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S <br /> AIV I EN Inc <br /> Analytical & Environmental Chemistry <br />' LABORATORY CONTROL SAMPLES <br /> Method VOLA TILE AROMATICS AND TPH AS GASOLINE BY GC/PID <br /> Date Agwred 03/20/98 <br /> Expressed as mass(ng) <br />' Amount Amount LCS %Rec <br /> Analyte Added Found Rec Umits <br /> Methyl-tert-butyl Ether 40 37 93% 83-123 <br />' Benzene 20 21 106% 89-111 <br /> Toluene 20 22 110% 89-113 <br /> Ethylbenzene 20 21 106% 87-113 <br />' m p-Xylenes 20 21 105% 88-118 <br /> o-Xylene 20 21 107% 86-115 <br /> TPH-Gasoline 1250 353 28% 6&138 <br />' Surrogates LSC-8020M Batch ID 0320-04 <br /> a a,a-TFT-FID 107% 58-127 <br /> 4-BFB-FID 107% 55-151 <br />' 4-BFB-PID 108% 68-137 <br /> Surrogates LSC-GASOLINE Batch ID 0320-04 <br /> a,a a-TFT-FID 107% 58-127 <br /> 4-BFB-FID 107% 55-151 <br /> 4-BFB-PID 108% 68-137 <br /> Values outside of QC limits <br /> LCS Recovery 0 out of 7 outside limits <br /> 14 <br /> I I III IIII, 'I <br /> 455 RESERVATION ROAD, SUITE G • MARINA, CA 93933 • (408) 883-0123 • FAX (408) 883-0122 <br />' recycled paper <br /> QC-LGS <br />