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ANI EN Inc <br /> Analytical & Environmental Chemistry <br />' LABORATORY CONTROL SAMPLES <br /> Method VOLA TILE AROMA TICS AND TPH AS GASOLINE BY GC/PID <br />' Date Aqwred 03/12/98 <br /> Expressed as mass(ng) <br />' Amount Amount LCS %Rec <br /> Analyte Added Found Rec Limits <br /> Methyl-tert-butyl Ether 40 38 94% 83-123 <br /> Benzene 20 21 103% 89-111 <br /> Toluene 20 21 103% 89-113 <br /> Ethylbenzene 20 20 102% 87-113 <br />' m,p-Xylenes 20 20 100% 88-118 <br /> o-Xylene 20 21 104% 86-115 <br /> TPH-Gasoline 1250 1146 92% 68-138 <br />' Surrogates LSC-8020M Batch ID 0311-04 <br /> a,a a-TFT-FID 106% 58-127 <br /> 4-BFB-FED 106% 55-151 <br /> 4-BFB-PtD 105% 68-137 <br /> Surrogates LSC-GASOLINE Batch ID 0311-05 <br /> a,a,a•TFT-FED 83% 58-127 <br /> 4-BFB-FID 112% 55-151 — <br /> 4-BFB-PID 125% 68-137 <br /> =Values outside of QC limits <br /> LCS Recovery 0 out of 7 outside limits <br /> 455 RESERVATION ROAD, SUITE G • MARINA, CA 93933 • (408) 883-0123 • FAX (408) 883-0122 <br />' '� recycled paper <br /> QC-LCS <br />