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AMERICAN <br /> ;ff <br /> ANALYTICS LABORATORY QA QC REPORT <br /> Page i <br /> Client Thrifty Oil Company AA ID No 85951 <br /> Project Name SS# 172 Project No NIA <br /> Method EPA 8020 (BTEX) AA Project No A135172-26 <br />' Sample ID Matrix Spike Date Analyzed 04/07/99 <br /> Concentration 20 ug/L Date Reported 04/13/99 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (ug/L) (%) (ug/L) N N Range (%) <br /> Benzene 2064 103 183 92 11 65 - 135 <br /> Ethylbenzene 2086 104 212 106 2 77 - 123 <br /> Totuene 2052 103 21 2 106 3 66 - 134 <br /> Xylenes 2275 114 21 6 108 5 73 - 127 <br /> George Havalias <br /> Laboratory Director <br />