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AMERICAN <br /> m <br /> LABORATORY OAZQC REPORT <br /> A1+IALYTICS <br /> Client: Thrifty Oil Company Sample Matrix: Water <br /> Method: EPA 8020 (BTEX) , QC, Spike Date Analyzed: 6/12/92 <br /> AA Project No. : A135172-1 Date Reported: 6/22/92 <br /> Spike Spike/Duplicate <br /> Compounds Recovery Recovery RPD <br /> ($) (%) M <br /> Benzene 92 82 10.3 <br /> Toluene 94 84 11.2 <br /> Ethyl Benzene 95 83 13 <br /> Total Xylenes 92 81 12.7 <br /> RPD = Relative Percent Diff/tjmerence, 100( (x, - x2)/t <br /> (XI ~+~x2)/2 ; ]yyV y <br /> Larry L. Schale er, Ph. D. <br /> Laboratory Director <br /> ff/tjm <br /> American Analytics • 9765 Eton Avenue, Chatsworth, California 91311 <br /> Tel ( 818 ) 998 - 5547 + ( 800 ) 533 - 8378 • Fax ( 818 ) 998 - 7258 <br />