prepared&Analyzed:07-Jun-02 <br /> Methyl tent-butyl ether 0.0423 0.0050 mg/kg 0.0436 ND 94 60-140 3 25 <br /> Benzene 0.0271 0.0050 0.0268 ND 100 60-140 2 25 <br /> Toluene 0.174 0.0050 0.162 ND 107 60-140 3 25 <br /> Gasoline(C6-C10) 1.95 1.0 2.20 ND 89 60-140 5 25 <br /> Surrogate.'1,2-DCA-d4 0.0491 0.0500 98 60-140 <br /> Surrogate:Toluene-d8 0.0512 0.0500 102 60-140 <br /> Surrogate:4-BFB 0.0559 0,0500 112 60-140 <br /> Ss Sia Analytical-Walnut Creek The results in 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 /> i <br /> Page 6 of 7 <br />