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Entech Analytical Labs, Inc. <br /> 525 Del Rey Avenue, Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUNINIARy <br /> METHOD Gas Chromatography <br /> QC Batch # GBG5971020 <br /> Matrix Water <br /> Date Analyzed 10/20/97 <br /> Units pg/L Quality Control Sample Blank Spike <br /> PARA-METER Method# MB SA SR SP SP SPD SPD RPD QC L <br /> {ADVISORYSORY <br /> ) <br /> ug/L µg/L ug/L yg/L % R µg/L %R RPD I %R <br /> ,(Benzene 1 8020 1 <0 50 1 5 0 I ND I 4 3 1 86 1 4 4 1 $8 I 2 1 1 2- 1 50-150 I <br /> Toluene 1 8020 I 1 1 1 1 t 1 <br /> I I c0 50 1 5 0 I ND 1 4 2 1 84 1 4 6 1 91 I 80 i 25 i 50-150 <br /> Ethyl Benzene i 8020 i c0 50 5 0 I ND 1 4 1 1 83 1 4 4 1 87 I 5 2 I 25 I 50-150 <br /> 1 I I I 1 I <br /> Xylenes 8020 1 <0 50 I 15 1 ND I 13 1 90 I 14 I 95 1 6 2 i 25 1 50-150 <br /> Gasoline I 8015 i <50 0 j 625 i ND i 680 109 639 102 6 2 i 25 50-150 <br /> 3 <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 A.aalysls - 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 />