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L 404 N.Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)98&9600 <br /> FAX(925)988-9673 <br /> ,!:I) Analytical www.sequolalabs.com <br /> Gettler Ryan,Inc.-I►ublin Project: Tosco <br /> 6747 Sierra Court Shite J Project Number: Tosco#11192 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 08-Dec-00 09:13 <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-BLR:1) Prepared&Analyzed: 30-Nov-00 <br /> Methyl tert-butyl ether ND 2.0 ug/I <br /> Surrogate:Dibromofluoty methane 49.0 50.0 98.0 50.150 <br /> Blank(OK30024-BLI•:2) Prepared&Analyzed:O1-Dec-00 <br /> Methyl tert-butyl ether ND 2.0 ug/I <br /> Surrogate:Dibromofluorc 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/I <br /> Surrogate:DibromgJluorc methane 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/I 50.0 90.4 70-130 <br /> Surrogate:Dibromofluorc 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/I 50.0 98.6 70-130 <br /> Surrogate.Dibromofluorc methane 52.0 50.0 104 50-150 <br /> LCS(OK30024-BS3) Prepared&Analyzed:04-Dec-00 <br /> Methyl tert-butyl ether 56.1 2.0 ug/1 50.0 112 70-130 <br /> Surrogate:Dibromofluorc methane 53.0 1150.0 106 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:Dibromofluommethane 52.0 1150.0 104 50.150 <br /> Matrix Spike Dup(01:30024-MSDi) Source:W011449-07 Prepared&Analyzed:04-Dec-00 <br /> Methyl tert-butyl ether 54.8 2.0 ug/l 50.0 ND 110 60-150 18.1 25 <br /> Surrogate:Dibromofluorc methane 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 />