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Entech Analytical Labs,Inc. 525 Del Rey Avenue,Suit <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD: Gas Chromatography <br /> QC Batch#: GBG4990324A Date Analyzed: 03/24/99 <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 µ9/L µ9/1- µ$1L % R µ9/1- %R RPD' %R <br /> ;Benzene ; 8020 1 <0.50 ; 40 1 ND ; 37 I 93 38 ; 94 ; 1.0 1 25 ; 83-109 <br /> ;Toluene 8020 <0.50 40 ND 38 94 38 96 2.0 25 79-112 <br /> ;Ethyl Benzene; 8020 ; <0.50 ; 40 ; ND ; 37 ; 94 ; 37 ; 93 ; 1.2 ; 25 ; 82-110 ; <br /> 'Xylenes 8020 ' <0.50 120 ' ND 115 1 96 ' 115 ; 96 to 0 ' 25 ; 83-110 <br /> ; ; ; ; ; ; I <br /> ;Gasoline 8015 ; <50.0 500 ND 520 104 ; 534 ; 107 ; 2.6 ; 25 ; 72-127 ; <br /> Note: LCS and LCSD results reported for 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 /> !� II <br /> i <br />