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AMEWCAN <br /> ANALYTICS LABORATORY„QA/QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA 1D No 87990 <br /> Protect Name SS# 171 Project No N/A <br /> Method EPA 8020 (BTEX) AA Project No A135171 22 <br /> Sample ID Matrix Spike Date Analyzed 05/18/99 <br /> Concentration 20 ug/L Date Reported 05/21/99 <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 1958 98 1871 94 4 65 - 135 <br /> Ethylbenzene 1902 95 1867 93 2 77 - 123 <br /> Toluene 2011 101 1893 95 6 66 - 134 <br /> Xylenes 1903 95 1880 94 1 73 - 127 <br /> seor a Havallas <br /> L atory Director <br />