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AMERICAN <br /> ANALYTICS LABORATORY QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No . 98065 <br /> Project Name SS# 171 Project No.. NIA <br /> Method Oxygenates (EPA 8260) AA Project No : A135171-32 <br /> Sample ID Matrix Spike Date Analyzed 11/30/99 <br /> Concentration 100 ug/L Date Reported 12/03/99 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (ug/L) (%) (ug/L) (%) (%) Range (%) <br /> DI-isopropyl Ether 150 150 160 160 6 50 - 150 <br /> Ethyl tert-Butyl Ether 145 145 146 146 1 50 - 150 <br /> Methyl tert-Butyl Ether 139 139 132 132 5 50 - 150 <br /> Tert-Amyl Methyl Ether 144 144 136 136 6 50 - 150 <br /> tert-Butanol 100 100 88 88 13 50- 150 <br /> i <br /> George Havahas <br /> Laboratory Director <br /> American Analytics a 9765 Eton Avenue Chatsworth, California 91311 <br /> Tel ( 8 -13 ) 908 5547 Fax ( 818 ) 998 - 7258 <br />