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i • <br /> AN EN Inc <br /> Analytical& Environmental Chemistry <br /> LABORATORY CONTROL SAMPLES <br /> Method VOLATILE AROMATICS AND TPH AS GASOLINE BY GC/PID <br /> Date Aqulred 09/05/99 <br /> Expressed as mass(ng) <br /> Amount Amount LCS %Rec <br /> Analyte Added Found Rec Limits <br /> Methyl-tert-butyl Ether 40 42 104% 80-130 <br /> Benzene 20 21 103% 85-120 <br /> Toluene 20 21 104% 85-120 <br /> Ethylbenzene 20 20 102% 85-120 <br /> m p-Xylenes 20 21 103% 85-120 <br /> o-Xylene 20 21 106% 85-120 <br /> TPH-Gasoline 1250 1,265 101% 65-140 <br /> Surrogates LCS-8020M Batch ID 0905-04 <br /> a,a,a-TFT-FID 99% 60-130 <br /> 4-BFB-FID 104% 55-150 <br /> 4-BFB-PID 104% 65-140 <br /> Surrogates LCS-GASOLINE Batch ID 0905-05 <br />• a,a,a-TFT-FID 88% 60-130 <br /> 4-BFB-FID 116% 55-150 <br /> 4-BFB-PID 107% 65-140 <br /> .W Values outside of QC limits <br /> LCS Recovery 0 out of 7 outside limits <br /> mmm.I ' I <br /> � 3 <br /> am mm nm <br /> l 1 P\A <br /> 7 <br /> 455 RESERVATION ROAD, SUITE G ®-MARINA, CA 93933 ® (831) 883-0123 e FAX(831) 883-0122 <br /> recycled pape QC-LCS <br />