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�v <br /> SUPERIOR ANALYTICAL LABORATORY, INC. <br /> 1555 BURKE. UNIT I •SAN FRANCISCO. CA 94124 • PHo-,:E (415) 647.2081 <br /> r . <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. : 51962 <br /> DATE RECEIVED: 04/24/90 <br /> �.. CLIENT: Alton Geoscience DATE REPORTED: 05/02/90 <br /> CLIENT JOB NO. : 30-140 <br /> r- ANALYSIS FOR BENZENE, TOLUEME, ETHYL BENZENE & XYLENES <br /> by EPA SW-846 Methods 5030 and 8020 <br /> Concentration(ug/kg) <br /> LAB Ethyl <br /> 0 Sample Identification Benzene Toluene Benzene Xylenes <br /> - 1 P1-4' 8 13 ND<3 19 <br /> 3 Pc-rte' ND<3 ND<3 . ND<3 ND<3 <br /> ug/kg - parts per billion (ppb) <br /> Minimum Datection' Limit in Soil : 3.0ug/kg <br /> QAQC Summary: <br /> Daily Standard run at 20ug/L: RPD = <15% <br /> MS/MSD Average Recovery = 100% Duplicate RPD = 0% <br /> Richard Srna, Ph.D. <br /> Laboratory D1 ctor <br /> OUTSTANDING QUALITY AND SERVICE <br />