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AMERICAN f <br /> m V <br /> LABORATORY QA/QC REPORT ' <br /> ANALYTICS - <br /> Page <br /> 1 I <br /> ANALYTICS <br /> Thrifty Oil Company AA ID No 97852 <br /> Project Name, SS #472 Project No NIA <br /> Method- Oxygenates (EPA 8260) AA Project No A135172-31 <br /> Sample 10, Matrix Splice Date Analyzed 11/24/99 <br /> Concentration 100 ug/L Date Reported- 12/01/99 <br /> Spike Dup Spike/Dup. <br /> Result Recovery Result Recovery HPD Accept.Rec <br /> Compounds (ug/L) (%) OWL.) (%) (%) Range (%) <br /> DI-Isopropyl Ether 95 95 98 98 3 50- 150 <br /> Ethyl Cert-Butyl Ether 74 74 80 80 8 50-150 <br /> Methyl tert-Butyl Ether 81 81 84 84 4 50- 150 <br /> Teri-Amyl Methyl Ether 68 68 82 82 19 50 - 150 <br /> tert-Butanol 84 84 85 85 1 50- 150 <br /> • <br /> i <br /> ! I <br /> i <br /> i <br /> George Havallas <br /> Laboratory Director i <br /> American Analytics 9765 Eton Avenue Chatsworth California 91311 <br />