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,,Entech Analytical Labs, Inc. <br /> 525 Del Rei Avenue, Sane E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch# GBG4981212 <br /> MatrixDate AnaIvzed 12/12/98 <br /> Units kb/1.Water <br /> Units Quality Control Sample Blank Spike <br /> PARAMETER Method# ' MB SA SR SP <br /> SP SPD SPD RPD QC LIMITS <br /> 7 pg/L <br /> 99/L 99/L 991L % R 9911- %R RPD i %R <br /> Benzene 8020 so <0 50 40 ND I 34 86 1 35 88 1 2 7 1 25 1 84-109 1 <br /> Toluene 8020 <0 50 40 ND 34 I 1 1 1 <br /> 'Ethyl Benzene 8020 <0 S0 1 1 1 86 36 89 3 9 : 25 84-I09 <br /> 4fl 1 ND 35 88 36 91 1 35 1 25 85-108 1 <br /> Xylenes 8020 1 c0 50 120 1 ND 1 105 1 88 1 I08 90 2 2 1 25 86-108 <br /> IGasoIme ; 8015 ; <Sfl 0 ; 500 ND ; 543 109 544 109 0 i ; 25 83-128 <br /> Note LCS and LCSD results reported for the fotlowing Parameters <br /> .411 <br /> Acceptable LCS and LCSD results are reported when matrix interferences cause,VS and MSD results to fall outside <br /> Wtablished QC limits <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 /> SPD Spike Duplicate Result <br /> SPD(%R) Spike%Recovery <br /> NC Not Calculated <br />