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AMERICAN <br /> sp <br /> ANALYTICS LABORATORY QA QC REPORT <br /> Page 1 <br /> Client Thrifty Oil Company AA ID No 60762 <br /> Project Name SS #171 Project No N/A <br /> Method EPA 8020 (BTEX) AA Project No A135171-15 <br /> Sample ID Matrix Spike ,Gate Analyzed 08/20/97 <br /> Concentration 20 ug/L Date Reported 09/18/97 <br /> Spike Dup Spike/Dup <br /> Result Recovery Result Recovery RPD Accept Rec <br /> Compounds (uglL) N (ug/L) N (°io) Range (%) <br /> Benzene 1770 89 1845 92 3 65 - 135 <br /> Ethylbenzene 1846 92 1933 97 5 77 - 123 <br /> Toluene 1882 94 1933 97 3 66 - 134 <br /> Xylenes 1873 94 1740 87 8 73 - 127 <br /> Georo Navallas <br /> Laboratory Director <br /> American Analytics a 9765 Eton Avenue Chatsworth California 9 13 11 <br /> Tel ( 818 ) 998 - 5547 a ( 800 ) 533 - 8378 a Fax ( 818 ) 998 - 7258 <br />