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Superior Precision Analytical, Inc. <br /> 825 Arnold Drive Suite 1 14 • Martinez California 94553 ■ (51 O) 229 15 12 / `cx 151 0) 229-1526 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> LABORATORY NO. 83945 DATE RECEIVED 09/19/91 <br /> CLIENT. GROUNDWATER TECHNOLOGIES INC. DATE REPORTED: 09/20/91 <br /> CLIENT JOB NO 02031211 -051003 <br /> ANALYSIS FOR BENZENE , TOLUENE , ETHYL BENZENE & XYLENES <br /> by EPA SW-845 Methods 5030 and 8020 <br /> Concentration(ug/Kg) <br /> LAB Ethyl <br /> # Sample Identification Benzene Toluene Benzene Xylenes <br /> 1 TRENCH--1 ND<3 ND<3 4 19 <br /> 2 TRENCH-2 ND< 150 47000 43000 250000 <br /> ug/Kg - parts per billion (ppb) <br /> Method Detection Limit in Soil 3 ug/Kg - <br /> QAQC Summary: <br /> Daily Standard run at 20ug/L : RPD = < 15% <br /> MS/MSD Average Recovery =91 %. Duplicate RPD = <4 <br /> i <br /> Richard Srna, Ph D. <br /> i <br /> Laboratory Director <br /> Certified Laboratories <br />