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1 tech Analytical Labs, Inc 525 Del Rey Avenue,Suite E <br /> 1 Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> 1 METHOD Gas Chromatography <br /> QC Batch# GBG4990121 Date Analyzed 01/21/99 <br /> 1 Matrix Soil Quality Control Sample Blank Spike <br /> Units 991k5 <br /> 1 PARAMETER ' Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> µglkg Jagtkg 99/kg : µg/kg % R µg/kg %R RPD I %R <br /> Benzene 8020 <5 0 80 1 ND 78 1 98 1 79 1 99 1 0 7 25 1 87-94 1 <br /> t t t t t t t t t <br /> ;Toluene 8020 <5 0 1 80 1 ND 1 79 t t 1 99 1 80 1 100 1 14 25 1 86-94 ; <br /> t t r t t t t t t t t t <br /> 1 Ethyl Benzene 1 8020 <5 0 1 80 1 ND 1 79 1 99 1 78 1 98 13 25 87-94 ; <br /> t <br /> I <br /> Xylenes 1 8020 <5 0 1 240 ND 1 240 1 100 1 237 1 99 1 1 2 1 25 1 83-99 1 <br /> t y t t t t t t t t t t t <br />' lGasoline 1 8015 1 <1000 00 1 1000 1 ND 1 920 92 930 ; 93 1 1 1 1 <br /> , , 1 i 2S 75-1 i 5 , <br /> Note LCS and LCSD results reported for the foltowing Parameters <br />' All <br />' cceptable LCS and LCSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> Wstablished QC limits <br />' Definition of Terms <br /> na Not Analyzed in QC batch <br /> 1 MB Method Blank <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(%) Duplicate Analysis-Relative Percent Difference <br /> SP Spike Result <br /> SP(%R) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> 1 SPD(%R) Spike%Recovery <br /> NC Not Calculated <br /> 1 <br /> 1 <br /> 1 <br />