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�J 404 N.Wiget Lane <br /> ' <br /> Sequoia <br /> Walnut Geek,CA 94598 <br /> J y Ul (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www.sequoialabs.com <br /> Gettler Ryan,Inc.-Dublin Project: Tosco <br /> 6747 Sierra Court Suite 7 Project Number: Tosco# 11192 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 19-Dec-00 17:43 <br /> MTBE by EPA Method 8260A- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD - <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OL05015-EPA 5030B [P/TJ <br /> Blank(OL05015-BLK3) Prepared&Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether ND 2.0 ug/1 <br /> Surrogate:Dibromofluon,methane 49.0 50.0 98.0 50-150 <br /> LCS(OL05015-BS3) Prepared&Analyzed:08-Dec-00 <br /> Methyl tert-butyl ether 46.0 2.0 ug/1 50.0 92.0 70-130 <br /> Surrogate:Dibromofluommethane 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 /> Matrix Spike Dup(OL05015-MSDI) Source:W012070-03 Prepared:05-Dec-00 Analyzed:08-Dec-00 <br /> Methyl tett-butyl ether 65.0 2.0 ug/I 50.0 ND 130 60-150 3.13 25 <br /> Surrogate.Dibromofluoromethane 50.0 - 50.0 100 50-150 <br /> Sequoia 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 /> Page 5 of 6 <br />