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AMERICAN <br /> ANALYTICS LABORATORY QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No 84080 <br /> Project Name SS# 171 Project No NIA <br /> Method EPA 8020 (BTEX) AA Project No A135171-21 <br /> ' Sample ID Matrix Spike Date Analyzed 03/03/99 <br /> Concentration 20 ug/L Date Reported 03/09/99 <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 1597 80 1770 89 11 65 - 135 <br /> Ethylbenzene 1536 77 1686 84 9 77 - 123 <br /> Toluene 1516 76 1655 83 9 66 - 134 <br /> Xylenes 1514 76 1673 84 10 73 - 127 <br /> 1 <br /> 1 <br /> 4or Havallas <br /> La atory Director <br />