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404 N.Wlget Lane <br /> Sequoia Walnut Creek,CA <br /> 94598 <br /> (925)988-9600-9600 <br /> FAX(925)988-9673 <br /> Analytical www.sequolafabs.com <br /> Gettler Ryan,Inc.-Di blip Project: Tosco <br /> 6747 Sierra Court Suite J Project Number: Tosco# 11192 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 12-Dec-0017:18 <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 OK30024-EPA 5030B [P/TJ <br /> Blank(OK30024-BLK 1) Prepared&Analyzed:30-Nov-00 <br /> Methyl tert-butyl ether ND 2.0 ug/1 <br /> Surrogate:Dibromofluoro nethane 49.0 50.0 98.0 50-150 <br /> Blank(OK30024-BLK2) Prepared&Analyzed:01-Dec-00 <br /> Methyl tert-butyl ether ND 2.0 ug/I <br /> Surrogate:Dibromofluoro methane 52.0 50.0 104 50-150 <br /> Blank(OK30024-BU 3) Prepared&Analyzed:04-Dec-00 <br /> Methyl tert-butyl ether ND 2.0 ug/1 <br /> Surrogate:Dibromofluorcmethane 52.0 50.0 104 50-150 <br /> LCS(OK30024-BSI) Prepared&Analyzed:30-Nov-00 <br /> Methyl tert-butyl ether 45.2 2.0 ug/1 50.0 90.4 70-130 <br /> Surrogate:Dibromofluon)methane 49.0 50.0 98.0 50-150 <br /> LCS(OK30024-BS2) Prepared&Analyzed:01-Dec-0O <br /> Methyl tert-butyl ether 49.3 2.0 ug/1 50.0 98.6 70-130 <br /> Surrogate:Dibromofluornmethane 52.0 50.0 104 50-150 <br /> LCS(OK30024-BS3) Prepared&Analyzed:04-Dec-00 <br /> Methyl tent-butyl ether 56.1 2.0 ug/l 50.0 112 70-130 <br /> Surrogate:Dibromofluorgmethane 53.0 11 50.0 106 50-150 <br /> Matrix Spike(OK30024-MSI) Source: W011449-07 Prepared&Analyzed:04-Dec-00 <br /> Methyl tert-butyl ether 45.7 2.0 ug/I 50.0 ND 91.4 60-150 <br /> Surrogate:Dibromofluoromethane 52.0 11 50.0 104 50.150 <br /> Matrix Spike Dup(OK30024-MSD1) Source:W011449-07 Prepared&Analyzed:04-Dec-00 <br /> Methyl tert-butyl ether 54.8 2.0 ug/1 50.0 ND 110 60-150 18.1 25 <br /> Surrogate:Dibromofluotomethane 53.0 50.0 106 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 />