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�.� 404 N.Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> Analytical <br /> }y 1 (925)988-9600 <br /> Analytical FAX(925)9abs.co 3 <br /> www.sequoialabs.com <br /> Gettler Ryan,Inc.-Dublin Project: Tosco <br /> 6747 Sierra Court Suite J Project Number: Tosco#11192 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 20-Dec-00 10:57 <br /> MTBE Confirmation by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %oREC Limits RPD Limit Notes <br /> Batch OL05015-EPA 5030B [P/TJ <br /> Blank(OL05015-BLK*3) Prepared&Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether ND 2.0 ug/I <br /> Surrogate:Dibromofluoromethane 49.0 50.0 98.0 50-150 <br /> Surrogate:1,2Dichloroethane-d4 48.0 50.0 96.0 50-150 . <br /> LCS(OL05015-BS3) Prepared&Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether 46.0 2.0 ug/I 50.0 92.0 70-130 <br /> Surrogate:Dibromofluoromethane 48.0 50.0 96.0 50-150 <br /> Surrogate:1,2Dichloroethane-d4 48.0 50.0 96.0 50-150 <br /> Matrix Spike(OL05015-MSI) Source:W012070-03 Prepared:05-Dec-00 Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether 63.0 2.0 ug/1 50.0 ND 126 60-150 <br /> Surrogate:Dibromofluoromethane 51.0 50.0 102 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 48.0 50.0 96.0 50-150 <br /> Matrix Spike Dup(OL05015-MSD1) Source:W012070-03 Prepared:05-Dec-00 Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether 65.0 2.0 ug/1 50.0 ND 130 60-150 3.13 25 <br /> Surrogate:Dibromofluoromethane 50.0 50.0 100 50-150 <br /> Surrogate:1,2-Dichloroethane-d4 49.0 50.0 98.0 50-150 <br /> Sequoia Analytical-IVahlut 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 /> Page 5 of 6 <br />