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Entech Analytical Labs,Inc. <br /> • 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography m <br /> QC Batch# GBG498I006 <br /> Matrix Water Date Analyzed. I0/06/98 <br /> Units u Quality Control Sample BIank Spike <br /> -------------- <br /> ARAMETER Method# MB SA SR SP SP SPD SPD RPD <br /> QC LIMITS- <br /> ub u u u % R a %R RPD [ %R <br /> [Benzene i 8020 i <0 50 i 80 [ ND i 75 i 94 i 76 i 94 i 09 t 25 i 77-115 i <br /> [Toluene I 8020 1 <0 50 i 80 f ND I 75 93 75 i 94 0 8 25 i 75-1 i5 <br /> [Ethyl Benzene i 8020 11 <0 50 i 80 ND i 74 92 74 [ 93 10 0 i 25 i 77-115 i <br /> [Xylenes [ 8020 [ <0 50 i 240 i ND i 229 i 95 i 231 ! 96 F 09 s 25 i 76-118 <br /> ,Gasoline 8015 E <50 0 : 1000 ND 970 97 990 99 20 25 65-135 <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <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 />