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• AIV I EIV Inc <br /> Analytical& Environmental Chemistry <br /> LABORATORY CONTROL SAMPLES <br /> Method VOLATILE AROMATICS AND TPH AS GASOLINE BY GC/PID <br /> Date Aguired 09/03/99 <br /> Expressed as mass(ng) <br /> Amount Amount LCS %Rec <br /> Analyte Added Found Rec. Limits <br /> Methyl-tert-butyl Ether 40 45 113% 80-130 <br /> Benzene 20 20 102% 85-120 <br /> Toluene 20 21 103% 85-120 <br /> Ethylbenzene 20 20 100% 85-120 <br /> m,p-Xylenes 20 20 102% 85-120 <br /> o-Xylene 20 21 104% 85-120 <br /> TPH-Gasoline 1250 1230 98% 65-140 <br /> Surrogates LCS-8020M Batch ID 0903-04 <br /> a a,a-TFT-FID 101% 60-130 <br /> 4-BFB-FID 105% 55-150 <br /> 4-BFB-PID 104% 65-140 <br /> Surrogates LCS-GASOLINE Batch ID 0903-04 <br /> a,a,a-TFT-FID 101% 60-130 <br /> 4-BFB-FID 105% 55-150 <br /> 4-BFB-PID 104% 65-140 <br /> =Values outside of QC limits <br /> LCS Recovery 0 out of 7 outside limits — <br /> �3 i , <br /> l.m <br /> AA f 1 I i i <br /> I <br /> I I <br /> _1 III 1111 <br /> 455 RESERVATION ROAD, SUITE G ® MARINA, CA 93933 ® (831) 883-0123 • FAX(831) 883-0122 <br /> 9 fecycred paver Qc-LCS <br />