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Entpeh 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#: GBG4970723 Date Analyzed: 07/23/97 <br /> Matrix: Soil -Quality Control Sample: D1 1684 <br /> Units: ug/kg <br /> QC LIMITS <br /> C PARAMETER ; Method# MB SA ° SR SP SP 5PD ' SPD RPD (ADVISORY} <br /> ug/k ug/kg ug,/kg _ ug/kg % R ug/kg %R RPD i %R <br /> iBenzene i 8020 i <5.0 1 80 i ND i 105 I 132 i 103 i 129 i 1.9 i 25 i 50-150 i <br /> iToluene 1 8020 1 <5.0 1 80 I ND .i 105 1 131 1 102 1 127 I 3.1 I 25 I 50-150 1 <br /> Ethyl Benzene i 8020 ' <5.0 I 80 I ND I 103 I 129 I 102 1 128 1 0.5 ' 25 ' 50-150 1 <br /> Xylenes 1 8020 1 <5.0 1 240 1 ND I 309 I 129 I 302 i 126 I 2.6 i 25 1 50-150 I <br /> Gasoline i 8015 i <1000.00 i 1000 i ND i 930 i 93 i 900 . 90 3.3 25 50-150 <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 /> �E <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 /> II SPD: Spike Duplicate Result <br /> SPD(%R): Spike% Recovery <br /> NC: Not Calculated <br /> E . <br /> t _ <br />