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Entech Analytical Labs, Inc. <br /> 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 84086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> QC Batch#: GBG5970812 METHOD:Gas Chromatography <br /> Matrix: Water <br /> Units: Date Analyzed: 08i 12/97 <br /> PARAMETER Method# MB <br /> Quality Control Sample: Blank Spike <br /> ' � <br /> SA SR <br /> iBenzene µ µ SP i SP SPD SPD I QC LIMITS <br />' 1 8020 o RPD (ADVISORY) <br /> Toluene t i <0.5 25 1 8020i ND /° R ; i %R I I ) <br /> ;Ethyl Benzene 8020 1 <0.5 25 ND 1 26.3 1 105 28 5 1 109 1 25.6 i 103 i 6.1 i R25 PD i 50-1%50 <br />' Xylenes 1 8020 i <0.5 i 75 i ND i 26.2 t72 96 i 114 1 8.1 � � 1 <br /> Gasoline 11 105 28.2 113 t 7.1 i 25 1' 50-150 <br /> t 8015 i 25 50 <br /> <50.0 625 ND i -150 <br /> 632 1 101 i 609 1 97 i 3.7 25 �' 50-150 <br /> 0-150 ! <br /> I � <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 NOR): Spike%Recovery <br /> NC: Not Calculated <br />