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404 N Wget lane <br /> Walnut Creek, CA 94598 <br /> Sequoia (925)98 %73 <br /> FAX(925)9$$-9673 <br /> 4 www sequolalabs corn <br /> Analytical <br /> Project Tosco <br /> Gettler Ryan,Inc -Dubllzn <br /> Project Number Tosco 4 4409 Reported <br /> 6747 Sierra Court Suite J 06-Feb-01 17 21 <br /> Dublin CA,9456$ Project Manager Deanna L Harding <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunut Units Level Result %REC L=ts RPD Lirnit Notes <br /> 3atch 1A24014-EPA 5030B(PIT] <br /> Prepared&Analyzed 25-Jan-01 <br /> [,CS(1A24014-BS2) 115 70 130 <br /> Z.e yl tert-butyl ether 574 2 o ugn SO 0 <br /> S9 3 500 119 50-150 <br /> surrogate Dibromofluoromeihane 500 102 50-250 <br /> surrogate 1 2 Dichloroethane-d4 51 2 <br /> Vlatnz Spike(1A24014-MS1) <br /> Source W101522-02 Prepared&Analyzed 24-Ian-01 <br /> gethyl cert-butyl ether 456 20 ug/l 500 ND 91 2 60-150 <br /> 54 4 50 0 109 50-150 <br /> Surrogate Dibromofluoromethane 50 0 92 0 50-150 <br /> Surrogate 1 2Dichloroethane-d4 46.0 it <br /> Source W101522-02 Prepared&Analyzed 24-Jan-01 <br /> Matrix 5pilte Dup {1A24014-MSDI) 104 60.150 13 1 25 <br /> Methyl cert-butyl ether 520 2 0 ug/l So 0 ND <br /> 5S 9 Soo 112 50-150 <br /> Surrogate Dtbromofluoromethane 940 50-150 <br /> Surrogate 1 2-Dtchloroethane-d4 470 <br /> Soo <br /> • <br /> Sequoia Analytical-Walnut Creek The results in this report apply 10 the samples analyzed to accordance with the chain of <br /> custody document.Tins analytical report must be reproduced in its entfrrety� <br /> Page 10 of 12 <br />