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16 <br /> SUPERIOR ANALYTICAL LABORATORY, INC <br /> 1385 FAIRFAX ST, STE D • SAN FRANCISCO, CA 94124 • PHONE (415) 647-2081 <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. : 51398 DATE RECEIVED: 11 /22/89 <br /> CLIENT: Leedshill - Herkenhoff, Inc DATE REPORTED: 12/01 /89 <br /> CLIENT JOB NO. : 9832 . 12 <br /> ANALYSIS FOR BENZENE, TOLUENE, ETHYL BENZENE & XYLENES <br /> by EPA SW--846 Methods 5030 and 8020 <br /> Concentration(ug/kg) <br /> LAB Ethyl <br /> # Sample Identification Benzene Toluene Benzene Xylenes <br /> ----- --------------------- ------- ------- ------- ------- <br /> 3 MW4-10 ND<3 ND<3 ND<3 ND<3 <br /> 5 MW4-20 ND<3 ND<3 ND<3 ND<3 <br /> 7 MW4-30 ND<3 ND<3 ND<3 ND<3 <br /> 9 MW4-40 ND<3 ND<3 ND<3 ND<3 <br /> 11 MW4-50 ND<3 ND<3 ND<3 ND<3 <br /> 12 MW4-55 ND<3 ND<3 ND<3 ND<3 <br /> ug/kg - parts per billion (ppb ) <br /> Minimum Detection Limit in Soil : 3 . Oug/kg <br /> QAQC Summary: <br /> Daily Standard run at 20ug/L. RPD = < 15% <br /> MS/MSD Average Recovery = 103% . Duplicate RPD = 6% <br /> Richard Srna, Ph .D. <br /> Laboratory it for <br /> OUTSTANDING QUALITYAND SERVICE <br />