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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# GBG2990914 Date Analvzed 09/14/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units peLiter <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD <br /> QC LIMITS <br /> pg/Liter lig/Liter pg/Liter µg/Liter % R pg/Liter %R RPD %R <br /> !Benzene 8020 1 <0 50 4 0 1 ND 3 9 98 1 4 1 103 5 0 25 67-115 <br /> ]Toluene 1 8020 <0 50 1 25 7 ND 26 102 1 28 107 4 8 25 1 82-122 <br /> Ethyl Benzene 1 8020 <0 50 5 2 ; ND 52 100 5 6 107 6 7 25 ; 77-114 <br /> 1 <br /> ;Xylenes ; 8020 ; <0 50 279 ND ; 29 ; 104 ; 31 ; 112 ; 72 25 85-125 ; <br /> ;Gasoline 8015 <50 0 500 ; ND ; 585 ; 117 589 118 ; 0 7 ; 25 75-125 <br /> aaa-TFT(SS)-P!D 1 8020 104% 99°'° 99% 65-135 <br /> 1aaa-TFT(SS)-FID 8015 111% 1030o 103% 65-135 <br /> Definition of Terms <br /> . na Not Analvzed in QC batch <br /> VI$ Method Blank <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(%) Duplicate Analysis-Relative Percent Difference <br /> SP Spike Result <br /> SP(°/oR) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> SPD(%R) Spike 4�o Reco%ery <br /> nc Not Calculated <br /> 40 <br />