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AMERICAN <br /> ;ff <br /> ANALYTICS LABORATORY QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No 74953 <br /> Project Name SS #171 Project No N/A <br /> Method EPA 8020 (BTEX) AA Project No A135171-19 <br /> Sample ID Matrix Spike Date Analyzed 08/19/98 <br /> Concentration 20 ug/L Date Reported 09/17/98 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (ug/L) (%) (ug/L) (%) (%) Range (%) <br /> Benzene 150 75 125 63 17 65 - 135 <br /> Ethylbenzene 133 67 11 9 60 11 77 - 123 <br /> Toluene 127 64 11 6 58 10 66 - 134 <br /> Xylenes 137 69 11 9 60 14 73 - 127 <br />• eorg Havalias <br /> L a tory Director <br /> American Analytics • 9765 Eton Avenue Chatsworth California 91311 <br /> Tel ( 898 ) 998 - 5547 • Fax ( 818 ) 998 - 7258 <br />