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Superior Precision Ana/ytica/, Inc. <br />825 Arnold Drive, Suite 114 - Martinez, California 94553 - (510) 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.: 85608 DATE RECEIVED: 04/28/92 <br />CLIENT: Kleinfelder DATE REPORTED: 04/29/92 <br />CLIENT JOB NO.: 24-220152-B00 DATE SAMPLED : 04/28/92 <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 />1 70984W <br />ND<3 <br />ND<3 <br />ND<3 <br />ND<3 <br />2 70985E <br />ND<3 <br />ND<3 <br />ND<3 <br />ND<3 <br />3 70986W <br />ND<3 <br />ND<3 <br />ND<3 <br />ND<3 <br />4 70987E <br />ND<3 <br />ND<3 <br />ND<3 <br />ND<3 <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 =100%: Duplicate RPD = <2 <br />Richard Srna, Ph.D. <br />Laboratory Dire for <br />