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oiltech Analytical Labs,Inc. 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch# GBG4980514 Date Analyzed 051I4/98 <br /> Matnx Water Quality Control Sample Blank Spice <br /> Units u <br /> PARAMETER Method# MB SA SR SP SP SPD I SPD RPDQC LMTS <br /> u u u u %R u 0/02RPD 1 %R <br /> (Benzene 1 8020 i <0 50 I 80 I ND 1 75 1 94 1 72 1 90 1 43 1 25 1 11 I I I I !I 1 f 74-11Toluene 8020 <0 50 80 ND 74 92 71 i8 <br /> ! 1[ 1i 16 iI <br /> I <br /> (Ethyl Benzene I 8020 I <0 50 1 80 E t I ND 1 74 t 92 1 71 I 89 1 38 I 1 25 1 76-116 f <br /> l 1 I 1 f I 1 I 1 I <br /> :Xylenes 1 8020 1 <0 50 1 240 t ND 1 214 1 89 1 208 I 86 1 28 1 25 1 73-121 r <br /> Gasolme I 8015 I I: <50 0 : 1000 I ND 1 1090 1 l09 1 990 1 99 1 9 6 1 I t <br /> 1 1 1 E I I 1 25 1 61-123 1 <br /> Note LCS and LCSD results reported for the following Parameters <br /> .411 <br /> 104cceptable LCS and LCSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> established 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) Splice%Recovery <br /> SPD Spike Duplicate Result <br /> SPD(%R) Spike%Recovery <br /> NC Not Calculated <br />