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ntech 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 W991228 Date Analyzed 12/28/99 <br /> Matrix Liquid Quality Control Sample Blank Spike <br /> Units /L <br /> PARAMEThR Method# ; SA SR SP SP SPD SPD RPD QC LIMITS <br /> !L Egj gg/L % R L %R % RPD %R <br /> Benzene ; 602/8020 40 ND 41 103 40 100 ; 2 5 25 76-122 ; <br /> 1Chlorobenzene f 601/80I0 f 40 ND 45 113 45 1 113 0 0 25 77-122 <br /> 1 <br /> 1,1-Dichloroethane ; 601/8010 ; 40 ; ND 43 ; 108 ; 43 1 108 1 0 0 ; 25 ; 75-131 <br /> ;Toluene 602/8020 ; 40 ND 39 ; 98 ; 38 1 95 1 2 6 25 ; 75-125 ; <br /> ;Trichloroethene ; 601/8010 ; 40 ; ND 41 ; 103 ; 40 ; 100 1 2 5 ; 25 ; 50-138 ; <br /> ;Bromochloromethane ; 601/8010 ; ; 110% ; 98% 97% 1 ; ; ; 65-135 ; <br /> ;Fluorobenzene ; 602/8020 ; ; 104% 102% ; 99% 1 ; 65-135 <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> SA Spike Added <br /> I <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 /> V � <br />