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i <br /> r <br /> SUPERIOR ANALYTICAL LABORATORY, INC. <br /> 1555 BURKE, UNIT I - 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. : 51962 DATE RECEIVED: 04/24/90 <br /> CLIENT'- Alton Geoscience DATE REPORTED: 05/02/90 <br /> CLIENT . JOB NO. : 30-140 <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 /> 1 P1-4' 8 13 ND<3 19 <br /> 3 P2--5 ' ND<3 ND<3 ND<3 ND<3 <br /> ug/kg - parts per billion (ppb) <br /> Minimum Detection Limit in Soil : 3 .0ug/kg <br /> II QAQC Summary : <br /> Daily Standard run at 20ug/L : RPD = < 15% <br /> MS/MSD Average Recovery = 100% Duplicate RPD = <3% <br /> Richard Srna, Ph . D'. <br /> R <br /> Laboratory Di ctor <br /> • I <br /> - I <br /> OUTSTANDING QUALITY AND SERVICE <br />