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AMERICAN! ` <br /> ALYTICS LABORATORY QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No 92806 <br /> Project Name SS# 172 Project No • N/A <br /> Method EPA 8020 (BTEX) AA Project No A135172-30 <br /> Sample ID Matrix Spike Date Analyzed 08/24/99 <br /> Concentration 20 ug/L Date Reported 08/27/99 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (ug/L) N (ug/L) N N Range (%) <br /> Benzene 2015 101 206 103 2 65- 135 <br /> Ethylbenzene 1986 99 192 96 3 77- 123 <br /> Toluene 1986 99 199 100 1 66- 134 <br /> Xylenes 2062 103 200 100 3 73 - 127 <br />• <br /> George Havallas <br /> Laboratory Director <br />