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Entech Analytical Labs,Inc. 525 Del Rey avenue,Suite E <br /> Sunnyvale,Ca 94086 <br /> QUALITY CONTROL RESULTS SUV1Iv1ARY <br /> METHOD Gas Chromatography <br /> Laboratory Control Sample <br /> QC Batch# GBG1990918 Date Analyzed 08/18/99 <br /> Matnm Water Quality Control Sample Blank Spice <br /> Units pg/Liter <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> Rg/Liter µg/Liter 4g/Liter µg/Liter %R µg/Liter '/aR RPD ! °iaR <br /> Benzene 1 8024 <0 50 ! 3 6 ND 31 86 33 1 92 1 62 125 69-118 <br /> Toluene 1 8024 <0 50 ! 25 0 ND 1 25 101 26 102 12 25 ; 82-122 <br /> !Ethyl Benzene 8020 <0 50 5 0 ND 5 0 ! 100 51 102 20 25 ! 77-114 <br /> !Xylenes ! 8020 �,0 50 1 250 ND 1 27 109 28 ! 112 22 1 25 1 85-125 <br /> !Gasoline 8015 <50 0 500 ! ND 476 95 462 92 30 25 1 75-125 <br /> 1 <br /> :aac-TFT(SS)-PID i 8020 � I 890/0� 98a/o41 96%1 65-135 <br /> ! 102a/o; 1050''! 106%/ <br /> ,aaa-TFT(SS)-FID 8015 , 65-135 <br /> Deftttitton of Terms <br /> na \lot Anaivzed¢n QC batch <br /> 1v1B Method Blank <br /> S A Spike -added <br /> SR Sample Result <br /> RPD(a'a) Duplicate knalvsis-Relative Percent Difference <br /> SP Spike Resuit <br /> SP(a/oR) Spike a/a Recovery <br /> SPD Spice Duplicate Result <br /> SPD(%R) Spice`6 Recovery <br /> nc Not Calculated <br /> • <br />