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AMERICAN � <br /> ANALYTICS LABORATORY QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No 67480 <br /> Project Name. SS #171 Project No N/A <br /> Method EPA 8020 (BTEX) AA Project No A135171-17 <br /> Sample ID Matrix Spike Date Analyzed 02/18/98 <br /> Concentration 20 ug/L Date Reported 03/03/98 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (ug/L) N (ug/L) (%) N Range (%) <br /> Benzene 1715 86 1689 84 2 65- 135 <br /> Ethylbenzene 1719 86 1666 83 4 77- 123 <br /> Toluene 1719 86 1699 85 1 66- 134 <br /> Xylenes 1732 87 1674 84 4 73- 127 <br />• G or <br /> Navalias <br /> La 4G <br /> Director <br /> American Analytics • 9765 Eton Avenue, Chatsworth, California 91311 <br /> Tel ( 818 ) 998 - 5547 • ( 800 ) 533 - 8378 • Fax ( 818 ) 998 - 7258 <br />