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Entech Analytical Labs, Linc 525 Del Rey Avenue,Suite E <br />. Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography-Volatile Organics <br /> QC Batch# VOC2W980623 Date Analyzed 06/23/98 <br /> Matrix Water Quality Control Sample El 1682 <br /> Units <br /> PARAMETER Method## SA SR SP SP SPD SPE) RPD QC LIMITS <br /> % R L %R RPD i %R <br /> 10 25 87-109 <br /> iBenzene i 602 i 40 i ND i 40 i 99 i 40 1 100 1 <br /> 'Chlorobenzene 11601 1140 31ND 43 1 107 42 106 1114 25 i 77-120 i <br /> X1,1-Dichloroethane 1 601 11 40 i ND It 41 It 102 i 41 102 11 05 25 11 73-124 <br /> iToluene i 602 i 40 1 ND i 40 i 99 i 40 100 i 0 8 25 i 86-110 i <br /> :Trichloroethene : 601 : 40 : ND : 41 102 : 42 104 : 22 : 25 : 70-130 <br /> i <br /> Note LCS and LCSD results reported for the following Parameters <br /> None <br /> . Acceptable l CS and LCSD results are reported when matrix interferences cause liS and VSD results to fall outside <br /> established QC limits <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 />