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1551 Industrial Roar! <br /> Sequoia San CMcs,C'007"232,96 <br /> (650)232.9600 <br /> FAX(650)232-9612 <br /> Analytical <br /> www.sequohilabs.com , <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(2) Sampled: 8/28/00 <br /> 6747 Sierra Court,Suite J Project Number: Unocal SS#11195/16500 So.Interstate I-5,Laffift fDeived: 8128/00 <br /> Dublin,CA 94568 Project Manager Deanna Hardin 9/14/00 <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Matrix Spike 0080149-MSI L008195-03 <br /> Methyl teat-butyl ether 8/31100 50.0 9.10 55.4 ug/l 60.0-140 92.6 <br /> Surrogate: 1,2 Dichloroethane-d4 50.0 48.3 76-0-114 96.6 <br /> Matrix Spike Du 0080149-MS&Dl L00819"3 <br /> Methyl tert-butyl ether 8/31/00 50.0 9.10 54.7 ug/l 60.0-140 91.2 25.0 1.52 <br /> Surrogate: 1.2Dichloroethane-& " 50.0 47.6 76.0-114 95.2 <br /> Sequoia Analytical-San Carlos •Refer to end of report for text of notes and definitions. <br /> Page 19 of 20 <br />