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Entech Analytical Labs,Inc. 525 Del Rey Avenue,Suit <br /> f� Sunnyvale,CA 94086 <br /> ' QUALITY CONTROL RESULTS SUMMARY <br /> METHOD: Gas Chromatography <br /> QC Batch#; GBG4990608 Date Analyzed: 06/08/99 <br /> Matrix: Water Quality Control Sample: Blank Spike <br /> ' Units: µg/L <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> ' µ9/L. 99/1- 9911- µg/L % R ug/L %R RPD i %R <br /> ;Benzene ; 8020 <0.50 ; 40 ; ND 39 ; 97 ; 39 ; 98 1 1.3 F 25 83-109 ; <br /> < ND 39 96 38 94 2.0 25 65-112 <br /> ,Toluene 8020 0.50 40 , <br /> ;Ethyl Benzene ; 8020 ; <0.50 ; 40 ; ND ; 38 ; 95 ; 39 97 ; 1.7 ; 25 ; 83-110 ; <br /> 'Xylenes 8020 <0.50 120 ND 114 95 116 97 2 25 83-110 <br /> l aaa-TFT(S.S)-PID 8020 103% 98% 95% 65-135 <br /> 8015 98% 90% 90% 65-135 <br /> ' Note: LCS and LCSD results reported far the following Parameters: <br /> ,411 <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(%): 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 /> r <br /> II <br />