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16Entech 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#: GBG5970521 <br /> Date Analyzed: 05/21/97 <br /> Matrix.Water Quality Control Sample: Blank Spike <br /> Units: pg/L <br /> QC LIMITS <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD (ADVISORY) <br /> µg/L µg/L ug/L µg/L % R �Cg/L %R RPD i %R <br /> ' (Benzene I 8020 1 <0.5 1 25 I 0.0 1 24 1 96 1 24 1 96 1 0.0 I 25 1 50-150 <br /> Toluene 8020 <0.5 25 i 0.0 i 25 100 i 24 i 96 11 4.1 i 25 i 50-150 <br /> Ethyl Benzene 1 8020 I <0.5 f 25 I OA I 24 1 96 I 24 1 96 1 0.0 1 25 I 50-150 1 <br /> Xylenes 1 $020 1 <0.5 1 75 I 0.0 I 74 1 99 I 73 1 97 f 1.4 I 25 I 50-150 r <br /> Gasoline I 8015 1 <50.0 I I 1 I I 103 1 1 1 <br /> 1 1 I1 625 0 670 107 645 1 1 1 1 I 1 3.8 I 25 I1 50-150 I <br /> finition 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 />