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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 /> Laboratory Control Sample <br /> QC Batch# WGC4A000125 Date Analyzed 01/25/00 <br /> Matrix Liquid Quality Control Sample Blank Spike <br /> Units µg/Liter <br /> PARAMETER Method# MB SA SR SP SP SPD SPD % QC LIMITS <br /> gg/Liter pg/Liter }ig/Liter pg/Liter % R µg/Liter %R RPD RPD %R <br /> ;Benzene 8020 <0 50 5 6 NO 48 1 85 1 45 ; 80 63 25 70-130 <br /> ;Toluene 8020 <0 50 31 ND 28 38 29 ; 93 56 25 70-130 <br /> ;Ethyl Benzene 8020 ; <0 50 ; 6 1 NO 54 89 ; 5 6 ; 92 ; 36 ; 25 ; 70-130 <br /> Xylenes ; 8020 ; <0 50 ; 35 ; NO 31 ; 89 ; 32 ; 92 ; 34 ; 25 ; 70-130 <br /> ;Gasoline ; 8015 <50 0 ; 500 ; NO 464 93 457 91 1 16 7 25 ; 70-130 <br /> ;aaa-TFT(SS)-FfD 11 8020 120% 117% I20% 65-135 <br /> :aa a-TFT(S S)-PID 8015 111% 118% 100% 65-135 <br /> Defuution 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 />