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Entech analytical Labs, Inc 525 Del Rev Avenue, Suite E <br /> 4 Sunnyvale, C JL 94086 <br /> QUALITY CONTROL, RESULTS SLMNIARY <br /> METHOD Gas Chromatograpnv <br /> Laboratory Control Sample <br /> QC Batch t# WGBG2000510 Date Analvzed 05/10/00 <br /> Matrix Water Qualiry Control Sample Blank Spike <br /> Units gg/Liter <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LPv1ITS <br /> 4g/Liter ug/Liter 4g/Liter 4g/Liter % R uall-iter %R RPD °%R <br /> Benzene 1 3020 1 <0 50 1 43 ND 3 5 82 3 7 1 85 1 3 6 1 25 1 67-115 <br /> 'Toluene 8020 1 <0 50 28 0 1 ND 28 102 27 98 1 4 1 1I 25 82-122 <br /> :Ethyl Benzene 1 8020 <0 50 1 5 6 1 ND 5 7 101 1 5 5 98 3 5 25 ; 7"-114 <br /> I-Kvlenes 8020 <0 50 31 -3 ND 32 103 1 I 1 1 1 I I <br /> 1 31 98 4 9 25 85-125 <br /> ;Gasoline 8015 <50 0 434 ND 458 95 457 94 03 25 74-122 <br /> 1 1 <br /> aaa-TFT(S S)-PID 8020 101% 99% 99% 65-,35 <br /> 1aaa-TFT(SS)-F7D 8015 111% 104% 108% 65-135 <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 Analysis- Relative Percent Difference <br /> SP Spike Result <br /> SP(%R) Spike%Recovery <br /> 1 SPD Spike Daplicate Result <br /> SPD(%R) Spike%Recovery <br /> nc Not Calculated <br /> r <br />