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RECEIVED DEC 2 8 1992 <br /> Superior Precision Analyrical, Inc. <br /> 825 Arnold Drive, Suite 114 • Martinez, California 94553 • )5 10) 229-1512/fax )510) 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. : 87418 DATE RECEIVED: 12/14/92 <br /> CLIENT: Decon Environmental Services DATE REPORTED: 12/21/92 <br /> CLIENT JOB NO. : STOCKTON STEEL DATE SAMPLED : 12/11/92 <br /> ANALYSIS FOR BENZENE, TOLUENE, ETHYL BENZENE & XYLENES <br /> by EPA SW-846 Methods 5030 and 8020 <br /> Concentration (mg/kg) <br /> LAB Ethyl <br /> # Sample Identification Benzene Toluene Benzene Xylenes <br /> ---- --------------------- ------- ------- ------- ------- <br /> 1 SP-1, -2 ND<0 . 003 ND<0 . 003 ND<0 . 003 ND<0 . 003 <br /> 2 SP-3 , -4 ND<0 . 003 ND<0 . 003 ND<0 . 003 ND<0 . 003 <br /> 3 SP-5, -6 ND<0 . 003 ND<0 . 003 ND<0 . 003 ND<0 . 003 <br /> .. 4 SP-7, -8 ND<0 . 003 ND<0 . 003 ND<0 . 003 ND<0 . 003 <br /> 5 SP-9 ND<0. 003 ND<0 . 003 ND<0 . 003 ND<0 . 003 <br /> mg/kg - parts per million (ppm) <br /> Method Detection Limit in Soil : 0 . 003 mg/kg <br /> QAQC Summary: <br /> Daily Standard run at 20 ug/L: RPD = <15!s <br /> MS/MSD Average Recovery = 92k : Duplicate RPD = <1k <br /> Richard Srna, Ph.D. <br /> Laborarry Direct dr <br /> Certified laboratories <br />