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' Entech Analytical Labs Inc <br /> Y _ 525 Del Rey Avenue,Suite E <br />' Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br />' METHOD Gas Chromatography <br /> QC Batch# GBG2990121 Date Analyzed 01/21/99 <br /> Matrix Soil Quality Control Sample Blank Spike <br /> Units gg/kg <br /> PARAMETER Method# ' MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> I19/kg 99/kg Pg/kg : tsglkg % R 119/1(8 %R RPD 1 %R <br /> 'Benzene 1 8020 1 <10 80 1 ND 1 81 1 101 82 1 102 1 1 1 1 25 1 81-111 I <br /> 1 1 1 1 1 1 1 1 k 1 1 1 1 <br /> ;Toluene 8020 <5 0 80 1 ND 81 I01 83 103 27 25 81-111 q <br /> 1 1 # 1 I 1 1 I 1 1 <br /> ,Ethyl Benzene 8020 <5 0 80 ND , 83 104 85 , 106 1 9 25 , 81-110 <br /> 1 , 1 1 , 1 1 1 k 1 1 , { <br /> (Xylenes 1 8020 1 <5 0 1 240 I ND 1 246 I 102 1 250 1 104 1 17 1 25 1 82-110 <br /> 1 1 1 1 1 1 1 1 i 1 1 i 1 <br /> ;Gasoline 80I5 ;<1000 00; 10001 ND 1 1030 1 103 I 1060 1 106 1 29 1 <br /> 1 1 1 25 70-125 <br /> Note LCS and LCSD results reported for the following Parameters <br /> I 1111 <br /> / 1 <br /> IAcceptable LCS and LCSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> . established QC limits <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> MB Method Blank <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(°/a) Duplicate Analysis-Relative Percent Difference <br /> SP Spike Result <br /> SP (%R) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> SPD (%R) Spike%Recovery <br /> NC Not Calculated <br /> I <br /> 1 <br /> 1 <br /> i <br />