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Entech Analytical Labs, Inc. 525 Del Rey Avenue,Suite E <br /> ' Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD: Gas Chromatography <br /> ' QC Batch#: GBG490805 Date Analyzed: 08/05/97 <br /> Matrix: Soil Quality Control Sample: D12315 <br /> Units: ug/kg <br /> QC LIMITS <br /> ARAMETER Method MB SA SR I SP I SP SPD SPD RPD (ADVISORY) <br /> u u u u %Ru I %R RPD i %R <br /> ' iBenzene 1 8020 1 <5.0 i 80 1 ND 1 98 1 123 i 101 i 126 1 2.5 1 25 i 50-150 i <br /> Toluene i 8020 <5.0 i <br /> i � 80 i ND � 98 � 122 � 101 i 126 i 3.4 i 25 i 50-150 � <br /> :Ethyl Benzene 8020 <5.0 80 ND 95 119 99 124 4.0 25 50-150 <br /> ' Xylenes 1 8020 1 <5.0 1 240 i ND i 287 i 119 i 298 i 124 i 3.7 25 i 50-150 <br /> Gasoline i 8015 : <1000.00 : 1000 ND 890 <br /> i i i i i 89 940 i 94 5.5 i 25 i 50-150 i <br /> ' Note: LCS and LCSD results reported for the following Parameters: <br /> None <br /> Acceptable 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(%): 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 /> 1 <br /> 1 <br />