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AN / EN Inc <br /> Analytical & Environmental Chemistry <br />' LABORATORY CONTROL SAMPLES <br /> Method VOLATILE AROMATICS AND TPH AS GASOLINE BY OC/PID <br /> Date Agwred 03/10/98 <br /> Expressed as mass(ng) <br /> Amount Amount LCS %Rec <br /> Analyte Added Found Rec Limits <br /> Methyl-tert-butyl Ether 40 41 102% 83-123 <br />' Benzene 20 21 104% 89-111 <br /> Toluene 20 21 104% 89-113 <br /> Ethylbenzene 20 21 107% 87-113 <br />' m p-Xylenes 20 21 104% 88-118 <br /> o-Xylene 20 21 107% 86-115 <br /> TPH-Gasoline 1250 1177 94% 68-138 <br /> Surrogates LSC-8020M Batch ID 0310-04 <br /> a a a-TFT-FID 110% 58-127 <br />' 4-BFB-FED 109% 55-151 <br /> 4-BFB-PID 111% 68-137 <br /> Surrogates LSC-GASOLINE Batch 0 0310-05 <br /> a a a-TFT-FID 93% 58-127 <br /> 4-BFB-FID 108% 55-151 <br />�I 4-BFB-PID 98% 68-137 <br /> '=Values outside of OC limits <br /> LCS Recovery 0 out of 7 outside limits <br /> II <br /> 1 <br /> - <br /> i <br /> rJ I <br /> 455 RESERVATION ROAD, SUITE G • MARINA, CA 93933 • (408) 883-0123 • FAX (408) 883-0122 <br /> recycled paper <br /> QC-LCS <br />