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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-Volatile Organics <br /> Laboratory Control Spikes <br /> QC Batch# VOC 1 W991229 Date Analyzed 12/29/99 <br /> Matrix Liquid Quality Control Sample Blank Spike <br /> Units g/L <br /> PARAMETER Method# ; SA SR SP SP SPD SPD RPD QC LIMITS <br /> L /L L % R /L %R % RPD %R <br /> Benzene 602/8020 40 ND 1 41 1 103 1 42 1 105 € 2 4 25 76-122 <br /> I t i i t t t I <br /> �Chlorobenzene 1 601/8010 ; 40 ND 42 105 44 110 4 7 25 1 77-122 I <br /> L 1-Dichloroethane 601/8010 1 40 ND 41 1 103 1 42 1 105 2 4 25 1 75-131 <br /> t <br /> ;Toluene ; 602/8020 ; 40 ; ND 36 90 1 38 1 95 ; 54 ; 25 ; 75-125 ; <br /> ;Tnchloroethene ; 601/8010 ; 40 ; ND 39 ; 98 t 40 100 ; 2 5 ; 25 ; 50-138 ; <br /> ;Bromochloromedme 601/8010 ; 1 111% ; 93% ; 92% ; ; ; 65-135 <br /> ;Fluorobenzene 602/8020 ; ; 106% ; 97% 98% 65-135 <br /> 1 ! t <br /> Definition of Terms <br /> na Not Analyzed in QC batch <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 Duplicate%Recovery <br /> NC Not Calculated <br /> • <br />