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7 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> DATE RECEIVED: 09/19/91 <br /> LABORATORY NO. : 83945 DATE REPORTED: 09/20/91 <br /> CLIENT: GROUNDWATER TECHNOLOGIES INC. <br /> l CLIENT JOB NO. : 02031211-051003 <br /> ANALYSIS FOR BENZENE, TOLUENE, ETHYL BENZENE & XYLENES <br /> by EPA SW-845 Methods 5030 and 8020 <br /> i <br /> Concentration(ug/Kg) <br /> Ethyl <br /> LABBenzene Toluene Benzene Xylene <br /> # Sample Identification ------ ------- ---- ------ <br /> ---- ------- ND<3 ND<3 4 19 <br /> 1 TRENCH-1 ND<150 47000 43000 250000 <br /> 2 TRENCH-2 f. <br /> u9/Kg - parts per billion (ppb) <br /> Method Detection Limit in. Soil : 3 ug/Kg <br /> QAQC Summary: <br /> '{ Daily Standard run at 2aug/L: RPD = < 15% <br /> MS/MSD Average Recovery =91 %: Duplicate RPD = <4 <br /> Richard Srna, Ph.D. <br /> Laboratory Director <br /> Certified laboratories <br />