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404 N Wiget lane <br /> Walnut Geek CA 94598 <br /> Sequoia (925)988-9600 <br /> IDFAX(925)988-9673 <br /> jwAnalytical www sequoWabs 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 29-Dec-00 16 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 %RFC Limits RPD Limit Notes <br /> Batch OLIS005-EPA 5030B [PIT] <br /> Blank(OL18005-BLK2) Prepared&Analyzed 20-Dec-00 <br /> Methyl text-butyl ether ND 20 ug/1 <br /> Surrogate Dibromolluoromethane 460 500 920 50-150 <br /> LCS(OL18005-BS2) Prepared&Analyzed 20-Dec-00 <br /> Methyl ted-butyl ether 410 20 ugli 500 820 70-130 <br /> Surrogate Dibromofluornmethane 460 500 920 50-150 <br /> Matrix Spike(OL18005 MS1) Source W012447-02 Prepared&Analyzed 20-Dec-00 <br /> Methyl text-butyl ether 730 20 ug/1 500 25 960 60-150 <br /> Surrogate Dtbromofluoromethare 48.0 500 960 50-150 <br /> Matrix Spike Dup (OL18005-MSD1) Source W012447-02 Prepared&Analyzed 20-Dec-00 <br /> yl text-butyl ether 720 20 ug/l 500 25 940 60-150 138 25 <br /> INFrogate Dibromofluoromethane 48.0 500 960 50-150 <br /> pia 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 enterety <br /> Page 5 of 6 <br />