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Sequoia 404 N wtget Lane <br /> Walnut Creek, CA 94598 <br /> Analytical FAX(925) 988-9673 <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Protect Number Tosco# 6981 Reported <br /> in <br /> Dublin CA,94568_ - __ -_ _ _ - _- -Project Manager_Deanna L Hard — -- p <br /> 1 g B-= 10-Feb-00 1 100 <br /> -- Volatile Organic Compounds by EPA-Method 8260A - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Lima Units Level Result %REC Limits RPD L►mtt Notes <br /> Batch OB02018: Prepared 01-Feb-00 Using EPA 5030B /T <br /> Matrix Spike(OB02018-MSI) Source W001654-02 <br /> Methyl tert-butyl ether 464 20 ugn 500 30 868 60-150 <br /> Surrogate Dibromofluoromethane 500 Soo 100 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 550 500 110 50-150 <br /> Matrix Spike Dup(OB02018-MSDI) Source W001654-02 <br /> Methyl tert-butyl ether 514 20 ugli 500 30 968 60-150 102 25 <br /> Surrogate Drbromofluoromethane 510 500 102 50-150 <br /> Sui rogate 1 2-Drchloroethane-d4 570 500 114 50-150 <br /> • <br /> Sequoia Analytical - Walnut Creek The i exults in Ons report apply to Ase samples analyzed in accordance with dw chein ofcu <br /> document Ths analyawl repot must be reproduced in is enc <br /> 1 <br /> Alan B Kemp,LaboratoryDirector Page 19 of 20 <br />